sigchld.c

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/wait.h>

int main(void)
{
	pid_t pid = fork();

	if (pid < 0) {
		perror("fork");
		exit(1);
	}

	if (pid == 0) {
		// Child process, just do nothing
		while (1) sleep(1);
		exit(0);
	}

	// Parent process, wait on the child proc forever
	printf("waiting on child pid: %d\n", pid);

	int status;
	waitpid(pid, &status, 0);

	printf("status: %d\n", status);

	if (WIFSIGNALED(status)) {
		printf(" SIGCHLD\n");

		if (WTERMSIG(status) == SIGTERM) {
			printf(" child rx'd SIGTERM\n");
		}
	}

	return 0;
}