static void
ngx_http_video_thumbextractor_exit_worker(ngx_cycle_t *cycle)
{
ngx_uint_t i;
for (i = 0; i < NGX_MAX_PROCESSES; i++) {
if (ngx_http_video_thumbextractor_module_ipc_ctxs[i].pid != -1) {
ngx_close_socket(ngx_http_video_thumbextractor_module_ipc_ctxs[i].pipefd[0]);
ngx_close_socket(ngx_http_video_thumbextractor_module_ipc_ctxs[i].pipefd[1]);
kill(ngx_http_video_thumbextractor_module_ipc_ctxs[i].pid, SIGTERM);
}
}
}
// 发生了错误，关闭一个连接
static void
ngx_close_accepted_connection(ngx_connection_t *c)
{
ngx_socket_t fd;
// 释放连接，加入空闲链表
// in core/ngx_connection.c
ngx_free_connection(c);
// 连接的描述符置为无效
fd = c->fd;
c->fd = (ngx_socket_t) -1;
// 关闭socket
if (!c->shared && ngx_close_socket(fd) == -1) {
ngx_log_error(NGX_LOG_ALERT, c->log, ngx_socket_errno,
ngx_close_socket_n " failed");
}
// 释放连接相关的所有内存
if (c->pool) {
ngx_destroy_pool(c->pool);
}
#if (NGX_STAT_STUB)
(void) ngx_atomic_fetch_add(ngx_stat_active, -1);
#endif
}
static void ngx_clean_nlog_sock(void* data)
{
ngx_log_t *log;
log = data;
if (log->fd != -1) {
ngx_close_socket(log->fd);
}
}
static void ngx_imap_proxy_close_session(ngx_imap_session_t *s)
{
if (ngx_close_socket(s->proxy->upstream.connection->fd) == -1) {
ngx_log_error(NGX_LOG_ALERT, s->connection->log, ngx_socket_errno,
ngx_close_socket_n " failed");
}
ngx_imap_close_connection(s->connection);
}
void ngx_close_listening_sockets(ngx_cycle_t *cycle)
{
ngx_uint_t i;
ngx_socket_t fd;
ngx_listening_t *ls;
if (ngx_event_flags & NGX_USE_IOCP_EVENT)
{
return;
}
ngx_accept_mutex_held = 0;
ngx_accept_mutex = NULL;
ls = cycle->listening.elts;
for (i = 0; i < cycle->listening.nelts; i++)
{
fd = ls[i].fd;
#if (WIN32)
/*
* Winsock assignes a socket number divisible by 4
* so to find a connection we divide a socket number by 4.
*/
fd /= 4;
#endif
if (ngx_event_flags & NGX_USE_RTSIG_EVENT)
{
if (cycle->connections[fd].read->active)
{
ngx_del_conn(&cycle->connections[fd], NGX_CLOSE_EVENT);
}
}
else
{
if (cycle->read_events[fd].active)
{
ngx_del_event(&cycle->read_events[fd],
NGX_READ_EVENT, NGX_CLOSE_EVENT);
}
}
if (ngx_close_socket(ls[i].fd) == -1)
{
ngx_log_error(NGX_LOG_EMERG, cycle->log, ngx_socket_errno,
ngx_close_socket_n " %s failed",
ls[i].addr_text.data);
}
cycle->connections[fd].fd = (ngx_socket_t) -1;
}
}
static void
ngx_proc_send_exit_process(ngx_cycle_t *cycle)
{
ngx_proc_send_conf_t *pbcf;
pbcf = ngx_proc_get_conf(cycle->conf_ctx, ngx_proc_send_module);
ngx_close_socket(pbcf->fd);
munmap(read_write_mmap, sizeof(long)*3);
munmap(write_file, pbcf->mmap_dat_size);
}
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->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);
}
}
}
static void
ngx_close_posted_connection(ngx_connection_t *c)
{
ngx_socket_t fd;
ngx_free_connection(c);
fd = c->fd;
c->fd = (ngx_socket_t) - 1;
if (ngx_close_socket(fd) == -1)
{
ngx_log_error(NGX_LOG_ALERT, c->log, ngx_socket_errno,
ngx_close_socket_n " failed");
}
if (c->pool)
{
ngx_destroy_pool(c->pool);
}
}
static int
ngx_tcp_lua_nlog_destroy(lua_State *L)
{
ngx_socket_t *u;
ngx_socket_t s;
u = lua_touserdata(L, 1);
if (u == NULL) {
return 0;
}
s = *u;
if (s == -1) {
return 0;
}
ngx_close_socket(s);
*u = -1;
return 0;
}
static void
ngx_proc_send_accept(ngx_event_t *ev)
{
u_char sa[NGX_SOCKADDRLEN];
socklen_t socklen;
ngx_socket_t s;
ngx_connection_t *lc;
lc = ev->data;
s = accept(lc->fd, (struct sockaddr *) sa, &socklen);
if (s == -1) {
return;
}
if (ngx_nonblocking(s) == -1) {
goto finish;
}
finish:
ngx_close_socket(s);
}
static void ngx_http_authen_pass_do(const struct sockaddr_in *sa, const char *address, ngx_http_request_t *r)
{
int nsend, nrecv, msglen;
int sockfd;
socklen_t salen;
char buf[NGX_HTTP_AUTHEN_BUF_MAX];
salen = sizeof(struct sockaddr_in);
sockfd = ngx_socket(AF_INET, SOCK_DGRAM, 0);
if (sockfd < 0) {
ngx_log_error(NGX_LOG_ALERT, r->connection->log, ngx_socket_errno, ngx_socket_n " failed");
ngx_log_stderr(NGX_OK, "socket() failed");
return;
}
memset(buf, 0, sizeof(buf));
msglen = sprintf(buf, "PASS %s", address);
nsend = sendto(sockfd, buf, msglen, 0, (struct sockaddr *)sa, salen);
if (nsend != msglen) {
ngx_log_stderr(NGX_OK, "sendto() failed: %d", nsend);
goto out;
}
memset(buf, 0, sizeof(buf));
nrecv = recvfrom(sockfd, buf, NGX_HTTP_AUTHEN_BUF_MAX - 1, 0, NULL, NULL);
if (nrecv < 0) {
ngx_log_stderr(NGX_OK, "recvfrom() failed: %d", nrecv);
goto out;
}
if (strncmp(buf, "OK", 2) != 0) {
ngx_log_stderr(NGX_OK, "authen failed: %s", buf);
goto out;
}
out:
ngx_close_socket(sockfd);
return;
}
static ngx_int_t
ngx_open_log_connection(ngx_syslog_t *task)
{
size_t len;
ngx_socket_t fd;
fd = ngx_socket(task->addr.sockaddr->sa_family, SOCK_DGRAM, 0);
if (fd == -1) {
goto err;
}
len = 0;
setsockopt(fd, SOL_SOCKET, SO_RCVBUF, &len, sizeof(len));
if (ngx_nonblocking(fd) == -1) {
goto err;
}
if (connect(fd, task->addr.sockaddr, task->addr.socklen) == -1) {
goto err;
}
shutdown(fd, SHUT_RD);
task->fd = fd;
return NGX_OK;
err:
if (fd != -1) {
ngx_close_socket(fd);
}
task->next_try = ngx_cached_time->sec + ngx_syslog_retry_interval;
return NGX_DECLINED;
}
static void
ngx_close_accepted_connection(ngx_connection_t *c)
{
ngx_socket_t fd;
ngx_free_connection(c);
fd = c->fd;
c->fd = (ngx_socket_t) -1;
if (ngx_close_socket(fd) == -1) {
ngx_log_error(NGX_LOG_ALERT, c->log, ngx_socket_errno,
ngx_close_socket_n " failed");
}
if (c->pool) {
ngx_destroy_pool(c->pool);
}
#if (NGX_STAT_STUB)
(void) ngx_atomic_fetch_add(ngx_stat_active, -1);
#endif
}
void
ngx_event_accept(ngx_event_t *ev)
{
socklen_t socklen;
ngx_err_t err;
ngx_log_t *log;
ngx_socket_t s;
ngx_event_t *rev, *wev;
ngx_listening_t *ls;
ngx_connection_t *c, *lc;
ngx_event_conf_t *ecf;
u_char sa[NGX_SOCKADDRLEN];
ecf = ngx_event_get_conf(ngx_cycle->conf_ctx, ngx_event_core_module);
if (ngx_event_flags & NGX_USE_RTSIG_EVENT) {
ev->available = 1;
} else if (!(ngx_event_flags & NGX_USE_KQUEUE_EVENT)) {
ev->available = ecf->multi_accept;
}
lc = ev->data;
ls = lc->listening;
ev->ready = 0;
ngx_log_debug2(NGX_LOG_DEBUG_EVENT, ev->log, 0,
"accept on %V, ready: %d", &ls->addr_text, ev->available);
do {
socklen = NGX_SOCKADDRLEN;
s = accept(lc->fd, (struct sockaddr *) sa, &socklen);
if (s == -1) {
err = ngx_socket_errno;
if (err == NGX_EAGAIN) {
ngx_log_debug0(NGX_LOG_DEBUG_EVENT, ev->log, err,
"accept() not ready");
return;
}
ngx_log_error((ngx_uint_t) ((err == NGX_ECONNABORTED) ?
