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shutdown: just call exit() if we are in a container

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This commit is contained in:
Lennart Poettering 2011-03-14 05:40:15 +01:00
parent c4f8bd1aef
commit 40e85d0019
1 changed files with 73 additions and 85 deletions
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158
src/shutdown.c
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@ -96,125 +96,107 @@ static int killall(int sign) {
return n_processes;
}
static int send_signal(int sign) {
sigset_t mask, oldmask;
static void wait_for_children(int n_processes, sigset_t *mask) {
usec_t until;
assert(mask);
until = now(CLOCK_MONOTONIC) + TIMEOUT_USEC;
for (;;) {
struct timespec ts;
int k;
usec_t n;
for (;;) {
pid_t pid = waitpid(-1, NULL, WNOHANG);
if (pid == 0)
break;
if (pid < 0 && errno == ECHILD)
return;
if (n_processes > 0)
if (--n_processes == 0)
return;
}
n = now(CLOCK_MONOTONIC);
if (n >= until)
return;
timespec_store(&ts, until - n);
if ((k = sigtimedwait(mask, NULL, &ts)) != SIGCHLD) {
if (k < 0 && errno != EAGAIN) {
log_error("sigtimedwait() failed: %m");
return;
}
if (k >= 0)
log_warning("sigtimedwait() returned unexpected signal.");
}
}
}
static void send_signal(int sign) {
sigset_t mask, oldmask;
int n_processes;
struct timespec ts;
assert_se(sigemptyset(&mask) == 0);
assert_se(sigaddset(&mask, SIGCHLD) == 0);
if (sigprocmask(SIG_BLOCK, &mask, &oldmask) != 0)
return -errno;
assert_se(sigprocmask(SIG_BLOCK, &mask, &oldmask) == 0);
if (kill(-1, SIGSTOP) < 0)
if (kill(-1, SIGSTOP) < 0 && errno != ESRCH)
log_warning("kill(-1, SIGSTOP) failed: %m");
n_processes = killall(sign);
if (kill(-1, SIGCONT) < 0)
if (kill(-1, SIGCONT) < 0 && errno != ESRCH)
log_warning("kill(-1, SIGCONT) failed: %m");
if (n_processes <= 0)
goto finish;
until = now(CLOCK_MONOTONIC) + TIMEOUT_USEC;
for (;;) {
int k;
usec_t n = now(CLOCK_MONOTONIC);
for (;;) {
pid_t pid = waitpid(-1, NULL, WNOHANG);
if (pid == 0)
break;
else if (pid < 0 && errno == ECHILD) {
n_processes = 0;
goto finish;
}
if (--n_processes == 0)
goto finish;
}
if (n >= until)
goto finish;
timespec_store(&ts, until - n);
if ((k = sigtimedwait(&mask, NULL, &ts)) != SIGCHLD) {
if (k >= 0)
log_warning("sigtimedwait() returned unexpected signal.");
if (k < 0 && errno != EAGAIN)
log_warning("sigtimedwait() failed: %m");
}
}
wait_for_children(n_processes, &mask);
finish:
sigprocmask(SIG_SETMASK, &oldmask, NULL);
return n_processes;
}
static int rescue_send_signal(int sign) {
static void ultimate_send_signal(int sign) {
sigset_t mask, oldmask;
usec_t until;
struct timespec ts;
int r;
sigemptyset(&mask);
sigaddset(&mask, SIGCHLD);
if (sigprocmask(SIG_BLOCK, &mask, &oldmask) != 0)
return -errno;
assert_se(sigemptyset(&mask) == 0);
assert_se(sigaddset(&mask, SIGCHLD) == 0);
assert_se(sigprocmask(SIG_BLOCK, &mask, &oldmask) == 0);
if (kill(-1, SIGSTOP) < 0)
if (kill(-1, SIGSTOP) < 0 && errno != ESRCH)
log_warning("kill(-1, SIGSTOP) failed: %m");
r = kill(-1, sign);
if (r < 0)
log_warning("kill(-1, %d) failed: %m", sign);
if (r < 0 && errno != ESRCH)
log_warning("kill(-1, %s) failed: %m", signal_to_string(sign));
if (kill(-1, SIGCONT) < 0)
if (kill(-1, SIGCONT) < 0 && errno != ESRCH)
log_warning("kill(-1, SIGCONT) failed: %m");
if (r < 0)
goto finish;
until = now(CLOCK_MONOTONIC) + TIMEOUT_USEC;
for (;;) {
int k;
usec_t n = now(CLOCK_MONOTONIC);
for (;;) {
pid_t pid = waitpid(-1, NULL, WNOHANG);
if (pid == 0)
break;
else if (pid < 0 && errno == ECHILD)
goto finish;
}
if (n >= until)
goto finish;
timespec_store(&ts, until - n);
if ((k = sigtimedwait(&mask, NULL, &ts)) != SIGCHLD) {
if (k >= 0)
log_warning("sigtimedwait() returned unexpected signal.");
if (k < 0 && errno != EAGAIN)
log_warning("sigtimedwait() failed: %m");
}
}
wait_for_children(0, &mask);
finish:
sigprocmask(SIG_SETMASK, &oldmask, NULL);
return r;
}
int main(int argc, char *argv[]) {
int cmd, r;
unsigned retries;
bool need_umount = true, need_swapoff = true, need_loop_detach = true, need_dm_detach = true;
bool killed_everbody = false;
bool killed_everbody = false, in_container;
log_parse_environment();
log_set_target(LOG_TARGET_CONSOLE); /* syslog will die if not gone yet */
@ -232,6 +214,8 @@ int main(int argc, char *argv[]) {
goto error;
}
in_container = detect_container(NULL) > 0;
if (streq(argv[1], "reboot"))
cmd = RB_AUTOBOOT;
else if (streq(argv[1], "poweroff"))
@ -251,14 +235,13 @@ int main(int argc, char *argv[]) {
log_warning("Cannot lock process memory: %m");
log_info("Sending SIGTERM to remaining processes...");
r = send_signal(SIGTERM);
if (r < 0)
log_warning("Failed to send SIGTERM to remaining processes: %s", strerror(r));
send_signal(SIGTERM);
log_info("Sending SIGKILL to remaining processes...");
r = send_signal(SIGKILL);
if (r < 0)
log_warning("Failed to send SIGKILL to remaining processes: %s", strerror(r));
send_signal(SIGKILL);
if (in_container)
need_swapoff = false;
/* Unmount all mountpoints, swaps, and loopback devices */
for (retries = 0; retries < FINALIZE_ATTEMPTS; retries++) {
@ -325,8 +308,8 @@ int main(int argc, char *argv[]) {
}
log_warning("Cannot finalize remaining file systems and devices, trying to kill remaining processes.");
rescue_send_signal(SIGTERM);
rescue_send_signal(SIGKILL);
ultimate_send_signal(SIGTERM);
ultimate_send_signal(SIGKILL);
killed_everbody = true;
}
@ -338,6 +321,11 @@ int main(int argc, char *argv[]) {
execute_directory(SYSTEM_SHUTDOWN_PATH, NULL, NULL);
/* If we are in a container, just exit, this will kill our
* container for good. */
if (in_container)
exit(0);
sync();
if (cmd == LINUX_REBOOT_CMD_KEXEC) {