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mirror of https://github.com/systemd/systemd-stable.git synced 2024-12-27 03:21:32 +03:00
systemd-stable/man/event-quick-child.c
Zbigniew Jędrzejewski-Szmek 5ca99dfabd man: add example of sd_event_add_child()
The thing with blocking SIGCHLD is rather annoying. I think we could/should
make this automatic.
2022-01-05 15:19:13 +01:00

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C

/* SPDX-License-Identifier: CC0-1.0 */
#include <assert.h>
#include <stdio.h>
#include <unistd.h>
#include <sd-event.h>
int main(int argc, char **argv) {
pid_t pid = fork();
assert(pid >= 0);
/* SIGCHLD signal must be blocked for sd_event_add_child to work */
sigset_t ss;
sigemptyset(&ss);
sigaddset(&ss, SIGCHLD);
sigprocmask(SIG_BLOCK, &ss, NULL);
if (pid == 0) /* child */
sleep(1);
else { /* parent */
sd_event *e = NULL;
int r;
/* Create the default event loop */
sd_event_default(&e);
assert(e);
/* We create a floating child event source (attached to 'e').
* The default handler will be called with 666 as userdata, which
* will become the exit value of the loop. */
r = sd_event_add_child(e, NULL, pid, WEXITED, NULL, (void*) 666);
assert(r >= 0);
r = sd_event_loop(e);
assert(r == 666);
sd_event_unref(e);
}
return 0;
}