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service: warn if a service fails to write its PID file

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Warn if a service promises to write a PID file (using 'PIDFile=' in the
unit file or '# pidfile:' in SysV header), but fails to keep the
promise.

This warning will likely trigger also for the forking services with a
racy daemonization, which exit the original process before the PID file
is written.
This commit is contained in:
Michal Schmidt 2011-09-22 13:10:32 +02:00
parent 0cdad5c052
commit 5375410bb2
1 changed files with 10 additions and 6 deletions
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16
src/service.c
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@ -1281,7 +1281,7 @@ static void service_dump(Unit *u, FILE *f, const char *prefix) {
free(p2);
}
static int service_load_pid_file(Service *s) {
static int service_load_pid_file(Service *s, bool warn_if_missing) {
char *k;
int r;
pid_t pid;
@ -1291,8 +1291,12 @@ static int service_load_pid_file(Service *s) {
if (!s->pid_file)
return -ENOENT;
if ((r = read_one_line_file(s->pid_file, &k)) < 0)
if ((r = read_one_line_file(s->pid_file, &k)) < 0) {
if (warn_if_missing)
log_warning("Failed to read PID file %s after %s. The service might be broken.",
s->pid_file, service_state_to_string(s->state));
return r;
}
r = parse_pid(k, &pid);
free(k);
@ -2604,7 +2608,7 @@ static void service_sigchld_event(Unit *u, pid_t pid, int code, int status) {
/* Forking services may occasionally move to a new PID.
* As long as they update the PID file before exiting the old
* PID, they're fine. */
if (service_load_pid_file(s) == 0)
if (service_load_pid_file(s, false) == 0)
return;
s->main_pid = 0;
@ -2736,7 +2740,7 @@ static void service_sigchld_event(Unit *u, pid_t pid, int code, int status) {
* START_POST script */
if (success) {
service_load_pid_file(s);
service_load_pid_file(s, !s->exec_command[SERVICE_EXEC_START_POST]);
service_search_main_pid(s);
service_enter_start_post(s);
@ -2747,7 +2751,7 @@ static void service_sigchld_event(Unit *u, pid_t pid, int code, int status) {
case SERVICE_START_POST:
if (success) {
service_load_pid_file(s);
service_load_pid_file(s, true);
service_search_main_pid(s);
}
@ -2757,7 +2761,7 @@ static void service_sigchld_event(Unit *u, pid_t pid, int code, int status) {
case SERVICE_RELOAD:
if (success) {
service_load_pid_file(s);
service_load_pid_file(s, true);
service_search_main_pid(s);
}