+/* vi: set sw=4 ts=4: */
/* common.c
*
- * Functions to assist in the writing and removing of pidfiles.
+ * Functions for debugging and logging as well as some other
+ * simple helper functions.
*
- * Russ Dill <Russ.Dill@asu.edu> Soptember 2001
- * Rewrited by Vladimir Oleynik <dzo@simtreas.ru> (C) 2003
+ * 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.
+ * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
*/
#include <fcntl.h>
#include <string.h>
#include <stdlib.h>
#include <signal.h>
+#include <paths.h>
#include <sys/socket.h>
+#include <stdarg.h>
+#include <syslog.h>
#include "common.h"
+#include "pidfile.h"
static int daemonized;
-#ifdef CONFIG_FEATURE_UDHCP_SYSLOG
-
-void udhcp_logging(int level, const char *fmt, ...)
+long uptime(void)
{
- int e = errno;
- va_list p;
- va_list p2;
-
- va_start(p, fmt);
- __va_copy(p2, p);
- if(!daemonized) {
- vprintf(fmt, p);
- putchar('\n');
- errno = e;
- }
- vsyslog(level, fmt, p2);
- va_end(p);
+ struct sysinfo info;
+ sysinfo(&info);
+ return info.uptime;
}
-void start_log(const char *client_server)
+/*
+ * 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)
{
- openlog(bb_applet_name, LOG_PID | LOG_CONS, LOG_LOCAL0);
- udhcp_logging(LOG_INFO, "%s (v%s) started", client_server, VERSION);
+ int fd = open(bb_dev_null, O_RDWR, 0);
+ if (fd < 0)
+ return;
+ while (fd < 3)
+ fd = dup(fd);
+ close(fd);
}
-#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, ...)
-{
- int e = errno;
- va_list p;
-
- va_start(p, fmt);
- if(!daemonized) {
- printf("%s, ", syslog_level_msg[level]);
- errno = e;
- vprintf(fmt, p);
- putchar('\n');
- }
- va_end(p);
-}
-void start_log(const char *client_server)
+void udhcp_background(const char *pidfile)
{
- udhcp_logging(LOG_INFO, "%s (v%s) started", client_server, VERSION);
+#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);
+ daemonized++;
+ logmode &= ~LOGMODE_STDIO;
+ pidfile_write_release(pid_fd);
+#endif /* __uClinux__ */
}
-#endif
-
-static const char *saved_pidfile;
-static void exit_fun(void)
+void udhcp_start_log_and_pid(const char *client_server, const char *pidfile)
{
- if (saved_pidfile) unlink(saved_pidfile);
-}
+ int pid_fd;
-void background(const char *pidfile)
-{
- int pid_fd = -1;
+ /* Make sure our syslog fd isn't overwritten */
+ sanitize_fds();
- if (pidfile) {
- pid_fd = open(pidfile, O_CREAT | O_WRONLY, 0644);
- if (pid_fd < 0) {
- LOG(LOG_ERR, "Unable to open pidfile %s: %m", pidfile);
- } else {
- lockf(pid_fd, F_LOCK, 0);
- if(!saved_pidfile)
- atexit(exit_fun); /* set atexit one only */
- saved_pidfile = pidfile; /* but may be rewrite */
- }
- }
- while (pid_fd >= 0 && pid_fd < 3) pid_fd = dup(pid_fd); /* don't let daemon close it */
- if (daemon(0, 0) == -1) {
- perror("fork");
- exit(1);
- }
- daemonized++;
- if (pid_fd >= 0) {
- FILE *out;
+ /* do some other misc startup stuff while we are here to save bytes */
+ pid_fd = pidfile_acquire(pidfile);
+ pidfile_write_release(pid_fd);
- if ((out = fdopen(pid_fd, "w")) != NULL) {
- fprintf(out, "%d\n", getpid());
- fclose(out);
- }
- lockf(pid_fd, F_UNLCK, 0);
- close(pid_fd);
- }
-}
+ /* equivelent of doing a fflush after every \n */
+ setlinebuf(stdout);
-/* Signal handler */
-int udhcp_signal_pipe[2];
-static void signal_handler(int sig)
-{
- if (send(udhcp_signal_pipe[1], &sig, sizeof(sig), MSG_DONTWAIT) < 0) {
- LOG(LOG_ERR, "Could not send signal: %m");
+ if (ENABLE_FEATURE_UDHCP_SYSLOG) {
+ openlog(client_server, LOG_PID, LOG_LOCAL0);
+ logmode |= LOGMODE_SYSLOG;
}
-}
-void udhcp_set_signal_pipe(int sig_add)
-{
- socketpair(AF_UNIX, SOCK_STREAM, 0, udhcp_signal_pipe);
- signal(SIGUSR1, signal_handler);
- signal(SIGTERM, signal_handler);
- if(sig_add)
- signal(sig_add, signal_handler);
+ bb_info_msg("%s (v%s) started", client_server, BB_VER);
}
projects / oweals / busybox.git / blobdiff