#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <errno.h>

void fatal(char *s)
{
	perror(s);
	exit(1);
}
main()
{
	pid_t pid;
	switch(pid = fork()) {
		case -1: 
			fatal("fork failed"); break;
		case 0:
			execl("/bin/ls", "ls", "-l", (char *)0);
			fatal("exec failed");
			break;
		default:
			wait((int *)0);
			printf("ls competato\n");
			exit(0);
	}
}