NGX_LOG_ERR : NGX_LOG_ALERT),
ev->log, err, "accept() failed");
if (err == NGX_ECONNABORTED) {
if (ngx_event_flags & NGX_USE_KQUEUE_EVENT) {
ev->available--;
}
if (ev->available) {
continue;
}
}
return;
}
#if (NGX_STAT_STUB)
(void) ngx_atomic_fetch_add(ngx_stat_accepted, 1);
#endif
ngx_accept_disabled = ngx_cycle->connection_n / 8
- ngx_cycle->free_connection_n;
c = ngx_get_connection(s, ev->log);
if (c == NULL) {
if (ngx_close_socket(s) == -1) {
ngx_log_error(NGX_LOG_ALERT, ev->log, ngx_socket_errno,
ngx_close_socket_n " failed");
}
return;
}
#if (NGX_STAT_STUB)
(void) ngx_atomic_fetch_add(ngx_stat_active, 1);
#endif
c->pool = ngx_create_pool(ls->pool_size, ev->log);
if (c->pool == NULL) {
ngx_close_accepted_connection(c);
return;
}
c->sockaddr = ngx_palloc(c->pool, socklen);
if (c->sockaddr == NULL) {
ngx_close_accepted_connection(c);
return;
}
ngx_memcpy(c->sockaddr, sa, socklen);
log = ngx_palloc(c->pool, sizeof(ngx_log_t));
if (log == NULL) {
ngx_close_accepted_connection(c);
return;
}
/* set a blocking mode for aio and non-blocking mode for others */
if (ngx_inherited_nonblocking) {
if (ngx_event_flags & NGX_USE_AIO_EVENT) {
if (ngx_blocking(s) == -1) {
ngx_log_error(NGX_LOG_ALERT, ev->log, ngx_socket_errno,
ngx_blocking_n " failed");
ngx_close_accepted_connection(c);
return;
}
}
} else {
if (!(ngx_event_flags & (NGX_USE_AIO_EVENT|NGX_USE_RTSIG_EVENT))) {
if (ngx_nonblocking(s) == -1) {
ngx_log_error(NGX_LOG_ALERT, ev->log, ngx_socket_errno,
ngx_nonblocking_n " failed");
ngx_close_accepted_connection(c);
return;
}
}
}
*log = ls->log;
c->recv = ngx_recv;
c->send = ngx_send;
c->recv_chain = ngx_recv_chain;
c->send_chain = ngx_send_chain;
c->log = log;
c->pool->log = log;
c->socklen = socklen;
c->listening = ls;
c->local_sockaddr = ls->sockaddr;
c->unexpected_eof = 1;
#if (NGX_HAVE_UNIX_DOMAIN)
if (c->sockaddr->sa_family == AF_UNIX) {
c->tcp_nopush = NGX_TCP_NOPUSH_DISABLED;
c->tcp_nodelay = NGX_TCP_NODELAY_DISABLED;
#if (NGX_SOLARIS)
/* Solaris's sendfilev() supports AF_NCA, AF_INET, and AF_INET6 */
c->sendfile = 0;
#endif
}
#endif
rev = c->read;
wev = c->write;
wev->ready = 1;
if (ngx_event_flags & (NGX_USE_AIO_EVENT|NGX_USE_RTSIG_EVENT)) {
/* rtsig, aio, iocp */
rev->ready = 1;
}
if (ev->deferred_accept) {
rev->ready = 1;
#if (NGX_HAVE_KQUEUE)
rev->available = 1;
#endif
}
rev->log = log;
wev->log = log;
/*
* TODO: MT: - ngx_atomic_fetch_add()
* or protection by critical section or light mutex
*
* TODO: MP: - allocated in a shared memory
* - ngx_atomic_fetch_add()
* or protection by critical section or light mutex
*/
c->number = ngx_atomic_fetch_add(ngx_connection_counter, 1);
#if (NGX_STAT_STUB)
(void) ngx_atomic_fetch_add(ngx_stat_handled, 1);
#endif
#if (NGX_THREADS)
rev->lock = &c->lock;
wev->lock = &c->lock;
rev->own_lock = &c->lock;
wev->own_lock = &c->lock;
#endif
if (ls->addr_ntop) {
c->addr_text.data = ngx_pnalloc(c->pool, ls->addr_text_max_len);
if (c->addr_text.data == NULL) {
ngx_close_accepted_connection(c);
return;
}
c->addr_text.len = ngx_sock_ntop(c->sockaddr, c->addr_text.data,
ls->addr_text_max_len, 0);
if (c->addr_text.len == 0) {
ngx_close_accepted_connection(c);
return;
}
}
#if (NGX_DEBUG)
{
in_addr_t i;
ngx_event_debug_t *dc;
struct sockaddr_in *sin;
sin = (struct sockaddr_in *) sa;
dc = ecf->debug_connection.elts;
for (i = 0; i < ecf->debug_connection.nelts; i++) {
if ((sin->sin_addr.s_addr & dc[i].mask) == dc[i].addr) {
log->log_level = NGX_LOG_DEBUG_CONNECTION|NGX_LOG_DEBUG_ALL;
break;
}
}
}
#endif
ngx_log_debug3(NGX_LOG_DEBUG_EVENT, log, 0,
"*%d accept: %V fd:%d", c->number, &c->addr_text, s);
if (ngx_add_conn && (ngx_event_flags & NGX_USE_EPOLL_EVENT) == 0) {
if (ngx_add_conn(c) == NGX_ERROR) {
ngx_close_accepted_connection(c);
return;
}
}
log->data = NULL;
log->handler = NULL;
ls->handler(c);
if (ngx_event_flags & NGX_USE_KQUEUE_EVENT) {
ev->available--;
}
} while (ev->available);
}
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;
}
ngx_rtmp_auto_push_module.ctx_index = ngx_rtmp_core_module.ctx_index;
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_stream_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 */
}
static ngx_int_t
ngx_http_lua_udp_connect(ngx_udp_connection_t *uc)
{
int rc;
ngx_int_t event;
ngx_event_t *rev, *wev;
ngx_socket_t s;
ngx_connection_t *c;
s = ngx_socket(uc->sockaddr->sa_family, SOCK_DGRAM, 0);
ngx_log_debug1(NGX_LOG_DEBUG_EVENT, &uc->log, 0, "UDP socket %d", s);
if (s == -1) {
ngx_log_error(NGX_LOG_ALERT, &uc->log, ngx_socket_errno,
ngx_socket_n " failed");
return NGX_ERROR;
}
c = ngx_get_connection(s, &uc->log);
if (c == NULL) {
if (ngx_close_socket(s) == -1) {
ngx_log_error(NGX_LOG_ALERT, &uc->log, ngx_socket_errno,
ngx_close_socket_n "failed");
}
return NGX_ERROR;
}
if (ngx_nonblocking(s) == -1) {
ngx_log_error(NGX_LOG_ALERT, &uc->log, ngx_socket_errno,
ngx_nonblocking_n " failed");
ngx_free_connection(c);
if (ngx_close_socket(s) == -1) {
ngx_log_error(NGX_LOG_ALERT, &uc->log, ngx_socket_errno,
ngx_close_socket_n " failed");
}
return NGX_ERROR;
}
rev = c->read;
wev = c->write;
rev->log = &uc->log;
wev->log = &uc->log;
uc->connection = c;
c->number = ngx_atomic_fetch_add(ngx_connection_counter, 1);
#if (NGX_THREADS)
/* TODO: lock event when call completion handler */
rev->lock = &c->lock;
wev->lock = &c->lock;
rev->own_lock = &c->lock;
wev->own_lock = &c->lock;
#endif
#if (NGX_HTTP_LUA_HAVE_SO_PASSCRED)
if (uc->sockaddr->sa_family == AF_UNIX) {
struct sockaddr addr;
addr.sa_family = AF_UNIX;
/* just to make valgrind happy */
ngx_memzero(addr.sa_data, sizeof(addr.sa_data));
ngx_log_debug0(NGX_LOG_DEBUG_EVENT, &uc->log, 0, "datagram unix "
"domain socket autobind");
if (bind(uc->connection->fd, &addr, sizeof(sa_family_t)) != 0) {
ngx_log_error(NGX_LOG_CRIT, &uc->log, ngx_socket_errno,
"bind() failed");
return NGX_ERROR;
}
}
#endif
ngx_log_debug3(NGX_LOG_DEBUG_EVENT, &uc->log, 0,
"connect to %V, fd:%d #%d", &uc->server, s, c->number);
rc = connect(s, uc->sockaddr, uc->socklen);
/* TODO: aio, iocp */
if (rc == -1) {
ngx_log_error(NGX_LOG_CRIT, &uc->log, ngx_socket_errno,
"connect() failed");
return NGX_ERROR;
}
/* UDP sockets are always ready to write */
wev->ready = 1;
if (ngx_add_event) {
event = (ngx_event_flags & NGX_USE_CLEAR_EVENT) ?
