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76 lines
1.5 KiB
C
76 lines
1.5 KiB
C
/* vi: set sw=4 ts=4: */
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/* common.c
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*
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* Functions for debugging and logging as well as some other
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* simple helper functions.
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*
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* Russ Dill <Russ.Dill@asu.edu> 2001-2003
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* Rewritten by Vladimir Oleynik <dzo@simtreas.ru> (C) 2003
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*
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* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
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*/
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#include <syslog.h>
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#include "common.h"
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long uptime(void)
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{
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struct sysinfo info;
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sysinfo(&info);
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return info.uptime;
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}
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/*
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* This function makes sure our first socket calls
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* aren't going to fd 1 (printf badness...) and are
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* not later closed by daemon()
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*/
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static inline void sanitize_fds(void)
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{
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int fd = xopen(bb_dev_null, O_RDWR);
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while (fd < 3)
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fd = dup(fd);
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close(fd);
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}
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void udhcp_background(const char *pidfile)
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{
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#ifdef __uClinux__
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bb_error_msg("cannot background in uclinux (yet)");
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#else /* __uClinux__ */
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int pid_fd;
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/* hold lock during fork. */
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pid_fd = pidfile_acquire(pidfile);
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setsid();
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xdaemon(0, 0);
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logmode &= ~LOGMODE_STDIO;
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pidfile_write_release(pid_fd);
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#endif /* __uClinux__ */
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}
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void udhcp_start_log_and_pid(const char *pidfile)
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{
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int pid_fd;
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/* Make sure our syslog fd isn't overwritten */
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sanitize_fds();
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/* do some other misc startup stuff while we are here to save bytes */
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pid_fd = pidfile_acquire(pidfile);
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pidfile_write_release(pid_fd);
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/* equivelent of doing a fflush after every \n */
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setlinebuf(stdout);
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if (ENABLE_FEATURE_UDHCP_SYSLOG) {
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openlog(applet_name, LOG_PID, LOG_LOCAL0);
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logmode |= LOGMODE_SYSLOG;
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}
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bb_info_msg("%s (v%s) started", applet_name, BB_VER);
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}
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