本文主要是介绍基于 TCP 协议的并发服务器程序，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！
服务端：
#include <stdio.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <errno.h>
#include <unistd.h>
#include <signal.h>
#include <sys/wait.h>
#include <netdb.h>
#include <pthread.h>//线程执行函数，负责读写
void *thr_fn ( void *arg )
{int size, j;char recv_buf[1024];int *parg = ( int * ) arg;int new_fd = *parg;while ( ( size = read ( new_fd, recv_buf, sizeof ( recv_buf ) ) ) > 0 ) {if ( recv_buf[0] == '@' ) {break;}printf ( "Message from client(%d): %s\n", size, recv_buf );for ( j = 0; j < size; ++j )recv_buf[j] = toupper(recv_buf[j]);write(new_fd,recv_buf,size);}close(new_fd);return 0;
}int main(int argc, char *argv[]){socklen_t clt_addr_len;int listen_fd;int com_fd;int ret;int i;static char recv_buf[1024];int len;int port;pthread_t tid;struct sockaddr_in clt_addr;struct sockaddr_in srv_addr;//服务器端运行时要给出端口信息，该端口为监听端口if(argc != 2){printf("Usage:%s port\n",argv[0]);return -1;}//获得输入的端口port = atoi(argv[1]);//创建套接字用于服务器的监听listen_fd = socket(PF_INET,SOCK_STREAM,0);if(listen_fd < 0){perror("cannot create listening socket");return -1;}//填充关于服务器的套接字信息memset(&srv_addr,0,sizeof(srv_addr));srv_addr.sin_family = AF_INET;srv_addr.sin_addr.s_addr = htonl(INADDR_ANY);srv_addr.sin_port = htons(port);//将服务器和套接字绑定ret = bind(listen_fd,(struct sockaddr *)&srv_addr,sizeof(srv_addr));if(ret == -1){perror("cannot bind server socket");close(listen_fd);return -1;}//监听指定端口ret = listen(listen_fd,5);if(ret == -1){perror("cannot listen the client connect request");close(listen_fd);return -1;}/*对每个连接来的客户端创建一个线程，单独与其进行通信，首先调用 read 函数读取客户端发送来的信息将其转化成大写后发送回客户端当输入"@"时，程序退出*/while(1){len = sizeof(clt_addr);com_fd = accept(listen_fd,(struct sockaddr *)&clt_addr,&len);if(com_fd < 0){if(errno == EINTR)continue;else{perror("cannot accept client connect request");close(listen_fd);return -1;}}printf("com_fd = %d\n",com_fd); //打印建立连接的客户端产生的套接字if((pthread_create(&tid,NULL,thr_fn,&com_fd)) == -1){perror("pthread_create error");close(listen_fd);close(com_fd);return -1;}}return 0;
}
客户端：
#include <stdio.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <netdb.h>
#include <unistd.h>int main(int argc, char**argv){int connect_fd;int ret;char snd_buf[1024];int i;int port;int len;static struct sockaddr_in srv_addr;//客户端运行需要给出具体的连接地址和端口if(argc != 3){printf("Usage: %s server_ip_address port\n",argv[0]);return -1;}//获得输入的端口port = atoi(argv[2]);//创建套接字用于客户端的连接connect_fd = socket(PF_INET,SOCK_STREAM,0);if(connect_fd < 0){perror("cannot create communication socket");return 1;}//填充关于服务器的套接字信息memset(&srv_addr,0,sizeof(srv_addr));srv_addr.sin_family = AF_INET;srv_addr.sin_addr.s_addr = inet_addr(argv[1]);srv_addr.sin_port = htons(port);//连接指定的服务器ret = connect(connect_fd,(struct sockaddr *)&srv_addr,sizeof(srv_addr));if(ret == -1){perror("cannot connect to the server");close(connect_fd);return -1;}memset(snd_buf,0,1024);/*用户输入信息后，程序将输入的信息通过套接字发送给服务器，然后调用read函数从服务器中读取发送来的信息当输入"@"时，程序退出*/while(1){write(STDOUT_FILENO,"input message:", 14);len = read(STDIN_FILENO,snd_buf,1024);if(len > 0)write(connect_fd,snd_buf,len);len = read(connect_fd,snd_buf,len);if(len > 0)printf("Message form server: %s\n",snd_buf);if(snd_buf[0] == '@')break;}close(connect_fd);return 0;
}
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