/* kqueue, epoll */ NGX_CLEAR_EVENT:
/* select, poll, /dev/poll */ NGX_LEVEL_EVENT;
/* eventport event type has no meaning: oneshot only */
if (ngx_add_event(rev, NGX_READ_EVENT, event) != NGX_OK) {
return NGX_ERROR;
}
} else {
/* rtsig */
if (ngx_add_conn(c) == NGX_ERROR) {
return NGX_ERROR;
}
}
return NGX_OK;
}
void
ngx_close_connection(ngx_connection_t *c)
{
ngx_err_t err;
ngx_uint_t log_error, level;
ngx_socket_t fd;
if (c->fd == (ngx_socket_t) -1) {
ngx_log_error(NGX_LOG_ALERT, c->log, 0, "connection already closed");
return;
}
if (c->read->timer_set) {
ngx_del_timer(c->read);
}
if (c->write->timer_set) {
ngx_del_timer(c->write);
}
if (!c->shared) {
if (ngx_del_conn) {
ngx_del_conn(c, NGX_CLOSE_EVENT);
} else {
if (c->read->active || c->read->disabled) {
ngx_del_event(c->read, NGX_READ_EVENT, NGX_CLOSE_EVENT);
}
if (c->write->active || c->write->disabled) {
ngx_del_event(c->write, NGX_WRITE_EVENT, NGX_CLOSE_EVENT);
}
}
}
if (c->read->posted) {
ngx_delete_posted_event(c->read);
}
if (c->write->posted) {
ngx_delete_posted_event(c->write);
}
c->read->closed = 1;
c->write->closed = 1;
ngx_reusable_connection(c, 0);
log_error = c->log_error;
ngx_free_connection(c);
fd = c->fd;
c->fd = (ngx_socket_t) -1;
if (c->shared) {
return;
}
if (ngx_close_socket(fd) == -1) {
err = ngx_socket_errno;
if (err == NGX_ECONNRESET || err == NGX_ENOTCONN) {
switch (log_error) {
case NGX_ERROR_INFO:
level = NGX_LOG_INFO;
break;
case NGX_ERROR_ERR:
level = NGX_LOG_ERR;
break;
default:
level = NGX_LOG_CRIT;
}
} else {
level = NGX_LOG_CRIT;
}
ngx_log_error(level, c->log, err, ngx_close_socket_n " %d failed", fd);
}
}
ngx_int_t
ngx_event_connect_peer(ngx_peer_connection_t *pc)
{ //Here,we initilize a connection!!!
int rc;
ngx_int_t event;
ngx_err_t err;
ngx_uint_t level;
ngx_socket_t s;
ngx_event_t *rev, *wev;
ngx_connection_t *c;
//Here,very important, this handler is use to get a select handler!!
/*
For ip_hash module,will set the get handler!!!
r->upstream->peer.get = ngx_http_upstream_get_round_robin_peer;
r->upstream->peer.free = ngx_http_upstream_free_round_robin_peer;
*/
//will stored the really backend ip_addr in the pc!!
rc = pc->get(pc, pc->data);
if (rc != NGX_OK) {
return rc;
}
//Here,Do the socket operation! alloc a socket_fd
s = ngx_socket(pc->sockaddr->sa_family, SOCK_STREAM, 0);
ngx_log_debug1(NGX_LOG_DEBUG_EVENT, pc->log, 0, "socket %d", s);
if (s == -1) {
ngx_log_error(NGX_LOG_ALERT, pc->log, ngx_socket_errno,
ngx_socket_n " failed");
return NGX_ERROR;
}
c = ngx_get_connection(s, pc->log);
if (c == NULL) {
if (ngx_close_socket(s) == -1) {
ngx_log_error(NGX_LOG_ALERT, pc->log, ngx_socket_errno,
ngx_close_socket_n "failed");
}
return NGX_ERROR;
}
if (pc->rcvbuf) {
if (setsockopt(s, SOL_SOCKET, SO_RCVBUF,
(const void *) &pc->rcvbuf, sizeof(int)) == -1)
{
ngx_log_error(NGX_LOG_ALERT, pc->log, ngx_socket_errno,
"setsockopt(SO_RCVBUF) failed");
goto failed;
}
}
if (ngx_nonblocking(s) == -1) {
ngx_log_error(NGX_LOG_ALERT, pc->log, ngx_socket_errno,
ngx_nonblocking_n " failed");
goto failed;
}
if (pc->local) {
if (bind(s, pc->local->sockaddr, pc->local->socklen) == -1) {
ngx_log_error(NGX_LOG_CRIT, pc->log, ngx_socket_errno,
"bind(%V) failed", &pc->local->name);
goto failed;
}
}
//########################### Here set the connection data's read write handler!!!
