socketpair使用

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#include <sys/socket.h>#include <netinet/in.h>#include <stdlib.h>#include <stdio.h>#include <unistd.h>// Linux环境下使用socketpair函数创造一对未命名的、相互连接的UNIX域套接字。void err_sys(const char *errmsg);int main(void){    int sockfd[2]; // 其中sockfd[0]用于读, sockfd[1]用于写.    pid_t pid;     if( (socketpair(AF_LOCAL, SOCK_STREAM, 0, sockfd)) < 0 ) {        err_sys("socketpair");    }    if( (pid = fork()) == -1 ) {        err_sys("fork");    } else if (pid == 0) { /* child process */        char s[BUFSIZ];        ssize_t n;        close(sockfd[1]); //write port        if( (n = read(sockfd[0], s, sizeof(s))) < 0 ) {            err_sys("read error!\n");        }        printf("read:%s\n", s);        close(sockfd[0]);        exit(0);    } else if( pid > 0 ) { /* parent process */        char buf[] = "hello china";        ssize_t n;        close(sockfd[0]); //read port        if( (n = write(sockfd[1], buf, sizeof(buf))) < 0 ) {            err_sys("write error!\n");        }        printf("write:%s\n", buf);        close(sockfd[1]);        wait(NULL);    }    return 0;}void err_sys(const char *errmsg){    perror(errmsg);    exit(1);}

</pre><pre code_snippet_id="642894" snippet_file_name="blog_20150413_3_3442200" name="code" class="cpp">

在我的测试结果里面, 是父进程先返回, 子进程后返回..

父子进程可以通过这个配对的套接字通信.....

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