forkdemo1.c

unix linux 编程实践源代码

/*  forkdemo1.c
 *	shows how fork creates two processes, distinguishable
 *	by the different return values from fork()
 */

#include	<stdio.h>

main()
{
	int	ret_from_fork, mypid;

	mypid = getpid();			   /* who am i?  	*/
	printf("Before: my pid is %d\n", mypid);   /* tell the world	*/

	ret_from_fork = fork();

	sleep(1);
	printf("After: my pid is %d, fork() said %d\n",
			getpid(), ret_from_fork);
}