c->recv = ngx_recv;
c->send = ngx_send;
c->recv_chain = ngx_recv_chain;
c->send_chain = ngx_send_chain;
c->sendfile = 1;
c->log_error = pc->log_error;
if (pc->sockaddr->sa_family != AF_INET) {
c->tcp_nopush = NGX_TCP_NOPUSH_DISABLED;
c->tcp_nodelay = NGX_TCP_NODELAY_DISABLED;
#if (NGX_SOLARIS)
/* Solaris's sendfilev() supports AF_NCA, AF_INET, and AF_INET6 */
c->sendfile = 0;
#endif
}
rev = c->read;
wev = c->write;
rev->log = pc->log;
wev->log = pc->log;
pc->connection = c;
c->number = ngx_atomic_fetch_add(ngx_connection_counter, 1);
#if (NGX_THREADS)
/* TODO: lock event when call completion handler */
rev->lock = pc->lock;
wev->lock = pc->lock;
rev->own_lock = &c->lock;
wev->own_lock = &c->lock;
#endif
if (ngx_add_conn) {
if (ngx_add_conn(c) == NGX_ERROR) {
goto failed;
}
}
ngx_log_debug3(NGX_LOG_DEBUG_EVENT, pc->log, 0,
"connect to %V, fd:%d #%d", pc->name, s, c->number);
//########################## Here,doing the really connect operation
rc = connect(s, pc->sockaddr, pc->socklen);
if (rc == -1) {
err = ngx_socket_errno;
if (err != NGX_EINPROGRESS
#if (NGX_WIN32)
/* Winsock returns WSAEWOULDBLOCK (NGX_EAGAIN) */
&& err != NGX_EAGAIN
#endif
)
{
if (err == NGX_ECONNREFUSED
#if (NGX_LINUX)
/*
* Linux returns EAGAIN instead of ECONNREFUSED
* for unix sockets if listen queue is full
*/
|| err == NGX_EAGAIN
#endif
|| err == NGX_ECONNRESET
|| err == NGX_ENETDOWN
|| err == NGX_ENETUNREACH
|| err == NGX_EHOSTDOWN
|| err == NGX_EHOSTUNREACH)
{
level = NGX_LOG_ERR;
} else {
level = NGX_LOG_CRIT;
}
ngx_log_error(level, c->log, err, "connect() to %V failed",
pc->name);
return NGX_DECLINED;
}
}
if (ngx_add_conn) {
if (rc == -1) {
/* NGX_EINPROGRESS */
return NGX_AGAIN;
}
ngx_log_debug0(NGX_LOG_DEBUG_EVENT, pc->log, 0, "connected");
wev->ready = 1;//
return NGX_OK;
}
if (ngx_event_flags & NGX_USE_AIO_EVENT) {
ngx_log_debug1(NGX_LOG_DEBUG_EVENT, pc->log, ngx_socket_errno,
"connect(): %d", rc);
/* aio, iocp */
if (ngx_blocking(s) == -1) {
ngx_log_error(NGX_LOG_ALERT, pc->log, ngx_socket_errno,
ngx_blocking_n " failed");
goto failed;
}
/*
* FreeBSD's aio allows to post an operation on non-connected socket.
* NT does not support it.
*
* TODO: check in Win32, etc. As workaround we can use NGX_ONESHOT_EVENT
*/
rev->ready = 1;
wev->ready = 1;
return NGX_OK;
}
if (ngx_event_flags & NGX_USE_CLEAR_EVENT) {
/* kqueue */
event = NGX_CLEAR_EVENT;
} else {
/* select, poll, /dev/poll */
event = NGX_LEVEL_EVENT;
}
//##########################################Very important!
//##########################################add the connection read event!!
if (ngx_add_event(rev, NGX_READ_EVENT, event) != NGX_OK) {
goto failed;
}
if (rc == -1) {
/* NGX_EINPROGRESS */
if (ngx_add_event(wev, NGX_WRITE_EVENT, event) != NGX_OK) {
goto failed;
}
return NGX_AGAIN;
}
ngx_log_debug0(NGX_LOG_DEBUG_EVENT, pc->log, 0, "connected");
wev->ready = 1; //Means the connection is ready to write!
return NGX_OK;
failed:
ngx_free_connection(c);
if (ngx_close_socket(s) == -1) {
ngx_log_error(NGX_LOG_ALERT, pc->log, ngx_socket_errno,
ngx_close_socket_n " failed");
}
return NGX_ERROR;
}
static ngx_int_t
ngx_send_radius_request( ngx_http_request_t *r, radius_req_queue_node_t* prev_req ) {
ngx_log_error( NGX_LOG_ERR, r->connection->log, 0, "ngx_send_radius_request 0x%xl", r );
ngx_http_auth_radius_main_conf_t* conf = ngx_http_get_module_main_conf( r, ngx_http_auth_radius_module );
ngx_http_core_loc_conf_t *clcf;
clcf = ngx_http_get_module_loc_conf( r, ngx_http_core_module );
ngx_http_auth_radius_ctx_t* ctx = ngx_http_get_module_ctx( r, ngx_http_auth_radius_module );
if ( ctx == NULL )
abort(); // TODO
radius_str_t user = { RADIUS_STR_FROM_NGX_STR_INITIALIZER( r->headers_in.user ) };
radius_str_t passwd = { RADIUS_STR_FROM_NGX_STR_INITIALIZER( r->headers_in.passwd ) };
radius_req_queue_node_t* n;
n = radius_send_request( prev_req, &user, &passwd, clcf->error_log );
if ( n == NULL ) {
abort(); // TODO
}
ngx_http_auth_radius_main_conf_t* lconf = ngx_http_get_module_loc_conf( r, ngx_http_auth_radius_module );
ngx_add_timer( r->connection->read, lconf->radius_timeout );
radius_server_t* rs;
rs = get_server_by_req( n );
ngx_log_error( NGX_LOG_ERR, r->connection->log, 0, "ngx_send_radius_request rs: %d, assign 0x%xl to 0x%xl, id: %d", rs->id, r, n, n->ident );
n->data = r;
ctx->n = n;
ngx_connection_t* c = rs->data;
ngx_event_t* rev;
if ( c == NULL ) {
c = ngx_get_connection( rs->s, conf->log );
if ( c == NULL ) {
ngx_log_error( NGX_LOG_ERR, r->connection->log, 0, "ngx_send_radius_request: ngx_get_connection" );
if (ngx_close_socket( rs->s ) == -1)
ngx_log_error( NGX_LOG_ERR, r->connection->log, 0, "ngx_send_radius_request: ngx_close_socket" );
return NGX_ERROR;
}
if ( ngx_nonblocking( rs->s ) == -1 ) {
ngx_log_error( NGX_LOG_ERR, r->connection->log, 0, "ngx_send_radius_request: ngx_nonblocking" );
ngx_free_connection( c );
if (ngx_close_socket( rs->s ) == -1)
ngx_log_error( NGX_LOG_ERR, r->connection->log, 0, "ngx_send_radius_request: ngx_close_socket" );
return NGX_ERROR;
}
rs->data = c;
c->data = rs;
rev = c->read;
rev->handler = radius_read_handler;
rev->log = clcf->error_log;
rs->log = clcf->error_log;
if ( ngx_add_event( rev, NGX_READ_EVENT, NGX_LEVEL_EVENT ) != NGX_OK ) {
ngx_log_error( NGX_LOG_ERR, r->connection->log, 0, "ngx_send_radius_request: ngx_add_event" );
return NGX_ERROR;
}
c->number = ngx_atomic_fetch_add( ngx_connection_counter, 1 );
}
return NGX_OK;
}
//关闭cycle中listening动态数组已经打开的句柄
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_EPOLL_EVENT) {
/*
* it seems that Linux-2.6.x OpenVZ sends events
* for closed shared listening sockets unless
* the events was explicitly 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) == NGX_FILE_ERROR) {
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;
}
cycle->listening.nelts = 0;
}
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, 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 == (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;
}
void
ngx_master_process_cycle(ngx_cycle_t *cycle)
{
char *title;
u_char *p;
size_t size;
ngx_int_t i;
ngx_uint_t n, sigio;
sigset_t set;
struct itimerval itv;
ngx_uint_t live;
ngx_msec_t delay;
ngx_listening_t *ls;
ngx_core_conf_t *ccf;
sigemptyset(&set);
sigaddset(&set, SIGCHLD);
sigaddset(&set, SIGALRM);
sigaddset(&set, SIGIO);
sigaddset(&set, SIGINT);
sigaddset(&set, ngx_signal_value(NGX_RECONFIGURE_SIGNAL));
sigaddset(&set, ngx_signal_value(NGX_REOPEN_SIGNAL));
sigaddset(&set, ngx_signal_value(NGX_NOACCEPT_SIGNAL));
