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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);
- }
- }
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