char *
ngx_log_set_log(ngx_conf_t *cf, ngx_log_t **head)
{
ngx_log_t *new_log;
ngx_str_t *value, name;
if (*head != NULL && (*head)->log_level == 0) {
new_log = *head;
} else {
new_log = ngx_pcalloc(cf->pool, sizeof(ngx_log_t));
if (new_log == NULL) {
return NGX_CONF_ERROR;
}
if (*head == NULL) {
*head = new_log;
}
}
value = cf->args->elts;
if (ngx_strcmp(value[1].data, "stderr") == 0) {
ngx_str_null(&name);
cf->cycle->log_use_stderr = 1;
} else {
name = value[1];
}
new_log->file = ngx_conf_open_file(cf->cycle, &name);
if (new_log->file == NULL) {
return NGX_CONF_ERROR;
}
if (ngx_log_set_levels(cf, new_log) != NGX_CONF_OK) {
return NGX_CONF_ERROR;
}
if (*head != new_log) {
ngx_log_insert(*head, new_log);
}
return NGX_CONF_OK;
}
char *
ngx_log_set_log(ngx_conf_t *cf, ngx_log_t **head)
{
ngx_log_t *new_log;
ngx_str_t *value, name;
ngx_syslog_peer_t *peer;
if (*head != NULL && (*head)->log_level == 0) {
new_log = *head;
} else {
new_log = ngx_pcalloc(cf->pool, sizeof(ngx_log_t));
if (new_log == NULL) {
return NGX_CONF_ERROR;
}
if (*head == NULL) {
*head = new_log;
}
}
value = cf->args->elts;
if (ngx_strcmp(value[1].data, "stderr") == 0) {
ngx_str_null(&name);
cf->cycle->log_use_stderr = 1;
new_log->file = ngx_conf_open_file(cf->cycle, &name);
if (new_log->file == NULL) {
return NGX_CONF_ERROR;
}
} else if (ngx_strncmp(value[1].data, "memory:", 7) == 0) {
#if (NGX_DEBUG)
size_t size, needed;
ngx_pool_cleanup_t *cln;
ngx_log_memory_buf_t *buf;
value[1].len -= 7;
value[1].data += 7;
needed = sizeof("MEMLOG :" NGX_LINEFEED)
+ cf->conf_file->file.name.len
+ NGX_SIZE_T_LEN
+ NGX_INT_T_LEN
+ NGX_MAX_ERROR_STR;
size = ngx_parse_size(&value[1]);
if (size == (size_t) NGX_ERROR || size < needed) {
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"invalid buffer size \"%V\"", &value[1]);
return NGX_CONF_ERROR;
}
buf = ngx_pcalloc(cf->pool, sizeof(ngx_log_memory_buf_t));
if (buf == NULL) {
return NGX_CONF_ERROR;
}
buf->start = ngx_pnalloc(cf->pool, size);
if (buf->start == NULL) {
return NGX_CONF_ERROR;
}
buf->end = buf->start + size;
buf->pos = ngx_slprintf(buf->start, buf->end, "MEMLOG %uz %V:%ui%N",
size, &cf->conf_file->file.name,
cf->conf_file->line);
ngx_memset(buf->pos, ' ', buf->end - buf->pos);
cln = ngx_pool_cleanup_add(cf->pool, 0);
if (cln == NULL) {
return NGX_CONF_ERROR;
}
cln->data = new_log;
cln->handler = ngx_log_memory_cleanup;
new_log->writer = ngx_log_memory_writer;
new_log->wdata = buf;
#else
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"nginx was built without debug support");
return NGX_CONF_ERROR;
#endif
} else if (ngx_strncmp(value[1].data, "syslog:", 7) == 0) {
peer = ngx_pcalloc(cf->pool, sizeof(ngx_syslog_peer_t));
