fork的示例

 

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

main(){
	
	int ret_from_fork,mypid;

	mypid = getpid();
	printf("Before:my pid is %d\n",mypid);

	ret_from_fork = fork();

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

}