sigaddset(&set, ngx_signal_value(NGX_TERMINATE_SIGNAL));
sigaddset(&set, ngx_signal_value(NGX_SHUTDOWN_SIGNAL));
sigaddset(&set, ngx_signal_value(NGX_CHANGEBIN_SIGNAL));
if (sigprocmask(SIG_BLOCK, &set, NULL) == -1) {
ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
"sigprocmask() failed");
}
sigemptyset(&set);
size = sizeof(master_process);
for (i = 0; i < ngx_argc; i++) {
size += ngx_strlen(ngx_argv[i]) + 1;
}
title = ngx_pnalloc(cycle->pool, size);
p = ngx_cpymem(title, master_process, sizeof(master_process) - 1);
for (i = 0; i < ngx_argc; i++) {
*p++ = ' ';
p = ngx_cpystrn(p, (u_char *) ngx_argv[i], size);
}
ngx_setproctitle(title);
ccf = (ngx_core_conf_t *) ngx_get_conf(cycle->conf_ctx, ngx_core_module);
ngx_start_worker_processes(cycle, ccf->worker_processes,
NGX_PROCESS_RESPAWN);
ngx_start_cache_manager_processes(cycle, 0);
ngx_new_binary = 0;
delay = 0;
sigio = 0;
live = 1;
for ( ;; ) {
if (delay) {
if (ngx_sigalrm) {
sigio = 0;
delay *= 2;
ngx_sigalrm = 0;
}
ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
"termination cycle: %d", delay);
itv.it_interval.tv_sec = 0;
itv.it_interval.tv_usec = 0;
itv.it_value.tv_sec = delay / 1000;
itv.it_value.tv_usec = (delay % 1000 ) * 1000;
if (setitimer(ITIMER_REAL, &itv, NULL) == -1) {
ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
"setitimer() failed");
}
}
ngx_log_debug0(NGX_LOG_DEBUG_EVENT, cycle->log, 0, "sigsuspend");
sigsuspend(&set);
ngx_time_update();
ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
"wake up, sigio %i", sigio);
if (ngx_reap) {
ngx_reap = 0;
ngx_log_debug0(NGX_LOG_DEBUG_EVENT, cycle->log, 0, "reap children");
live = ngx_reap_children(cycle);
}
if (!live && (ngx_terminate || ngx_quit)) {
ngx_master_process_exit(cycle);
}
if (ngx_terminate) {
if (delay == 0) {
delay = 50;
}
if (sigio) {
sigio--;
continue;
}
sigio = ccf->worker_processes + 2 /* cache processes */;
if (delay > 1000) {
ngx_signal_worker_processes(cycle, SIGKILL);
} else {
ngx_signal_worker_processes(cycle,
ngx_signal_value(NGX_TERMINATE_SIGNAL));
}
continue;
}
if (ngx_quit) {
ngx_signal_worker_processes(cycle,
ngx_signal_value(NGX_SHUTDOWN_SIGNAL));
ls = cycle->listening.elts;
for (n = 0; n < cycle->listening.nelts; n++) {
if (ngx_close_socket(ls[n].fd) == -1) {
ngx_log_error(NGX_LOG_EMERG, cycle->log, ngx_socket_errno,
ngx_close_socket_n " %V failed",
&ls[n].addr_text);
}
}
cycle->listening.nelts = 0;
continue;
}
if (ngx_reconfigure) {
ngx_reconfigure = 0;
if (ngx_new_binary) {
ngx_start_worker_processes(cycle, ccf->worker_processes,
NGX_PROCESS_RESPAWN);
ngx_start_cache_manager_processes(cycle, 0);
ngx_noaccepting = 0;
continue;
}
ngx_log_error(NGX_LOG_NOTICE, cycle->log, 0, "reconfiguring");
cycle = ngx_init_cycle(cycle);
if (cycle == NULL) {
cycle = (ngx_cycle_t *) ngx_cycle;
continue;
}
ngx_cycle = cycle;
ccf = (ngx_core_conf_t *) ngx_get_conf(cycle->conf_ctx,
ngx_core_module);
ngx_start_worker_processes(cycle, ccf->worker_processes,
NGX_PROCESS_JUST_RESPAWN);
ngx_start_cache_manager_processes(cycle, 1);
/* allow new processes to start */
ngx_msleep(100);
live = 1;
ngx_signal_worker_processes(cycle,
ngx_signal_value(NGX_SHUTDOWN_SIGNAL));
}
if (ngx_restart) {
ngx_restart = 0;
ngx_start_worker_processes(cycle, ccf->worker_processes,
NGX_PROCESS_RESPAWN);
ngx_start_cache_manager_processes(cycle, 0);
live = 1;
}
if (ngx_reopen) {
ngx_reopen = 0;
ngx_log_error(NGX_LOG_NOTICE, cycle->log, 0, "reopening logs");
ngx_reopen_files(cycle, ccf->user);
ngx_signal_worker_processes(cycle,
ngx_signal_value(NGX_REOPEN_SIGNAL));
}
if (ngx_change_binary) {
ngx_change_binary = 0;
ngx_log_error(NGX_LOG_NOTICE, cycle->log, 0, "changing binary");
ngx_new_binary = ngx_exec_new_binary(cycle, ngx_argv);
}
if (ngx_noaccept) {
ngx_noaccept = 0;
ngx_noaccepting = 1;
ngx_signal_worker_processes(cycle,
ngx_signal_value(NGX_SHUTDOWN_SIGNAL));
}
}
}
/*启动nginx,主要有以下几步工作：
1.主进程设置信号阻塞
2.设置进程标题
3.启动worker进程
4.启动缓存索引重建进程和管理进程
5.主进程循环处理信号
*/
void
ngx_master_process_cycle(ngx_cycle_t *cycle)
{
char *title;
u_char *p;
size_t size;
ngx_int_t i;
ngx_uint_t n, sigio;
sigset_t set;
struct itimerval itv;
ngx_uint_t live;
ngx_msec_t delay;
ngx_listening_t *ls;
ngx_core_conf_t *ccf;
//设置信号阻塞，屏蔽一系列信号，防止被打扰，具体见《apue》
sigemptyset(&set);
sigaddset(&set, SIGCHLD);
sigaddset(&set, SIGALRM);
sigaddset(&set, SIGIO);
sigaddset(&set, SIGINT);
sigaddset(&set, ngx_signal_value(NGX_RECONFIGURE_SIGNAL));
sigaddset(&set, ngx_signal_value(NGX_REOPEN_SIGNAL));
sigaddset(&set, ngx_signal_value(NGX_NOACCEPT_SIGNAL));
sigaddset(&set, ngx_signal_value(NGX_TERMINATE_SIGNAL));
sigaddset(&set, ngx_signal_value(NGX_SHUTDOWN_SIGNAL));
sigaddset(&set, ngx_signal_value(NGX_CHANGEBIN_SIGNAL));
if (sigprocmask(SIG_BLOCK, &set, NULL) == -1) {
ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
"sigprocmask() failed");
}
sigemptyset(&set);
size = sizeof(master_process);
for (i = 0; i < ngx_argc; i++) {
size += ngx_strlen(ngx_argv[i]) + 1;
}
title = ngx_pnalloc(cycle->pool, size);
p = ngx_cpymem(title, master_process, sizeof(master_process) - 1);
for (i = 0; i < ngx_argc; i++) {
*p++ = ' ';
p = ngx_cpystrn(p, (u_char *) ngx_argv[i], size);
}
//设置进程标题
ngx_setproctitle(title);
//master进程获取core模块配置，ccf中有要创建多少个worker的设定
ccf = (ngx_core_conf_t *) ngx_get_conf(cycle->conf_ctx, ngx_core_module);
//启动worker,这时已经有了worker进程
ngx_start_worker_processes(cycle, ccf->worker_processes,
NGX_PROCESS_RESPAWN);
ngx_start_cache_manager_processes(cycle, 0); //创建有关cache的子进程
//信号处理是nginx服务器主进程在服务器运行期间的主要工作，通过一个for循环来实现对信号的循环处理。
ngx_new_binary = 0;
delay = 0;
sigio = 0;
live = 1;
for ( ;; ) {
//delay用来等待子进程退出的时间，由于我们接受到SIGINT信号后，我们需要先发送信号给子进程，
//而子进程的退出需要一定的时间，超时时如果子进程已退出，我们父进程就直接退出，
//否则发送sigkill信号给子进程(强制退出),然后再退出。
if (delay) {
if (ngx_sigalrm) {
sigio = 0;
delay *= 2;
ngx_sigalrm = 0;
}
ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
"termination cycle: %d", delay);
//初始化一个定时器
itv.it_interval.tv_sec = 0;
itv.it_interval.tv_usec = 0;
itv.it_value.tv_sec = delay / 1000;
itv.it_value.tv_usec = (delay % 1000 ) * 1000;
//设置定时器
if (setitimer(ITIMER_REAL, &itv, NULL) == -1) {
ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
"setitimer() failed");
}
}
ngx_log_debug0(NGX_LOG_DEBUG_EVENT, cycle->log, 0, "sigsuspend");
//延时，等待信号
sigsuspend(&set); //调用这个将master进程挂起来
ngx_time_update(); //更新缓冲时间
ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
"wake up, sigio %i", sigio);
//ngx_reap为1，说明有子进程已经退出
if (ngx_reap) {
ngx_reap = 0;
ngx_log_debug0(NGX_LOG_DEBUG_EVENT, cycle->log, 0, "reap children");
//这个里面处理退出的子进程(有的worker异常退出，这时我们就需要重启这个worker )，如果所有子进程都退出则会返回0.
