SOCKET是进程间通信的一种方式,这个时候socket的创建、绑定、连接时的参数是与网络上不同主机间的通信不同的,比如对于socketaddr的使用,进程间通信使用的是sockaddr_un。而主机间的通信使用的是sockadd_in。
现贴出简单的未使用线程的进程间通信代码:
server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;
- }
client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;
- }
批注:如果想要实现多个客户端的登录,可以书写一个shell脚本,进行批处理连接。
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