예제 #1
0
ngx_int_t
ngx_open_listening_sockets(ngx_cycle_t *cycle)
{
    int               reuseaddr;
    ngx_uint_t        i, tries, failed;
    ngx_err_t         err;
    ngx_log_t        *log;
    ngx_socket_t      s;
    ngx_listening_t  *ls;

    reuseaddr = 1;
#if (NGX_SUPPRESS_WARN)
    failed = 0;
#endif

    log = cycle->log;

    /* TODO: configurable try number */

    for (tries = 5; tries; tries--) {
        failed = 0;

        /* for each listening socket */

        ls = cycle->listening.elts;
        for (i = 0; i < cycle->listening.nelts; i++) {

            if (ls[i].ignore) {
                continue;
            }

            if (ls[i].fd != -1) {
                continue;
            }

            if (ls[i].inherited) {

                /* TODO: close on exit */
                /* TODO: nonblocking */
                /* TODO: deferred accept */

                continue;
            }

            s = ngx_socket(ls[i].sockaddr->sa_family, ls[i].type, 0);

            if (s == -1) {
                ngx_log_error(NGX_LOG_EMERG, log, ngx_socket_errno,
                              ngx_socket_n " %V failed", &ls[i].addr_text);
                return NGX_ERROR;
            }

            if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR,
                           (const void *) &reuseaddr, sizeof(int))
                == -1)
            {
                ngx_log_error(NGX_LOG_EMERG, log, ngx_socket_errno,
                              "setsockopt(SO_REUSEADDR) %V failed",
                              &ls[i].addr_text);

                if (ngx_close_socket(s) == -1) {
                    ngx_log_error(NGX_LOG_EMERG, log, ngx_socket_errno,
                                  ngx_close_socket_n " %V failed",
                                  &ls[i].addr_text);
                }

                return NGX_ERROR;
            }

#if (NGX_HAVE_INET6 && defined IPV6_V6ONLY)

            if (ls[i].sockaddr->sa_family == AF_INET6 && ls[i].ipv6only) {
                int  ipv6only;

                ipv6only = (ls[i].ipv6only == 1);

                if (setsockopt(s, IPPROTO_IPV6, IPV6_V6ONLY,
                               (const void *) &ipv6only, sizeof(int))
                    == -1)
                {
                    ngx_log_error(NGX_LOG_EMERG, log, ngx_socket_errno,
                                  "setsockopt(IPV6_V6ONLY) %V failed, ignored",
                                  &ls[i].addr_text);
                }
            }
#endif
            /* TODO: close on exit */

            if (!(ngx_event_flags & NGX_USE_AIO_EVENT)) {
                if (ngx_nonblocking(s) == -1) {
                    ngx_log_error(NGX_LOG_EMERG, log, ngx_socket_errno,
                                  ngx_nonblocking_n " %V failed",
                                  &ls[i].addr_text);

                    if (ngx_close_socket(s) == -1) {
                        ngx_log_error(NGX_LOG_EMERG, log, ngx_socket_errno,
                                      ngx_close_socket_n " %V failed",
                                      &ls[i].addr_text);
                    }

                    return NGX_ERROR;
                }
            }

            ngx_log_debug2(NGX_LOG_DEBUG_CORE, log, 0,
                           "bind() %V #%d ", &ls[i].addr_text, s);

            if (bind(s, ls[i].sockaddr, ls[i].socklen) == -1) {
                err = ngx_socket_errno;

                if (err == NGX_EADDRINUSE && ngx_test_config) {
                    continue;
                }

                ngx_log_error(NGX_LOG_EMERG, log, err,
                              "bind() to %V failed", &ls[i].addr_text);

                if (ngx_close_socket(s) == -1) {
                    ngx_log_error(NGX_LOG_EMERG, log, ngx_socket_errno,
                                  ngx_close_socket_n " %V failed",
                                  &ls[i].addr_text);
                }

                if (err != NGX_EADDRINUSE) {
                    return NGX_ERROR;
                }

                failed = 1;

                continue;
            }

#if (NGX_HAVE_UNIX_DOMAIN)

            if (ls[i].sockaddr->sa_family == AF_UNIX) {
                mode_t   mode;
                u_char  *name;

                name = ls[i].addr_text.data + sizeof("unix:") - 1;
                mode = (S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP|S_IROTH|S_IWOTH);

                if (chmod((char *) name, mode) == -1) {
                    ngx_log_error(NGX_LOG_EMERG, cycle->log, ngx_errno,
                                  "chmod() \"%s\" failed", name);
                }

                if (ngx_test_config) {
                    if (ngx_delete_file(name) == -1) {
                        ngx_log_error(NGX_LOG_EMERG, cycle->log, ngx_errno,
                                      ngx_delete_file_n " %s failed", name);
                    }
                }
            }
#endif

            if (listen(s, ls[i].backlog) == -1) {
                ngx_log_error(NGX_LOG_EMERG, log, ngx_socket_errno,
                              "listen() to %V, backlog %d failed",
                              &ls[i].addr_text, ls[i].backlog);

                if (ngx_close_socket(s) == -1) {
                    ngx_log_error(NGX_LOG_EMERG, log, ngx_socket_errno,
                                  ngx_close_socket_n " %V failed",
                                  &ls[i].addr_text);
                }

                return NGX_ERROR;
            }

            ls[i].listen = 1;

            ls[i].fd = s;
        }

        if (!failed) {
            break;
        }

        /* TODO: delay configurable */

        ngx_log_error(NGX_LOG_NOTICE, log, 0,
                      "try again to bind() after 500ms");

        ngx_msleep(500);
    }

    if (failed) {
        ngx_log_error(NGX_LOG_EMERG, log, 0, "still could not bind()");
        return NGX_ERROR;
    }

    return NGX_OK;
}
예제 #2
0
ngx_int_t
ngx_ext_rename_file(ngx_str_t *src, ngx_str_t *to, ngx_ext_rename_file_t *ext)
{
    ngx_err_t  err;

#if !(NGX_WIN32)

    if (ext->access) {
        if (ngx_change_file_access(src->data, ext->access) == NGX_FILE_ERROR) {
            ngx_log_error(NGX_LOG_CRIT, ext->log, ngx_errno,
                          ngx_change_file_access_n " \"%s\" failed", src->data);
            err = 0;
            goto failed;
        }
    }

#endif

    if (ext->time != -1) {
        if (ngx_set_file_time(src->data, ext->fd, ext->time) != NGX_OK) {
            ngx_log_error(NGX_LOG_CRIT, ext->log, ngx_errno,
                          ngx_set_file_time_n " \"%s\" failed", src->data);
            err = 0;
            goto failed;
        }
    }

    if (ngx_rename_file(src->data, to->data) != NGX_FILE_ERROR) {
        return NGX_OK;
    }

    err = ngx_errno;

    if (err
#if (NGX_WIN32)
            == ERROR_PATH_NOT_FOUND
#else
            == NGX_ENOENT
#endif
       )
    {
        if (!ext->create_path) {
            goto failed;
        }

        err = ngx_create_full_path(to->data, ngx_dir_access(ext->path_access));

        if (err) {
            ngx_log_error(NGX_LOG_CRIT, ext->log, err,
                          ngx_create_dir_n " \"%s\" failed", to->data);
            err = 0;
            goto failed;
        }

        if (ngx_rename_file(src->data, to->data) != NGX_FILE_ERROR) {
            return NGX_OK;
        }

        err = ngx_errno;
        goto failed;
    }

#if (NGX_WIN32)

    if (err == NGX_EEXIST) {
        if (ngx_win32_rename_file(src, to, ext->log) == NGX_OK) {

            if (ngx_rename_file(src->data, to->data) != NGX_FILE_ERROR) {
                return NGX_OK;
            }

            err = ngx_errno;

        } else {
            err = 0;
        }
    }

#endif

failed:

    if (ext->delete_file) {
        if (ngx_delete_file(src->data) == NGX_FILE_ERROR) {
            ngx_log_error(NGX_LOG_CRIT, ext->log, ngx_errno,
                          ngx_delete_file_n " \"%s\" failed", src->data);
        }
    }

    if (err && ext->log_rename_error) {
        ngx_log_error(NGX_LOG_CRIT, ext->log, err,
                      ngx_rename_file_n " \"%s\" to \"%s\" failed",
                      src->data, to->data);
    }

    ext->rename_error = err;

    return NGX_ERROR;
}
예제 #3
0
파일: ngx_file.c 프로젝트: CashStar/nginx
ngx_int_t
ngx_ext_rename_file(ngx_str_t *src, ngx_str_t *to, ngx_ext_rename_file_t *ext)
{
    u_char           *name;
    ngx_err_t         err;
    ngx_copy_file_t   cf;

#if !(NGX_WIN32)

    if (ext->access) {
        if (ngx_change_file_access(src->data, ext->access) == NGX_FILE_ERROR) {
            ngx_log_error(NGX_LOG_CRIT, ext->log, ngx_errno,
                          ngx_change_file_access_n " \"%s\" failed", src->data);
            err = 0;
            goto failed;
        }
    }

#endif

    if (ext->time != -1) {
        if (ngx_set_file_time(src->data, ext->fd, ext->time) != NGX_OK) {
            ngx_log_error(NGX_LOG_CRIT, ext->log, ngx_errno,
                          ngx_set_file_time_n " \"%s\" failed", src->data);
            err = 0;
            goto failed;
        }
    }

    if (ngx_rename_file(src->data, to->data) != NGX_FILE_ERROR) {
        return NGX_OK;
    }

    err = ngx_errno;

    if (err == NGX_ENOPATH) {

        if (!ext->create_path) {
            goto failed;
        }

        err = ngx_create_full_path(to->data, ngx_dir_access(ext->path_access));

        if (err) {
            ngx_log_error(NGX_LOG_CRIT, ext->log, err,
                          ngx_create_dir_n " \"%s\" failed", to->data);
            err = 0;
            goto failed;
        }

        if (ngx_rename_file(src->data, to->data) != NGX_FILE_ERROR) {
            return NGX_OK;
        }

        err = ngx_errno;
    }

#if (NGX_WIN32)

    if (err == NGX_EEXIST) {
        err = ngx_win32_rename_file(src, to, ext->log);

        if (err == 0) {
            return NGX_OK;
        }
    }

#endif

    if (err == NGX_EXDEV) {

        cf.size = -1;
        cf.buf_size = 0;
        cf.access = ext->access;
        cf.time = ext->time;
        cf.log = ext->log;

        name = ngx_alloc(to->len + 1 + 10 + 1, ext->log);
        if (name == NULL) {
            return NGX_ERROR;
        }

        (void) ngx_sprintf(name, "%*s.%010uD%Z", to->len, to->data,
                           (uint32_t) ngx_next_temp_number(0));

        if (ngx_copy_file(src->data, name, &cf) == NGX_OK) {

            if (ngx_rename_file(name, to->data) != NGX_FILE_ERROR) {
                ngx_free(name);

                if (ngx_delete_file(src->data) == NGX_FILE_ERROR) {
                    ngx_log_error(NGX_LOG_CRIT, ext->log, ngx_errno,
                                  ngx_delete_file_n " \"%s\" failed",
                                  src->data);
                    return NGX_ERROR;
                }

                return NGX_OK;
            }

            ngx_log_error(NGX_LOG_CRIT, ext->log, ngx_errno,
                          ngx_rename_file_n " \"%s\" to \"%s\" failed",
                          name, to->data);

            if (ngx_delete_file(name) == NGX_FILE_ERROR) {
                ngx_log_error(NGX_LOG_CRIT, ext->log, ngx_errno,
                              ngx_delete_file_n " \"%s\" failed", name);

            }
        }

        ngx_free(name);

        err = 0;
    }

failed:

    if (ext->delete_file) {
        if (ngx_delete_file(src->data) == NGX_FILE_ERROR) {
            ngx_log_error(NGX_LOG_CRIT, ext->log, ngx_errno,
                          ngx_delete_file_n " \"%s\" failed", src->data);
        }
    }

    if (err) {
        ngx_log_error(NGX_LOG_CRIT, ext->log, err,
                      ngx_rename_file_n " \"%s\" to \"%s\" failed",
                      src->data, to->data);
    }

    return NGX_ERROR;
}
static int
ngx_http_lua_ngx_req_set_body_file(lua_State *L)
{
    u_char                      *p;
    ngx_http_request_t          *r;
    int                          n;
    ngx_http_request_body_t     *rb;
    ngx_temp_file_t             *tf;
    ngx_buf_t                   *b;
    ngx_str_t                    name;
    ngx_int_t                    rc;
    int                          clean;
    ngx_open_file_info_t         of;
    ngx_str_t                    key, value;
    ngx_pool_cleanup_t          *cln;
    ngx_pool_cleanup_file_t     *clnf;
    ngx_err_t                    err;
    ngx_chain_t                 *cl;
    ngx_buf_tag_t                tag;

    n = lua_gettop(L);

    if (n != 1 && n != 2) {
        return luaL_error(L, "expecting 1 or 2 arguments but seen %d", n);
    }

    p = (u_char *) luaL_checklstring(L, 1, &name.len);

    r = ngx_http_lua_get_req(L);
    if (r == NULL) {
        return luaL_error(L, "no request found");
    }

    ngx_http_lua_check_fake_request(L, r);

    if (r->discard_body) {
        return luaL_error(L, "request body already discarded asynchronously");
    }

    if (r->request_body == NULL) {
        return luaL_error(L, "request body not read yet");
    }

    name.data = ngx_palloc(r->pool, name.len + 1);
    if (name.data == NULL) {
        return luaL_error(L, "no memory");
    }

    ngx_memcpy(name.data, p, name.len);
    name.data[name.len] = '\0';

    if (n == 2) {
        luaL_checktype(L, 2, LUA_TBOOLEAN);
        clean = lua_toboolean(L, 2);

    } else {
        clean = 0;
    }

    dd("clean: %d", (int) clean);

    rb = r->request_body;

    /* clean up existing r->request_body->bufs (if any) */

    tag = (ngx_buf_tag_t) &ngx_http_lua_module;

    if (rb->bufs) {
        dd("XXX reusing buf");

        for (cl = rb->bufs; cl; cl = cl->next) {
            if (cl->buf->tag == tag && cl->buf->temporary) {
                dd("free old request body buffer: size:%d",
                   (int) ngx_buf_size(cl->buf));

                ngx_pfree(r->pool, cl->buf->start);
                cl->buf->tag = (ngx_buf_tag_t) NULL;
                cl->buf->temporary = 0;
            }
        }

        rb->bufs->next = NULL;
        b = rb->bufs->buf;

        ngx_memzero(b, sizeof(ngx_buf_t));

        b->tag = tag;
        rb->buf = NULL;

    } else {

        dd("XXX creating new buf");

        rb->bufs = ngx_alloc_chain_link(r->pool);
        if (rb->bufs == NULL) {
            return luaL_error(L, "no memory");
        }
        rb->bufs->next = NULL;

        b = ngx_calloc_buf(r->pool);
        if (b == NULL) {
            return luaL_error(L, "no memory");
        }

        b->tag = tag;

        rb->bufs->buf = b;
        rb->buf = NULL;
    }

    b->last_in_chain = 1;

    /* just make r->request_body->temp_file a bare stub */

    tf = rb->temp_file;

    if (tf) {
        if (tf->file.fd != NGX_INVALID_FILE) {

            dd("cleaning temp file %.*s", (int) tf->file.name.len,
               tf->file.name.data);

            ngx_http_lua_pool_cleanup_file(r->pool, tf->file.fd);

            ngx_memzero(tf, sizeof(ngx_temp_file_t));

            tf->file.fd = NGX_INVALID_FILE;

            dd("temp file cleaned: %.*s", (int) tf->file.name.len,
               tf->file.name.data);
        }

    } else {

        tf = ngx_pcalloc(r->pool, sizeof(ngx_temp_file_t));
        if (tf == NULL) {
            return luaL_error(L, "no memory");
        }

        tf->file.fd = NGX_INVALID_FILE;
        rb->temp_file = tf;
    }

    /* read the file info and construct an in-file buf */

    ngx_memzero(&of, sizeof(ngx_open_file_info_t));

    of.directio = NGX_OPEN_FILE_DIRECTIO_OFF;

    if (ngx_http_lua_open_and_stat_file(name.data, &of, r->connection->log)
        != NGX_OK)
    {
        return luaL_error(L, "%s \"%s\" failed", of.failed, name.data);
    }

    dd("XXX new body file fd: %d", of.fd);

    tf->file.fd = of.fd;
    tf->file.name = name;
    tf->file.log = r->connection->log;
    tf->file.directio = 0;

    if (of.size == 0) {
        if (clean) {
            if (ngx_delete_file(name.data) == NGX_FILE_ERROR) {
                err = ngx_errno;

                if (err != NGX_ENOENT) {
                    ngx_log_error(NGX_LOG_CRIT, r->connection->log, err,
                                  ngx_delete_file_n " \"%s\" failed",
                                  name.data);
                }
            }
        }

        if (ngx_close_file(of.fd) == NGX_FILE_ERROR) {
            ngx_log_error(NGX_LOG_ALERT, r->connection->log, ngx_errno,
                          ngx_close_file_n " \"%s\" failed", name.data);
        }

        r->request_body->bufs = NULL;
        r->request_body->buf = NULL;

        goto set_header;
    }

    /* register file cleanup hook */

    cln = ngx_pool_cleanup_add(r->pool,
                               sizeof(ngx_pool_cleanup_file_t));

    if (cln == NULL) {
        return luaL_error(L, "no memory");
    }

    cln->handler = clean ? ngx_pool_delete_file : ngx_pool_cleanup_file;
    clnf = cln->data;

    clnf->fd = of.fd;
    clnf->name = name.data;
    clnf->log = r->pool->log;

    b->file = &tf->file;
    if (b->file == NULL) {
        return NGX_HTTP_INTERNAL_SERVER_ERROR;
    }

    dd("XXX file size: %d", (int) of.size);

    b->file_pos = 0;
    b->file_last = of.size;

    b->in_file = 1;

    dd("buf file: %p, f:%u", b->file, b->in_file);

set_header:

