/* forkexec: create a new process. */
/*  The child runs "ls -aF /". The parent wakes up after 5 seconds */
/* Paul Krzyzanowski */

#include <stdlib.h>	/* needed to define exit() */
#include <unistd.h>	/* needed for fork() and getpid() */
#include <stdio.h>	/* needed for printf() */

int
main(int argc, char **argv) {
	void runit(void);
	int pid;	/* process ID */

	switch (pid = fork()) {
	case 0:		/* a fork returns 0 to the child */
		runit();
		break;

	default:	/* a fork returns a pid to the parent */
		sleep(5);	/* sleep for 5 seconds */
		printf("I'm still here!\n");
		break;

	case -1:	/* something went wrong */
		perror("fork");
		exit(1);
	}
	exit(0);
}

void
runit(void) {
	printf("About to run ls\n");
	execlp("ls", "ls", "-aF", "/", (char*)0);
	perror("execlp");	/* if we get here, execlp failed */
	exit(1);
}