Race condition

[BusiestBeaver]

blog/way_too_many_ways_to_wait_for_a_child_process_with_a_timeout.html

Lines 336 to 360 in ebb19f4

	int child_pid = fork();
	if (-1 == child_pid) {
	return errno;
	}
	if (0 == child_pid) { // Child
	argv += 1;
	if (-1 == execvp(argv[0], argv)) {
	return errno;
	}
	__builtin_unreachable();
	}
	sigset_t sigset = {0};
	sigemptyset(&sigset);
	sigaddset(&sigset, SIGCHLD);
	siginfo_t siginfo = {0};
	struct timespec timeout = {
	.tv_sec = wait_ms / 1000,
	.tv_nsec = (wait_ms % 1000) * 1000 * 1000,
	};
	int sig = sigtimedwait(&sigset, &siginfo, &timeout);

SIGCHLD may come after fork() and before sigtimedwait().