socket并发服务器（frok）

//服务器 #include<stdio.h> #include<stdlib.h> #include<netinet/in.h>//套接字地址结构 #include<sys/socket.h>//socket函数 #include<strings.h>//字节操纵函数 bzero #include<string.h> #include<unistd.h> void str_echo(int sockfd) { char buffer[100]; int n; memset(buffer, 0, 100); while((n = read(sockfd, buffer, 100)) > 0) { buffer[n+1] = '\0'; printf("%s\n", buffer); write(sockfd, buffer, n); memset(buffer, 0, 100); } } int main() { int listenfd, connfd;//监听套接字、已连接的套接字 struct sockaddr_in server_sockaddr, client_sockaddr; socklen_t clientlen; pid_t childpid;//子进程号 if((listenfd = socket(AF_INET, SOCK_STREAM, 0)) == -1) { fprintf(stderr, "Socket failed\n"); exit(EXIT_FAILURE); } bzero(&server_sockaddr, sizeof(server_sockaddr)); server_sockaddr.sin_family = AF_INET; server_sockaddr.sin_port = htons(9877);//端口号，以网络字节序存储 server_sockaddr.sin_addr.s_addr = htonl(INADDR_ANY);//选择通配地址 if(bind(listenfd, (struct sockaddr*)&server_sockaddr, sizeof(server_sockaddr)) == -1)//绑定本地地址和端口号 { fprintf(stderr, "Bind failed\n"); exit(EXIT_FAILURE); } if(listen(listenfd, 5) == -1) { fprintf(stderr, "Listen faliled\n"); exit(EXIT_FAILURE); } for( ; ; ) { clientlen = sizeof(client_sockaddr); if((connfd = accept(listenfd, (struct sockaddr*)&client_sockaddr, &clientlen)) == -1) { fprintf(stderr, "Accept failed\n"); exit(EXIT_FAILURE); } if((childpid = fork()) == 0)//创建一个子进程处理客户端的连接 { close(listenfd);//关闭接听套接字 str_echo(connfd); close(connfd); exit(0);//子进程退出 } close(connfd); } } //客户端程序 #include<stdio.h> #include<stdlib.h> #include<unistd.h> #include<strings.h> #include<string.h> #include<netinet/in.h> #include<sys/socket.h> #include<arpa/inet.h>//地址转换函数 void str_cli(int sockfd) { char sendline[100], recvline[100]; int n; memset(sendline, 0, 100); memset(recvline, 0, 100); while(fgets(sendline, 100, stdin) != NULL) { write(sockfd, sendline , strlen(sendline)); memset(sendline, 0, 100); read(sockfd, recvline, 100); fputs(recvline, stdout); memset(recvline, 0, 100); } } int main(int argc, char **argv) { int sockfd; struct sockaddr_in server_sockaddr;//服务器参数 if((sockfd = socket(AF_INET, SOCK_STREAM, 0)) == -1) { fprintf(stderr, "Socket failed\n"); exit(EXIT_FAILURE); } bzero(&server_sockaddr, sizeof(server_sockaddr));//清零 server_sockaddr.sin_family = AF_INET; server_sockaddr.sin_port = htons(9877); if(inet_pton(AF_INET, argv[1], &server_sockaddr.sin_addr) == -1)//使用地址转换函数 { fprintf(stderr, "inet_pton failed\n"); exit(EXIT_FAILURE); } if(connect(sockfd, (struct sockaddr*)&server_sockaddr, sizeof(server_sockaddr)) == -1)//连接服务器 { fprintf(stderr, "Connect failed\n"); exit(EXIT_FAILURE); } str_cli(sockfd); exit(0); }