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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