153 lines
3.4 KiB
C
153 lines
3.4 KiB
C
/* common.c
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*
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* Functions to assist in the writing and removing of pidfiles.
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*
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* Russ Dill <Russ.Dill@asu.edu> Soptember 2001
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* Rewrited by Vladimir Oleynik <dzo@simtreas.ru> (C) 2003
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <fcntl.h>
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#include <unistd.h>
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#include <errno.h>
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#include <string.h>
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#include <stdlib.h>
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#include <signal.h>
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#include <sys/socket.h>
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#include "common.h"
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static int daemonized;
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#ifdef CONFIG_FEATURE_UDHCP_SYSLOG
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void udhcp_logging(int level, const char *fmt, ...)
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{
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int e = errno;
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va_list p;
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va_list p2;
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va_start(p, fmt);
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__va_copy(p2, p);
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if(!daemonized) {
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vprintf(fmt, p);
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putchar('\n');
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fflush(stdout);
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errno = e;
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}
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vsyslog(level, fmt, p2);
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va_end(p);
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}
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void start_log(const char *client_server)
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{
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openlog(bb_applet_name, LOG_PID | LOG_CONS, LOG_LOCAL0);
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udhcp_logging(LOG_INFO, "%s (v%s) started", client_server, VERSION);
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}
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#else
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static char *syslog_level_msg[] = {
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[LOG_EMERG] = "EMERGENCY!",
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[LOG_ALERT] = "ALERT!",
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[LOG_CRIT] = "critical!",
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[LOG_WARNING] = "warning",
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[LOG_ERR] = "error",
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[LOG_INFO] = "info",
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[LOG_DEBUG] = "debug"
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};
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void udhcp_logging(int level, const char *fmt, ...)
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{
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int e = errno;
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va_list p;
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va_start(p, fmt);
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if(!daemonized) {
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printf("%s, ", syslog_level_msg[level]);
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errno = e;
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vprintf(fmt, p);
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putchar('\n');
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fflush(stdout);
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}
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va_end(p);
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}
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void start_log(const char *client_server)
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{
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udhcp_logging(LOG_INFO, "%s (v%s) started", client_server, VERSION);
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}
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#endif
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static const char *saved_pidfile;
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static void exit_fun(void)
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{
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if (saved_pidfile) unlink(saved_pidfile);
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}
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void background(const char *pidfile)
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{
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int pid_fd = -1;
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if (pidfile) {
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pid_fd = open(pidfile, O_CREAT | O_WRONLY, 0644);
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if (pid_fd < 0) {
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LOG(LOG_ERR, "Unable to open pidfile %s: %m", pidfile);
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} else {
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lockf(pid_fd, F_LOCK, 0);
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if(!saved_pidfile)
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atexit(exit_fun); /* set atexit one only */
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saved_pidfile = pidfile; /* but may be rewrite */
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}
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}
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while (pid_fd >= 0 && pid_fd < 3) pid_fd = dup(pid_fd); /* don't let daemon close it */
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if (daemon(0, 0) == -1) {
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perror("fork");
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exit(1);
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}
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daemonized++;
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if (pid_fd >= 0) {
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FILE *out;
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if ((out = fdopen(pid_fd, "w")) != NULL) {
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fprintf(out, "%d\n", getpid());
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fclose(out);
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}
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lockf(pid_fd, F_UNLCK, 0);
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close(pid_fd);
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}
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}
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/* Signal handler */
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int udhcp_signal_pipe[2];
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static void signal_handler(int sig)
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{
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if (send(udhcp_signal_pipe[1], &sig, sizeof(sig), MSG_DONTWAIT) < 0) {
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LOG(LOG_ERR, "Could not send signal: %m");
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}
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}
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void udhcp_set_signal_pipe(int sig_add)
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{
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socketpair(AF_UNIX, SOCK_STREAM, 0, udhcp_signal_pipe);
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signal(SIGUSR1, signal_handler);
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signal(SIGTERM, signal_handler);
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if(sig_add)
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signal(sig_add, signal_handler);
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}
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