    /* override input header Content-Length (value must be null terminated) */

    value.data = ngx_palloc(r->pool, NGX_OFF_T_LEN + 1);
    if (value.data == NULL) {
        return luaL_error(L, "no memory");
    }

    value.len = ngx_sprintf(value.data, "%O", of.size) - value.data;
    value.data[value.len] = '\0';

    r->headers_in.content_length_n = of.size;

    if (r->headers_in.content_length) {
        r->headers_in.content_length->value.data = value.data;
        r->headers_in.content_length->value.len = value.len;

    } else {

        ngx_str_set(&key, "Content-Length");

        rc = ngx_http_lua_set_input_header(r, key, value, 1 /* override */);
        if (rc != NGX_OK) {
            return luaL_error(L, "failed to reset the Content-Length "
                              "input header");
        }
    }

    return 0;
}
예제 #5
0
void
ngx_close_listening_sockets(ngx_cycle_t *cycle)
{
    ngx_uint_t         i;
    ngx_listening_t   *ls;
    ngx_connection_t  *c;

    if (ngx_event_flags & NGX_USE_IOCP_EVENT) {
        return;
    }

    ngx_accept_mutex_held = 0;
    ngx_use_accept_mutex = 0;

    ls = cycle->listening.elts;
    for (i = 0; i < cycle->listening.nelts; i++) {

        c = ls[i].connection;

        if (c) {
            if (c->read->active) {
                if (ngx_event_flags & NGX_USE_RTSIG_EVENT) {
                    ngx_del_conn(c, NGX_CLOSE_EVENT);

                } else if (ngx_event_flags & NGX_USE_EPOLL_EVENT) {

                    /*
                     * it seems that Linux-2.6.x OpenVZ sends events
                     * for closed shared listening sockets unless
                     * the events was explicity deleted
                     */

                    ngx_del_event(c->read, NGX_READ_EVENT, 0);

                } else {
                    ngx_del_event(c->read, NGX_READ_EVENT, NGX_CLOSE_EVENT);
                }
            }

            ngx_free_connection(c);

            c->fd = (ngx_socket_t) -1;
        }

        ngx_log_debug2(NGX_LOG_DEBUG_CORE, cycle->log, 0,
                       "close listening %V #%d ", &ls[i].addr_text, ls[i].fd);

        if (ngx_close_socket(ls[i].fd) == -1) {
            ngx_log_error(NGX_LOG_EMERG, cycle->log, ngx_socket_errno,
                          ngx_close_socket_n " %V failed", &ls[i].addr_text);
        }

#if (NGX_HAVE_UNIX_DOMAIN)

        if (ls[i].sockaddr->sa_family == AF_UNIX
            && ngx_process <= NGX_PROCESS_MASTER
            && ngx_new_binary == 0)
        {
            u_char *name = ls[i].addr_text.data + sizeof("unix:") - 1;

            if (ngx_delete_file(name) == -1) {
                ngx_log_error(NGX_LOG_EMERG, cycle->log, ngx_socket_errno,
                              ngx_delete_file_n " %s failed", name);
            }
        }

#endif

        ls[i].fd = (ngx_socket_t) -1;
    }
}
ngx_cycle_t *
ngx_init_cycle(ngx_cycle_t *old_cycle)
{
    void                *rv;
    char               **senv, **env;
    ngx_uint_t           i, n;
    ngx_log_t           *log;
    ngx_time_t          *tp;
    ngx_conf_t           conf;
    ngx_pool_t          *pool;
    ngx_cycle_t         *cycle, **old;
    ngx_shm_zone_t      *shm_zone, *oshm_zone;
    ngx_list_part_t     *part, *opart;
    ngx_open_file_t     *file;
    ngx_listening_t     *ls, *nls;
    ngx_core_conf_t     *ccf, *old_ccf;
    ngx_core_module_t   *module;
    char                 hostname[NGX_MAXHOSTNAMELEN];

    ngx_timezone_update();

    /* force localtime update with a new timezone */

    tp = ngx_timeofday();
    tp->sec = 0;

    ngx_time_update();


    log = old_cycle->log;

    pool = ngx_create_pool(NGX_CYCLE_POOL_SIZE, log);
    if (pool == NULL) {
        return NULL;
    }
    pool->log = log;

    cycle = ngx_pcalloc(pool, sizeof(ngx_cycle_t));
    if (cycle == NULL) {
        ngx_destroy_pool(pool);
        return NULL;
    }

    cycle->pool = pool;
    cycle->log = log;
    cycle->old_cycle = old_cycle;

    cycle->conf_prefix.len = old_cycle->conf_prefix.len;
    cycle->conf_prefix.data = ngx_pstrdup(pool, &old_cycle->conf_prefix);
    if (cycle->conf_prefix.data == NULL) {
        ngx_destroy_pool(pool);
        return NULL;
    }

    cycle->prefix.len = old_cycle->prefix.len;
    cycle->prefix.data = ngx_pstrdup(pool, &old_cycle->prefix);
    if (cycle->prefix.data == NULL) {
        ngx_destroy_pool(pool);
        return NULL;
    }

    cycle->conf_file.len = old_cycle->conf_file.len;
    cycle->conf_file.data = ngx_pnalloc(pool, old_cycle->conf_file.len + 1);
    if (cycle->conf_file.data == NULL) {
        ngx_destroy_pool(pool);
        return NULL;
    }
    ngx_cpystrn(cycle->conf_file.data, old_cycle->conf_file.data,
                old_cycle->conf_file.len + 1);

    cycle->conf_param.len = old_cycle->conf_param.len;
    cycle->conf_param.data = ngx_pstrdup(pool, &old_cycle->conf_param);
    if (cycle->conf_param.data == NULL) {
        ngx_destroy_pool(pool);
        return NULL;
    }


    n = old_cycle->paths.nelts ? old_cycle->paths.nelts : 10;

    cycle->paths.elts = ngx_pcalloc(pool, n * sizeof(ngx_path_t *));
    if (cycle->paths.elts == NULL) {
        ngx_destroy_pool(pool);
        return NULL;
    }

    cycle->paths.nelts = 0;
    cycle->paths.size = sizeof(ngx_path_t *);
    cycle->paths.nalloc = n;
    cycle->paths.pool = pool;


    if (old_cycle->open_files.part.nelts) {
        n = old_cycle->open_files.part.nelts;
        for (part = old_cycle->open_files.part.next; part; part = part->next) {
            n += part->nelts;
        }

    } else {
        n = 20;
    }

    if (ngx_list_init(&cycle->open_files, pool, n, sizeof(ngx_open_file_t))
            != NGX_OK)
    {
        ngx_destroy_pool(pool);
        return NULL;
    }


    if (old_cycle->shared_memory.part.nelts) {
        n = old_cycle->shared_memory.part.nelts;
        for (part = old_cycle->shared_memory.part.next; part; part = part->next)
        {
            n += part->nelts;
        }

    } else {
        n = 1;
    }

    if (ngx_list_init(&cycle->shared_memory, pool, n, sizeof(ngx_shm_zone_t))
            != NGX_OK)
    {
        ngx_destroy_pool(pool);
        return NULL;
    }

    n = old_cycle->listening.nelts ? old_cycle->listening.nelts : 10;

    cycle->listening.elts = ngx_pcalloc(pool, n * sizeof(ngx_listening_t));
    if (cycle->listening.elts == NULL) {
        ngx_destroy_pool(pool);
        return NULL;
    }

    cycle->listening.nelts = 0;
    cycle->listening.size = sizeof(ngx_listening_t);
    cycle->listening.nalloc = n;
    cycle->listening.pool = pool;


    ngx_queue_init(&cycle->reusable_connections_queue);


    cycle->conf_ctx = ngx_pcalloc(pool, ngx_max_module * sizeof(void *));
    if (cycle->conf_ctx == NULL) {
        ngx_destroy_pool(pool);
        return NULL;
    }


    if (gethostname(hostname, NGX_MAXHOSTNAMELEN) == -1) {
        ngx_log_error(NGX_LOG_EMERG, log, ngx_errno, "gethostname() failed");
        ngx_destroy_pool(pool);
        return NULL;
    }

    /* on Linux gethostname() silently truncates name that does not fit */

    hostname[NGX_MAXHOSTNAMELEN - 1] = '\0';
    cycle->hostname.len = ngx_strlen(hostname);

    cycle->hostname.data = ngx_pnalloc(pool, cycle->hostname.len);
    if (cycle->hostname.data == NULL) {
        ngx_destroy_pool(pool);
        return NULL;
    }

    ngx_strlow(cycle->hostname.data, (u_char *) hostname, cycle->hostname.len);


    for (i = 0; ngx_modules[i]; i++) {
        if (ngx_modules[i]->type != NGX_CORE_MODULE) {
            continue;
        }

        module = ngx_modules[i]->ctx;

        if (module->create_conf) {
            rv = module->create_conf(cycle);
            if (rv == NULL) {
                ngx_destroy_pool(pool);
                return NULL;
            }
            cycle->conf_ctx[ngx_modules[i]->index] = rv;
        }
    }


    senv = environ;


    ngx_memzero(&conf, sizeof(ngx_conf_t));
    /* STUB: init array ? */
    conf.args = ngx_array_create(pool, 10, sizeof(ngx_str_t));
    if (conf.args == NULL) {
        ngx_destroy_pool(pool);
        return NULL;
    }

    conf.temp_pool = ngx_create_pool(NGX_CYCLE_POOL_SIZE, log);
    if (conf.temp_pool == NULL) {
        ngx_destroy_pool(pool);
        return NULL;
    }


    conf.ctx = cycle->conf_ctx;
    conf.cycle = cycle;
    conf.pool = pool;
    conf.log = log;
    conf.module_type = NGX_CORE_MODULE;
    conf.cmd_type = NGX_MAIN_CONF;

#if 0
    log->log_level = NGX_LOG_DEBUG_ALL;
#endif

    if (ngx_conf_param(&conf) != NGX_CONF_OK) {
        environ = senv;
        ngx_destroy_cycle_pools(&conf);
        return NULL;
    }

    if (ngx_conf_parse(&conf, &cycle->conf_file) != NGX_CONF_OK) {
        environ = senv;
        ngx_destroy_cycle_pools(&conf);
        return NULL;
    }

    if (ngx_test_config && !ngx_quiet_mode) {
        ngx_log_stderr(0, "the configuration file %s syntax is ok",
                       cycle->conf_file.data);
    }

    for (i = 0; ngx_modules[i]; i++) {
        if (ngx_modules[i]->type != NGX_CORE_MODULE) {
            continue;
        }

        module = ngx_modules[i]->ctx;

        if (module->init_conf) {
            if (module->init_conf(cycle, cycle->conf_ctx[ngx_modules[i]->index])
                    == NGX_CONF_ERROR)
            {
                environ = senv;
                ngx_destroy_cycle_pools(&conf);
                return NULL;
            }
        }
    }

    if (ngx_process == NGX_PROCESS_SIGNALLER) {
        return cycle;
    }

    ccf = (ngx_core_conf_t *) ngx_get_conf(cycle->conf_ctx, ngx_core_module);

    if (ngx_test_config) {

        if (ngx_create_pidfile(&ccf->pid, log) != NGX_OK) {
            goto failed;
        }

    } else if (!ngx_is_init_cycle(old_cycle)) {

        /*
         * we do not create the pid file in the first ngx_init_cycle() call
         * because we need to write the demonized process pid
         */

        old_ccf = (ngx_core_conf_t *) ngx_get_conf(old_cycle->conf_ctx,
                  ngx_core_module);
        if (ccf->pid.len != old_ccf->pid.len
                || ngx_strcmp(ccf->pid.data, old_ccf->pid.data) != 0)
        {
            /* new pid file name */

            if (ngx_create_pidfile(&ccf->pid, log) != NGX_OK) {
                goto failed;
            }

            ngx_delete_pidfile(old_cycle);
        }
    }


    if (ngx_test_lockfile(cycle->lock_file.data, log) != NGX_OK) {
        goto failed;
    }


    if (ngx_create_paths(cycle, ccf->user) != NGX_OK) {
        goto failed;
    }


    if (ngx_log_open_default(cycle) != NGX_OK) {
        goto failed;
    }

    /* open the new files */

    part = &cycle->open_files.part;
    file = part->elts;

    for (i = 0; /* void */ ; i++) {

        if (i >= part->nelts) {
            if (part->next == NULL) {
                break;
            }
            part = part->next;
            file = part->elts;
            i = 0;
        }

        if (file[i].name.len == 0) {
            continue;
        }

        file[i].fd = ngx_open_file(file[i].name.data,
                                   NGX_FILE_APPEND,
                                   NGX_FILE_CREATE_OR_OPEN,
                                   NGX_FILE_DEFAULT_ACCESS);

        ngx_log_debug3(NGX_LOG_DEBUG_CORE, log, 0,
                       "log: %p %d \"%s\"",
                       &file[i], file[i].fd, file[i].name.data);

        if (file[i].fd == NGX_INVALID_FILE) {
            ngx_log_error(NGX_LOG_EMERG, log, ngx_errno,
                          ngx_open_file_n " \"%s\" failed",
                          file[i].name.data);
            goto failed;
        }

#if !(NGX_WIN32)
        if (fcntl(file[i].fd, F_SETFD, FD_CLOEXEC) == -1) {
            ngx_log_error(NGX_LOG_EMERG, log, ngx_errno,
                          "fcntl(FD_CLOEXEC) \"%s\" failed",
                          file[i].name.data);
            goto failed;
        }
#endif
    }

    cycle->log = &cycle->new_log;
    pool->log = &cycle->new_log;


    /* create shared memory */

    part = &cycle->shared_memory.part;
    shm_zone = part->elts;

    for (i = 0; /* void */ ; i++) {

        if (i >= part->nelts) {
            if (part->next == NULL) {
                break;
            }
            part = part->next;
            shm_zone = part->elts;
            i = 0;
        }

        if (shm_zone[i].shm.size == 0) {
            ngx_log_error(NGX_LOG_EMERG, log, 0,
                          "zero size shared memory zone \"%V\"",
                          &shm_zone[i].shm.name);
            goto failed;
        }

        shm_zone[i].shm.log = cycle->log;

        opart = &old_cycle->shared_memory.part;
        oshm_zone = opart->elts;

        for (n = 0; /* void */ ; n++) {

            if (n >= opart->nelts) {
                if (opart->next == NULL) {
                    break;
                }
                opart = opart->next;
                oshm_zone = opart->elts;
                n = 0;
            }

            if (shm_zone[i].shm.name.len != oshm_zone[n].shm.name.len) {
                continue;
            }

            if (ngx_strncmp(shm_zone[i].shm.name.data,
                            oshm_zone[n].shm.name.data,
                            shm_zone[i].shm.name.len)
                    != 0)
            {
                continue;
            }

            if (shm_zone[i].tag == oshm_zone[n].tag
                    && shm_zone[i].shm.size == oshm_zone[n].shm.size)
            {
                shm_zone[i].shm.addr = oshm_zone[n].shm.addr;

                if (shm_zone[i].init(&shm_zone[i], oshm_zone[n].data)
                        != NGX_OK)
                {
                    goto failed;
                }

                goto shm_zone_found;
            }

            ngx_shm_free(&oshm_zone[n].shm);

            break;
        }

        if (ngx_shm_alloc(&shm_zone[i].shm) != NGX_OK) {
            goto failed;
        }

        if (ngx_init_zone_pool(cycle, &shm_zone[i]) != NGX_OK) {
            goto failed;
        }

        if (shm_zone[i].init(&shm_zone[i], NULL) != NGX_OK) {
            goto failed;
        }

shm_zone_found:

        continue;
    }


    /* handle the listening sockets */

    if (old_cycle->listening.nelts) {
        ls = old_cycle->listening.elts;
        for (i = 0; i < old_cycle->listening.nelts; i++) {
            ls[i].remain = 0;
        }

        nls = cycle->listening.elts;
        for (n = 0; n < cycle->listening.nelts; n++) {

            for (i = 0; i < old_cycle->listening.nelts; i++) {
                if (ls[i].ignore) {
                    continue;
                }

                if (ngx_cmp_sockaddr(nls[n].sockaddr, nls[n].socklen,
                                     ls[i].sockaddr, ls[i].socklen, 1)
                        == NGX_OK)
                {
                    nls[n].fd = ls[i].fd;
                    nls[n].previous = &ls[i];
                    ls[i].remain = 1;

                    if (ls[i].backlog != nls[n].backlog) {
                        nls[n].listen = 1;
                    }

#if (NGX_HAVE_DEFERRED_ACCEPT && defined SO_ACCEPTFILTER)

                    /*
                     * FreeBSD, except the most recent versions,
                     * could not remove accept filter
                     */
                    nls[n].deferred_accept = ls[i].deferred_accept;

                    if (ls[i].accept_filter && nls[n].accept_filter) {
                        if (ngx_strcmp(ls[i].accept_filter,
                                       nls[n].accept_filter)
                                != 0)
                        {
                            nls[n].delete_deferred = 1;
                            nls[n].add_deferred = 1;
                        }

                    } else if (ls[i].accept_filter) {
                        nls[n].delete_deferred = 1;

                    } else if (nls[n].accept_filter) {
                        nls[n].add_deferred = 1;
                    }
#endif

#if (NGX_HAVE_DEFERRED_ACCEPT && defined TCP_DEFER_ACCEPT)

                    if (ls[i].deferred_accept && !nls[n].deferred_accept) {
                        nls[n].delete_deferred = 1;

                    } else if (ls[i].deferred_accept != nls[n].deferred_accept)
                    {
                        nls[n].add_deferred = 1;
                    }
#endif
                    break;
                }
            }

            if (nls[n].fd == (ngx_socket_t) -1) {
                nls[n].open = 1;
#if (NGX_HAVE_DEFERRED_ACCEPT && defined SO_ACCEPTFILTER)
                if (nls[n].accept_filter) {
                    nls[n].add_deferred = 1;
                }
#endif
#if (NGX_HAVE_DEFERRED_ACCEPT && defined TCP_DEFER_ACCEPT)
                if (nls[n].deferred_accept) {
                    nls[n].add_deferred = 1;
                }
#endif
            }
        }

