File: 022_kernel_waitpid.c

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/*
   test that waitpid works expected way
 */
#include <sys/wait.h>
#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>

int main() {
	pid_t pid;
	int status;

	switch (pid = fork()) {
		case 0:
			execl("/bin/cp", "/bin/cp", "-a", "/tmp/test", "/tmp/test2", NULL);
			exit(0);

		case -1:
			perror("fork()");
			exit(1);

		default:
			sleep(1);
			if (-1 == waitpid(pid, &status, 0)) {
				perror("waitpid:cp");
				exit(2);
			}
			printf("waitpid: %x\n", status);
			exit(0);
	}
}