live = ngx_reap_children(cycle);
}
//如果没有存活的子进程，并且收到了ngx_terminate或者ngx_quit信号，则master退出。
if (!live && (ngx_terminate || ngx_quit)) {
ngx_master_process_exit(cycle); //master退出
}
//收到了sigint信号
if (ngx_terminate) {
//设置延时
if (delay == 0) {
delay = 50;
}
if (sigio) {
sigio--;
continue;
}
sigio = ccf->worker_processes + 2 /* cache processes */;
if (delay > 1000) {
//如果超时，则强制杀死worker
ngx_signal_worker_processes(cycle, SIGKILL);
} else {
//负责发送sigint给worker，让它退出
ngx_signal_worker_processes(cycle,
ngx_signal_value(NGX_TERMINATE_SIGNAL));
}
continue;
}
//收到quit信号
if (ngx_quit) {
//发送给worker quit信号
ngx_signal_worker_processes(cycle,
ngx_signal_value(NGX_SHUTDOWN_SIGNAL));
ls = cycle->listening.elts;
for (n = 0; n < cycle->listening.nelts; n++) {
if (ngx_close_socket(ls[n].fd) == -1) { //关闭所有socket
ngx_log_error(NGX_LOG_EMERG, cycle->log, ngx_socket_errno,
ngx_close_socket_n " %V failed",
&ls[n].addr_text);
}
}
cycle->listening.nelts = 0;
continue;
}
//收到需要reconfig的信号
if (ngx_reconfigure) {
ngx_reconfigure = 0;
//判断是否热代码替换后的新的代码还在运行中(也就是还没退出当前的master)。如果还在运行中，则不需要重新初始化config
//ngx_new_binary表示程序本身需要升级，但不需要重新初始化nginx配置，直接调用ngx_start_wroker_process
if (ngx_new_binary) {
ngx_start_worker_processes(cycle, ccf->worker_processes,
NGX_PROCESS_RESPAWN);
ngx_start_cache_manager_processes(cycle, 0);
ngx_noaccepting = 0;
continue;
}
ngx_log_error(NGX_LOG_NOTICE, cycle->log, 0, "reconfiguring");
//重新初始化config，并重新启动新的worker
cycle = ngx_init_cycle(cycle);
if (cycle == NULL) {
cycle = (ngx_cycle_t *) ngx_cycle;
continue;
}
ngx_cycle = cycle;
ccf = (ngx_core_conf_t *) ngx_get_conf(cycle->conf_ctx,
ngx_core_module);
ngx_start_worker_processes(cycle, ccf->worker_processes,
NGX_PROCESS_JUST_RESPAWN);
ngx_start_cache_manager_processes(cycle, 1);
live = 1;
ngx_signal_worker_processes(cycle,
ngx_signal_value(NGX_SHUTDOWN_SIGNAL));
}
if (ngx_restart) {
ngx_restart = 0;
ngx_start_worker_processes(cycle, ccf->worker_processes,
NGX_PROCESS_RESPAWN);
ngx_start_cache_manager_processes(cycle, 0);
live = 1;
}
//重新打开
if (ngx_reopen) {
ngx_reopen = 0;
ngx_log_error(NGX_LOG_NOTICE, cycle->log, 0, "reopening logs");
ngx_reopen_files(cycle, ccf->user);
ngx_signal_worker_processes(cycle,
ngx_signal_value(NGX_REOPEN_SIGNAL));
}
//热代码替换
if (ngx_change_binary) {
ngx_change_binary = 0;
ngx_log_error(NGX_LOG_NOTICE, cycle->log, 0, "changing binary");
//进行热代码替换，这里是调用execve来执行新的代码
ngx_new_binary = ngx_exec_new_binary(cycle, ngx_argv);
}
//接受到停止accept连接，其实也就是worker退出(有区别的是，这里master不需要退出)
if (ngx_noaccept) {
ngx_noaccept = 0;
ngx_noaccepting = 1;
//给worker发送信号
ngx_signal_worker_processes(cycle,
ngx_signal_value(NGX_SHUTDOWN_SIGNAL));
}
} //end of for 信号处理结束
}
/*
ngx_http_close_request方法是更高层的用于关闭请求的方法，当然，HTTP模块一般也不会直接调用它的。在上面几节中反复提到的引用计数，
就是由ngx_http_close_request方法负责检测的，同时它会在引用计数清零时正式调用ngx_http_free_request方法和ngx_http_close_connection(ngx_close_connection)
方法来释放请求、关闭连接,见ngx_http_close_request
*/
void
ngx_close_connection(ngx_connection_t *c)
{
ngx_err_t err;
ngx_uint_t log_error, level;
ngx_socket_t fd;
if (c->fd == (ngx_socket_t) -1) {
ngx_log_error(NGX_LOG_ALERT, c->log, 0, "connection already closed");
return;
}
/*
首先将连接的读/写事件从定时器中取出。实际上就是检查读/写事件的time_set标志位，如果为1，则证明事件在定时器中，那么需要调
用ngx_del_timer方法把事件从定时器中移除。
*/
if (c->read->timer_set) {
ngx_del_timer(c->read, NGX_FUNC_LINE);
}
if (c->write->timer_set) {
ngx_del_timer(c->write, NGX_FUNC_LINE);
}
/*
调用ngx_del_conn宏（或者ngx_del_event宏）将读/写事件从epoll中移除。实际上就是调用ngx_event_actions_t接口
中的del_conn方法，当事件模块是epoll模块时，就是从epoll中移除这个连接的读/写事件。同时，如果这个事件在ngx_posted_accept_events或
者ngx_posted_events队列中，还需要调用ngx_delete_posted_event宏把事件从post事件队列中移除。
*/
if (ngx_del_conn) { //ngx_epoll_del_connection
ngx_del_conn(c, NGX_CLOSE_EVENT);
} else {
if (c->read->active || c->read->disabled) {
ngx_del_event(c->read, NGX_READ_EVENT, NGX_CLOSE_EVENT); //ngx_epoll_del_event
}
if (c->write->active || c->write->disabled) {
ngx_del_event(c->write, NGX_WRITE_EVENT, NGX_CLOSE_EVENT);
}
}
if (c->read->posted) {
ngx_delete_posted_event(c->read);
}
if (c->write->posted) {
ngx_delete_posted_event(c->write);
}
c->read->closed = 1;
c->write->closed = 1;
ngx_reusable_connection(c, 0);
log_error = c->log_error;
/*
调用ngx_free_connection方法把表示连接的ngx_connection-t结构体归还给ngx_
cycle_t核心结构体的空闲连接池free connections。
*/
ngx_free_connection(c);
fd = c->fd;
c->fd = (ngx_socket_t) -1;
ngx_log_debugall(ngx_cycle->log, 0, "close socket:%d", fd);
//调用系统提供的close方法关闭这个TCP连接套接字。
if (ngx_close_socket(fd) == -1) {
err = ngx_socket_errno;
if (err == NGX_ECONNRESET || err == NGX_ENOTCONN) {
switch (log_error) {
case NGX_ERROR_INFO:
level = NGX_LOG_INFO;
break;
case NGX_ERROR_ERR:
level = NGX_LOG_ERR;
break;
default:
level = NGX_LOG_CRIT;
}
} else {
level = NGX_LOG_CRIT;
}
/* we use ngx_cycle->log because c->log was in c->pool */
//由于c已经在前面释放了，因此不能再用C->log了
ngx_log_error(level, ngx_cycle->log, err,
ngx_close_socket_n " %d failed", fd);
}
}
ngx_int_t
ngx_event_connect_peer(ngx_peer_connection_t *pc)
{
int rc, type;
#if (NGX_HAVE_IP_BIND_ADDRESS_NO_PORT || NGX_LINUX)
in_port_t port;
#endif
ngx_int_t event;
ngx_err_t err;
ngx_uint_t level;
ngx_socket_t s;
ngx_event_t *rev, *wev;
ngx_connection_t *c;
rc = pc->get(pc, pc->data);
if (rc != NGX_OK) {
return rc;
}