    } else {
        ls = cycle->listening.elts;
        for (i = 0; i < cycle->listening.nelts; i++) {
            ls[i].open = 1;
#if (NGX_HAVE_DEFERRED_ACCEPT && defined SO_ACCEPTFILTER)
            if (ls[i].accept_filter) {
                ls[i].add_deferred = 1;
            }
#endif
#if (NGX_HAVE_DEFERRED_ACCEPT && defined TCP_DEFER_ACCEPT)
            if (ls[i].deferred_accept) {
                ls[i].add_deferred = 1;
            }
#endif
        }
    }

    if (ngx_open_listening_sockets(cycle) != NGX_OK) {
        goto failed;
    }

    if (!ngx_test_config) {
        ngx_configure_listening_sockets(cycle);
    }


    /* commit the new cycle configuration */

    if (!ngx_use_stderr) {
        (void) ngx_log_redirect_stderr(cycle);
    }

    pool->log = cycle->log;

    for (i = 0; ngx_modules[i]; i++) {
        if (ngx_modules[i]->init_module) {
            if (ngx_modules[i]->init_module(cycle) != NGX_OK) {
                /* fatal */
                exit(1);
            }
        }
    }


    /* close and delete stuff that lefts from an old cycle */

    /* free the unnecessary shared memory */

    opart = &old_cycle->shared_memory.part;
    oshm_zone = opart->elts;

    for (i = 0; /* void */ ; i++) {

        if (i >= opart->nelts) {
            if (opart->next == NULL) {
                goto old_shm_zone_done;
            }
            opart = opart->next;
            oshm_zone = opart->elts;
            i = 0;
        }

        part = &cycle->shared_memory.part;
        shm_zone = part->elts;

        for (n = 0; /* void */ ; n++) {

            if (n >= part->nelts) {
                if (part->next == NULL) {
                    break;
                }
                part = part->next;
                shm_zone = part->elts;
                n = 0;
            }

            if (oshm_zone[i].shm.name.len == shm_zone[n].shm.name.len
                    && ngx_strncmp(oshm_zone[i].shm.name.data,
                                   shm_zone[n].shm.name.data,
                                   oshm_zone[i].shm.name.len)
                    == 0)
            {
                goto live_shm_zone;
            }
        }

        ngx_shm_free(&oshm_zone[i].shm);

live_shm_zone:

        continue;
    }

old_shm_zone_done:


    /* close the unnecessary listening sockets */

    ls = old_cycle->listening.elts;
    for (i = 0; i < old_cycle->listening.nelts; i++) {

        if (ls[i].remain || ls[i].fd == (ngx_socket_t) -1) {
            continue;
        }

        if (ngx_close_socket(ls[i].fd) == -1) {
            ngx_log_error(NGX_LOG_EMERG, log, ngx_socket_errno,
                          ngx_close_socket_n " listening socket on %V failed",
                          &ls[i].addr_text);
        }

#if (NGX_HAVE_UNIX_DOMAIN)

        if (ls[i].sockaddr->sa_family == AF_UNIX) {
            u_char  *name;

            name = ls[i].addr_text.data + sizeof("unix:") - 1;

            ngx_log_error(NGX_LOG_WARN, cycle->log, 0,
                          "deleting socket %s", name);

            if (ngx_delete_file(name) == NGX_FILE_ERROR) {
                ngx_log_error(NGX_LOG_EMERG, cycle->log, ngx_socket_errno,
                              ngx_delete_file_n " %s failed", name);
            }
        }

#endif
    }


    /* close the unnecessary open files */

    part = &old_cycle->open_files.part;
    file = part->elts;

    for (i = 0; /* void */ ; i++) {

        if (i >= part->nelts) {
            if (part->next == NULL) {
                break;
            }
            part = part->next;
            file = part->elts;
            i = 0;
        }

        if (file[i].fd == NGX_INVALID_FILE || file[i].fd == ngx_stderr) {
            continue;
        }

        if (ngx_close_file(file[i].fd) == NGX_FILE_ERROR) {
            ngx_log_error(NGX_LOG_EMERG, log, ngx_errno,
                          ngx_close_file_n " \"%s\" failed",
                          file[i].name.data);
        }
    }

    ngx_destroy_pool(conf.temp_pool);

    if (ngx_process == NGX_PROCESS_MASTER || ngx_is_init_cycle(old_cycle)) {

        /*
         * perl_destruct() frees environ, if it is not the same as it was at
         * perl_construct() time, therefore we save the previous cycle
         * environment before ngx_conf_parse() where it will be changed.
         */

        env = environ;
        environ = senv;

        ngx_destroy_pool(old_cycle->pool);
        cycle->old_cycle = NULL;

        environ = env;

        return cycle;
    }


    if (ngx_temp_pool == NULL) {
        ngx_temp_pool = ngx_create_pool(128, cycle->log);
        if (ngx_temp_pool == NULL) {
            ngx_log_error(NGX_LOG_EMERG, cycle->log, 0,
                          "could not create ngx_temp_pool");
            exit(1);
        }

        n = 10;
        ngx_old_cycles.elts = ngx_pcalloc(ngx_temp_pool,
                                          n * sizeof(ngx_cycle_t *));
        if (ngx_old_cycles.elts == NULL) {
            exit(1);
        }
        ngx_old_cycles.nelts = 0;
        ngx_old_cycles.size = sizeof(ngx_cycle_t *);
        ngx_old_cycles.nalloc = n;
        ngx_old_cycles.pool = ngx_temp_pool;

        ngx_cleaner_event.handler = ngx_clean_old_cycles;
        ngx_cleaner_event.log = cycle->log;
        ngx_cleaner_event.data = &dumb;
        dumb.fd = (ngx_socket_t) -1;
    }

    ngx_temp_pool->log = cycle->log;

    old = ngx_array_push(&ngx_old_cycles);
    if (old == NULL) {
        exit(1);
    }
    *old = old_cycle;

    if (!ngx_cleaner_event.timer_set) {
        ngx_add_timer(&ngx_cleaner_event, 30000);
        ngx_cleaner_event.timer_set = 1;
    }

    return cycle;


failed:

    if (!ngx_is_init_cycle(old_cycle)) {
        old_ccf = (ngx_core_conf_t *) ngx_get_conf(old_cycle->conf_ctx,
                  ngx_core_module);
        if (old_ccf->environment) {
            environ = old_ccf->environment;
        }
    }

    /* rollback the new cycle configuration */

    part = &cycle->open_files.part;
    file = part->elts;

    for (i = 0; /* void */ ; i++) {

        if (i >= part->nelts) {
            if (part->next == NULL) {
                break;
            }
            part = part->next;
            file = part->elts;
            i = 0;
        }

        if (file[i].fd == NGX_INVALID_FILE || file[i].fd == ngx_stderr) {
            continue;
        }

        if (ngx_close_file(file[i].fd) == NGX_FILE_ERROR) {
            ngx_log_error(NGX_LOG_EMERG, log, ngx_errno,
                          ngx_close_file_n " \"%s\" failed",
                          file[i].name.data);
        }
    }

    if (ngx_test_config) {
        ngx_destroy_cycle_pools(&conf);
        return NULL;
    }

    ls = cycle->listening.elts;
    for (i = 0; i < cycle->listening.nelts; i++) {
        if (ls[i].fd == (ngx_socket_t) -1 || !ls[i].open) {
            continue;
        }

        if (ngx_close_socket(ls[i].fd) == -1) {
            ngx_log_error(NGX_LOG_EMERG, log, ngx_socket_errno,
                          ngx_close_socket_n " %V failed",
                          &ls[i].addr_text);
        }
    }

    ngx_destroy_cycle_pools(&conf);

    return NULL;
}
static ngx_int_t
ngx_rtmp_auto_push_init_process(ngx_cycle_t *cycle)
{
#if (NGX_HAVE_UNIX_DOMAIN)
    ngx_rtmp_auto_push_conf_t  *apcf;
    ngx_listening_t            *ls, *lss;
    struct sockaddr_un         *saun;
    int                         reuseaddr;
    ngx_socket_t                s;
    size_t                      n;
    ngx_file_info_t             fi;

    if (ngx_process != NGX_PROCESS_WORKER) {
        return NGX_OK;
    }

    apcf = (ngx_rtmp_auto_push_conf_t *) ngx_get_conf(cycle->conf_ctx,
                                                    ngx_rtmp_auto_push_module);
    if (apcf->auto_push == 0) {
        return NGX_OK;
    }

    next_publish = ngx_rtmp_publish;
    ngx_rtmp_publish = ngx_rtmp_auto_push_publish;

    next_delete_stream = ngx_rtmp_delete_stream;
    ngx_rtmp_delete_stream = ngx_rtmp_auto_push_delete_stream;

    reuseaddr = 1;
    s = (ngx_socket_t) -1;

    ngx_log_debug0(NGX_LOG_DEBUG_RTMP, cycle->log, 0,
            "auto_push: creating sockets");

    /*TODO: clone all RTMP listenings? */
    ls = cycle->listening.elts;
    lss = NULL;
    for (n = 0; n < cycle->listening.nelts; ++n, ++ls) {
        if (ls->handler == ngx_rtmp_init_connection) {
            lss = ls;
            break;
        }
    }

    if (lss == NULL) {
        return NGX_OK;
    }

    ls = ngx_array_push(&cycle->listening);
    if (ls == NULL) {
        return NGX_ERROR;
    }

    *ls = *lss;

    /* Disable unix socket client address extraction
     * from accept call
     * Nginx generates bad addr_text with this enabled */
    ls->addr_ntop = 0;

    ls->socklen = sizeof(struct sockaddr_un);
    saun = ngx_pcalloc(cycle->pool, ls->socklen);
    ls->sockaddr = (struct sockaddr *) saun;
    if (ls->sockaddr == NULL) {
        return NGX_ERROR;
    }
    saun->sun_family = AF_UNIX;
    *ngx_snprintf((u_char *) saun->sun_path, sizeof(saun->sun_path),
                  "%V/" NGX_RTMP_AUTO_PUSH_SOCKNAME ".%i",
                  &apcf->socket_dir, ngx_process_slot)
        = 0;

    ngx_log_debug1(NGX_LOG_DEBUG_RTMP, cycle->log, 0,
                   "auto_push: create socket '%s'",
                   saun->sun_path);

    if (ngx_file_info(saun->sun_path, &fi) != ENOENT) {
        ngx_log_debug1(NGX_LOG_DEBUG_RTMP, cycle->log, 0,
                       "auto_push: delete existing socket '%s'",
                       saun->sun_path);
        ngx_delete_file(saun->sun_path);
    }

    ngx_str_set(&ls->addr_text, "worker_socket");

    s = ngx_socket(AF_UNIX, SOCK_STREAM, 0);
    if (s == -1) {
        ngx_log_error(NGX_LOG_EMERG, cycle->log, ngx_socket_errno,
                      ngx_socket_n " worker_socket failed");
        return NGX_ERROR;
    }

    if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR,
                   (const void *) &reuseaddr, sizeof(int))
        == -1)
    {
        ngx_log_error(NGX_LOG_EMERG, cycle->log, ngx_socket_errno,
                "setsockopt(SO_REUSEADDR) worker_socket failed");
        goto sock_error;
    }

    if (!(ngx_event_flags & NGX_USE_AIO_EVENT)) {
        if (ngx_nonblocking(s) == -1) {
            ngx_log_error(NGX_LOG_EMERG, cycle->log, ngx_socket_errno,
                          ngx_nonblocking_n " worker_socket failed");
            return NGX_ERROR;
        }
    }

    if (bind(s, (struct sockaddr *) saun, sizeof(*saun)) == -1) {
        ngx_log_error(NGX_LOG_EMERG, cycle->log, ngx_socket_errno,
                      ngx_nonblocking_n " worker_socket bind failed");
        goto sock_error;
    }

    if (listen(s, NGX_LISTEN_BACKLOG) == -1) {
        ngx_log_error(NGX_LOG_EMERG, cycle->log, ngx_socket_errno,
                      "listen() to worker_socket, backlog %d failed",
                      NGX_LISTEN_BACKLOG);
        goto sock_error;
    }

    ls->fd = s;
    ls->listen = 1;

    return NGX_OK;

sock_error:
    if (s != (ngx_socket_t) -1 && ngx_close_socket(s) == -1) {
        ngx_log_error(NGX_LOG_EMERG, cycle->log, ngx_socket_errno,
                ngx_close_socket_n " worker_socket failed");
    }
    ngx_delete_file(saun->sun_path);

    return NGX_ERROR;

#else  /* NGX_HAVE_UNIX_DOMAIN */

    return NGX_OK;

#endif /* NGX_HAVE_UNIX_DOMAIN */
}
예제 #8
0
/*
加载配置文件,并回调create_conf,init_conf, init_module等;
初始化各个配置,并打开监听端口,设置优化选项;
*/
ngx_cycle_t * ngx_init_cycle(ngx_cycle_t *old_cycle)
{//整个程序的主要初始化,配置加载,解析,各个模块的初始化回调函数,指令的set回调函数调用,监听端口打开,共享内存申请等等都在这里.
    void                *rv;
    char               **senv, **env;
    ngx_uint_t           i, n;
    ngx_log_t           *log;
    ngx_time_t          *tp;
    ngx_conf_t           conf;
    ngx_pool_t          *pool;
    ngx_cycle_t         *cycle, **old;
    ngx_shm_zone_t      *shm_zone, *oshm_zone;
    ngx_list_part_t     *part, *opart;
    ngx_open_file_t     *file;
    ngx_listening_t     *ls, *nls;
    ngx_core_conf_t     *ccf, *old_ccf;
    ngx_core_module_t   *module;
    char                 hostname[NGX_MAXHOSTNAMELEN];

    ngx_timezone_update();

    /* force localtime update with a new timezone */

    tp = ngx_timeofday();//k : ngx_cached_time
    tp->sec = 0;//秒设置为0
    ngx_time_update();//迫使当前的缓存时间更新。
    log = old_cycle->log;
    pool = ngx_create_pool(NGX_CYCLE_POOL_SIZE, log);
    if (pool == NULL) {
        return NULL;
    }
    pool->log = log;
    cycle = ngx_pcalloc(pool, sizeof(ngx_cycle_t));//下一个过程吗
    if (cycle == NULL) {
        ngx_destroy_pool(pool);
        return NULL;
    }
    cycle->pool = pool;//cycle也是包含在pool里面的! ,也就是,释放了cycle->pool后,cycle也释放了
    cycle->log = log;
    cycle->new_log.log_level = NGX_LOG_ERR;
    cycle->old_cycle = old_cycle;
//下面拷贝一下旧的配置路径什么的,参数等到新的cycle
    cycle->conf_prefix.len = old_cycle->conf_prefix.len;
    cycle->conf_prefix.data = ngx_pstrdup(pool, &old_cycle->conf_prefix);
    if (cycle->conf_prefix.data == NULL) {
        ngx_destroy_pool(pool);
        return NULL;
    }

    cycle->prefix.len = old_cycle->prefix.len;
    cycle->prefix.data = ngx_pstrdup(pool, &old_cycle->prefix);
    if (cycle->prefix.data == NULL) {
        ngx_destroy_pool(pool);
        return NULL;
    }

    cycle->conf_file.len = old_cycle->conf_file.len;
    cycle->conf_file.data = ngx_pnalloc(pool, old_cycle->conf_file.len + 1);
    if (cycle->conf_file.data == NULL) {
        ngx_destroy_pool(pool);
        return NULL;
    }
    ngx_cpystrn(cycle->conf_file.data, old_cycle->conf_file.data,
                old_cycle->conf_file.len + 1);

    cycle->conf_param.len = old_cycle->conf_param.len;
    cycle->conf_param.data = ngx_pstrdup(pool, &old_cycle->conf_param);
    if (cycle->conf_param.data == NULL) {
        ngx_destroy_pool(pool);
        return NULL;
    }

//干嘛的?
    n = old_cycle->pathes.nelts ? old_cycle->pathes.nelts : 10;

    cycle->pathes.elts = ngx_pcalloc(pool, n * sizeof(ngx_path_t *));
    if (cycle->pathes.elts == NULL) {
        ngx_destroy_pool(pool);
        return NULL;
    }

    cycle->pathes.nelts = 0;
    cycle->pathes.size = sizeof(ngx_path_t *);
    cycle->pathes.nalloc = n;
    cycle->pathes.pool = pool;

    if (old_cycle->open_files.part.nelts) {
        n = old_cycle->open_files.part.nelts;
        for (part = old_cycle->open_files.part.next; part; part = part->next) {
            n += part->nelts;
        }
    } else {
        n = 20;
    }
    if (ngx_list_init(&cycle->open_files, pool, n, sizeof(ngx_open_file_t)) != NGX_OK) {
        ngx_destroy_pool(pool);
        return NULL;
    }
//拷贝共享内存
    if (old_cycle->shared_memory.part.nelts) {
        n = old_cycle->shared_memory.part.nelts;
        for (part = old_cycle->shared_memory.part.next; part; part = part->next) {
            n += part->nelts;
        }
    } else {
        n = 1;
    }

    if (ngx_list_init(&cycle->shared_memory, pool, n, sizeof(ngx_shm_zone_t)) != NGX_OK)  {
        ngx_destroy_pool(pool);
        return NULL;
    }
//拷贝一下监听端口的信息;
    n = old_cycle->listening.nelts ? old_cycle->listening.nelts : 10;
    cycle->listening.elts = ngx_pcalloc(pool, n * sizeof(ngx_listening_t));
    if (cycle->listening.elts == NULL) {
        ngx_destroy_pool(pool);
        return NULL;
    }
    cycle->listening.nelts = 0;
    cycle->listening.size = sizeof(ngx_listening_t);
    cycle->listening.nalloc = n;
    cycle->listening.pool = pool;
//为每个模块分配一个配置上下文指针,用来保存每个模块设置的配置数据
    cycle->conf_ctx = ngx_pcalloc(pool, ngx_max_module * sizeof(void *));
    if (cycle->conf_ctx == NULL) {
        ngx_destroy_pool(pool);
        return NULL;
    }
    if (gethostname(hostname, NGX_MAXHOSTNAMELEN) == -1) {
        ngx_log_error(NGX_LOG_EMERG, log, ngx_errno, "gethostname() failed");
        ngx_destroy_pool(pool);
        return NULL;
    }

