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/* common.c
*
* Functions for debugging and logging as well as some other
* simple helper functions.
*
* Russ Dill <Russ.Dill@asu.edu> 2001-2003
* Rewritten by Vladimir Oleynik <dzo@simtreas.ru> (C) 2003
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <fcntl.h>
#include <unistd.h>
#include <errno.h>
#include <string.h>
#include <stdlib.h>
#include <signal.h>
#include <paths.h>
#include <sys/socket.h>
#include <stdarg.h>
#include "common.h"
#include "pidfile.h"
static int daemonized;
long uptime(void)
{
struct sysinfo info;
sysinfo(&info);
return info.uptime;
}
/*
* This function makes sure our first socket calls
* aren't going to fd 1 (printf badness...) and are
* not later closed by daemon()
*/
static inline void sanitize_fds(void)
{
int zero;
if ((zero = open(_PATH_DEVNULL, O_RDWR, 0)) < 0) return;
while (zero < 3) zero = dup(zero);
close(zero);
}
void background(const char *pidfile)
{
#ifdef __uClinux__
LOG(LOG_ERR, "Cannot background in uclinux (yet)");
#else /* __uClinux__ */
int pid_fd;
/* hold lock during fork. */
pid_fd = pidfile_acquire(pidfile);
if (daemon(0, 0) == -1) {
perror("fork");
exit(1);
}
daemonized++;
pidfile_write_release(pid_fd);
#endif /* __uClinux__ */
}
#ifdef UDHCP_SYSLOG
void udhcp_logging(int level, const char *fmt, ...)
{
va_list p;
va_list p2;
va_start(p, fmt);
__va_copy(p2, p);
if(!daemonized) {
vprintf(fmt, p);
putchar('\n');
}
vsyslog(level, fmt, p2);
va_end(p);
}
void start_log_and_pid(const char *client_server, const char *pidfile)
{
int pid_fd;
/* Make sure our syslog fd isn't overwritten */
sanitize_fds();
/* do some other misc startup stuff while we are here to save bytes */
pid_fd = pidfile_acquire(pidfile);
pidfile_write_release(pid_fd);
/* equivelent of doing a fflush after every \n */
setlinebuf(stdout);
openlog(client_server, LOG_PID | LOG_CONS, LOG_LOCAL0);
udhcp_logging(LOG_INFO, "%s (v%s) started", client_server, VERSION);
}
#else
static char *syslog_level_msg[] = {
[LOG_EMERG] = "EMERGENCY!",
[LOG_ALERT] = "ALERT!",
[LOG_CRIT] = "critical!",
[LOG_WARNING] = "warning",
[LOG_ERR] = "error",
[LOG_INFO] = "info",
[LOG_DEBUG] = "debug"
};
void udhcp_logging(int level, const char *fmt, ...)
{
va_list p;
va_start(p, fmt);
if(!daemonized) {
printf("%s, ", syslog_level_msg[level]);
vprintf(fmt, p);
putchar('\n');
}
va_end(p);
}
void start_log_and_pid(const char *client_server, const char *pidfile)
{
int pid_fd;
/* Make sure our syslog fd isn't overwritten */
sanitize_fds();
/* do some other misc startup stuff while we are here to save bytes */
pid_fd = pidfile_acquire(pidfile);
pidfile_write_release(pid_fd);
/* equivelent of doing a fflush after every \n */
setlinebuf(stdout);
udhcp_logging(LOG_INFO, "%s (v%s) started", client_server, VERSION);
}
#endif
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