* Copyright 2007, Jérôme Duval. All rights reserved.
* Distributed under the terms of the MIT License.
*/
#include <errno.h>
#include <stdio.h>
#include <string.h>
#include <sys/wait.h>
#include <unistd.h>
wait()/waitpid() should return -1 and set errno to ECHILD, since there
are no children to wait for.
*/
int
main()
{
int childStatus;
pid_t pid = wait(&childStatus);
printf("wait() returned %ld (%s)\n", pid, strerror(errno));
pid = waitpid(-1, &childStatus, 0);
printf("waitpid(-1, ...) returned %ld (%s)\n", pid, strerror(errno));
pid = waitpid(0, &childStatus, 0);
printf("waitpid(0, ...) returned %ld (%s)\n", pid, strerror(errno));
pid = waitpid(getpgrp(), &childStatus, 0);
printf("waitpid(%ld, ...) returned %ld (%s)\n", getpgrp(), pid, strerror(errno));
return 0;
}