    /* on Linux gethostname() silently truncates name that does not fit */

    hostname[NGX_MAXHOSTNAMELEN - 1] = '\0';
    cycle->hostname.len = ngx_strlen(hostname);

    cycle->hostname.data = ngx_pnalloc(pool, cycle->hostname.len);
    if (cycle->hostname.data == NULL) {
        ngx_destroy_pool(pool);
        return NULL;
    }

    ngx_strlow(cycle->hostname.data, (u_char *) hostname, cycle->hostname.len);

	//k:for core modules.
    for (i = 0; ngx_modules[i]; i++) {
        if (ngx_modules[i]->type != NGX_CORE_MODULE) {
            continue;
        }
//对于核心模块
        module = ngx_modules[i]->ctx;
        if (module->create_conf) {//如果核心模块设置了create_conf回调,则调用它们
            rv = module->create_conf(cycle);
            if (rv == NULL) {
                ngx_destroy_pool(pool);
                return NULL;
            }
            cycle->conf_ctx[ ngx_modules[i]->index ] = rv;//帮模块们保存create_conf返回的数据。后续可以方便取到
        }
    }
    senv = environ;//保留老的environ,这个环境变量已经被我们拷贝到了新地址的
    ngx_memzero(&conf, sizeof(ngx_conf_t));
    /* STUB: init array ? */
    conf.args = ngx_array_create(pool, 10, sizeof(ngx_str_t));
    if (conf.args == NULL) {
        ngx_destroy_pool(pool);
        return NULL;
    }

    conf.temp_pool = ngx_create_pool(NGX_CYCLE_POOL_SIZE, log);
    if (conf.temp_pool == NULL) {
        ngx_destroy_pool(pool);
        return NULL;
    }
	

//切换到新的配置
    conf.ctx = cycle->conf_ctx;
    conf.cycle = cycle;
    conf.pool = pool;
    conf.log = log;
    conf.module_type = NGX_CORE_MODULE;
    conf.cmd_type = NGX_MAIN_CONF;
#if 0
    log->log_level = NGX_LOG_DEBUG_ALL;
#endif
    if (ngx_conf_param(&conf) != NGX_CONF_OK) {//调用ngx_conf_parse解析全局指令,貌似是做参数准备的。
        environ = senv;//还原老的environ,因为perl会改变它
        ngx_destroy_cycle_pools(&conf);
        return NULL;
    }
//解析配置文件,调用各个配置文件的set函数等。
    if (ngx_conf_parse(&conf, &cycle->conf_file) != NGX_CONF_OK) {
        environ = senv;
        ngx_destroy_cycle_pools(&conf);
        return NULL;
    }

    if (ngx_test_config && !ngx_quiet_mode) {//这就是经典的那个-t参数啦
        ngx_log_stderr(0, "the configuration file %s syntax is ok",  cycle->conf_file.data);
    }

    for (i = 0; ngx_modules[i]; i++) {
		//刚才各个配置指令已经调用了其set函数的。下面调用一下每个模块的init_conf,也就是每个模块的各个指令已经设置,现在开始模块本身了。
        if (ngx_modules[i]->type != NGX_CORE_MODULE) {
            continue;
        }
//对于NGX_CORE_MODULE,调用它他们的init_conf回调
        module = ngx_modules[i]->ctx;//得到模块初始化设置的数据,然后调用其init_conf
        if (module->init_conf) {
            if (module->init_conf(cycle, cycle->conf_ctx[ngx_modules[i]->index])== NGX_CONF_ERROR){ //第二个参数是在create_conf回调返回的东西
                environ = senv;
                ngx_destroy_cycle_pools(&conf);
                return NULL;
            }
        }
    }
    if (ngx_process == NGX_PROCESS_SIGNALLER) {
        return cycle;//如果是加-s reload等启动的,这里可以返回了。服务需要重启啥的,不是全新启动。在这里设置的ngx_get_options
    }
// 最核心的配置
    ccf = (ngx_core_conf_t *) ngx_get_conf(cycle->conf_ctx, ngx_core_module);//k conf_ctx[module.index]
    if (ngx_test_config) {
        if (ngx_create_pidfile(&ccf->pid, log) != NGX_OK) {
            goto failed;
        }
    } else if (!ngx_is_init_cycle(old_cycle)) {//第一次调用,old_cycle的配置相关的为空,第二次才是非空的。也就是下面的注释介绍的
        /*
         * we do not create the pid file in the first ngx_init_cycle() call
         * because we need to write the demonized process pid
         */
        old_ccf = (ngx_core_conf_t *) ngx_get_conf(old_cycle->conf_ctx, ngx_core_module);
        if (ccf->pid.len != old_ccf->pid.len || ngx_strcmp(ccf->pid.data, old_ccf->pid.data) != 0) {
            /* new pid file name */
            if (ngx_create_pidfile(&ccf->pid, log) != NGX_OK) {
                goto failed;
            }
            ngx_delete_pidfile(old_cycle);//删除旧的,这是啥原因,比如配置重新加载吗,文件变了啥的
        }
    }

//就打开文件,关闭,然后删除之
    if (ngx_test_lockfile(cycle->lock_file.data, log) != NGX_OK) {
        goto failed;
    }

//创建这些目录,并设置权限啥的
    if (ngx_create_pathes(cycle, ccf->user) != NGX_OK) {
        goto failed;
    }


    if (cycle->new_log.file == NULL) {//找到"logs/error.log"的ngx_open_file_t*结构,不open打开
        cycle->new_log.file = ngx_conf_open_file(cycle, &error_log);//"logs/error.log"
        if (cycle->new_log.file == NULL) {
            goto failed;
        }
    }

    /* open the new files */
    part = &cycle->open_files.part;
    file = part->elts;
//一个个打开这些文件,APPEND模式打开
    for (i = 0; /* void */ ; i++) {
        if (i >= part->nelts) {
            if (part->next == NULL) {
                break;
            }
            part = part->next;
            file = part->elts;
            i = 0;
        }
        if (file[i].name.len == 0) {
            continue;
        }
//真正打开这些文件,append模式
        file[i].fd = ngx_open_file(file[i].name.data,  NGX_FILE_APPEND, NGX_FILE_CREATE_OR_OPEN, NGX_FILE_DEFAULT_ACCESS);
        ngx_log_debug3(NGX_LOG_DEBUG_CORE, log, 0, "log: %p %d \"%s\"", &file[i], file[i].fd, file[i].name.data);
        if (file[i].fd == NGX_INVALID_FILE) {
            ngx_log_error(NGX_LOG_EMERG, log, ngx_errno, ngx_open_file_n " \"%s\" failed",  file[i].name.data);
            goto failed;
        }
#if !(NGX_WIN32)
		// 这里设置为FD_CLOEXEC表示当程序执行exec函数时本fd将被系统自动关闭,表示不传递给exec创建的新进程。close-on-exec
        if (fcntl(file[i].fd, F_SETFD, FD_CLOEXEC) == -1) {
            ngx_log_error(NGX_LOG_EMERG, log, ngx_errno, "fcntl(FD_CLOEXEC) \"%s\" failed", file[i].name.data);
            goto failed;
        }
#endif
    }

    cycle->log = &cycle->new_log;
    pool->log = &cycle->new_log;
    /* create shared memory */
    part = &cycle->shared_memory.part;
    shm_zone = part->elts;

    for (i = 0; /* void */ ; i++) {
        if (i >= part->nelts) {
            if (part->next == NULL) {
                break;
            }
            part = part->next;
            shm_zone = part->elts;
            i = 0;
        }
        if (shm_zone[i].shm.size == 0) {
            ngx_log_error(NGX_LOG_EMERG, log, 0, "zero size shared memory zone \"%V\"", &shm_zone[i].shm.name);
            goto failed;
        }
        if (shm_zone[i].init == NULL) {
            /* unused shared zone */
            continue;
        }
        shm_zone[i].shm.log = cycle->log;
        opart = &old_cycle->shared_memory.part;
        oshm_zone = opart->elts;
        for (n = 0; /* void */ ; n++) {
            if (n >= opart->nelts) {
                if (opart->next == NULL) {
                    break;
                }
                opart = opart->next;
                oshm_zone = opart->elts;
                n = 0;
            }
            if (shm_zone[i].shm.name.len != oshm_zone[n].shm.name.len) {
                continue;
            }

            if (ngx_strncmp(shm_zone[i].shm.name.data,
                            oshm_zone[n].shm.name.data,
                            shm_zone[i].shm.name.len)
                != 0)
            {
                continue;
            }

            if (shm_zone[i].shm.size == oshm_zone[n].shm.size) {
                shm_zone[i].shm.addr = oshm_zone[n].shm.addr;

                if (shm_zone[i].init(&shm_zone[i], oshm_zone[n].data)
                    != NGX_OK)
                {
                    goto failed;
                }

                goto shm_zone_found;
            }

            ngx_shm_free(&oshm_zone[n].shm);

            break;
        }

        if (ngx_shm_alloc(&shm_zone[i].shm) != NGX_OK) {
            goto failed;
        }

        if (ngx_init_zone_pool(cycle, &shm_zone[i]) != NGX_OK) {
            goto failed;
        }

        if (shm_zone[i].init(&shm_zone[i], NULL) != NGX_OK) {
            goto failed;
        }

    shm_zone_found:

        continue;
    }


    /* handle the listening sockets */
    if (old_cycle->listening.nelts) {//如果设置了继承SOCK,就拷贝到cycle来
        ls = old_cycle->listening.elts;
        for (i = 0; i < old_cycle->listening.nelts; i++) {
            ls[i].remain = 0;//标记为全都不需要了,后面会清除
        }

        nls = cycle->listening.elts;
        for (n = 0; n < cycle->listening.nelts; n++) {

            for (i = 0; i < old_cycle->listening.nelts; i++) {
                if (ls[i].ignore) {
                    continue;
                }

                if (ngx_cmp_sockaddr(nls[n].sockaddr, ls[i].sockaddr) == NGX_OK)
                {//如果地址完全相同,那后面就不需要关闭,直接拷贝fd就行了
                    nls[n].fd = ls[i].fd;
                    nls[n].previous = &ls[i];
                    ls[i].remain = 1;

                    if (ls[n].backlog != nls[i].backlog) {
                        nls[n].listen = 1;
                    }

#if (NGX_HAVE_DEFERRED_ACCEPT && defined SO_ACCEPTFILTER)

                    /*
                     * FreeBSD, except the most recent versions,
                     * could not remove accept filter
                     */
                    nls[n].deferred_accept = ls[i].deferred_accept;

                    if (ls[i].accept_filter && nls[n].accept_filter) {
                        if (ngx_strcmp(ls[i].accept_filter,
                                       nls[n].accept_filter)
                            != 0)
                        {
                            nls[n].delete_deferred = 1;
                            nls[n].add_deferred = 1;
                        }

                    } else if (ls[i].accept_filter) {
                        nls[n].delete_deferred = 1;

                    } else if (nls[n].accept_filter) {
                        nls[n].add_deferred = 1;
                    }
#endif

#if (NGX_HAVE_DEFERRED_ACCEPT && defined TCP_DEFER_ACCEPT)

                    if (ls[n].deferred_accept && !nls[n].deferred_accept) {
                        nls[n].delete_deferred = 1;

                    } else if (ls[i].deferred_accept != nls[n].deferred_accept)
                    {
                        nls[n].add_deferred = 1;
                    }
#endif
                    break;
                }
            }

            if (nls[n].fd == -1) {
                nls[n].open = 1;
            }
        }

    } else {
        ls = cycle->listening.elts;
        for (i = 0; i < cycle->listening.nelts; i++) {
            ls[i].open = 1;
#if (NGX_HAVE_DEFERRED_ACCEPT && defined SO_ACCEPTFILTER)
            if (ls[i].accept_filter) {
                ls[i].add_deferred = 1;
            }
#endif
#if (NGX_HAVE_DEFERRED_ACCEPT && defined TCP_DEFER_ACCEPT)
            if (ls[i].deferred_accept) {
                ls[i].add_deferred = 1;
            }
#endif
        }
    }
//下面一个个打开cycle->listening的listen的端口,并设置为listening端口
//这些监听端口的可读事件是在ngx_event_core_module模块中设置的,其进程初始化函数为ngx_event_process_init里面会放入epoll里面
    if (ngx_open_listening_sockets(cycle) != NGX_OK) {
        goto failed;
    }
    if (!ngx_test_config) {//如果不是测试配置,设置一下各个优化选项,比如发送,接收缓冲区大小,TCP_DEFER_ACCEPT等
        ngx_configure_listening_sockets(cycle);
    }

    /* commit the new cycle configuration */
    if (!ngx_use_stderr && cycle->log->file->fd != ngx_stderr) {
        if (ngx_set_stderr(cycle->log->file->fd) == NGX_FILE_ERROR) {
            ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno, ngx_set_stderr_n " failed");
        }
    }
    pool->log = cycle->log;
    for (i = 0; ngx_modules[i]; i++) {
        if (ngx_modules[i]->init_module) {//对所有模块,调用其init_module回调
            if (ngx_modules[i]->init_module(cycle) != NGX_OK) {
                /* fatal */
                exit(1);
            }
        }
    }

    /* close and delete stuff that lefts from an old cycle */
    /* free the unnecessary shared memory */
    opart = &old_cycle->shared_memory.part;
    oshm_zone = opart->elts;
    for (i = 0; /* void */ ; i++) {
        if (i >= opart->nelts) {
            if (opart->next == NULL) {
                goto old_shm_zone_done;
            }
            opart = opart->next;
            oshm_zone = opart->elts;
            i = 0;
        }
        part = &cycle->shared_memory.part;
        shm_zone = part->elts;
        for (n = 0; /* void */ ; n++) {
            if (n >= part->nelts) {
                if (part->next == NULL) {
                    break;
                }
                part = part->next;
                shm_zone = part->elts;
                n = 0;
            }
            if (oshm_zone[i].shm.name.len == shm_zone[n].shm.name.len
                && ngx_strncmp(oshm_zone[i].shm.name.data,
                               shm_zone[n].shm.name.data,
                               oshm_zone[i].shm.name.len)
                == 0){
                goto live_shm_zone;
            }
        }
        ngx_shm_free(&oshm_zone[i].shm);
    live_shm_zone:
        continue;
    }
old_shm_zone_done:
    /* close the unnecessary listening sockets */
    ls = old_cycle->listening.elts;
    for (i = 0; i < old_cycle->listening.nelts; i++) {
        if (ls[i].remain || ls[i].fd == -1) {
            continue;//需要保留或者fd无效,不用删除,因为已经拷贝到cycle中了
        }
        if (ngx_close_socket(ls[i].fd) == -1) {
            ngx_log_error(NGX_LOG_EMERG, log, ngx_socket_errno,ngx_close_socket_n " listening socket on %V failed", &ls[i].addr_text);
        }

#if (NGX_HAVE_UNIX_DOMAIN)
        if (ls[i].sockaddr->sa_family == AF_UNIX) {
            u_char  *name;
            name = ls[i].addr_text.data + sizeof("unix:") - 1;
            ngx_log_error(NGX_LOG_WARN, cycle->log, 0,
                          "deleting socket %s", name);
            if (ngx_delete_file(name) == -1) {
                ngx_log_error(NGX_LOG_EMERG, cycle->log, ngx_socket_errno,
                              ngx_delete_file_n " %s failed", name);
            }
        }

#endif
    }
    /* close the unnecessary open files */
    part = &old_cycle->open_files.part;
    file = part->elts;
    for (i = 0; /* void */ ; i++) {
        if (i >= part->nelts) {
            if (part->next == NULL) {
                break;
            }
            part = part->next;
            file = part->elts;
            i = 0;
        }
        if (file[i].fd == NGX_INVALID_FILE || file[i].fd == ngx_stderr) {
            continue;
        }
        if (ngx_close_file(file[i].fd) == NGX_FILE_ERROR) {
            ngx_log_error(NGX_LOG_EMERG, log, ngx_errno,
                          ngx_close_file_n " \"%s\" failed",
                          file[i].name.data);
        }
    }

    ngx_destroy_pool(conf.temp_pool);
    if (ngx_process == NGX_PROCESS_MASTER || ngx_is_init_cycle(old_cycle)) {//ngx_is_init_cycle第一次调用false
//这是怎么进来的?
        /*
         * perl_destruct() frees environ, if it is not the same as it was at
         * perl_construct() time, therefore we save the previous cycle
         * environment before ngx_conf_parse() where it will be changed.
         */

        env = environ;
        environ = senv;//还原之前保存的环境变量地址

        ngx_destroy_pool(old_cycle->pool);
        cycle->old_cycle = NULL;

        environ = env;

        return cycle;
    }


    if (ngx_temp_pool == NULL) {
        ngx_temp_pool = ngx_create_pool(128, cycle->log);
        if (ngx_temp_pool == NULL) {
            ngx_log_error(NGX_LOG_EMERG, cycle->log, 0,
                          "can not create ngx_temp_pool");
            exit(1);
        }

        n = 10;
        ngx_old_cycles.elts = ngx_pcalloc(ngx_temp_pool,
                                          n * sizeof(ngx_cycle_t *));
        if (ngx_old_cycles.elts == NULL) {
            exit(1);
        }
        ngx_old_cycles.nelts = 0;
        ngx_old_cycles.size = sizeof(ngx_cycle_t *);
        ngx_old_cycles.nalloc = n;
        ngx_old_cycles.pool = ngx_temp_pool;

        ngx_cleaner_event.handler = ngx_clean_old_cycles;
        ngx_cleaner_event.log = cycle->log;
        ngx_cleaner_event.data = &dumb;
        dumb.fd = (ngx_socket_t) -1;
    }

    ngx_temp_pool->log = cycle->log;

    old = ngx_array_push(&ngx_old_cycles);
    if (old == NULL) {
        exit(1);
    }
    *old = old_cycle;

    if (!ngx_cleaner_event.timer_set) {//如果还没有设置定时器,设置定时器,30秒后清除老的cycle?
        ngx_add_timer(&ngx_cleaner_event, 30000);
        ngx_cleaner_event.timer_set = 1;//标记此处已经设置过定时器了。
    }

    return cycle;


failed:

    if (!ngx_is_init_cycle(old_cycle)) {
        old_ccf = (ngx_core_conf_t *) ngx_get_conf(old_cycle->conf_ctx,
                                                   ngx_core_module);
        if (old_ccf->environment) {
            environ = old_ccf->environment;
        }
    }
    /* rollback the new cycle configuration */
    part = &cycle->open_files.part;
    file = part->elts;
    for (i = 0; /* void */ ; i++) {
        if (i >= part->nelts) {
            if (part->next == NULL) {
                break;
            }
            part = part->next;
            file = part->elts;
            i = 0;
        }

        if (file[i].fd == NGX_INVALID_FILE || file[i].fd == ngx_stderr) {
            continue;
        }

        if (ngx_close_file(file[i].fd) == NGX_FILE_ERROR) {
            ngx_log_error(NGX_LOG_EMERG, log, ngx_errno,
                          ngx_close_file_n " \"%s\" failed",
                          file[i].name.data);
        }
    }

    if (ngx_test_config) {
        ngx_destroy_cycle_pools(&conf);
        return NULL;
    }

    ls = cycle->listening.elts;
    for (i = 0; i < cycle->listening.nelts; i++) {
        if (ls[i].fd == -1 || !ls[i].open) {
            continue;
        }

        if (ngx_close_socket(ls[i].fd) == -1) {
            ngx_log_error(NGX_LOG_EMERG, log, ngx_socket_errno,
                          ngx_close_socket_n " %V failed",
                          &ls[i].addr_text);
        }
    }

    ngx_destroy_cycle_pools(&conf);

    return NULL;
}
static void
ngx_http_dav_put_handler(ngx_http_request_t *r)
{
    size_t                    root;
    time_t                    date;
    ngx_str_t                *temp, path;
    ngx_uint_t                status;
    ngx_file_info_t           fi;
    ngx_ext_rename_file_t     ext;
    ngx_http_dav_loc_conf_t  *dlcf;

    ngx_http_map_uri_to_path(r, &path, &root, 0);

    ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
                   "http put filename: \"%s\"", path.data);

    temp = &r->request_body->temp_file->file.name;

    if (ngx_file_info(path.data, &fi) == -1) {
        status = NGX_HTTP_CREATED;

    } else {
        status = NGX_HTTP_NO_CONTENT;

        if (ngx_is_dir(&fi)) {
            ngx_log_error(NGX_LOG_ERR, r->connection->log, NGX_EISDIR,
                          "\"%s\" could not be created", path.data);

            if (ngx_delete_file(temp->data) == NGX_FILE_ERROR) {
                ngx_log_error(NGX_LOG_CRIT, r->connection->log, ngx_errno,
                              ngx_delete_file_n " \"%s\" failed",
                              temp->data);
            }

            ngx_http_finalize_request(r, NGX_HTTP_CONFLICT);
            return;
        }
    }

    dlcf = ngx_http_get_module_loc_conf(r, ngx_http_dav_module);

    ext.access = dlcf->access;
    ext.time = -1;
    ext.create_path = dlcf->create_full_put_path;
    ext.delete_file = 1;
    ext.log = r->connection->log;

    if (r->headers_in.date) {
        date = ngx_http_parse_time(r->headers_in.date->value.data,
                                   r->headers_in.date->value.len);

        if (date != NGX_ERROR) {
            ext.time = date;
            ext.fd = r->request_body->temp_file->file.fd;
        }
    }

    if (ngx_ext_rename_file(temp, &path, &ext) != NGX_OK) {
        ngx_http_finalize_request(r, NGX_HTTP_INTERNAL_SERVER_ERROR);
        return;
    }

    if (status == NGX_HTTP_CREATED) {
        if (ngx_http_dav_location(r, path.data) != NGX_OK) {
            ngx_http_finalize_request(r, NGX_HTTP_INTERNAL_SERVER_ERROR);
            return;
        }

        r->headers_out.content_length_n = 0;
    }

    r->headers_out.status = status;
    r->header_only = 1;

    ngx_http_finalize_request(r, ngx_http_send_header(r));
    return;
}
예제 #10
0
ngx_int_t
ngx_open_listening_sockets(ngx_cycle_t *cycle)
{
    int               reuseaddr;
    ngx_uint_t        i, tries, failed;
    ngx_err_t         err;
    ngx_log_t        *log;
    ngx_socket_t      s;
    ngx_listening_t  *ls;

    reuseaddr = 1;
#if (NGX_SUPPRESS_WARN)
    failed = 0;
#endif

    log = cycle->log;

    /* TODO: configurable try number */

    for (tries = 5; tries; tries--) {
        failed = 0;

        /* for each listening socket */

        ls = cycle->listening.elts;
        for (i = 0; i < cycle->listening.nelts; i++) {

            if (ls[i].ignore) {
                continue;
            }

#if (NGX_HAVE_REUSEPORT)

            if (ls[i].add_reuseport) {

                /*
                 * to allow transition from a socket without SO_REUSEPORT
                 * to multiple sockets with SO_REUSEPORT, we have to set
                 * SO_REUSEPORT on the old socket before opening new ones
                 */

                int  reuseport = 1;

                if (setsockopt(ls[i].fd, SOL_SOCKET, SO_REUSEPORT,
                               (const void *) &reuseport, sizeof(int))
                    == -1)
                {
                    ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_socket_errno,
                                  "setsockopt(SO_REUSEPORT) %V failed, ignored",
                                  &ls[i].addr_text);
                }

                ls[i].add_reuseport = 0;
            }
#endif

            if (ls[i].fd != (ngx_socket_t) -1) {
                continue;
            }

            if (ls[i].inherited) {

                /* TODO: close on exit */
                /* TODO: nonblocking */
                /* TODO: deferred accept */

                continue;
            }

            s = ngx_socket(ls[i].sockaddr->sa_family, ls[i].type, 0);

            if (s == (ngx_socket_t) -1) {
                ngx_log_error(NGX_LOG_EMERG, log, ngx_socket_errno,
                              ngx_socket_n " %V failed", &ls[i].addr_text);
                return NGX_ERROR;
            }

            if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR,
                           (const void *) &reuseaddr, sizeof(int))
                == -1)
            {
                ngx_log_error(NGX_LOG_EMERG, log, ngx_socket_errno,
                              "setsockopt(SO_REUSEADDR) %V failed",
                              &ls[i].addr_text);

                if (ngx_close_socket(s) == -1) {
                    ngx_log_error(NGX_LOG_EMERG, log, ngx_socket_errno,
                                  ngx_close_socket_n " %V failed",
                                  &ls[i].addr_text);
                }

                return NGX_ERROR;
            }

#if (NGX_HAVE_REUSEPORT)

            if (ls[i].reuseport) {
                int  reuseport;

                reuseport = 1;

                if (setsockopt(s, SOL_SOCKET, SO_REUSEPORT,
                               (const void *) &reuseport, sizeof(int))
                    == -1)
                {
                    ngx_log_error(NGX_LOG_EMERG, log, ngx_socket_errno,
                                  "setsockopt(SO_REUSEPORT) %V failed, ignored",
                                  &ls[i].addr_text);

                    if (ngx_close_socket(s) == -1) {
                        ngx_log_error(NGX_LOG_EMERG, log, ngx_socket_errno,
                                      ngx_close_socket_n " %V failed",
                                      &ls[i].addr_text);
                    }

                    return NGX_ERROR;
                }
            }
#endif

#if (NGX_HAVE_INET6 && defined IPV6_V6ONLY)

            if (ls[i].sockaddr->sa_family == AF_INET6) {
                int  ipv6only;

                ipv6only = ls[i].ipv6only;

                if (setsockopt(s, IPPROTO_IPV6, IPV6_V6ONLY,
                               (const void *) &ipv6only, sizeof(int))
                    == -1)
                {
                    ngx_log_error(NGX_LOG_EMERG, log, ngx_socket_errno,
                                  "setsockopt(IPV6_V6ONLY) %V failed, ignored",
                                  &ls[i].addr_text);
                }
            }
#endif
            /* TODO: close on exit */

            if (!(ngx_event_flags & NGX_USE_IOCP_EVENT)) {
                if (ngx_nonblocking(s) == -1) {
                    ngx_log_error(NGX_LOG_EMERG, log, ngx_socket_errno,
                                  ngx_nonblocking_n " %V failed",
                                  &ls[i].addr_text);

                    if (ngx_close_socket(s) == -1) {
                        ngx_log_error(NGX_LOG_EMERG, log, ngx_socket_errno,
                                      ngx_close_socket_n " %V failed",
                                      &ls[i].addr_text);
                    }

                    return NGX_ERROR;
                }
            }

            ngx_log_debug2(NGX_LOG_DEBUG_CORE, log, 0,
                           "bind() %V #%d ", &ls[i].addr_text, s);

            if (bind(s, ls[i].sockaddr, ls[i].socklen) == -1) {
                err = ngx_socket_errno;

                if (err != NGX_EADDRINUSE || !ngx_test_config) {
                    ngx_log_error(NGX_LOG_EMERG, log, err,
                                  "bind() to %V failed", &ls[i].addr_text);
                }

                if (ngx_close_socket(s) == -1) {
                    ngx_log_error(NGX_LOG_EMERG, log, ngx_socket_errno,
                                  ngx_close_socket_n " %V failed",
                                  &ls[i].addr_text);
                }

                if (err != NGX_EADDRINUSE) {
                    return NGX_ERROR;
                }

                if (!ngx_test_config) {
                    failed = 1;
                }

                continue;
            }

#if (NGX_HAVE_UNIX_DOMAIN)

            if (ls[i].sockaddr->sa_family == AF_UNIX) {
                mode_t   mode;
                u_char  *name;

                name = ls[i].addr_text.data + sizeof("unix:") - 1;
                mode = (S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP|S_IROTH|S_IWOTH);

                if (chmod((char *) name, mode) == -1) {
                    ngx_log_error(NGX_LOG_EMERG, cycle->log, ngx_errno,
                                  "chmod() \"%s\" failed", name);
                }

                if (ngx_test_config) {
                    if (ngx_delete_file(name) == NGX_FILE_ERROR) {
                        ngx_log_error(NGX_LOG_EMERG, cycle->log, ngx_errno,
                                      ngx_delete_file_n " %s failed", name);
                    }
                }
            }
#endif

            if (
#if (NGX_QUIC)
                ! ngx_listening_is_quic(&ls[i]) &&
#endif
                listen(s, ls[i].backlog) == -1) {
                err = ngx_socket_errno;

                /*
                 * on OpenVZ after suspend/resume EADDRINUSE
                 * may be returned by listen() instead of bind(), see
                 * https://bugzilla.openvz.org/show_bug.cgi?id=2470
                 */

                if (err != NGX_EADDRINUSE || !ngx_test_config) {
                    ngx_log_error(NGX_LOG_EMERG, log, err,
                                  "listen() to %V, backlog %d failed",
                                  &ls[i].addr_text, ls[i].backlog);
                }

                if (ngx_close_socket(s) == -1) {
                    ngx_log_error(NGX_LOG_EMERG, log, ngx_socket_errno,
                                  ngx_close_socket_n " %V failed",
                                  &ls[i].addr_text);
                }

                if (err != NGX_EADDRINUSE) {
                    return NGX_ERROR;
                }

                if (!ngx_test_config) {
                    failed = 1;
                }

                continue;
            }

            ls[i].listen = 1;

            ls[i].fd = s;
        }

        if (!failed) {
            break;
        }

        /* TODO: delay configurable */

        ngx_log_error(NGX_LOG_NOTICE, log, 0,
                      "try again to bind() after 500ms");

        ngx_msleep(500);
    }

    if (failed) {
        ngx_log_error(NGX_LOG_EMERG, log, 0, "still could not bind()");
        return NGX_ERROR;
    }

    return NGX_OK;
}
예제 #11
0
ngx_int_t
ngx_http_file_cache_purge(ngx_http_request_t *r)
{
    ngx_http_file_cache_t  *cache;
    ngx_http_cache_t       *c;

    switch (ngx_http_file_cache_open(r)) {
    case NGX_OK:
    case NGX_HTTP_CACHE_STALE:
#  if defined(nginx_version) \
      && ((nginx_version >= 8001) \
          || ((nginx_version < 8000) && (nginx_version >= 7060)))
    case NGX_HTTP_CACHE_UPDATING:
#  endif
        break;
    case NGX_DECLINED:
        return NGX_DECLINED;
#  if (NGX_HAVE_FILE_AIO)
    case NGX_AGAIN:
        return NGX_AGAIN;
#  endif
    default:
        return NGX_ERROR;
    }

    c = r->cache;
    cache = c->file_cache;

    /*
     * delete file from disk but *keep* in-memory node,
     * because other requests might still point to it.
     */

    ngx_shmtx_lock(&cache->shpool->mutex);

    if (!c->node->exists) {
        /* race between concurrent purges, backoff */
        ngx_shmtx_unlock(&cache->shpool->mutex);
        return NGX_DECLINED;
    }

#  if defined(nginx_version) && (nginx_version >= 1000001)
    cache->sh->size -= c->node->fs_size;
    c->node->fs_size = 0;
#  else
    cache->sh->size -= (c->node->length + cache->bsize - 1) / cache->bsize;
    c->node->length = 0;
#  endif

    c->node->exists = 0;
#  if defined(nginx_version) \
      && ((nginx_version >= 8001) \
          || ((nginx_version < 8000) && (nginx_version >= 7060)))
    c->node->updating = 0;
#  endif

    ngx_shmtx_unlock(&cache->shpool->mutex);

    if (ngx_delete_file(c->file.name.data) == NGX_FILE_ERROR) {
        /* entry in error log is enough, don't notice client */
        ngx_log_error(NGX_LOG_CRIT, r->connection->log, ngx_errno,
                      ngx_delete_file_n " \"%s\" failed", c->file.name.data);
    }

    /* file deleted from cache */
    return NGX_OK;
}
예제 #12
0
/*初始化全局唯一的ngx_cycle_t*/
ngx_cycle_t *
ngx_init_cycle(ngx_cycle_t *old_cycle)
{
    void                *rv;
    char               **senv, **env;
    ngx_uint_t           i, n;
    ngx_log_t           *log;
    ngx_time_t          *tp;
    ngx_conf_t           conf;
    ngx_pool_t          *pool;
    ngx_cycle_t         *cycle, **old;
    ngx_shm_zone_t      *shm_zone, *oshm_zone;
    ngx_list_part_t     *part, *opart;
    ngx_open_file_t     *file;
    ngx_listening_t     *ls, *nls;
    ngx_core_conf_t     *ccf, *old_ccf;
    ngx_core_module_t   *module;
    char                 hostname[NGX_MAXHOSTNAMELEN];

    ngx_timezone_update();

    /* force localtime update with a new timezone */

    /*获取缓存的当前时间*/
    tp = ngx_timeofday();
    tp->sec = 0;

    /*更新时间*/
    ngx_time_update();


    log = old_cycle->log;

    /*创建内存池*/
    pool = ngx_create_pool(NGX_CYCLE_POOL_SIZE, log);
    if (pool == NULL) {
        return NULL;
    }
    pool->log = log;

    /*申请cycle*/
    cycle = ngx_pcalloc(pool, sizeof(ngx_cycle_t));
    if (cycle == NULL) {
        ngx_destroy_pool(pool);
        return NULL;
    }

    cycle->pool = pool;
    cycle->log = log;
    cycle->old_cycle = old_cycle;

    /*转存conf_prefix*/
    cycle->conf_prefix.len = old_cycle->conf_prefix.len;
    cycle->conf_prefix.data = ngx_pstrdup(pool, &old_cycle->conf_prefix);
    if (cycle->conf_prefix.data == NULL) {
        ngx_destroy_pool(pool);
        return NULL;
    }

    /*转存prefix*/
    cycle->prefix.len = old_cycle->prefix.len;
    cycle->prefix.data = ngx_pstrdup(pool, &old_cycle->prefix);
    if (cycle->prefix.data == NULL) {
        ngx_destroy_pool(pool);
        return NULL;
    }

    /*转存conf_file*/
    cycle->conf_file.len = old_cycle->conf_file.len;
    cycle->conf_file.data = ngx_pnalloc(pool, old_cycle->conf_file.len + 1);
    if (cycle->conf_file.data == NULL) {
        ngx_destroy_pool(pool);
        return NULL;
    }
    ngx_cpystrn(cycle->conf_file.data, old_cycle->conf_file.data,
                old_cycle->conf_file.len + 1);

    /*转存conf_param*/
    cycle->conf_param.len = old_cycle->conf_param.len;
    cycle->conf_param.data = ngx_pstrdup(pool, &old_cycle->conf_param);
    if (cycle->conf_param.data == NULL) {
        ngx_destroy_pool(pool);
        return NULL;
    }


    /*初始化paths动态数组,其中保存的是nginx所要操作的目录*/
    n = old_cycle->paths.nelts ? old_cycle->paths.nelts : 10;

    cycle->paths.elts = ngx_pcalloc(pool, n * sizeof(ngx_path_t *));
    if (cycle->paths.elts == NULL) {
        ngx_destroy_pool(pool);
        return NULL;
    }

    cycle->paths.nelts = 0;
    cycle->paths.size = sizeof(ngx_path_t *);
    cycle->paths.nalloc = n;
    cycle->paths.pool = pool;


    /*初始化cycle->config_dump动态数组*/
    if (ngx_array_init(&cycle->config_dump, pool, 1, sizeof(ngx_conf_dump_t))
        != NGX_OK)
    {
        ngx_destroy_pool(pool);
        return NULL;
    }

    if (old_cycle->open_files.part.nelts) {
        n = old_cycle->open_files.part.nelts;
        for (part = old_cycle->open_files.part.next; part; part = part->next) {
            n += part->nelts;
        }

    } else {
        n = 20;
    }

    /*初始化cycle->open_files链表*/
    if (ngx_list_init(&cycle->open_files, pool, n, sizeof(ngx_open_file_t))
        != NGX_OK)
    {
        ngx_destroy_pool(pool);
        return NULL;
    }


    if (old_cycle->shared_memory.part.nelts) {
        n = old_cycle->shared_memory.part.nelts;
        for (part = old_cycle->shared_memory.part.next; part; part = part->next)
        {
            n += part->nelts;
        }

    } else {
        n = 1;
    }

    /*初始化cycle->shared_memory共享内存*/
    if (ngx_list_init(&cycle->shared_memory, pool, n, sizeof(ngx_shm_zone_t))
        != NGX_OK)
    {
        ngx_destroy_pool(pool);
        return NULL;
    }

