| /* 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; |
| } |
| |
| /* |
| * 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 fd = xopen(bb_dev_null, O_RDWR); |
| while (fd < 3) |
| fd = dup(fd); |
| close(fd); |
| } |
| |
| |
| void udhcp_background(const char *pidfile) |
| { |
| #ifdef __uClinux__ |
| bb_error_msg("cannot background in uclinux (yet)"); |
| #else /* __uClinux__ */ |
| int pid_fd; |
| |
| /* hold lock during fork. */ |
| pid_fd = pidfile_acquire(pidfile); |
| setsid(); |
| xdaemon(0, 0); |
| logmode &= ~LOGMODE_STDIO; |
| pidfile_write_release(pid_fd); |
| #endif /* __uClinux__ */ |
| } |
| |
| void udhcp_start_log_and_pid(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); |
| |
| if (ENABLE_FEATURE_UDHCP_SYSLOG) { |
| openlog(applet_name, LOG_PID, LOG_LOCAL0); |
| logmode |= LOGMODE_SYSLOG; |
| } |
| |
| bb_info_msg("%s (v%s) started", applet_name, BB_VER); |
| } |