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nginx/src/core/ngx_log.c

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/*
* Copyright (C) Igor Sysoev
* Copyright (C) Nginx, Inc.
*/
#include <ngx_config.h>
#include <ngx_core.h>
static char *ngx_error_log(ngx_conf_t *cf, ngx_command_t *cmd, void *conf);
static char *ngx_log_set_levels(ngx_conf_t *cf, ngx_log_t *log);
static void ngx_log_insert(ngx_log_t *log, ngx_log_t *new_log);
#if (NGX_DEBUG)
static void ngx_log_memory_writer(ngx_log_t *log, ngx_uint_t level,
u_char *buf, size_t len);
static void ngx_log_memory_cleanup(void *data);
typedef struct {
u_char *start;
u_char *end;
u_char *pos;
ngx_atomic_t written;
} ngx_log_memory_buf_t;
#endif
static ngx_command_t ngx_errlog_commands[] = {
{ngx_string("error_log"),
NGX_MAIN_CONF|NGX_CONF_1MORE,
ngx_error_log,
0,
0,
NULL},
ngx_null_command
};
static ngx_core_module_t ngx_errlog_module_ctx = {
ngx_string("errlog"),
NULL,
NULL
};
ngx_module_t ngx_errlog_module = {
NGX_MODULE_V1,
&ngx_errlog_module_ctx, /* module context */
ngx_errlog_commands, /* module directives */
NGX_CORE_MODULE, /* module type */
NULL, /* init master */
NULL, /* init module */
NULL, /* init process */
NULL, /* init thread */
NULL, /* exit thread */
NULL, /* exit process */
NULL, /* exit master */
NGX_MODULE_V1_PADDING
};
static ngx_log_t ngx_log;
static ngx_open_file_t ngx_log_file;
ngx_uint_t ngx_use_stderr = 1;
static ngx_str_t err_levels[] = {
ngx_null_string,
ngx_string("emerg"),
ngx_string("alert"),
ngx_string("crit"),
ngx_string("error"),
ngx_string("warn"),
ngx_string("notice"),
ngx_string("info"),
ngx_string("debug")
};
static const char *debug_levels[] = {
"debug_core", "debug_alloc", "debug_mutex", "debug_event",
"debug_http", "debug_mail", "debug_mysql", "debug_stream"
};
#if (NGX_HAVE_VARIADIC_MACROS)
void
ngx_log_error_core(ngx_uint_t level, ngx_log_t *log, ngx_err_t err,
const char *fmt, ...)
#else
void
ngx_log_error_core(ngx_uint_t level, ngx_log_t *log, ngx_err_t err,
const char *fmt, va_list args)
#endif
{
#if (NGX_HAVE_VARIADIC_MACROS)
va_list args;
#endif
u_char *p, *last, *msg;
ssize_t n;
ngx_uint_t wrote_stderr, debug_connection;
u_char errstr[NGX_MAX_ERROR_STR];
last = errstr + NGX_MAX_ERROR_STR;
p = ngx_cpymem(errstr, ngx_cached_err_log_time.data,
ngx_cached_err_log_time.len);
p = ngx_slprintf(p, last, " [%V] ", &err_levels[level]);
/* pid#tid */
p = ngx_slprintf(p, last, "%P#" NGX_TID_T_FMT ": ",
ngx_log_pid, ngx_log_tid);
if (log->connection) {
p = ngx_slprintf(p, last, "*%uA ", log->connection);
}
msg = p;
#if (NGX_HAVE_VARIADIC_MACROS)
va_start(args, fmt);
p = ngx_vslprintf(p, last, fmt, args);
va_end(args);
#else
p = ngx_vslprintf(p, last, fmt, args);
#endif
if (err) {
p = ngx_log_errno(p, last, err);
}
if (level != NGX_LOG_DEBUG && log->handler) {
p = log->handler(log, p, last - p);
}
if (p > last - NGX_LINEFEED_SIZE) {
p = last - NGX_LINEFEED_SIZE;
}
ngx_linefeed(p);
wrote_stderr = 0;
