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/* vi: set sw=4 ts=4: */
/* 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
*
* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
*/
#include <syslog.h>
#include "common.h"
long uptime(void)
{
struct sysinfo info;
sysinfo(&info);
return info.uptime;
}
static const char *saved_pidfile;
static void pidfile_delete(void)
{
if (saved_pidfile)
unlink(saved_pidfile);
}
static int pidfile_acquire(const char *pidfile)
{
int pid_fd;
if (!pidfile) return -1;
pid_fd = open(pidfile, O_CREAT|O_WRONLY|O_TRUNC, 0644);
if (pid_fd < 0) {
bb_perror_msg("cannot open pidfile %s", pidfile);
} else {
/* lockf(pid_fd, F_LOCK, 0); */
if (!saved_pidfile)
atexit(pidfile_delete);
saved_pidfile = pidfile;
}
return pid_fd;
}
static void pidfile_write_release(int pid_fd)
{
if (pid_fd < 0) return;
fdprintf(pid_fd, "%d\n", getpid());
/* lockf(pid_fd, F_UNLCK, 0); */
close(pid_fd);
}
void udhcp_make_pidfile(const char *pidfile)
{
int pid_fd;
/* Make sure fd 0,1,2 are open */
bb_sanitize_stdio();
/* Equivalent of doing a fflush after every \n */
setlinebuf(stdout);
/* Create pidfile */
pid_fd = pidfile_acquire(pidfile);
pidfile_write_release(pid_fd);
bb_info_msg("%s (v%s) started", applet_name, BB_VER);
}
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