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nginx/src/core/ngx_log.c

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/*
* Copyright (C) Igor Sysoev
*/
#include <ngx_config.h>
#include <ngx_core.h>
static void ngx_log_write(ngx_log_t *log, char *errstr, size_t len);
static char *ngx_set_error_log(ngx_conf_t *cf, ngx_command_t *cmd, void *conf);
static ngx_command_t ngx_errlog_commands[] = {
{ngx_string("error_log"),
NGX_MAIN_CONF|NGX_CONF_1MORE,
ngx_set_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,
&ngx_errlog_module_ctx, /* module context */
ngx_errlog_commands, /* module directives */
NGX_CORE_MODULE, /* module type */
NULL, /* init module */
NULL /* init child */
};
static ngx_log_t ngx_log;
static ngx_open_file_t ngx_stderr;
static const char *err_levels[] = {
"stderr", "emerg", "alert", "crit", "error",
"warn", "notice", "info", "debug"
};
static const char *debug_levels[] = {
"debug_core", "debug_alloc", "debug_mutex", "debug_event",
"debug_http", "debug_imap"
};
#if (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
{
char errstr[MAX_ERROR_STR];
size_t len, max;
#if (HAVE_VARIADIC_MACROS)
va_list args;
#endif
if (log->file->fd == NGX_INVALID_FILE) {
return;
}
ngx_memcpy(errstr, ngx_cached_err_log_time.data,
ngx_cached_err_log_time.len);
#if (WIN32)
max = MAX_ERROR_STR - 2;
#else
max = MAX_ERROR_STR - 1;
#endif
len = ngx_cached_err_log_time.len;
len += ngx_snprintf(errstr + len, max - len, " [%s] ", err_levels[level]);
/* pid#tid */
len += ngx_snprintf(errstr + len, max - len,
PID_T_FMT "#" TID_T_FMT ": ", ngx_log_pid, ngx_log_tid);
if (log->data && *(int *) log->data != -1) {
len += ngx_snprintf(errstr + len, max - len,
"*%u ", *(u_int *) log->data);
}
#if (HAVE_VARIADIC_MACROS)
va_start(args, fmt);
len += ngx_vsnprintf(errstr + len, max - len, fmt, args);
va_end(args);
#else
len += ngx_vsnprintf(errstr + len, max - len, fmt, args);
#endif
if (err) {
if (len > max - 50) {
/* leave a space for an error code */
len = max - 50;
errstr[len++] = '.';
errstr[len++] = '.';
errstr[len++] = '.';
}
#if (WIN32)
if ((unsigned) err >= 0x80000000) {
len += ngx_snprintf(errstr + len, max - len, " (%X: ", err);
} else {
len += ngx_snprintf(errstr + len, max - len, " (%d: ", err);
}
#else
len += ngx_snprintf(errstr + len, max - len, " (%d: ", err);
#endif
if (len >= max) {
ngx_log_write(log, errstr, max);
return;
}
len += ngx_strerror_r(err, errstr + len, max - len);
if (len >= max) {
ngx_log_write(log, errstr, max);
return;
}
errstr[len++] = ')';
if (len >= max) {
ngx_log_write(log, errstr, max);
return;
}
} else {
if (len >= max) {
ngx_log_write(log, errstr, max);
return;
}
}
if (level != NGX_LOG_DEBUG && log->handler) {
len += log->handler(log->data, errstr + len, max - len);
if (len >= max) {
len = max;
}
}
ngx_log_write(log, errstr, len);
}
static void ngx_log_write(ngx_log_t *log, char *errstr, size_t len)
{
#if (WIN32)
u_long written;
errstr[len++] = CR;
errstr[len++] = LF;
WriteFile(log->file->fd, errstr, len, &written, NULL);
#else
errstr[len++] = LF;
write(log->file->fd, errstr, len);
#endif
}
#if !(HAVE_VARIADIC_MACROS)
void 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_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);
}
void ngx_assert_core(ngx_log_t *log, const char *fmt, ...)
{
va_list args;
va_start(args, fmt);
ngx_log_error_core(NGX_LOG_ALERT, log, 0, fmt, args);
va_end(args);
}
#endif
ngx_log_t *ngx_log_init_errlog()
{
ngx_fd_t fd;
#if (WIN32)
ngx_stderr.fd = GetStdHandle(STD_ERROR_HANDLE);
if (ngx_stderr.fd == NGX_INVALID_FILE) {
/* TODO: where can we log error ? */
return NULL;
} else if (ngx_stderr.fd == NULL) {
/* there are no associated standard handles */
/* TODO: where can we can log possible errors ? */
ngx_stderr.fd = NGX_INVALID_FILE;
}
#else
ngx_stderr.fd = STDERR_FILENO;
#endif
ngx_log.file = &ngx_stderr;
ngx_log.log_level = NGX_LOG_ERR;
#ifdef NGX_ERROR_LOG_PATH
fd = ngx_open_file(NGX_ERROR_LOG_PATH, NGX_FILE_RDWR,
NGX_FILE_CREATE_OR_OPEN|NGX_FILE_APPEND);
if (fd == NGX_INVALID_FILE) {
ngx_log_error(NGX_LOG_EMERG, (&ngx_log), ngx_errno,
ngx_open_file_n " \"" NGX_ERROR_LOG_PATH "\" failed");
return NULL;
}
#if (WIN32)
if (ngx_file_append_mode(fd) == NGX_ERROR) {
ngx_log_error(NGX_LOG_EMERG, (&ngx_log), ngx_errno,
ngx_file_append_mode_n " \"" NGX_ERROR_LOG_PATH
"\" failed");
return NULL;
}
#else
if (dup2(fd, STDERR_FILENO) == NGX_ERROR) {
ngx_log_error(NGX_LOG_EMERG, (&ngx_log), ngx_errno,
"dup2(STDERR) failed");
return NULL;
}
#endif
#endif
return &ngx_log;
}
ngx_log_t *ngx_log_create_errlog(ngx_cycle_t *cycle, ngx_array_t *args)
{
ngx_log_t *log;
ngx_str_t *value, *name;
if (args) {
value = args->elts;
name = &value[1];
} else {
name = NULL;
}
if (!(log = ngx_pcalloc(cycle->pool, sizeof(ngx_log_t)))) {
return NULL;
}
if (!(log->file = ngx_conf_open_file(cycle, name))) {
return NULL;
}
return log;
}
char *ngx_set_error_log_levels(ngx_conf_t *cf, ngx_log_t *log)
{
ngx_uint_t i, n, d;
ngx_str_t *value;
value = cf->args->elts;
for (i = 2; i < cf->args->nelts; i++) {
for (n = 1; n <= NGX_LOG_DEBUG; n++) {
if (ngx_strcmp(value[i].data, err_levels[n]) == 0) {
if (log->log_level != 0) {
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"invalid log level \"%s\"",
value[i].data);
return NGX_CONF_ERROR;
}
log->log_level = n;
continue;
}
}
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 \"%s\"",
value[i].data);
return NGX_CONF_ERROR;
}
log->log_level |= d;
}
}
if (log->log_level == 0) {
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"invalid log level \"%s\"", value[i].data);
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_set_error_log(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
{
ngx_str_t *value;
value = cf->args->elts;
cf->cycle->new_log->file->name = value[1];
if (ngx_conf_full_name(cf->cycle, &cf->cycle->new_log->file->name)
== NGX_ERROR)
{
return NGX_CONF_ERROR;
}
return ngx_set_error_log_levels(cf, cf->cycle->new_log);
}
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