    /*初始化cycle->listening动态数组*/
    n = old_cycle->listening.nelts ? old_cycle->listening.nelts : 10;

    cycle->listening.elts = ngx_pcalloc(pool, n * sizeof(ngx_listening_t));
    if (cycle->listening.elts == NULL) {
        ngx_destroy_pool(pool);
        return NULL;
    }

    cycle->listening.nelts = 0;
    cycle->listening.size = sizeof(ngx_listening_t);
    cycle->listening.nalloc = n;
    cycle->listening.pool = pool;


    ngx_queue_init(&cycle->reusable_connections_queue);


    /*初始化存储所有模块配置项结构体的指针*/
    cycle->conf_ctx = ngx_pcalloc(pool, ngx_max_module * sizeof(void *));
    if (cycle->conf_ctx == NULL) {
        ngx_destroy_pool(pool);
        return NULL;
    }


    /*获取主机名,并初始化cycle->hostname*/
    if (gethostname(hostname, NGX_MAXHOSTNAMELEN) == -1) {
        ngx_log_error(NGX_LOG_EMERG, log, ngx_errno, "gethostname() failed");
        ngx_destroy_pool(pool);
        return NULL;
    }

    /* on Linux gethostname() silently truncates name that does not fit */

    hostname[NGX_MAXHOSTNAMELEN - 1] = '\0';
    cycle->hostname.len = ngx_strlen(hostname);

    cycle->hostname.data = ngx_pnalloc(pool, cycle->hostname.len);
    if (cycle->hostname.data == NULL) {
        ngx_destroy_pool(pool);
        return NULL;
    }

    ngx_strlow(cycle->hostname.data, (u_char *) hostname, cycle->hostname.len);


    /*初始化cycle->modules cycle->modules_n*/
    if (ngx_cycle_modules(cycle) != NGX_OK) {
        ngx_destroy_pool(pool);
        return NULL;
    }


    /*处理所有的NGX_CORE_MODULE,调用所有核心模块的create_conf函数创建存储配置项的结构体*/
    for (i = 0; cycle->modules[i]; i++) {
        if (cycle->modules[i]->type != NGX_CORE_MODULE) {
            continue;
        }

        /*获取模块上下文*/
        module = cycle->modules[i]->ctx;

        if (module->create_conf) {
            rv = module->create_conf(cycle);
            if (rv == NULL) {
                ngx_destroy_pool(pool);
                return NULL;
            }
            cycle->conf_ctx[cycle->modules[i]->index] = rv;  //将创建的存储配置项的结构体挂在cycle->conf_ctx中
        }
    }


    /*暂存环境变量*/
    senv = environ;


    ngx_memzero(&conf, sizeof(ngx_conf_t));
    /* STUB: init array ? */
    conf.args = ngx_array_create(pool, 10, sizeof(ngx_str_t));
    if (conf.args == NULL) {
        ngx_destroy_pool(pool);
        return NULL;
    }

    conf.temp_pool = ngx_create_pool(NGX_CYCLE_POOL_SIZE, log);
    if (conf.temp_pool == NULL) {
        ngx_destroy_pool(pool);
        return NULL;
    }


    /*conf.ctx指向的是cycle->conf_ctx*/
    conf.ctx = cycle->conf_ctx;
    conf.cycle = cycle;
    conf.pool = pool;
    conf.log = log;
    conf.module_type = NGX_CORE_MODULE;
    conf.cmd_type = NGX_MAIN_CONF;

#if 0
    log->log_level = NGX_LOG_DEBUG_ALL;
#endif

    /*解析-g携带的参数中需要特殊处理的配置项及其参数值*/
    if (ngx_conf_param(&conf) != NGX_CONF_OK) {
        environ = senv;
        ngx_destroy_cycle_pools(&conf);
        return NULL;
    }

    /*针对所有核心模块解析nginx.conf配置文件*/
    if (ngx_conf_parse(&conf, &cycle->conf_file) != NGX_CONF_OK) {
        environ = senv;  //恢复环境
        ngx_destroy_cycle_pools(&conf);
        return NULL;
    }

    if (ngx_test_config && !ngx_quiet_mode) {
        ngx_log_stderr(0, "the configuration file %s syntax is ok",
                       cycle->conf_file.data);
    }

    /*调用所有核心模块的init_conf方法*/
    for (i = 0; cycle->modules[i]; i++) {
        if (cycle->modules[i]->type != NGX_CORE_MODULE) {
            continue;
        }

        module = cycle->modules[i]->ctx;

        if (module->init_conf) {
            if (module->init_conf(cycle,
                                  cycle->conf_ctx[cycle->modules[i]->index])
                == NGX_CONF_ERROR)
            {
                environ = senv;
                ngx_destroy_cycle_pools(&conf);
                return NULL;
            }
        }
    }

    /*单进程模式,返回*/
    if (ngx_process == NGX_PROCESS_SIGNALLER) {
        return cycle;
    }

    /*获取核心模块的存储配置项结构体的指针*/
    ccf = (ngx_core_conf_t *) ngx_get_conf(cycle->conf_ctx, ngx_core_module);

    if (ngx_test_config) {

        if (ngx_create_pidfile(&ccf->pid, log) != NGX_OK) {
            goto failed;
        }

    } else if (!ngx_is_init_cycle(old_cycle)) {  //cycle->conf_ctx != NULL

        /*
         * we do not create the pid file in the first ngx_init_cycle() call
         * because we need to write the demonized process pid
         */

        /*获取临时的核心模块存储配置项的结构体指针*/
        old_ccf = (ngx_core_conf_t *) ngx_get_conf(old_cycle->conf_ctx,
                                                   ngx_core_module);

        /*创建pidfile*/
        if (ccf->pid.len != old_ccf->pid.len
            || ngx_strcmp(ccf->pid.data, old_ccf->pid.data) != 0)
        {
            /* new pid file name */

            /*创建新的pidfile并写入当前进程id*/
            if (ngx_create_pidfile(&ccf->pid, log) != NGX_OK) {
                goto failed;
            }

            /*删除老的pidfile*/
            ngx_delete_pidfile(old_cycle);
        }
    }


    if (ngx_test_lockfile(cycle->lock_file.data, log) != NGX_OK) {
        goto failed;
    }


    /*创建在配置文件中出现的文件目录*/
    if (ngx_create_paths(cycle, ccf->user) != NGX_OK) {
        goto failed;
    }


    /*打开日志文件*/
    if (ngx_log_open_default(cycle) != NGX_OK) {
        goto failed;
    }

    /* open the new files */

    /*打开open_files动态数组中的没有打开的文件*/
    part = &cycle->open_files.part;
    file = part->elts;

    for (i = 0; /* void */ ; i++) {

        if (i >= part->nelts) {
            if (part->next == NULL) {
                break;
            }
            part = part->next;
            file = part->elts;
            i = 0;
        }

        if (file[i].name.len == 0) {
            continue;
        }

        /*
         * 在打开文件时候带有O_APPEND选项,则当有多个进程往这个文件写入内容的时候,
         * 每个操作都是原子性的,这样就保证了内容的正确性。举个例子,多个worker进程
         * 可能存在同时往一个日志文件中写入内容的情况,这个时候每个write都是原子性的。
         */
        file[i].fd = ngx_open_file(file[i].name.data,
                                   NGX_FILE_APPEND,
                                   NGX_FILE_CREATE_OR_OPEN,
                                   NGX_FILE_DEFAULT_ACCESS);

        ngx_log_debug3(NGX_LOG_DEBUG_CORE, log, 0,
                       "log: %p %d \"%s\"",
                       &file[i], file[i].fd, file[i].name.data);

        if (file[i].fd == NGX_INVALID_FILE) {
            ngx_log_error(NGX_LOG_EMERG, log, ngx_errno,
                          ngx_open_file_n " \"%s\" failed",
                          file[i].name.data);
            goto failed;
        }

#if !(NGX_WIN32)
        if (fcntl(file[i].fd, F_SETFD, FD_CLOEXEC) == -1) {
            ngx_log_error(NGX_LOG_EMERG, log, ngx_errno,
                          "fcntl(FD_CLOEXEC) \"%s\" failed",
                          file[i].name.data);
            goto failed;
        }
#endif
    }

    /*log也指向了日志文件,不再打屏*/
    cycle->log = &cycle->new_log;
    pool->log = &cycle->new_log;


    /* create shared memory */

    /*创建共享内存*/
    /*
     * 当模块调用ngx_shared_memory_add函数的时候并没有申请空间,只是说该模块需要使用共享内存,并挂在cycle->shared_memoery
     * 然后在这个地方才开始真正进行初始化申请共享内存
     */
    part = &cycle->shared_memory.part;
    shm_zone = part->elts;

    for (i = 0; /* void */ ; i++) {

        if (i >= part->nelts) {
            if (part->next == NULL) {
                break;
            }
            part = part->next;
            shm_zone = part->elts;
            i = 0;
        }

        if (shm_zone[i].shm.size == 0) {
            ngx_log_error(NGX_LOG_EMERG, log, 0,
                          "zero size shared memory zone \"%V\"",
                          &shm_zone[i].shm.name);
            goto failed;
        }

        shm_zone[i].shm.log = cycle->log;

        /*下面涉及到共享内存的复用*/
        opart = &old_cycle->shared_memory.part;
        oshm_zone = opart->elts;

        for (n = 0; /* void */ ; n++) {

            if (n >= opart->nelts) {
                if (opart->next == NULL) {
                    break;
                }
                opart = opart->next;
                oshm_zone = opart->elts;
                n = 0;
            }

            /*判断共享内存的名字长度是否一样*/
            if (shm_zone[i].shm.name.len != oshm_zone[n].shm.name.len) {
                continue;
            }

            /*判断共享内存的名字是否一样*/
            if (ngx_strncmp(shm_zone[i].shm.name.data,
                            oshm_zone[n].shm.name.data,
                            shm_zone[i].shm.name.len)
                != 0)
            {
                continue;
            }

            /*判断tag size是否一样,并且共享内存是可重用的*/
            if (shm_zone[i].tag == oshm_zone[n].tag
                && shm_zone[i].shm.size == oshm_zone[n].shm.size
                && !shm_zone[i].noreuse)
            {
                shm_zone[i].shm.addr = oshm_zone[n].shm.addr;
#if (NGX_WIN32)
                shm_zone[i].shm.handle = oshm_zone[n].shm.handle;
#endif

                /*找到了可重用的共享内存,进行初始化*/
                if (shm_zone[i].init(&shm_zone[i], oshm_zone[n].data)
                    != NGX_OK)
                {
                    goto failed;
                }

                goto shm_zone_found;
            }

            ngx_shm_free(&oshm_zone[n].shm);

            break;
        }
        
        /*程序执行到这里说明没有找到可重用的共享内存,需要重新申请*/
        /*申请共享内存*/
        if (ngx_shm_alloc(&shm_zone[i].shm) != NGX_OK) {
            goto failed;
        }

        /*初始化shm共享内存池*/
        if (ngx_init_zone_pool(cycle, &shm_zone[i]) != NGX_OK) {
            goto failed;
        }

        /*创建并初始化好共享内存后调用模块实现的初始化方法*/
        if (shm_zone[i].init(&shm_zone[i], NULL) != NGX_OK) {
            goto failed;
        }

    shm_zone_found:

        continue;
    }


    /* handle the listening sockets */

    /*old_cycle->listening.nelts不为0,表示平滑升级时从旧版本nginx服务中继承了监听端口*/
    if (old_cycle->listening.nelts) {
        ls = old_cycle->listening.elts;
        for (i = 0; i < old_cycle->listening.nelts; i++) {
            ls[i].remain = 0;  //ngx_listening_t->remain=0表示正常关闭原来打开的端口,这里表示关闭临时cycle打开的监听端口
        }

        nls = cycle->listening.elts;
        for (n = 0; n < cycle->listening.nelts; n++) {

            for (i = 0; i < old_cycle->listening.nelts; i++) {
                if (ls[i].ignore) {  //ignore为1表示跳过设置该套接字
                    continue;
                }

                if (ls[i].remain) {  //remain为1表示不关闭原先打开的端口(上面已经该临时cycle的该字段置为0)
                    continue;
                }

                /*套接字类型不匹配*/
                if (ls[i].type != nls[n].type) {
                    continue;
                }

                /*判断sockadd是否一致*/
                if (ngx_cmp_sockaddr(nls[n].sockaddr, nls[n].socklen,
                                     ls[i].sockaddr, ls[i].socklen, 1)
                    == NGX_OK)
                {
                    /*保存旧cycle监听的结构体,并将remian置为1*/
                    nls[n].fd = ls[i].fd;
                    nls[n].previous = &ls[i];
                    ls[i].remain = 1;

                    if (ls[i].backlog != nls[n].backlog) {
                        nls[n].listen = 1;
                    }

#if (NGX_HAVE_DEFERRED_ACCEPT && defined SO_ACCEPTFILTER)

                    /*
                     * FreeBSD, except the most recent versions,
                     * could not remove accept filter
                     */
                    nls[n].deferred_accept = ls[i].deferred_accept;

                    if (ls[i].accept_filter && nls[n].accept_filter) {
                        if (ngx_strcmp(ls[i].accept_filter,
                                       nls[n].accept_filter)
                            != 0)
                        {
                            nls[n].delete_deferred = 1;
                            nls[n].add_deferred = 1;
                        }

                    } else if (ls[i].accept_filter) {
                        nls[n].delete_deferred = 1;

                    } else if (nls[n].accept_filter) {
                        nls[n].add_deferred = 1;
                    }
#endif

#if (NGX_HAVE_DEFERRED_ACCEPT && defined TCP_DEFER_ACCEPT)

                    if (ls[i].deferred_accept && !nls[n].deferred_accept) {
                        nls[n].delete_deferred = 1;

                    } else if (ls[i].deferred_accept != nls[n].deferred_accept)
                    {
                        nls[n].add_deferred = 1;
                    }
#endif

#if (NGX_HAVE_REUSEPORT)
                    if (nls[n].reuseport && !ls[i].reuseport) {
                        nls[n].add_reuseport = 1;
                    }
#endif

                    break;
                }
            }

            if (nls[n].fd == (ngx_socket_t) -1) {
                nls[n].open = 1;
#if (NGX_HAVE_DEFERRED_ACCEPT && defined SO_ACCEPTFILTER)
                if (nls[n].accept_filter) {
                    nls[n].add_deferred = 1;
                }
#endif
#if (NGX_HAVE_DEFERRED_ACCEPT && defined TCP_DEFER_ACCEPT)
                if (nls[n].deferred_accept) {
                    nls[n].add_deferred = 1;
                }
#endif
            }
        }

    } else {
        ls = cycle->listening.elts;
        for (i = 0; i < cycle->listening.nelts; i++) {
            ls[i].open = 1;  //当前监听句柄有效,且不关闭
#if (NGX_HAVE_DEFERRED_ACCEPT && defined SO_ACCEPTFILTER)
            if (ls[i].accept_filter) {
                ls[i].add_deferred = 1;
            }
#endif
#if (NGX_HAVE_DEFERRED_ACCEPT && defined TCP_DEFER_ACCEPT)
            if (ls[i].deferred_accept) {
                ls[i].add_deferred = 1;
            }
#endif
        }
    }

    /*创建套接字,绑定并监听地址和端口*/
    if (ngx_open_listening_sockets(cycle) != NGX_OK) {
        goto failed;
    }

    if (!ngx_test_config) {
        ngx_configure_listening_sockets(cycle);  /*设置套接字属性,如rcvbuf、sndbuf*/
    }


    /* commit the new cycle configuration */

    if (!ngx_use_stderr) {
        (void) ngx_log_redirect_stderr(cycle);
    }

    pool->log = cycle->log;

    /*调用所有模块的init_module方法*/
    if (ngx_init_modules(cycle) != NGX_OK) {
        /* fatal */
        exit(1);
    }


    /* close and delete stuff that lefts from an old cycle */

    /* free the unnecessary shared memory */

    /*释放临时cycle中不再使用的共享内存*/
    opart = &old_cycle->shared_memory.part;
    oshm_zone = opart->elts;

    for (i = 0; /* void */ ; i++) {

        if (i >= opart->nelts) {
            if (opart->next == NULL) {
                goto old_shm_zone_done;
            }
            opart = opart->next;
            oshm_zone = opart->elts;
            i = 0;
        }

        part = &cycle->shared_memory.part;
        shm_zone = part->elts;

        for (n = 0; /* void */ ; n++) {

            if (n >= part->nelts) {
                if (part->next == NULL) {
                    break;
                }
                part = part->next;
                shm_zone = part->elts;
                n = 0;
            }

            /*判断共享内存是否重用*/
            if (oshm_zone[i].shm.name.len == shm_zone[n].shm.name.len
                && ngx_strncmp(oshm_zone[i].shm.name.data,
                               shm_zone[n].shm.name.data,
                               oshm_zone[i].shm.name.len)
                == 0)
            {
                goto live_shm_zone;
            }
        }

        ngx_shm_free(&oshm_zone[i].shm);

    live_shm_zone:

        continue;
    }

old_shm_zone_done:


    /* close the unnecessary listening sockets */

    /*关闭临时cycle中打开的且不重用的socket句柄*/
    ls = old_cycle->listening.elts;
    for (i = 0; i < old_cycle->listening.nelts; i++) {

        if (ls[i].remain || ls[i].fd == (ngx_socket_t) -1) {
            continue;
        }

        /*关闭socket句柄*/
        if (ngx_close_socket(ls[i].fd) == -1) {
            ngx_log_error(NGX_LOG_EMERG, log, ngx_socket_errno,
                          ngx_close_socket_n " listening socket on %V failed",
                          &ls[i].addr_text);
        }

#if (NGX_HAVE_UNIX_DOMAIN)

        if (ls[i].sockaddr->sa_family == AF_UNIX) {
            u_char  *name;

            name = ls[i].addr_text.data + sizeof("unix:") - 1;

            ngx_log_error(NGX_LOG_WARN, cycle->log, 0,
                          "deleting socket %s", name);

            if (ngx_delete_file(name) == NGX_FILE_ERROR) {
                ngx_log_error(NGX_LOG_EMERG, cycle->log, ngx_socket_errno,
                              ngx_delete_file_n " %s failed", name);
            }
        }