type = (pc->type ? pc->type : SOCK_STREAM);
s = ngx_socket(pc->sockaddr->sa_family, type, 0);
ngx_log_debug2(NGX_LOG_DEBUG_EVENT, pc->log, 0, "%s socket %d",
(type == SOCK_STREAM) ? "stream" : "dgram", s);
if (s == (ngx_socket_t) -1) {
ngx_log_error(NGX_LOG_ALERT, pc->log, ngx_socket_errno,
ngx_socket_n " failed");
return NGX_ERROR;
}
c = ngx_get_connection(s, pc->log);
if (c == NULL) {
if (ngx_close_socket(s) == -1) {
ngx_log_error(NGX_LOG_ALERT, pc->log, ngx_socket_errno,
ngx_close_socket_n "failed");
}
return NGX_ERROR;
}
c->type = type;
if (pc->rcvbuf) {
if (setsockopt(s, SOL_SOCKET, SO_RCVBUF,
(const void *) &pc->rcvbuf, sizeof(int)) == -1)
{
ngx_log_error(NGX_LOG_ALERT, pc->log, ngx_socket_errno,
"setsockopt(SO_RCVBUF) failed");
goto failed;
}
}
if (ngx_nonblocking(s) == -1) {
ngx_log_error(NGX_LOG_ALERT, pc->log, ngx_socket_errno,
ngx_nonblocking_n " failed");
goto failed;
}
if (pc->local) {
#if (NGX_HAVE_TRANSPARENT_PROXY)
if (pc->transparent) {
if (ngx_event_connect_set_transparent(pc, s) != NGX_OK) {
goto failed;
}
}
#endif
#if (NGX_HAVE_IP_BIND_ADDRESS_NO_PORT || NGX_LINUX)
port = ngx_inet_get_port(pc->local->sockaddr);
#endif
#if (NGX_HAVE_IP_BIND_ADDRESS_NO_PORT)
if (pc->sockaddr->sa_family != AF_UNIX && port == 0) {
static int bind_address_no_port = 1;
if (bind_address_no_port) {
if (setsockopt(s, IPPROTO_IP, IP_BIND_ADDRESS_NO_PORT,
(const void *) &bind_address_no_port,
sizeof(int)) == -1)
{
err = ngx_socket_errno;
if (err != NGX_EOPNOTSUPP && err != NGX_ENOPROTOOPT) {
ngx_log_error(NGX_LOG_ALERT, pc->log, err,
"setsockopt(IP_BIND_ADDRESS_NO_PORT) "
"failed, ignored");
} else {
bind_address_no_port = 0;
}
}
}
}
#endif
#if (NGX_LINUX)
if (pc->type == SOCK_DGRAM && port != 0) {
int reuse_addr = 1;
if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR,
(const void *) &reuse_addr, sizeof(int))
== -1)
{
ngx_log_error(NGX_LOG_ALERT, pc->log, ngx_socket_errno,
"setsockopt(SO_REUSEADDR) failed");
goto failed;
}
}
#endif
if (bind(s, pc->local->sockaddr, pc->local->socklen) == -1) {
ngx_log_error(NGX_LOG_CRIT, pc->log, ngx_socket_errno,
"bind(%V) failed", &pc->local->name);
goto failed;
}
}
if (type == SOCK_STREAM) {
c->recv = ngx_recv;
c->send = ngx_send;
c->recv_chain = ngx_recv_chain;
c->send_chain = ngx_send_chain;
c->sendfile = 1;
if (pc->sockaddr->sa_family == AF_UNIX) {
c->tcp_nopush = NGX_TCP_NOPUSH_DISABLED;
c->tcp_nodelay = NGX_TCP_NODELAY_DISABLED;
#if (NGX_SOLARIS)
/* Solaris's sendfilev() supports AF_NCA, AF_INET, and AF_INET6 */
c->sendfile = 0;
#endif
}
} else { /* type == SOCK_DGRAM */
c->recv = ngx_udp_recv;
c->send = ngx_send;
c->send_chain = ngx_udp_send_chain;
}
c->log_error = pc->log_error;
rev = c->read;
wev = c->write;
rev->log = pc->log;
wev->log = pc->log;
pc->connection = c;
c->number = ngx_atomic_fetch_add(ngx_connection_counter, 1);
if (ngx_add_conn) {
if (ngx_add_conn(c) == NGX_ERROR) {
goto failed;
}
}
ngx_log_debug3(NGX_LOG_DEBUG_EVENT, pc->log, 0,
"connect to %V, fd:%d #%uA", pc->name, s, c->number);
rc = connect(s, pc->sockaddr, pc->socklen);
if (rc == -1) {
err = ngx_socket_errno;
if (err != NGX_EINPROGRESS
#if (NGX_WIN32)
/* Winsock returns WSAEWOULDBLOCK (NGX_EAGAIN) */
&& err != NGX_EAGAIN
#endif
)
{
if (err == NGX_ECONNREFUSED
#if (NGX_LINUX)
/*
* Linux returns EAGAIN instead of ECONNREFUSED
* for unix sockets if listen queue is full
*/
|| err == NGX_EAGAIN
#endif
|| err == NGX_ECONNRESET
|| err == NGX_ENETDOWN
|| err == NGX_ENETUNREACH
|| err == NGX_EHOSTDOWN
|| err == NGX_EHOSTUNREACH)
{
level = NGX_LOG_ERR;
} else {
level = NGX_LOG_CRIT;
}
ngx_log_error(level, c->log, err, "connect() to %V failed",
pc->name);
ngx_close_connection(c);
pc->connection = NULL;
return NGX_DECLINED;
}
}
if (ngx_add_conn) {
if (rc == -1) {
/* NGX_EINPROGRESS */
return NGX_AGAIN;
}
ngx_log_debug0(NGX_LOG_DEBUG_EVENT, pc->log, 0, "connected");
wev->ready = 1;
return NGX_OK;
}
if (ngx_event_flags & NGX_USE_IOCP_EVENT) {
ngx_log_debug1(NGX_LOG_DEBUG_EVENT, pc->log, ngx_socket_errno,
"connect(): %d", rc);
if (ngx_blocking(s) == -1) {
ngx_log_error(NGX_LOG_ALERT, pc->log, ngx_socket_errno,
ngx_blocking_n " failed");
goto failed;
}
/*
* FreeBSD's aio allows to post an operation on non-connected socket.
* NT does not support it.
*
* TODO: check in Win32, etc. As workaround we can use NGX_ONESHOT_EVENT
*/
rev->ready = 1;
wev->ready = 1;
return NGX_OK;
}
if (ngx_event_flags & NGX_USE_CLEAR_EVENT) {
/* kqueue */
event = NGX_CLEAR_EVENT;
} else {
/* select, poll, /dev/poll */
event = NGX_LEVEL_EVENT;
}
if (ngx_add_event(rev, NGX_READ_EVENT, event) != NGX_OK) {
goto failed;
}
if (rc == -1) {
/* NGX_EINPROGRESS */
if (ngx_add_event(wev, NGX_WRITE_EVENT, event) != NGX_OK) {
goto failed;
}
return NGX_AGAIN;
}
ngx_log_debug0(NGX_LOG_DEBUG_EVENT, pc->log, 0, "connected");
wev->ready = 1;
return NGX_OK;
failed:
ngx_close_connection(c);
pc->connection = NULL;
return NGX_ERROR;
}
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--) { //bind和listen最多从实5次
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)) //端口复用需要内核支持
== -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;
}
/*
默认情况下,server重启,调用socket,bind,然后listen,会失败.因为该端口正在被使用.如果设定SO_REUSEADDR,那么server重启才会成功.因此,
所有的TCP server都必须设定此选项,用以应对server重启的现象.
