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Diffstat (limited to 'src/rc/supervise-daemon.c')
-rw-r--r--src/rc/supervise-daemon.c241
1 files changed, 108 insertions, 133 deletions
diff --git a/src/rc/supervise-daemon.c b/src/rc/supervise-daemon.c
index b655cd4b..cce0f9db 100644
--- a/src/rc/supervise-daemon.c
+++ b/src/rc/supervise-daemon.c
@@ -181,29 +181,21 @@ static void handle_signal(int sig)
{
int serrno = errno;
- syslog(LOG_WARNING, "caught signal %d", sig);
-
- if (sig == SIGTERM)
+ switch(sig) {
+ case SIGALRM:
+ do_healthcheck = 1;
+ break;
+ case SIGCHLD:
+ while (waitpid((pid_t)(-1), NULL, WNOHANG) > 0) {}
+ break;
+ case SIGTERM:
exiting = 1;
- /* Restore errno */
- errno = serrno;
- if (! exiting)
+ break;
+ default:
+ syslog(LOG_WARNING, "caught signal %d", sig);
re_exec_supervisor();
-}
-
-static void healthcheck(int sig)
-{
- if (sig == SIGALRM)
- do_healthcheck = 1;
-}
-
-static void reap_zombies(int sig)
-{
- int serrno;
- (void) sig;
-
- serrno = errno;
- while (waitpid((pid_t)(-1), NULL, WNOHANG) > 0) {}
+ }
+ /* Restore errno */
errno = serrno;
}
@@ -447,54 +439,32 @@ static void child_process(char *exec, char **argv)
static void supervisor(char *exec, char **argv)
{
FILE *fp;
- pid_t wait_pid;
+ int health_status;
+ int healthcheck_respawn;
int i;
int nkilled;
+ pid_t health_pid;
+ pid_t wait_pid;
+ sigset_t old_signals;
+ sigset_t signals;
+ struct sigaction sa;
struct timespec ts;
time_t respawn_now= 0;
time_t first_spawn= 0;
- pid_t health_pid;
- int health_status;
-#ifndef RC_DEBUG
- signal_setup_restart(SIGHUP, handle_signal);
- signal_setup_restart(SIGINT, handle_signal);
- signal_setup_restart(SIGQUIT, handle_signal);
- signal_setup_restart(SIGILL, handle_signal);
- signal_setup_restart(SIGABRT, handle_signal);
- signal_setup_restart(SIGFPE, handle_signal);
- signal_setup_restart(SIGSEGV, handle_signal);
- signal_setup_restart(SIGPIPE, handle_signal);
- signal_setup_restart(SIGALRM, handle_signal);
- signal_setup(SIGTERM, handle_signal);
- signal_setup(SIGCHLD, reap_zombies);
- signal_setup_restart(SIGUSR1, handle_signal);
- signal_setup_restart(SIGUSR2, handle_signal);
- signal_setup_restart(SIGBUS, handle_signal);
-#ifdef SIGPOLL
- signal_setup_restart(SIGPOLL, handle_signal);
-#endif
- signal_setup_restart(SIGPROF, handle_signal);
- signal_setup_restart(SIGSYS, handle_signal);
- signal_setup_restart(SIGTRAP, handle_signal);
- signal_setup_restart(SIGVTALRM, handle_signal);
- signal_setup_restart(SIGXCPU, handle_signal);
- signal_setup_restart(SIGXFSZ, handle_signal);
-#ifdef SIGEMT
- signal_setup_restart(SIGEMT, handle_signal);
-#endif
- signal_setup_restart(SIGIO, handle_signal);
-#ifdef SIGPWR
- signal_setup_restart(SIGPWR, handle_signal);
-#endif
-#ifdef SIGUNUSED
- signal_setup_restart(SIGUNUSED, handle_signal);
-#endif
-#ifdef SIGRTMIN
- for (i = SIGRTMIN; i <= SIGRTMAX; i++)
- signal_setup_restart(i, handle_signal);
-#endif
-#endif
+ /* block all signals we do not handle */
+ sigfillset(&signals);
+ sigdelset(&signals, SIGALRM);
+ sigdelset(&signals, SIGCHLD);
+ sigdelset(&signals, SIGTERM);
+ sigprocmask(SIG_SETMASK, &signals, &old_signals);
+
+ /* install signal handler */
+ memset(&sa, 0, sizeof(sa));
+ sa.sa_handler = handle_signal;
+ sigaction(SIGALRM, &sa, NULL);
+ sigaction(SIGCHLD, &sa, NULL);
+ sigaction(SIGTERM, &sa, NULL);
fp = fopen(pidfile, "w");
if (! fp)
@@ -515,89 +485,94 @@ static void supervisor(char *exec, char **argv)
/*
* Supervisor main loop
*/
- i = 0;
- if (healthcheckdelay) {
- signal_setup(SIGALRM, healthcheck);
+ if (healthcheckdelay)
alarm(healthcheckdelay);
- } else if (healthchecktimer) {
- signal_setup(SIGALRM, healthcheck);
+ else if (healthchecktimer)
alarm(healthchecktimer);
- }
while (!exiting) {
- wait_pid = wait(&i);
- if (wait_pid == -1) {
- if (do_healthcheck) {
- do_healthcheck = 0;
- alarm(0);
- syslog(LOG_DEBUG, "running health check for %s", svcname);
- health_pid = exec_service(svcname, "healthcheck");
- health_status = rc_waitpid(health_pid);
- if (WIFEXITED(health_status) && !WEXITSTATUS(health_status)) {