#endif
    }


    /* close the unnecessary open files */

    /*关闭临时cycle中打开的文件*/
    part = &old_cycle->open_files.part;
    file = part->elts;

    for (i = 0; /* void */ ; i++) {

        if (i >= part->nelts) {
            if (part->next == NULL) {
                break;
            }
            part = part->next;
            file = part->elts;
            i = 0;
        }

        if (file[i].fd == NGX_INVALID_FILE || file[i].fd == ngx_stderr) {
            continue;
        }

        /*关闭文件句柄*/
        if (ngx_close_file(file[i].fd) == NGX_FILE_ERROR) {
            ngx_log_error(NGX_LOG_EMERG, log, ngx_errno,
                          ngx_close_file_n " \"%s\" failed",
                          file[i].name.data);
        }
    }

    /*释放临时内存池*/
    ngx_destroy_pool(conf.temp_pool);

    /*如果是第一次加载,则满足ngx_is_init_cycle();如果是reload热启动,则原来的nginx的进程满足ngx_process == NGX_PROCESS_MASTER*/
    if (ngx_process == NGX_PROCESS_MASTER || ngx_is_init_cycle(old_cycle)) {

        /*
         * perl_destruct() frees environ, if it is not the same as it was at
         * perl_construct() time, therefore we save the previous cycle
         * environment before ngx_conf_parse() where it will be changed.
         */

        env = environ;
        environ = senv;

        /*释放临时cycle中的内存池*/
        ngx_destroy_pool(old_cycle->pool);
        cycle->old_cycle = NULL;

        environ = env;

        return cycle;
    }


    if (ngx_temp_pool == NULL) {
        ngx_temp_pool = ngx_create_pool(128, cycle->log);
        if (ngx_temp_pool == NULL) {
            ngx_log_error(NGX_LOG_EMERG, cycle->log, 0,
                          "could not create ngx_temp_pool");
            exit(1);
        }

        n = 10;
        ngx_old_cycles.elts = ngx_pcalloc(ngx_temp_pool,
                                          n * sizeof(ngx_cycle_t *));
        if (ngx_old_cycles.elts == NULL) {
            exit(1);
        }
        ngx_old_cycles.nelts = 0;
        ngx_old_cycles.size = sizeof(ngx_cycle_t *);
        ngx_old_cycles.nalloc = n;
        ngx_old_cycles.pool = ngx_temp_pool;

        ngx_cleaner_event.handler = ngx_clean_old_cycles;
        ngx_cleaner_event.log = cycle->log;
        ngx_cleaner_event.data = &dumb;
        dumb.fd = (ngx_socket_t) -1;
    }

    ngx_temp_pool->log = cycle->log;

    old = ngx_array_push(&ngx_old_cycles);
    if (old == NULL) {
        exit(1);
    }
    *old = old_cycle;

    if (!ngx_cleaner_event.timer_set) {
        ngx_add_timer(&ngx_cleaner_event, 30000);
        ngx_cleaner_event.timer_set = 1;
    }

    return cycle;


failed:

    if (!ngx_is_init_cycle(old_cycle)) {
        old_ccf = (ngx_core_conf_t *) ngx_get_conf(old_cycle->conf_ctx,
                                                   ngx_core_module);
        if (old_ccf->environment) {
            environ = old_ccf->environment;
        }
    }

    /* rollback the new cycle configuration */

    /*关闭打开的文件*/
    part = &cycle->open_files.part;
    file = part->elts;

    for (i = 0; /* void */ ; i++) {

        if (i >= part->nelts) {
            if (part->next == NULL) {
                break;
            }
            part = part->next;
            file = part->elts;
            i = 0;
        }

        if (file[i].fd == NGX_INVALID_FILE || file[i].fd == ngx_stderr) {
            continue;
        }

        if (ngx_close_file(file[i].fd) == NGX_FILE_ERROR) {
            ngx_log_error(NGX_LOG_EMERG, log, ngx_errno,
                          ngx_close_file_n " \"%s\" failed",
                          file[i].name.data);
        }
    }

    if (ngx_test_config) {
        ngx_destroy_cycle_pools(&conf);
        return NULL;
    }

    /*关闭打开的监听端口,为啥要关闭*/
    ls = cycle->listening.elts;
    for (i = 0; i < cycle->listening.nelts; i++) {
        if (ls[i].fd == (ngx_socket_t) -1 || !ls[i].open) {
            continue;
        }

        if (ngx_close_socket(ls[i].fd) == -1) {
            ngx_log_error(NGX_LOG_EMERG, log, ngx_socket_errno,
                          ngx_close_socket_n " %V failed",
                          &ls[i].addr_text);
        }
    }

    /*释放内存池*/
    ngx_destroy_cycle_pools(&conf);

    return NULL;
}
예제 #13
0
static ngx_int_t
ngx_http_tcache_mdb_init(ngx_http_tcache_t *cache)
{
    size_t                    len;
    u_char                   *name, *path;
    ngx_mdb_t                *mdb;
    mdb_param_t               params;

    mdb = ngx_pcalloc(cache->pool, sizeof(ngx_mdb_t));
    if (mdb == NULL) {
        return NGX_ERROR;
    }

    ngx_log_debug0(NGX_LOG_DEBUG_HTTP, cache->log, 0, "tcache mdb init");

    mdb->log = (char *) cache->log->file->name.data;
    mdb_log_file(mdb->log);
    mdb_log_level("error");

    ngx_memzero(&params, sizeof(mdb_param_t));

    len = sizeof("libmdb_") - 1 + cache->name.len;

    name = ngx_pcalloc(cache->pool, len + 1);
    if (name == NULL) {
        return NGX_ERROR;
    }

    ngx_snprintf(name, len, "%s%V", (u_char *) "libmdb_", &cache->name);

    len += sizeof("/dev/shm/") - 1;

    path = ngx_pcalloc(cache->pool, len + 1);
    if (path == NULL) {
        return NGX_ERROR;
    }

    ngx_snprintf(path, len, "/dev/shm/%s", name);

    mdb->path = (char *)path;

#if NGX_LINUX && 0
    ngx_fd_t                  fd;
    struct flock              fl;

    fd = open((char *)path, O_RDWR);
    if (fd > 0) {
        fl.l_start = 0;
        fl.l_len = 0;
        fl.l_pid = 0;
        fl.l_type = F_WRLCK;
        fl.l_whence = SEEK_SET;

        /* record lock can't inherit after fork, sucks */
        if (fcntl(fd, F_SETLK, &fl) == -1) {
            ngx_log_error(NGX_LOG_EMERG, cache->log, 0,
                          "tcache error: the shared memory \"%s\" is using",
                          name);

            return NGX_ERROR;
        }
    }
#endif

    ngx_delete_file(mdb->path);

    params.mdb_type = "mdb_shm";
    params.mdb_path = (char *) name;
    params.size = cache->size;

    mdb->db = mdb_init(&params);
    mdb->area = 0;

    mdb->quota = cache->size >> 1;

    mdb_set_quota(mdb->db, mdb->area, mdb->quota);

    cache->mdb = mdb;

    return NGX_OK;
}
static int
ngx_http_lua_ngx_cache_purge(lua_State *L) {
    int                          n;
    ngx_http_request_t          *r;
    ngx_http_cache_t            *c;
    ngx_http_file_cache_t       *cache;


    n = lua_gettop(L);

    if (n != 0) {
        return luaL_error(L, "expecting no arguments");
    }

    r = ngx_http_lua_get_request(L);
    if (!r->cache || !r->cache->node || !r->cache->node->exists
        || r->cache->node->deleting) {
        lua_pushboolean (L, 0);
        return 1;
    }
    /* Inspired by Piotr Sikora's Purge module.
     * https://github.com/FRiCKLE/ngx_cache_purge
     */
    ngx_shmtx_lock(&r->cache->file_cache->shpool->mutex);
    if (!r->cache || !r->cache->node || !r->cache->node->exists) {
        /* race between concurrent purges, backoff */
        ngx_shmtx_unlock(&r->cache->file_cache->shpool->mutex);

        lua_pushboolean (L, 0);
        return 1;
    }

    c = r->cache;
    cache = c->file_cache;

#  if defined(nginx_version) && (nginx_version >= 1000001)
    cache->sh->size -= c->node->fs_size;
    c->node->fs_size = 0;
#  else
    cache->sh->size -= (c->node->length + cache->bsize - 1) / cache->bsize;
    c->node->length = 0;
#  endif

    c->node->exists = 0;
#  if defined(nginx_version) \
      && ((nginx_version >= 8001) \
          || ((nginx_version < 8000) && (nginx_version >= 7060)))
    c->node->updating = 0;
#  endif

    ngx_shmtx_unlock(&r->cache->file_cache->shpool->mutex);

    if (ngx_delete_file(r->cache->file.name.data) == NGX_FILE_ERROR) {
        ngx_log_error(NGX_LOG_WARN, r->connection->log, ngx_errno,
                      ngx_delete_file_n " \"%s\" failed while "
                      "attempting to purge bad stale.",
                      r->cache->file.name.data);
    }

    lua_pushboolean (L, 1);
    return 1;
}
예제 #15
0
void
ngx_http_file_cache_free(ngx_http_cache_t *c, ngx_temp_file_t *tf)
{
    ngx_http_file_cache_t       *cache;
    ngx_http_file_cache_node_t  *fcn;

    if (c->updated || c->node == NULL) {
        return;
    }

    cache = c->file_cache;

    ngx_log_debug1(NGX_LOG_DEBUG_HTTP, c->file.log, 0,
                   "http file cache free, fd: %d", c->file.fd);

    ngx_shmtx_lock(&cache->shpool->mutex);

    fcn = c->node;
    fcn->count--;

    if (c->updating) {
        fcn->updating = 0;
    }

    if (c->error) {
        fcn->error = c->error;

        if (c->valid_sec) {
            fcn->valid_sec = c->valid_sec;
            fcn->valid_msec = c->valid_msec;
        }

    } else if (!fcn->exists && fcn->count == 0 && c->min_uses == 1) {
        ngx_queue_remove(&fcn->queue);
        ngx_rbtree_delete(&cache->sh->rbtree, &fcn->node);
        ngx_slab_free_locked(cache->shpool, fcn);
        c->node = NULL;
    }

    ngx_shmtx_unlock(&cache->shpool->mutex);

    c->updated = 1;
    c->updating = 0;

    if (c->temp_file) {
        if (tf && tf->file.fd != NGX_INVALID_FILE) {
            ngx_log_debug1(NGX_LOG_DEBUG_HTTP, c->file.log, 0,
                           "http file cache incomplete: \"%s\"",
                           tf->file.name.data);

            if (ngx_delete_file(tf->file.name.data) == NGX_FILE_ERROR) {
                ngx_log_error(NGX_LOG_CRIT, c->file.log, ngx_errno,
                              ngx_delete_file_n " \"%s\" failed",
                              tf->file.name.data);
            }
        }
    }

    if (c->wait_event.timer_set) {
        ngx_del_timer(&c->wait_event);
    }
}
예제 #16
0
//初始化cycle
ngx_cycle_t *
ngx_init_cycle(ngx_cycle_t *old_cycle)
{
    void                *rv;
    char               **senv, **env;
    ngx_uint_t           i, n;
    ngx_log_t           *log;
    ngx_time_t          *tp;
    ngx_conf_t           conf;//与nginx.conf配置文件相关的一个变量,配置文件的解析都是围绕这个变量进行
    ngx_pool_t          *pool;
    ngx_cycle_t         *cycle, **old;
    ngx_shm_zone_t      *shm_zone, *oshm_zone;
    ngx_list_part_t     *part, *opart;
    ngx_open_file_t     *file;
    ngx_listening_t     *ls, *nls;
    ngx_core_conf_t     *ccf, *old_ccf;
    ngx_core_module_t   *module;
    char                 hostname[NGX_MAXHOSTNAMELEN];

    ngx_timezone_update();

    /* force localtime update with a new timezone */

    tp = ngx_timeofday();  // 这个宏就是取出之前的ngx_cache_time
    tp->sec = 0;

    ngx_time_update(); //这里又进行了一次time更新


    log = old_cycle->log;

    //创建内存池,并把日志和它关联 ,创建固定大小的内存池:16384
    pool = ngx_create_pool(NGX_CYCLE_POOL_SIZE, log);
    if (pool == NULL) {
        return NULL;
    }
    pool->log = log;

    //分配内存,并把内存池、日志、旧信息以及路径进行了设置。这两段代码所的是创建一个内存池,然后在内存池上为cycle变量分配一个存储空间。
    cycle = ngx_pcalloc(pool, sizeof(ngx_cycle_t));
    if (cycle == NULL) {
        ngx_destroy_pool(pool);
        return NULL;
    }
    
    cycle->pool = pool;
    cycle->log = log;
    cycle->new_log.log_level = NGX_LOG_ERR;
    cycle->old_cycle = old_cycle;

    //配置路径的前缀
    cycle->conf_prefix.len = old_cycle->conf_prefix.len;
    cycle->conf_prefix.data = ngx_pstrdup(pool, &old_cycle->conf_prefix);
    if (cycle->conf_prefix.data == NULL) {
        ngx_destroy_pool(pool);
        return NULL;
    }
    
    //系统路径的前缀
    cycle->prefix.len = old_cycle->prefix.len;
    cycle->prefix.data = ngx_pstrdup(pool, &old_cycle->prefix);
    if (cycle->prefix.data == NULL) {
        ngx_destroy_pool(pool);
        return NULL;
    }

    //配置文件路径
    cycle->conf_file.len = old_cycle->conf_file.len;
    cycle->conf_file.data = ngx_pnalloc(pool, old_cycle->conf_file.len + 1);
    if (cycle->conf_file.data == NULL) {
        ngx_destroy_pool(pool);
        return NULL;
    }
    ngx_cpystrn(cycle->conf_file.data, old_cycle->conf_file.data,
                old_cycle->conf_file.len + 1);

    //配置参数设定
    cycle->conf_param.len = old_cycle->conf_param.len;
    cycle->conf_param.data = ngx_pstrdup(pool, &old_cycle->conf_param);
    if (cycle->conf_param.data == NULL) {
        ngx_destroy_pool(pool);
        return NULL;
    }

    //文件路径分配空间并初始化 ,如果old_cycle默认没有指定,则大小为10
    n = old_cycle->pathes.nelts ? old_cycle->pathes.nelts : 10;

    cycle->pathes.elts = ngx_pcalloc(pool, n * sizeof(ngx_path_t *));
    if (cycle->pathes.elts == NULL) {
        ngx_destroy_pool(pool);
        return NULL;
    }

    cycle->pathes.nelts = 0;
    cycle->pathes.size = sizeof(ngx_path_t *);
    cycle->pathes.nalloc = n;
    cycle->pathes.pool = pool;
    // 每个打开的文件都会放到cycle中的open_files中。每个共享内存段都会放到shared_memory链表中
    //如果原来结构中有文件,那么直接统计原来打开的文件,否则默认20
    if (old_cycle->open_files.part.nelts) {
        n = old_cycle->open_files.part.nelts;
        for (part = old_cycle->open_files.part.next; part; part = part->next) {
            n += part->nelts;
        }

    } else {
        n = 20;
    }
    
    //根据数量初始化,初始化open_files
    if (ngx_list_init(&cycle->open_files, pool, n, sizeof(ngx_open_file_t))
        != NGX_OK)
    {
        ngx_destroy_pool(pool);
        return NULL;
    }

    //如果原来结构中共享内存,那么直接统计原来共享内存数,否则默认20
    if (old_cycle->shared_memory.part.nelts) {
        n = old_cycle->shared_memory.part.nelts;
        for (part = old_cycle->shared_memory.part.next; part; part = part->next)
        {
            n += part->nelts;
        }

    } else {
        n = 1;
    }

    //根据数量初始化,初始化shared_memory
    if (ngx_list_init(&cycle->shared_memory, pool, n, sizeof(ngx_shm_zone_t))
        != NGX_OK)
    {
        ngx_destroy_pool(pool);
        return NULL;
    }

    //创建监听者,并初始化
    n = old_cycle->listening.nelts ? old_cycle->listening.nelts : 10;

    cycle->listening.elts = ngx_pcalloc(pool, n * sizeof(ngx_listening_t));
    if (cycle->listening.elts == NULL) {
        ngx_destroy_pool(pool);
        return NULL;
    }

    cycle->listening.nelts = 0;
    cycle->listening.size = sizeof(ngx_listening_t);
    cycle->listening.nalloc = n;
    cycle->listening.pool = pool;


    ngx_queue_init(&cycle->reusable_connections_queue);

    //创建所有模块配置的指针, 这里的ngx_max_module在nginx.c中计算过了
    cycle->conf_ctx = ngx_pcalloc(pool, ngx_max_module * sizeof(void *));
    if (cycle->conf_ctx == NULL) {
        ngx_destroy_pool(pool);
        return NULL;
    }

    //获取主机名,设置 hostname,这个时候hostname就是机器名,比如“yejianfeng-D1”
    if (gethostname(hostname, NGX_MAXHOSTNAMELEN) == -1) {
        ngx_log_error(NGX_LOG_EMERG, log, ngx_errno, "gethostname() failed");
        ngx_destroy_pool(pool);
        return NULL;
    }

    /* on Linux gethostname() silently truncates name that does not fit */

    hostname[NGX_MAXHOSTNAMELEN - 1] = '\0';
    cycle->hostname.len = ngx_strlen(hostname);

    cycle->hostname.data = ngx_pnalloc(pool, cycle->hostname.len);
    if (cycle->hostname.data == NULL) {
        ngx_destroy_pool(pool);
        return NULL;
    }

    ngx_strlow(cycle->hostname.data, (u_char *) hostname, cycle->hostname.len); //将主机名变为消息,所以这里主机名是不分大小写的

    //调用核心模块的配置创建函数, cycle->conf_ctx 中对应的指针指向创建的配置
    //创建所有core module的configure.它通过调用每个core module的ngx_xxx_module_create_conf方法,来创建对应的conf,
    //然后将这个conf对象保存在全局的conf_ctx中
    for (i = 0; ngx_modules[i]; i++) {
        if (ngx_modules[i]->type != NGX_CORE_MODULE) {
        	//非核心模块直接跳过
            continue;
        }
        
