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#include <stdio.h> #include <stdlib.h> #include <string.h> #include <unistd.h> #include <sys/socket.h> #include <netinet/in.h> #include <arpa/inet.h> #define MAXLINE 1000 #define SERV_PORT 9931 void
doprocessing(int
sock, struct
sockaddr_in cliaddr) { int
n; char
str[INET_ADDRSTRLEN]; char
*buf = (char
*)malloc(MAXLINE); char
*reply = (char
*)malloc(MAXLINE*2); memset(buf, ‘\0‘, MAXLINE); while
(1) { n = read(sock, buf, MAXLINE); strcpy(reply,"I got your message: "); if
(n < 0) { perror("Error reading from socket!"); return; } else
{ printf("Connect from %s:%d\n", inet_ntop(AF_INET, &cliaddr.sin_addr, str, sizeof(str)), ntohs(cliaddr.sin_port)); strcat(reply,buf); printf("receive %s\n",buf); write(sock, reply, MAXLINE); } memset(buf,0,sizeof(char)*MAXLINE); memset(reply,0,sizeof(char)*MAXLINE); } free(reply); free(buf); } int
main(void) { struct
sockaddr_in servaddr, cliaddr; int
listenfd, connfd, pid; socklen_t cliaddr_len = sizeof(cliaddr); listenfd = socket(AF_INET, SOCK_STREAM, 0); if
(listenfd < 0) { perror("Error opening socket!"); exit(-1); } memset(&servaddr, 0, sizeof(struct
sockaddr_in)); servaddr.sin_family = AF_INET; servaddr.sin_addr.s_addr = inet_addr("10.13.81.182"); servaddr.sin_port = htons(SERV_PORT); bind(listenfd, (struct
sockaddr *)&servaddr, sizeof(servaddr)); listen(listenfd, 2000); printf("server服务器开始等待客户端连接 ...\n"); while
(1) { connfd = accept(listenfd, (struct
sockaddr *)&cliaddr, &cliaddr_len); pid = fork(); if
(pid == -1) { perror("call to fork"); exit(-1); } else
if (pid == 0) { close(listenfd); doprocessing(connfd, cliaddr); exit(0); } else
{ close(connfd); } } return
0; } |
再写一个客户端通过socket通信向服务器发送数据的代码：cli.c
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#include <stdio.h> #include <stdlib.h> #include <string.h> #include <unistd.h> #include <sys/socket.h> #include <netinet/in.h> #include <arpa/inet.h> #define MAXLINE 1000 #define SERV_PORT 9931 int
main(int
argc, char
*argv[]) { struct
sockaddr_in servaddr; char
*buf = (char
*)malloc(MAXLINE); char
*rec = (char
*)malloc(MAXLINE); int
servfd, n; servfd = socket(AF_INET, SOCK_STREAM, 0); memset(&servaddr, 0, sizeof(servaddr)); servaddr.sin_family = AF_INET; servaddr.sin_addr.s_addr = inet_addr("10.13.81.182"); servaddr.sin_port = htons(SERV_PORT); connect(servfd, (struct
sockaddr *)&servaddr, sizeof(servaddr)); while
(fgets(buf, MAXLINE, stdin)!= NULL) { write(servfd, buf, strlen(buf)); n = read(servfd, rec, MAXLINE); if
(n == 0) { perror("The other side has been closed."); exit(-1); } else
{ printf("从服务器返回的信息为:%s\n", rec); } memset(rec,0,sizeof(char)*MAXLINE); memset(buf,0,sizeof(char)*MAXLINE); } close(servfd); return
0; } |
关于TCP连接的稍后补上
C语言socket编程——linux环境,布布扣,bubuko.com
原文地址：http://www.cnblogs.com/corolla/p/3757968.html