if (peer == NULL) {
return NGX_CONF_ERROR;
}
if (ngx_syslog_process_conf(cf, peer) != NGX_CONF_OK) {
return NGX_CONF_ERROR;
}
new_log->writer = ngx_syslog_writer;
new_log->wdata = peer;
} else {
new_log->file = ngx_conf_open_file(cf->cycle, &value[1]);
if (new_log->file == NULL) {
return NGX_CONF_ERROR;
}
}
if (ngx_log_set_levels(cf, new_log) != NGX_CONF_OK) {
return NGX_CONF_ERROR;
}
if (*head != new_log) {
ngx_log_insert(*head, new_log);
}
return NGX_CONF_OK;
}
//打开NGX_ERROR_LOG_PATH文件
ngx_log_t *ngx_log_init(u_char *prefix)
{
u_char *p, *name;
size_t nlen, plen;
ngx_log.file = &ngx_log_file;
ngx_log.log_level = NGX_LOG_NOTICE;
name = (u_char *) NGX_ERROR_LOG_PATH;
/*
* we use ngx_strlen() here since BCC warns about
* condition is always false and unreachable code
*/
nlen = ngx_strlen(name);
if (nlen == 0) {
ngx_log_file.fd = ngx_stderr;
return &ngx_log;
}
p = NULL;
#if (NGX_WIN32)
if (name[1] != ':') {
#else
if (name[0] != '/') {
#endif
if (prefix) {
plen = ngx_strlen(prefix);
} else {
#ifdef NGX_PREFIX
prefix = (u_char *) NGX_PREFIX;
plen = ngx_strlen(prefix);
#else
plen = 0;
#endif
}
if (plen) {
name = malloc(plen + nlen + 2); //"NGX_PREFIX/NGX_ERROR_LOG_PATH"
if (name == NULL) {
return NULL;
}
p = ngx_cpymem(name, prefix, plen);
if (!ngx_path_separator(*(p - 1))) {
*p++ = '/';
}
ngx_cpystrn(p, (u_char *) NGX_ERROR_LOG_PATH, nlen + 1);
p = name;
}
}
ngx_log_file.fd = ngx_open_file(name, NGX_FILE_APPEND,
NGX_FILE_CREATE_OR_OPEN,
NGX_FILE_DEFAULT_ACCESS);//打开logs/error.log文件
if (ngx_log_file.fd == NGX_INVALID_FILE) {
ngx_log_stderr(ngx_errno,
"[alert] could not open error log file: "
ngx_open_file_n " \"%s\" failed", name);
#if (NGX_WIN32)
ngx_event_log(ngx_errno,
"could not open error log file: "
ngx_open_file_n " \"%s\" failed", name);
#endif
ngx_log_file.fd = ngx_stderr;
}
if (p) {
ngx_free(p);
}
return &ngx_log;
}
/*
如果配置文件中没有error_log配置项，在配置文件解析完后调用errlog模块的ngx_log_open_default函数将日志等级默认置为NGX_LOG_ERR，
日志文件设置为NGX_ERROR_LOG_PATH（该宏是在configure时指定的）。
*/
ngx_int_t
ngx_log_open_default(ngx_cycle_t *cycle)
{
ngx_log_t *log;
static ngx_str_t error_log = ngx_string(NGX_ERROR_LOG_PATH);
/* 配置文件中不存在生效的error_log配置项时new_log.file就为空 */
if (ngx_log_get_file_log(&cycle->new_log) != NULL) {
return NGX_OK;
}
if (cycle->new_log.log_level != 0) {
/* there are some error logs, but no files */
log = ngx_pcalloc(cycle->pool, sizeof(ngx_log_t));
if (log == NULL) {
return NGX_ERROR;
}
} else {
/* no error logs at all */
log = &cycle->new_log;
}
log->log_level = NGX_LOG_ERR;
log->file = ngx_conf_open_file(cycle, &error_log);
if (log->file == NULL) {
return NGX_ERROR;
}
if (log != &cycle->new_log) {
ngx_log_insert(&cycle->new_log, log);
}
return NGX_OK;
}