        //这里只对核心模块进行处理,核心模块就是ngx_core_module,ngx_errlog_module,ngx_events_module和ngx_http_module
        //实际上只有ngx_core_module_create_conf

        //得到core modules
        module = ngx_modules[i]->ctx;

        //如果create_conf存在,则直接创建config
        if (module->create_conf) {
            rv = module->create_conf(cycle); //对每个模块调用模块内部的钩子ngx_xxx_module_create_conf,当然第一个模块是core
            if (rv == NULL) {
                ngx_destroy_pool(pool);
                return NULL;
            }
            //保存config,这里看到conf_ctx里面就是放对应模块的main conf.
            cycle->conf_ctx[ngx_modules[i]->index] = rv;
        }
    }


    senv = environ;

    //对指令结构进行初始化:参数,内存池
    ngx_memzero(&conf, sizeof(ngx_conf_t));
    /* STUB: init array ? */
    conf.args = ngx_array_create(pool, 10, sizeof(ngx_str_t));
    if (conf.args == NULL) {
        ngx_destroy_pool(pool);
        return NULL;
    }

    conf.temp_pool = ngx_create_pool(NGX_CYCLE_POOL_SIZE, log);
    if (conf.temp_pool == NULL) {
        ngx_destroy_pool(pool);
        return NULL;
    }

    //指令结果赋值
    conf.ctx = cycle->conf_ctx;
    conf.cycle = cycle;
    conf.pool = pool;
    conf.log = log;
    conf.module_type = NGX_CORE_MODULE;//注意,一开始命令的类型就是MAIN,并且模块类型是core。
    conf.cmd_type = NGX_MAIN_CONF;

#if 0
    log->log_level = NGX_LOG_DEBUG_ALL;
#endif

    if (ngx_conf_param(&conf) != NGX_CONF_OK) {
        environ = senv;
        ngx_destroy_cycle_pools(&conf);
        return NULL;
    }

    //开始解析配置文件了,解析配置文件它会一行行读取,然后如果遇到指令
    //则会查找到对应的ngx_command_t对象,然后执行对应的回调set方法。这里所有动作都在ngx_conf_parse这个函数中进行.
    //这函数是立即模块的核心函数,对配置文件边解析边处理
    if (ngx_conf_parse(&conf, &cycle->conf_file) != NGX_CONF_OK) {
        environ = senv;
        ngx_destroy_cycle_pools(&conf);
        return NULL;
    }

    if (ngx_test_config && !ngx_quiet_mode) {
        ngx_log_stderr(0, "the configuration file %s syntax is ok",
                       cycle->conf_file.data);
    }

    //当配置文件解析完毕后,就初始化core module的config
    for (i = 0; ngx_modules[i]; i++) {
        if (ngx_modules[i]->type != NGX_CORE_MODULE) {
            continue;
        }

        module = ngx_modules[i]->ctx;

        //调用ngx_xxx_module_init_conf
        if (module->init_conf) {
            if (module->init_conf(cycle, cycle->conf_ctx[ngx_modules[i]->index])
                == NGX_CONF_ERROR)
            {
                environ = senv;
                ngx_destroy_cycle_pools(&conf);
                return NULL;
            }
        }
    }

    if (ngx_process == NGX_PROCESS_SIGNALLER) {
        return cycle;
    }

    ccf = (ngx_core_conf_t *) ngx_get_conf(cycle->conf_ctx, ngx_core_module);

    if (ngx_test_config) {

        if (ngx_create_pidfile(&ccf->pid, log) != NGX_OK) {
            goto failed;
        }

    } else if (!ngx_is_init_cycle(old_cycle)) {

        /*
         * we do not create the pid file in the first ngx_init_cycle() call
         * because we need to write the demonized process pid
         */

        old_ccf = (ngx_core_conf_t *) ngx_get_conf(old_cycle->conf_ctx,
                                                   ngx_core_module);
        if (ccf->pid.len != old_ccf->pid.len
            || ngx_strcmp(ccf->pid.data, old_ccf->pid.data) != 0)
        {
            /* new pid file name */

            if (ngx_create_pidfile(&ccf->pid, log) != NGX_OK) {
                goto failed;
            }

            ngx_delete_pidfile(old_cycle);
        }
    }


    if (ngx_test_lockfile(cycle->lock_file.data, log) != NGX_OK) {
        goto failed;
    }

    // 创建client_body_temp,proxy_temp,fastcgi_temp,uwsgi_temp,scgi_temp这几个目录
    if (ngx_create_pathes(cycle, ccf->user) != NGX_OK) {
        goto failed;
    }


    if (cycle->new_log.file == NULL) {
        cycle->new_log.file = ngx_conf_open_file(cycle, &error_log);
        if (cycle->new_log.file == NULL) {
            goto failed;
        }
    }

    /* open the new files */

    part = &cycle->open_files.part;
    file = part->elts;
    // 打开所有文件,这时候file里面不仅有存文件路径,而且存储了文件描述符等信息。
    for (i = 0; /* void */ ; i++) {

        if (i >= part->nelts) {
            if (part->next == NULL) {
                break;
            }
            part = part->next;
            file = part->elts;
            i = 0;
        }

        if (file[i].name.len == 0) {
            continue;
        }

        file[i].fd = ngx_open_file(file[i].name.data,
                                   NGX_FILE_APPEND,
                                   NGX_FILE_CREATE_OR_OPEN,
                                   NGX_FILE_DEFAULT_ACCESS);

        ngx_log_debug3(NGX_LOG_DEBUG_CORE, log, 0,
                       "log: %p %d \"%s\"",
                       &file[i], file[i].fd, file[i].name.data);

        if (file[i].fd == NGX_INVALID_FILE) {
            ngx_log_error(NGX_LOG_EMERG, log, ngx_errno,
                          ngx_open_file_n " \"%s\" failed",
                          file[i].name.data);
            goto failed;
        }

#if !(NGX_WIN32)
        if (fcntl(file[i].fd, F_SETFD, FD_CLOEXEC) == -1) {
            ngx_log_error(NGX_LOG_EMERG, log, ngx_errno,
                          "fcntl(FD_CLOEXEC) \"%s\" failed",
                          file[i].name.data);
            goto failed;
        }
#endif
    }

    cycle->log = &cycle->new_log;
    pool->log = &cycle->new_log;


    /* create shared memory */

    part = &cycle->shared_memory.part;
    shm_zone = part->elts;

    for (i = 0; /* void */ ; i++) {

        if (i >= part->nelts) {
            if (part->next == NULL) {
                break;
            }
            part = part->next;
            shm_zone = part->elts;
            i = 0;
        }

        if (shm_zone[i].shm.size == 0) {
            ngx_log_error(NGX_LOG_EMERG, log, 0,
                          "zero size shared memory zone \"%V\"",
                          &shm_zone[i].shm.name);
            goto failed;
        }

        shm_zone[i].shm.log = cycle->log;

        opart = &old_cycle->shared_memory.part;
        oshm_zone = opart->elts;

        for (n = 0; /* void */ ; n++) {

            if (n >= opart->nelts) {
                if (opart->next == NULL) {
                    break;
                }
                opart = opart->next;
                oshm_zone = opart->elts;
                n = 0;
            }

            if (shm_zone[i].shm.name.len != oshm_zone[n].shm.name.len) {
                continue;
            }

            if (ngx_strncmp(shm_zone[i].shm.name.data,
                            oshm_zone[n].shm.name.data,
                            shm_zone[i].shm.name.len)
                != 0)
            {
                continue;
            }

            if (shm_zone[i].shm.size == oshm_zone[n].shm.size) {
                shm_zone[i].shm.addr = oshm_zone[n].shm.addr;

                if (shm_zone[i].init(&shm_zone[i], oshm_zone[n].data)
                    != NGX_OK)
                {
                    goto failed;
                }

                goto shm_zone_found;
            }

            ngx_shm_free(&oshm_zone[n].shm);

            break;
        }
        
        //初始化所有创建的共享内存
        if (ngx_shm_alloc(&shm_zone[i].shm) != NGX_OK) {
            goto failed;
        }

        if (ngx_init_zone_pool(cycle, &shm_zone[i]) != NGX_OK) {
            goto failed;
        }

        if (shm_zone[i].init(&shm_zone[i], NULL) != NGX_OK) {
            goto failed;
        }

    shm_zone_found:

        continue;
    }


    /* handle the listening sockets */

    if (old_cycle->listening.nelts) {
        ls = old_cycle->listening.elts;
        for (i = 0; i < old_cycle->listening.nelts; i++) {
            ls[i].remain = 0;
        }

        nls = cycle->listening.elts;
        for (n = 0; n < cycle->listening.nelts; n++) {

            for (i = 0; i < old_cycle->listening.nelts; i++) {
                if (ls[i].ignore) {
                    continue;
                }

                if (ngx_cmp_sockaddr(nls[n].sockaddr, ls[i].sockaddr) == NGX_OK)
                {
                    nls[n].fd = ls[i].fd;
                    nls[n].previous = &ls[i];
                    ls[i].remain = 1;

                    if (ls[n].backlog != nls[i].backlog) {
                        nls[n].listen = 1;
                    }

#if (NGX_HAVE_DEFERRED_ACCEPT && defined SO_ACCEPTFILTER)

                    /*
                     * FreeBSD, except the most recent versions,
                     * could not remove accept filter
                     */
                    nls[n].deferred_accept = ls[i].deferred_accept;

                    if (ls[i].accept_filter && nls[n].accept_filter) {
                        if (ngx_strcmp(ls[i].accept_filter,
                                       nls[n].accept_filter)
                            != 0)
                        {
                            nls[n].delete_deferred = 1;
                            nls[n].add_deferred = 1;
                        }

                    } else if (ls[i].accept_filter) {
                        nls[n].delete_deferred = 1;

                    } else if (nls[n].accept_filter) {
                        nls[n].add_deferred = 1;
                    }
#endif

#if (NGX_HAVE_DEFERRED_ACCEPT && defined TCP_DEFER_ACCEPT)

                    if (ls[n].deferred_accept && !nls[n].deferred_accept) {
                        nls[n].delete_deferred = 1;

                    } else if (ls[i].deferred_accept != nls[n].deferred_accept)
                    {
                        nls[n].add_deferred = 1;
                    }
#endif
                    break;
                }
            }

            if (nls[n].fd == -1) {
                nls[n].open = 1;
            }
        }

    } else {
        ls = cycle->listening.elts;
        for (i = 0; i < cycle->listening.nelts; i++) {
            ls[i].open = 1;
#if (NGX_HAVE_DEFERRED_ACCEPT && defined SO_ACCEPTFILTER)
            if (ls[i].accept_filter) {
                ls[i].add_deferred = 1;
            }
#endif
#if (NGX_HAVE_DEFERRED_ACCEPT && defined TCP_DEFER_ACCEPT)
            if (ls[i].deferred_accept) {
                ls[i].add_deferred = 1;
            }
#endif
        }
    }

    //listen socket的初始化,创建并bind等操作, 打开所有的监听套接口(依次进行socket,bind,listen)
    if (ngx_open_listening_sockets(cycle) != NGX_OK) {
        goto failed;
    }

    if (!ngx_test_config) {
        ngx_configure_listening_sockets(cycle);
    }


    /* commit the new cycle configuration */

    if (!ngx_use_stderr && cycle->log->file->fd != ngx_stderr) {

        if (ngx_set_stderr(cycle->log->file->fd) == NGX_FILE_ERROR) {
            ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
                          ngx_set_stderr_n " failed");
        }
    }

    pool->log = cycle->log;

    //调用init_module对所有的模块进行初始化,调用所有模块的ngx_XXX_module_init钩子,比如ngx_event_module_init
    for (i = 0; ngx_modules[i]; i++) {
        if (ngx_modules[i]->init_module) {
            if (ngx_modules[i]->init_module(cycle) != NGX_OK) {
                /* fatal */
                exit(1);
            }
        }
    }


    /* close and delete stuff that lefts from an old cycle */
    // 关闭或删除残留在old_cycle中的资源
    /* free the unnecessary shared memory */

    opart = &old_cycle->shared_memory.part;
    oshm_zone = opart->elts;

    for (i = 0; /* void */ ; i++) {

        if (i >= opart->nelts) {
            if (opart->next == NULL) {
                goto old_shm_zone_done;
            }
            opart = opart->next;
            oshm_zone = opart->elts;
            i = 0;
        }

        part = &cycle->shared_memory.part;
        shm_zone = part->elts;

        for (n = 0; /* void */ ; n++) {

            if (n >= part->nelts) {
                if (part->next == NULL) {
                    break;
                }
                part = part->next;
                shm_zone = part->elts;
                n = 0;
            }

            if (oshm_zone[i].shm.name.len == shm_zone[n].shm.name.len
                && ngx_strncmp(oshm_zone[i].shm.name.data,
                               shm_zone[n].shm.name.data,
                               oshm_zone[i].shm.name.len)
                == 0)
            {
                goto live_shm_zone;
            }
        }

        ngx_shm_free(&oshm_zone[i].shm);

    live_shm_zone:

        continue;
    }

old_shm_zone_done:


    /* close the unnecessary listening sockets */

    ls = old_cycle->listening.elts;
    for (i = 0; i < old_cycle->listening.nelts; i++) {

        if (ls[i].remain || ls[i].fd == -1) {
            continue;
        }

        if (ngx_close_socket(ls[i].fd) == -1) {
            ngx_log_error(NGX_LOG_EMERG, log, ngx_socket_errno,
                          ngx_close_socket_n " listening socket on %V failed",
                          &ls[i].addr_text);
        }

#if (NGX_HAVE_UNIX_DOMAIN)

        if (ls[i].sockaddr->sa_family == AF_UNIX) {
            u_char  *name;

            name = ls[i].addr_text.data + sizeof("unix:") - 1;

            ngx_log_error(NGX_LOG_WARN, cycle->log, 0,
                          "deleting socket %s", name);

            if (ngx_delete_file(name) == -1) {
                ngx_log_error(NGX_LOG_EMERG, cycle->log, ngx_socket_errno,
                              ngx_delete_file_n " %s failed", name);
            }
        }

#endif
    }


    /* close the unnecessary open files */

    part = &old_cycle->open_files.part;
    file = part->elts;

    for (i = 0; /* void */ ; i++) {

        if (i >= part->nelts) {
            if (part->next == NULL) {
                break;
            }
            part = part->next;
            file = part->elts;
            i = 0;
        }

        if (file[i].fd == NGX_INVALID_FILE || file[i].fd == ngx_stderr) {
            continue;
        }

        if (ngx_close_file(file[i].fd) == NGX_FILE_ERROR) {
            ngx_log_error(NGX_LOG_EMERG, log, ngx_errno,
                          ngx_close_file_n " \"%s\" failed",
                          file[i].name.data);
        }
    }

    ngx_destroy_pool(conf.temp_pool);

    if (ngx_process == NGX_PROCESS_MASTER || ngx_is_init_cycle(old_cycle)) {

        /*
         * perl_destruct() frees environ, if it is not the same as it was at
         * perl_construct() time, therefore we save the previous cycle
         * environment before ngx_conf_parse() where it will be changed.
         */

        env = environ;
        environ = senv;

        ngx_destroy_pool(old_cycle->pool);
        cycle->old_cycle = NULL;

        environ = env;

        return cycle;
    }


    if (ngx_temp_pool == NULL) {
        ngx_temp_pool = ngx_create_pool(128, cycle->log);
        if (ngx_temp_pool == NULL) {
            ngx_log_error(NGX_LOG_EMERG, cycle->log, 0,
                          "could not create ngx_temp_pool");
            exit(1);
        }

        n = 10;
        ngx_old_cycles.elts = ngx_pcalloc(ngx_temp_pool,
                                          n * sizeof(ngx_cycle_t *));
        if (ngx_old_cycles.elts == NULL) {
            exit(1);
        }
        ngx_old_cycles.nelts = 0;
        ngx_old_cycles.size = sizeof(ngx_cycle_t *);
        ngx_old_cycles.nalloc = n;
        ngx_old_cycles.pool = ngx_temp_pool;

        ngx_cleaner_event.handler = ngx_clean_old_cycles;
        ngx_cleaner_event.log = cycle->log;
        ngx_cleaner_event.data = &dumb;
        dumb.fd = (ngx_socket_t) -1;
    }

    ngx_temp_pool->log = cycle->log;

    old = ngx_array_push(&ngx_old_cycles);
    if (old == NULL) {
        exit(1);
    }
    *old = old_cycle;

    if (!ngx_cleaner_event.timer_set) {
        ngx_add_timer(&ngx_cleaner_event, 30000);
        ngx_cleaner_event.timer_set = 1;
    }

    return cycle;


failed:

    if (!ngx_is_init_cycle(old_cycle)) {
        old_ccf = (ngx_core_conf_t *) ngx_get_conf(old_cycle->conf_ctx,
                                                   ngx_core_module);
        if (old_ccf->environment) {
            environ = old_ccf->environment;
        }
    }

    /* rollback the new cycle configuration */

    part = &cycle->open_files.part;
    file = part->elts;

    for (i = 0; /* void */ ; i++) {

        if (i >= part->nelts) {
            if (part->next == NULL) {
                break;
            }
            part = part->next;
            file = part->elts;
            i = 0;
        }

        if (file[i].fd == NGX_INVALID_FILE || file[i].fd == ngx_stderr) {
            continue;
        }

        if (ngx_close_file(file[i].fd) == NGX_FILE_ERROR) {
            ngx_log_error(NGX_LOG_EMERG, log, ngx_errno,
                          ngx_close_file_n " \"%s\" failed",
                          file[i].name.data);
        }
    }

    if (ngx_test_config) {
        ngx_destroy_cycle_pools(&conf);
        return NULL;
    }

    ls = cycle->listening.elts;
    for (i = 0; i < cycle->listening.nelts; i++) {
        if (ls[i].fd == -1 || !ls[i].open) {
            continue;
        }

        if (ngx_close_socket(ls[i].fd) == -1) {
            ngx_log_error(NGX_LOG_EMERG, log, ngx_socket_errno,
                          ngx_close_socket_n " %V failed",
                          &ls[i].addr_text);
        }
    }

    ngx_destroy_cycle_pools(&conf);

    return NULL;
}