*/
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, close sock:%d",
&ls[i].addr_text, s);
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)) //端口复用需要内核支持
== -1)
{
ngx_log_error(NGX_LOG_EMERG, log, ngx_socket_errno,
"setsockopt(SO_REUSEPORT) %V failed, ignored, close sock:%d",
&ls[i].addr_text, s);
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, close sock:%d",
&ls[i].addr_text,s);
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);
}
ngx_log_error(NGX_LOG_EMERG, log, err,
"close socket:%d", s);
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 (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);
ngx_log_error(NGX_LOG_EMERG, log, err, "close socket:%d", s);
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;
}
//监听，绑定cycle中listening动态数组指定的相应端口
//cycle是当前进程的ngx_cycle_t结构体指针
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 != (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_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 (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;
}
void
ngx_close_connection(ngx_connection_t *c)
{
ngx_err_t err;
ngx_uint_t log_error, level;
ngx_socket_t fd;
if (c->fd == -1) {
ngx_log_error(NGX_LOG_ALERT, c->log, 0, "connection already closed");
return;
}
if (c->read->timer_set) {
ngx_del_timer(c->read);
}
if (c->write->timer_set) {
ngx_del_timer(c->write);
}
if (ngx_del_conn) {
ngx_del_conn(c, NGX_CLOSE_EVENT);
} else {
if (c->read->active || c->read->disabled) {
ngx_del_event(c->read, NGX_READ_EVENT, NGX_CLOSE_EVENT);
}
if (c->write->active || c->write->disabled) {
ngx_del_event(c->write, NGX_WRITE_EVENT, NGX_CLOSE_EVENT);
}
}
#if (NGX_THREADS)
/*
* we have to clean the connection information before the closing
* because another thread may reopen the same file descriptor
* before we clean the connection
*/
ngx_mutex_lock(ngx_posted_events_mutex);
if (c->read->prev) {
ngx_delete_posted_event(c->read);
}
if (c->write->prev) {
ngx_delete_posted_event(c->write);
}
c->read->closed = 1;
c->write->closed = 1;
if (c->single_connection) {
ngx_unlock(&c->lock);
c->read->locked = 0;
c->write->locked = 0;
}
ngx_mutex_unlock(ngx_posted_events_mutex);
#else
if (c->read->prev) {
ngx_delete_posted_event(c->read);
}
if (c->write->prev) {
ngx_delete_posted_event(c->write);
}
c->read->closed = 1;
c->write->closed = 1;
#endif
ngx_reusable_connection(c, 0);
log_error = c->log_error;
ngx_free_connection(c);
fd = c->fd;
c->fd = (ngx_socket_t) -1;
if (ngx_close_socket(fd) == -1) {
err = ngx_socket_errno;
if (err == NGX_ECONNRESET || err == NGX_ENOTCONN) {
switch (log_error) {
case NGX_ERROR_INFO:
level = NGX_LOG_INFO;
break;
case NGX_ERROR_ERR:
level = NGX_LOG_ERR;
break;
default:
level = NGX_LOG_CRIT;
}
} else {
level = NGX_LOG_CRIT;
}
/* we use ngx_cycle->log because c->log was in c->pool */
ngx_log_error(level, ngx_cycle->log, err,
ngx_close_socket_n " %d failed", fd);
}
}
void
ngx_close_connection(ngx_connection_t *c)
{
ngx_err_t err;
ngx_uint_t log_error, level;
ngx_socket_t fd;
if (c->fd == (ngx_socket_t) -1) {
ngx_log_error(NGX_LOG_ALERT, c->log, 0, "connection already closed");
return;
}
//首先将连接的读写事件从定时器中取出
if (c->read->timer_set) {
ngx_del_timer(c->read);
}
if (c->write->timer_set) {
ngx_del_timer(c->write);
}
if (ngx_del_conn) { //将读写事件从epoll中移除
ngx_del_conn(c, NGX_CLOSE_EVENT);
} else {
if (c->read->active || c->read->disabled) {
ngx_del_event(c->read, NGX_READ_EVENT, NGX_CLOSE_EVENT);
}
if (c->write->active || c->write->disabled) {
ngx_del_event(c->write, NGX_WRITE_EVENT, NGX_CLOSE_EVENT);
}
}
if (c->read->posted) {
ngx_delete_posted_event(c->read);
}
if (c->write->posted) {
ngx_delete_posted_event(c->write);
}
c->read->closed = 1;
c->write->closed = 1;
ngx_reusable_connection(c, 0);
log_error = c->log_error;
//调用ngx_free_connection方法把表示连接的ngx_connection_t结构体归还给ngx_cycle_t核心结构体的空闲连接池
ngx_free_connection(c);
fd = c->fd;
c->fd = (ngx_socket_t) -1;
if (ngx_close_socket(fd) == -1) { //系统调用close
err = ngx_socket_errno;
if (err == NGX_ECONNRESET || err == NGX_ENOTCONN) {
switch (log_error) {
case NGX_ERROR_INFO:
level = NGX_LOG_INFO;
break;
case NGX_ERROR_ERR:
level = NGX_LOG_ERR;
break;
default:
level = NGX_LOG_CRIT;
}
} else {
level = NGX_LOG_CRIT;
}
/* we use ngx_cycle->log because c->log was in c->pool */
ngx_log_error(level, ngx_cycle->log, err,
ngx_close_socket_n " %d failed", fd);
}
}
ngx_int_t
ngx_tcp_open_listening_socket(ngx_listening_t *ls)
{
int reuseaddr;
ngx_uint_t tries, failed;
ngx_err_t err;
ngx_log_t *log;
ngx_socket_t s;
reuseaddr = 1;
log = ls->logp;
for (tries = 5; tries; tries--) {
failed = 0;
if (ls->ignore) {
continue;
}
if (ls->fd != -1) {
break;
}
s = ngx_socket(ls->sockaddr->sa_family, ls->type, 0);
if (s == -1) {
ngx_log_error(NGX_LOG_EMERG, log, ngx_socket_errno,
ngx_socket_n " %V failed", &ls->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->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->addr_text);
}
return NGX_ERROR;
}
#if (NGX_HAVE_INET6 && defined IPV6_V6ONLY)
if (ls->sockaddr->sa_family == AF_INET6) {
int ipv6only;
ipv6only = ls->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->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->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->addr_text);
}
return NGX_ERROR;
}
}
ngx_log_debug2(NGX_LOG_DEBUG_CORE, log, 0,
"bind() %V #%d ", &ls->addr_text, s);
#if (NGX_HAVE_UNIX_DOMAIN)
{
u_char *name;
name = ls->addr_text.data + sizeof("unix:") - 1;
unlink((const char *)name);
}
#endif
if (bind(s, ls->sockaddr, ls->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->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->addr_text);
}
if (err != NGX_EADDRINUSE) {
return NGX_ERROR;
}
failed = 1;
break;
}
#if (NGX_HAVE_UNIX_DOMAIN)
if (ls->sockaddr->sa_family == AF_UNIX) {
mode_t mode;
u_char *name;
name = ls->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, 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, log, ngx_errno,
ngx_delete_file_n " %s failed", name);
}
}
}
#endif
if (listen(s, ls->backlog) == -1) {
ngx_log_error(NGX_LOG_EMERG, log, ngx_socket_errno,
"listen() to %V, backlog %d failed",
&ls->addr_text, ls->backlog);
if (ngx_close_socket(s) == -1) {
ngx_log_error(NGX_LOG_EMERG, log, ngx_socket_errno,
ngx_close_socket_n " %V failed",
&ls->addr_text);
}
return NGX_ERROR;
}
ls->listen = 1;
ls->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;
}
