Mirror of the official OpenWrt libubox repository https://git.openwrt.org/project/libubox
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/*
* ulog - simple logging functions
*
* Copyright (C) 2015 Jo-Philipp Wich <jow@openwrt.org>
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include "ulog.h"
#include <stdio.h>
#include <stdarg.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
static int _ulog_channels = -1;
static int _ulog_facility = -1;
static int _ulog_threshold = LOG_DEBUG;
static int _ulog_initialized = 0;
static const char *_ulog_ident = NULL;
static const char *ulog_default_ident(void)
{
FILE *self;
static char line[64];
char *p = NULL;
char *sbuf;
if ((self = fopen("/proc/self/status", "r")) != NULL) {
while (fgets(line, sizeof(line), self)) {
if (!strncmp(line, "Name:", 5)) {
strtok_r(line, "\t\n", &sbuf);
p = strtok_r(NULL, "\t\n", &sbuf);
break;
}
}
fclose(self);
}
return p;
}
static void ulog_defaults(void)
{
char *env;
if (_ulog_initialized)
return;
env = getenv("PREINIT");
if (_ulog_channels < 0) {
if (env && !strcmp(env, "1"))
_ulog_channels = ULOG_KMSG;
else if (isatty(1))
_ulog_channels = ULOG_STDIO;
else
_ulog_channels = ULOG_SYSLOG;
}
if (_ulog_facility < 0) {
if (env && !strcmp(env, "1"))
_ulog_facility = LOG_DAEMON;
else if (isatty(1))
_ulog_facility = LOG_USER;
else
_ulog_facility = LOG_DAEMON;
}
if (_ulog_ident == NULL && _ulog_channels != ULOG_STDIO)
_ulog_ident = ulog_default_ident();
if (_ulog_channels & ULOG_SYSLOG)
openlog(_ulog_ident, 0, _ulog_facility);
_ulog_initialized = 1;
}
__attribute__((format(printf, 2, 0)))
static void ulog_kmsg(int priority, const char *fmt, va_list ap)
{
FILE *kmsg;
if ((kmsg = fopen("/dev/kmsg", "r+")) != NULL) {
fprintf(kmsg, "<%u>", priority);
if (_ulog_ident)
fprintf(kmsg, "%s: ", _ulog_ident);
vfprintf(kmsg, fmt, ap);
fclose(kmsg);
}
}
__attribute__((format(printf, 2, 0)))
static void ulog_stdio(int priority, const char *fmt, va_list ap)
{
FILE *out = stderr;
if (_ulog_ident)
fprintf(out, "%s: ", _ulog_ident);
vfprintf(out, fmt, ap);
}
__attribute__((format(printf, 2, 0)))
static void ulog_syslog(int priority, const char *fmt, va_list ap)
{
vsyslog(priority, fmt, ap);
}
void ulog_open(int channels, int facility, const char *ident)
{
ulog_close();
_ulog_channels = channels;
_ulog_facility = facility;
_ulog_ident = ident;
}
void ulog_close(void)
{
if (!_ulog_initialized)
return;
if (_ulog_channels & ULOG_SYSLOG)
closelog();
_ulog_initialized = 0;
}
void ulog_threshold(int threshold)
{
_ulog_threshold = threshold;
}
void ulog(int priority, const char *fmt, ...)
{
va_list ap;
if (priority > _ulog_threshold)
return;
ulog_defaults();
if (_ulog_channels & ULOG_KMSG)
{
va_start(ap, fmt);
ulog_kmsg(priority, fmt, ap);
va_end(ap);
}
if (_ulog_channels & ULOG_STDIO)
{
va_start(ap, fmt);
ulog_stdio(priority, fmt, ap);
va_end(ap);
}
if (_ulog_channels & ULOG_SYSLOG)
{
va_start(ap, fmt);
ulog_syslog(priority, fmt, ap);
va_end(ap);
}
}