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  • Socketpair 简介

    socketpair - a slight generalization of pipes used for two-way stream communication.

    以下内容来自:匠意雕码 http://my.oschina.net/zengsai/blog/12583

    今天用了一个从没玩过的socket函数socketpair(),它的作用是在进程内创建一对sock连接。乍一看好像也没什么,但是配合fork()使用之后就是各种欢乐。如下。

    #define STRING1 "message from parent"
    #define STRING2 "messgae from child"

    #include <sys/types.h>

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

    main()
    {
    int sockets[2], child;
    char buf[1024];

    /* Get the socket pair */
    if (socketpair(AF_UNIX, SOCK_STREAM,
    0, sockets) < 0) {
    printf("error %d on socketpair\n", errno);
    exit(1);
    }

    /* create child process */
    if ((child = fork()) == -1) {
    printf("fork error %d\n", errno);
    exit(1);
    }

    if (child != 0) { /* this is the parent */
    /* close child's end of socket */
    close(sockets[0]);

    /* read message from child */
    if (read(sockets[1], buf, sizeof(buf)) < 0) {
    printf("error %d reading socket\n", errno);
    exit(1);
    }
    printf("-->%s\n", buf);

    /* write message to child */
    if (write(sockets[1],
    STRING1, sizeof(STRING1)) < 0) {
    printf("error %d writing socket\n", errno);
    exit(1);
    }

    /* finished */
    close(sockets[1]);

    } else { /* the child */

    /* close parent's end of socket */
    close(sockets[1]);

    /* send message to parent */
    if (write(sockets[0], STRING2,
    sizeof(STRING1)) < 0) {

    printf("error %d writing socket\n", errno);
    exit(1);
    }

    /* get message from parent */

    if (read(sockets[0],
    buf, sizeof(buf)) < 0) {
    printf("error %d reading socket\n", errno);
    exit(1);
    }
    printf("-->%s\n", buf);

    /* finished */
    close(sockets[0]);
    }
    }

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  • 原文地址:https://www.cnblogs.com/xiayong123/p/3717213.html
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