客户端

#include<stdio.h>
#include<stdlib.h>
#include<string.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netinet/ip.h>
#include <arpa/inet.h>
#include<unistd.h>
#include<errno.h>
#include<pthread.h>
 
#define BUFFSIZE 1024
#define ERRORCODE -1
 
static void *thread_send(void *arg)
{
	char buf[BUFFSIZE];
	int sd = *(int *) arg;
	while (1)
	{
		memset(buf, 0, sizeof(buf));
        //printf("客户端向服务器端发送内容：");
        
		read(STDIN_FILENO, buf, sizeof(buf));
		if (send(sd, buf, strlen(buf), 0) == -1)
		{
			printf("send error:%s 
", strerror(errno));
			break;
		}
	}
	return NULL;
}
static void *thread_recv(void *arg)
{
	char buf[BUFFSIZE];
	int sd = *(int *) arg;
	while (1)
	{
		memset(buf, 0, sizeof(buf));
		int rv = recv(sd, buf, sizeof(buf), 0);
		if (rv <= 0)
		{
			if(rv == 0) //server socket关闭情况
			{
				printf("server have already full !
");
				exit(0);//退出整个客服端
			}
		    printf("recv error:%s 
", strerror(errno));
		    break;
		}
		printf("
客户端受到来自服务器端发送的内容：
%s", buf);//输出接收到的内容
	}	
	return NULL;
}
int run_client(char *ip_str, int port)
{
	int client_sd;
	int con_rv;
	pthread_t thrd1, thrd2;
	struct sockaddr_in client_sockaddr; //定义IP地址结构
	client_sd = socket(AF_INET, SOCK_STREAM, 0);
	if (client_sd == -1)
	{
		printf("socket create error:%s 
", strerror(errno));
		return ERRORCODE;
	}
	memset(&client_sockaddr, 0, sizeof(client_sockaddr));
	client_sockaddr.sin_port = htons(port); //指定一个端口号并将hosts字节型传化成Inet型字节型（大端或或者小端问题）
	client_sockaddr.sin_family = AF_INET; //设置结构类型为TCP/IP
	client_sockaddr.sin_addr.s_addr = inet_addr(ip_str);//将字符串的ip地址转换成int型,客服端要连接的ip地址
	con_rv = connect(client_sd, (struct sockaddr*) &client_sockaddr,
	sizeof(client_sockaddr));
	//调用connect连接到指定的ip地址和端口号,建立连接后通过socket描述符通信
	if (con_rv == -1)
	{
		printf("connect error:%s 
", strerror(errno));
		return ERRORCODE;
	}
	if (pthread_create(&thrd1, NULL, thread_send, &client_sd) != 0)
	{
		printf("thread error:%s 
", strerror(errno));
		return ERRORCODE;
	}
	if (pthread_create(&thrd2, NULL, thread_recv, &client_sd) != 0)
	{
		printf("thread error:%s 
", strerror(errno));
		return ERRORCODE;
	}
	pthread_join(thrd2, NULL);// 等待线程退出
	pthread_join(thrd1, NULL);
	close(client_sd);
	return 0;
}
int main(int argc, char *argv[])
{
	if (argc < 3)
	{
		printf("Usage:ip port,example:127.0.0.1 8080 
");
		return ERRORCODE;
	}
	int port = atoi(argv[2]);
	char *ip_str = argv[1];
	run_client(ip_str,port);
	return 0;
}

服务器端

#include<stdio.h>
#include<stdlib.h>
#include<string.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netinet/ip.h>
#include <arpa/inet.h>
#include<unistd.h>
#include<errno.h>
#include<pthread.h>
 
#define BUFFSIZE 1024
#define ERRORCODE -1
 
static void *thread_send(void *arg)
{
	char buf[BUFFSIZE];
	int sd = *(int *) arg;
	while (1)
	{
		memset(buf, 0, sizeof(buf));
        //printf("客户端向服务器端发送内容：");
        
		read(STDIN_FILENO, buf, sizeof(buf));
		if (send(sd, buf, strlen(buf), 0) == -1)
		{
			printf("send error:%s 
", strerror(errno));
			break;
		}
	}
	return NULL;
}
static void *thread_recv(void *arg)
{
	char buf[BUFFSIZE];
	int sd = *(int *) arg;
	while (1)
	{
		memset(buf, 0, sizeof(buf));
		int rv = recv(sd, buf, sizeof(buf), 0);
		if (rv <= 0)
		{
			if(rv == 0) //server socket关闭情况
			{
				printf("server have already full !
");
				exit(0);//退出整个客服端
			}
		    printf("recv error:%s 
", strerror(errno));
		    break;
		}
		printf("
客户端受到来自服务器端发送的内容：
%s", buf);//输出接收到的内容
	}	
	return NULL;
}
int run_client(char *ip_str, int port)
{
	int client_sd;
	int con_rv;
	pthread_t thrd1, thrd2;
	struct sockaddr_in client_sockaddr; //定义IP地址结构
	client_sd = socket(AF_INET, SOCK_STREAM, 0);
	if (client_sd == -1)
	{
		printf("socket create error:%s 
", strerror(errno));
		return ERRORCODE;
	}
	memset(&client_sockaddr, 0, sizeof(client_sockaddr));
	client_sockaddr.sin_port = htons(port); //指定一个端口号并将hosts字节型传化成Inet型字节型（大端或或者小端问题）
	client_sockaddr.sin_family = AF_INET; //设置结构类型为TCP/IP
	client_sockaddr.sin_addr.s_addr = inet_addr(ip_str);//将字符串的ip地址转换成int型,客服端要连接的ip地址
	con_rv = connect(client_sd, (struct sockaddr*) &client_sockaddr,
	sizeof(client_sockaddr));
	//调用connect连接到指定的ip地址和端口号,建立连接后通过socket描述符通信
	if (con_rv == -1)
	{
		printf("connect error:%s 
", strerror(errno));
		return ERRORCODE;
	}
	if (pthread_create(&thrd1, NULL, thread_send, &client_sd) != 0)
	{
		printf("thread error:%s 
", strerror(errno));
		return ERRORCODE;
	}
	if (pthread_create(&thrd2, NULL, thread_recv, &client_sd) != 0)
	{
		printf("thread error:%s 
", strerror(errno));
		return ERRORCODE;
	}
	pthread_join(thrd2, NULL);// 等待线程退出
	pthread_join(thrd1, NULL);
	close(client_sd);
	return 0;
}
int main(int argc, char *argv[])
{
	if (argc < 3)
	{
		printf("Usage:ip port,example:127.0.0.1 8080 
");
		return ERRORCODE;
	}
	int port = atoi(argv[2]);
	char *ip_str = argv[1];
	run_client(ip_str,port);
	return 0;
}

运行结果