socketpair 使用

最新推荐文章于 2019-11-06 10:43:37 发布

原创最新推荐文章于 2019-11-06 10:43:37 发布 · 384 阅读

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本文介绍了一个使用socketpair进行父子进程间通信的C语言程序实例。该程序通过创建一对已连接的流套接字来实现双向通信，展示了父进程与子进程如何发送字符并接收反馈。

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#include <stdio.h> 
#include <sys/socket.h>
#include <sys/types.h>

int main()
{
    int sync_fds[2];
    if(socketpair(AF_UNIX, SOCK_STREAM, 0, sync_fds)){
        perror("socketpair failed...\n");
        return 0;
    }

    int child_pid = fork();
    if(child_pid == -1){
        perror("fork failed ...\n");
        close(sync_fds[0]);
        close(sync_fds[1]);
        return 0;
    }

    if(child_pid){
        close(sync_fds[0]);
        char buff;
        while(1){
            sleep(1);
            send(sync_fds[1], "C", 1, MSG_NOSIGNAL);
            printf("parent: send c ....\n");
            read(sync_fds[1], &buff, 1);
            printf("parent: read %s\n", &buff);
        }
    }else{
        close(sync_fds[1]);
        char buff;
        while(1){
            int read_ret = read(sync_fds[0], &buff, 1);
            printf("child read %s\n", &buff);
            send(sync_fds[0], "D", 1, MSG_NOSIGNAL);
            printf("child send d ...\n");
        }
    }
    return 0;
}

输出结果：

parent: send c ....
child read C
child send d ...
parent: read D
parent: send c ....
child read C
child send d ...
parent: read D
parent: send c ....
child read C
child send d ...
parent: read D