fork.c

linux多线程编程的例程

/*fork.c*/
#include <sys/types.h>
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>

int main(void)
{
	pid_t result;
/*调用fork函数，其返回值为result*/
	result = fork();
/*通过result的值来判断fork函数的返回情况，首先进行出错处理*/
	if(result == -1){
		perror("fork");
		exit;
	}
/*返回值为0代表子进程*/
	else if(result == 0){
	printf("The return value is %d\nIn child process!!\nMy PID is %d\n",result,getpid());
}
/*返回值大于0代表父进程*/
	else 
	{
	printf("The return value is %d\nIn father process!!\nMy PID is %d\n",result,getpid());
	}
}