服务端:
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
//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;
}
#include
#include
#include
#include
#include
#include
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;
}