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authorEvgeny Vereshchagin <evvers@ya.ru>2016-04-05 00:27:15 +0000
committerEvgeny Vereshchagin <evvers@ya.ru>2016-04-05 14:34:04 +0000
commit5488e52d285314c7535c87ee9aecadbc169db006 (patch)
treef34e5caeb53640c058bc15f390bae9c5d219bdbd /src
parent0ffebd5abfa53945c83c03ba4442c61cc46a6f31 (diff)
activate: improve SIGCHLD handler
* Don't lose children exit codes * Don't receive notification when child processes stop Eliminates annoying "Child died"-messages: $ ./systemd-socket-activate -l 2000 --inetd -a cat ^Z [1]+ Stopped ./systemd-socket-activate -l 2000 --inetd -a cat $ bg %1 [1]+ ./systemd-socket-activate -l 2000 --inetd -a cat & Child 15657 died with code 20 $ ps u 15657 USER PID %CPU %MEM VSZ RSS TTY STAT START TIME COMMAND ubuntu 15657 0.0 0.0 4540 680 pts/2 S 00:34 0:00 cat * Don't fail to reap some zombie children Fixes $ ./systemd-socket-activate -l 2000 --inetd -a cat & $ for i in {1..1000}; do echo a | nc localhost 2000 & done $ ps f ... 18235 pts/2 Ss 0:01 -bash 15849 pts/2 S 0:00 \_ ./systemd-socket-activate -l 2000 --inetd -a cat 16081 pts/2 Z 0:00 | \_ [cat] <defunct> 16381 pts/2 Z 0:00 | \_ [cat] <defunct> and many more zombies ...
Diffstat (limited to 'src')
-rw-r--r--src/activate/activate.c24
1 files changed, 18 insertions, 6 deletions
diff --git a/src/activate/activate.c b/src/activate/activate.c
index 8ac8dd8e72..a0cfc22000 100644
--- a/src/activate/activate.c
+++ b/src/activate/activate.c
@@ -316,19 +316,31 @@ static int do_accept(const char* name, char **argv, char **envp, int fd) {
}
/* SIGCHLD handler. */
-static void sigchld_hdl(int sig, siginfo_t *t, void *data) {
+static void sigchld_hdl(int sig) {
PROTECT_ERRNO;
- log_info("Child %d died with code %d", t->si_pid, t->si_status);
+ for (;;) {
+ siginfo_t si;
+ int r;
- /* Wait for a dead child. */
- (void) waitpid(t->si_pid, NULL, 0);
+ si.si_pid = 0;
+ r = waitid(P_ALL, 0, &si, WEXITED|WNOHANG);
+ if (r < 0) {
+ if (errno != ECHILD)
+ log_error_errno(errno, "Failed to reap children: %m");
+ return;
+ }
+ if (si.si_pid == 0)
+ return;
+
+ log_info("Child %d died with code %d", si.si_pid, si.si_status);
+ }
}
static int install_chld_handler(void) {
static const struct sigaction act = {
- .sa_flags = SA_SIGINFO,
- .sa_sigaction = sigchld_hdl,
+ .sa_flags = SA_NOCLDSTOP,
+ .sa_handler = sigchld_hdl,
};
int r;