debug_connection = (log->log_level & NGX_LOG_DEBUG_CONNECTION) != 0;
while (log) {
if (log->log_level < level && !debug_connection) {
break;
}
if (log->writer) {
log->writer(log, level, errstr, p - errstr);
goto next;
}
if (ngx_time() == log->disk_full_time) {
/*
* on FreeBSD writing to a full filesystem with enabled softupdates
* may block process for much longer time than writing to non-full
* filesystem, so we skip writing to a log for one second
*/
goto next;
}
n = ngx_write_fd(log->file->fd, errstr, p - errstr);
if (n == -1 && ngx_errno == NGX_ENOSPC) {
log->disk_full_time = ngx_time();
}
if (log->file->fd == ngx_stderr) {
wrote_stderr = 1;
}
next:
log = log->next;
}
if (!ngx_use_stderr
|| level > NGX_LOG_WARN
|| wrote_stderr)
{
return;
}
msg -= (7 + err_levels[level].len + 3);
(void) ngx_sprintf(msg, "nginx: [%V] ", &err_levels[level]);
(void) ngx_write_console(ngx_stderr, msg, p - msg);
}
#if !(NGX_HAVE_VARIADIC_MACROS)
void ngx_cdecl
ngx_log_error(ngx_uint_t level, ngx_log_t *log, ngx_err_t err,
const char *fmt, ...)
{
va_list args;
if (log->log_level >= level) {
va_start(args, fmt);
ngx_log_error_core(level, log, err, fmt, args);
va_end(args);
}
}
void ngx_cdecl
ngx_log_debug_core(ngx_log_t *log, ngx_err_t err, const char *fmt, ...)
{
va_list args;
va_start(args, fmt);
ngx_log_error_core(NGX_LOG_DEBUG, log, err, fmt, args);
va_end(args);
}
#endif
void ngx_cdecl
ngx_log_abort(ngx_err_t err, const char *fmt, ...)
{
u_char *p;
va_list args;
u_char errstr[NGX_MAX_CONF_ERRSTR];
va_start(args, fmt);
p = ngx_vsnprintf(errstr, sizeof(errstr) - 1, fmt, args);
va_end(args);
ngx_log_error(NGX_LOG_ALERT, ngx_cycle->log, err,
"%*s", p - errstr, errstr);
}
void ngx_cdecl
ngx_log_stderr(ngx_err_t err, const char *fmt, ...)
{
u_char *p, *last;
va_list args;
u_char errstr[NGX_MAX_ERROR_STR];
last = errstr + NGX_MAX_ERROR_STR;
p = ngx_cpymem(errstr, "nginx: ", 7);
va_start(args, fmt);
p = ngx_vslprintf(p, last, fmt, args);
va_end(args);
if (err) {
p = ngx_log_errno(p, last, err);
}
if (p > last - NGX_LINEFEED_SIZE) {
p = last - NGX_LINEFEED_SIZE;
}
ngx_linefeed(p);
(void) ngx_write_console(ngx_stderr, errstr, p - errstr);
}
u_char *
ngx_log_errno(u_char *buf, u_char *last, ngx_err_t err)
{
if (buf > last - 50) {
/* leave a space for an error code */
buf = last - 50;
*buf++ = '.';
*buf++ = '.';
*buf++ = '.';
}
#if (NGX_WIN32)
buf = ngx_slprintf(buf, last, ((unsigned) err < 0x80000000)
? " (%d: " : " (%Xd: ", err);
#else
buf = ngx_slprintf(buf, last, " (%d: ", err);
#endif
buf = ngx_strerror(err, buf, last - buf);
if (buf < last) {
*buf++ = ')';
}
return buf;
}
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);
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);
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;
}
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);
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;
}
ngx_int_t
ngx_log_redirect_stderr(ngx_cycle_t *cycle)
{
ngx_fd_t fd;
if (cycle->log_use_stderr) {
return NGX_OK;
