linux进程间通信--socket套接字 实例代码

可以实现通信的代码实现，拿去用！

原文来自：http://blog.chinaunix.net/uid-26790551-id-3171897.html

服务器端：

    #include <stdio.h>    #include <stdlib.h>    #include <string.h>    #include <sys/socket.h>    #include <sys/un.h>    #include <unistd.h>    #define UNIX_DOMAIN "/tmp/UNIX.domain"    int main(void)    {      int lsn_fd, apt_fd;      struct sockaddr_un srv_addr;      struct sockaddr_un clt_addr;      socklen_t clt_len;      int ret;      int i;      char recv_buf[1024];      char send_buf[1024];            //create socket to bind local IP and PORT      lsn_fd = socket(PF_UNIX, SOCK_STREAM, 0);      if(lsn_fd < 0)      {        perror("can't create communication socket!");        return 1;      }            //create local IP and PORT      srv_addr.sun_family = AF_UNIX;      strncpy(srv_addr.sun_path, UNIX_DOMAIN, sizeof(srv_addr.sun_path) - 1);      unlink(UNIX_DOMAIN);            //bind sockfd and sockaddr      ret = bind(lsn_fd, (struct sockaddr*)&srv_addr, sizeof(srv_addr));      if(ret == -1)      {        perror("can't bind local sockaddr!");        close(lsn_fd);        unlink(UNIX_DOMAIN);        return 1;      }            //listen lsn_fd, try listen 1      ret = listen(lsn_fd, 1);      if(ret == -1)      {        perror("can't listen client connect request");        close(lsn_fd);        unlink(UNIX_DOMAIN);        return 1;      }            clt_len = sizeof(clt_addr);      while(1)      {        apt_fd = accept(lsn_fd, (struct sockaddr*)&clt_addr, &clt_len);        if(apt_fd < 0)        {          perror("can't listen client connect request");          close(lsn_fd);          unlink(UNIX_DOMAIN);          return 1;        }              printf("received a connection\n");        printf("send message to client\n");        memset(send_buf, 0, 1024);        strcpy(send_buf, "Hello, you have connected to server succeed");                int snd_num = write(apt_fd, send_buf, 1024);        if(snd_num != 1024)        {          perror("send messge to client failed\n");          close(apt_fd);          close(lsn_fd);          unlink(UNIX_DOMAIN);          return 1;        }        //read and printf client info        printf("============info=================\n");        for(i = 0; i < 4; i++)        {          memset(recv_buf, 0, 1024);          int rcv_num = read(apt_fd, recv_buf, sizeof(recv_buf));          printf("Message from client (%d) :%s\n", rcv_num, recv_buf);        }      }      close(apt_fd);      close(lsn_fd);      unlink(UNIX_DOMAIN);      return 0;    }

客户端：

    #include <stdio.h>    #include <stdlib.h>    #include <sys/socket.h>    #include <sys/un.h>    #include <unistd.h>    #define UNIX_DOMAIN "/tmp/UNIX.domain"    int main(void)    {      int connect_fd;      struct sockaddr_un srv_addr;      char snd_buf[1024];      char rcv_buf[1024];      int ret;      int i;            //create client socket      connect_fd = socket(PF_UNIX, SOCK_STREAM, 0);      if(connect_fd < 0)      {        perror("client create socket failed");        return 1;      }            //set server sockaddr_un      srv_addr.sun_family = AF_UNIX;      strcpy(srv_addr.sun_path, UNIX_DOMAIN);            //connect to server      ret = connect(connect_fd, (struct sockaddr*)&srv_addr, sizeof(srv_addr));      if(ret == -1)      {        perror("connect to server failed!");        close(connect_fd);        unlink(UNIX_DOMAIN);        return 1;      }            //receive message from server      memset(rcv_buf, 0, 1024);      int rcv_num = read(connect_fd, rcv_buf, sizeof(rcv_buf));      printf("receive message from server (%d) :%s\n", rcv_num, rcv_buf);      //printf("\n");            //send message to server      memset(snd_buf, 0, 1024);      strcpy(snd_buf, "message from client");      printf("sizeof(snd_buf): %d\n", sizeof(snd_buf));      sleep(2000);            //send message to server      for(i = 0; i < 4; i++)      {        write(connect_fd, snd_buf, sizeof(snd_buf));      }      close(connect_fd);      return 0;    }