- alarm(healthchecktimer);
- continue;
- } else {
- syslog(LOG_WARNING, "health check for %s failed", svcname);
- health_pid = exec_service(svcname, "unhealthy");
- rc_waitpid(health_pid);
- syslog(LOG_INFO, "stopping %s, pid %d", exec, child_pid);
- nkilled = run_stop_schedule(applet, NULL, NULL, child_pid, 0,
- false, false, true);
- if (nkilled > 0)
- syslog(LOG_INFO, "killed %d processes", nkilled);
- else if (errno != 0)
- syslog(LOG_INFO, "Unable to kill %d: %s",
- child_pid, strerror(errno));
- }
- } else if (exiting ) {
- alarm(0);
+ healthcheck_respawn = 0;
+ wait_pid = waitpid(child_pid, &i, 0);
+ if (do_healthcheck) {
+ do_healthcheck = 0;
+ alarm(0);
+ syslog(LOG_DEBUG, "running health check for %s", svcname);
+ health_pid = exec_service(svcname, "healthcheck");
+ health_status = rc_waitpid(health_pid);
+ if (WIFEXITED(health_status) && WEXITSTATUS(health_status) == 0)
+ alarm(healthchecktimer);
+ else {
+ syslog(LOG_WARNING, "health check for %s failed", svcname);
+ health_pid = exec_service(svcname, "unhealthy");
+ rc_waitpid(health_pid);
syslog(LOG_INFO, "stopping %s, pid %d", exec, child_pid);
- nkilled = run_stop_schedule(applet, exec, NULL, child_pid, 0,
+ nkilled = run_stop_schedule(applet, NULL, NULL, child_pid, 0,
false, false, true);
- if (nkilled > 0)
- syslog(LOG_INFO, "killed %d processes", nkilled);
- continue;
+ if (nkilled < 0)
+ syslog(LOG_INFO, "Unable to kill %d: %s",
+ child_pid, strerror(errno));
+ else
+ healthcheck_respawn = 1;
}
- } else if (wait_pid == child_pid) {
+ }
+ if (exiting ) {
+ alarm(0);
+ syslog(LOG_INFO, "stopping %s, pid %d", exec, child_pid);
+ nkilled = run_stop_schedule(applet, NULL, NULL, child_pid, 0,
+ false, false, true);
+ if (nkilled > 0)
+ syslog(LOG_INFO, "killed %d processes", nkilled);
+ continue;
+ }
+ if (wait_pid == child_pid) {
if (WIFEXITED(i))
syslog(LOG_WARNING, "%s, pid %d, exited with return code %d",
exec, child_pid, WEXITSTATUS(i));
else if (WIFSIGNALED(i))
syslog(LOG_WARNING, "%s, pid %d, terminated by signal %d",
exec, child_pid, WTERMSIG(i));
- } else
- continue;
-
- ts.tv_sec = respawn_delay;
- ts.tv_nsec = 0;
- nanosleep(&ts, NULL);
- if (respawn_max > 0 && respawn_period > 0) {
- respawn_now = time(NULL);
- if (first_spawn == 0)
- first_spawn = respawn_now;
- if (respawn_now - first_spawn > respawn_period) {
- respawn_count = 0;
- first_spawn = 0;
- } else
- respawn_count++;
- if (respawn_count > respawn_max) {
- syslog(LOG_WARNING,
- "respawned \"%s\" too many times, exiting", exec);
- exiting = 1;
- continue;
- }
}
- alarm(0);
- child_pid = fork();
- if (child_pid == -1)
- eerrorx("%s: fork: %s", applet, strerror(errno));
- if (child_pid == 0)
- child_process(exec, argv);
- if (healthcheckdelay) {
- signal_setup(SIGALRM, healthcheck);
- alarm(healthcheckdelay);
- } else if (healthchecktimer) {
- signal_setup(SIGALRM, healthcheck);
- alarm(healthchecktimer);
+ if (wait_pid == child_pid || healthcheck_respawn) {
+ do_healthcheck = 0;
+ healthcheck_respawn = 0;
+ alarm(0);
+ if (respawn_max > 0 && respawn_period > 0) {
+ respawn_now = time(NULL);
+ if (first_spawn == 0)
+ first_spawn = respawn_now;
+ if (respawn_now - first_spawn > respawn_period) {
+ respawn_count = 0;
+ first_spawn = 0;
+ } else
+ respawn_count++;
+ if (respawn_count > respawn_max) {
+ syslog(LOG_WARNING,
+ "respawned \"%s\" too many times, exiting", exec);
+ exiting = 1;
+ continue;
+ }
+ }
+ alarm(0);
+ ts.tv_sec = respawn_delay;
+ ts.tv_nsec = 0;
+ nanosleep(&ts, NULL);
+ child_pid = fork();
+ if (child_pid == -1) {
+ syslog(LOG_ERR, "%s: fork: %s", applet, strerror(errno));
+ exit(EXIT_FAILURE);
+ }
+ if (child_pid == 0) {
+ sigprocmask(SIG_SETMASK, &old_signals, NULL);
+ memset(&sa, 0, sizeof(sa));
+ sa.sa_handler = SIG_DFL;
+ sigaction(SIGALRM, &sa, NULL);
+ sigaction(SIGCHLD, &sa, NULL);
+ sigaction(SIGTERM, &sa, NULL);
+ child_process(exec, argv);
+ }
+ if (healthcheckdelay)
+ alarm(healthcheckdelay);
+ else if (healthchecktimer)
+ alarm(healthchecktimer);
}
}
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-10 13:29:50 +0000