}
/* file log always exists when we are called */
fd = ngx_log_get_file_log(cycle->log)->file->fd;
if (fd != ngx_stderr) {
if (ngx_set_stderr(fd) == NGX_FILE_ERROR) {
ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
ngx_set_stderr_n " failed");
return NGX_ERROR;
}
}
return NGX_OK;
}
ngx_log_t *
ngx_log_get_file_log(ngx_log_t *head)
{
ngx_log_t *log;
for (log = head; log; log = log->next) {
if (log->file != NULL) {
return log;
}
}
return NULL;
}
static char *
ngx_log_set_levels(ngx_conf_t *cf, ngx_log_t *log)
{
ngx_uint_t i, n, d, found;
ngx_str_t *value;
if (cf->args->nelts == 2) {
log->log_level = NGX_LOG_ERR;
return NGX_CONF_OK;
}
value = cf->args->elts;
for (i = 2; i < cf->args->nelts; i++) {
found = 0;
for (n = 1; n <= NGX_LOG_DEBUG; n++) {
if (ngx_strcmp(value[i].data, err_levels[n].data) == 0) {
if (log->log_level != 0) {
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"duplicate log level \"%V\"",
&value[i]);
return NGX_CONF_ERROR;
}
log->log_level = n;
found = 1;
break;
}
}
for (n = 0, d = NGX_LOG_DEBUG_FIRST; d <= NGX_LOG_DEBUG_LAST; d <<= 1) {
if (ngx_strcmp(value[i].data, debug_levels[n++]) == 0) {
if (log->log_level & ~NGX_LOG_DEBUG_ALL) {
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"invalid log level \"%V\"",
&value[i]);
return NGX_CONF_ERROR;
}
log->log_level |= d;
found = 1;
break;
}
}
if (!found) {
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"invalid log level \"%V\"", &value[i]);
return NGX_CONF_ERROR;
}
}
if (log->log_level == NGX_LOG_DEBUG) {
log->log_level = NGX_LOG_DEBUG_ALL;
}
return NGX_CONF_OK;
}
static char *
ngx_error_log(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
{
ngx_log_t *dummy;
dummy = &cf->cycle->new_log;
return ngx_log_set_log(cf, &dummy);
}
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;
}
static void
ngx_log_insert(ngx_log_t *log, ngx_log_t *new_log)
{
ngx_log_t tmp;
if (new_log->log_level > log->log_level) {
/*
* list head address is permanent, insert new log after
* head and swap its contents with head
*/
tmp = *log;
*log = *new_log;
*new_log = tmp;
log->next = new_log;
return;
}
while (log->next) {
if (new_log->log_level > log->next->log_level) {
new_log->next = log->next;
log->next = new_log;
return;
}
log = log->next;
}
log->next = new_log;
}
#if (NGX_DEBUG)
static void
ngx_log_memory_writer(ngx_log_t *log, ngx_uint_t level, u_char *buf,
size_t len)
{
u_char *p;
size_t avail, written;
ngx_log_memory_buf_t *mem;
mem = log->wdata;
if (mem == NULL) {
return;
}
written = ngx_atomic_fetch_add(&mem->written, len);
p = mem->pos + written % (mem->end - mem->pos);
avail = mem->end - p;
if (avail >= len) {
ngx_memcpy(p, buf, len);
} else {
ngx_memcpy(p, buf, avail);
ngx_memcpy(mem->pos, buf + avail, len - avail);
}
}
static void
ngx_log_memory_cleanup(void *data)
{
ngx_log_t *log = data;
ngx_log_debug0(NGX_LOG_DEBUG_CORE, log, 0, "destroy memory log buffer");
log->wdata = NULL;
}
#endif
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