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