/* SPDX-License-Identifier: MIT-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;

}