#include <stdio.h>#include <stdlib.h>#include <sys/types.h>#include <sys/socket.h>#include <netinet/in.h>#include <errno.h>#include <string.h>#define SRVIP "127.0.0.1"#define SRVPORT 10005#define MAX_NUM 80/*********************TCP socket通信服务器端流程如下：1.创建serverSocket2.初始化 serverAddr（服务器地址）3.将socket和serverAddr 绑定 bind4.开始监听 listen5.进入while循环，不断的accept接入的客户端socket，进行读写操作write和read6.关闭serverSocket**********************/int main(){    // 如果发生错误，函数返回值为-1。 否则，函数会返回一个代表新分配的描述符的整数    int serverSock = socket(AF_INET,SOCK_STREAM,IPPROTO_TCP);    if(serverSock < 0)    {        printf("socket creation failed\n");        exit(-1);    }    printf("socket create successfully.\n");    struct sockaddr_in serverAddr;    memset(&serverAddr,0,sizeof(serverAddr));    serverAddr.sin_family=AF_INET;    serverAddr.sin_port = htons((u_short)SRVPORT);    serverAddr.sin_addr.s_addr = inet_addr(SRVIP);    // bind() 将一个socket绑定到指定的IP和端口上，socket只接受绑定IP和端口的数据    if(bind(serverSock, (struct sockaddr*)&serverAddr, sizeof(struct sockaddr))==-1)    {        printf("Bind error.IP[%s], Port[%d]\n", SRVIP, serverAddr.sin_port);        exit(-1);    }    printf("Bind successful.IP[%s], Port[%d]\n", SRVIP, serverAddr.sin_port);    // 当socket和一个地址绑定之后，listen()函数会开始监听可能的连接请求    if(listen(serverSock,10)==-1)    {        printf("Listen error!\n");    }    printf("Listening on port[%d]\n", serverAddr.sin_port);    char recvBuf[MAX_NUM]={0};    char sendBuf[MAX_NUM]={0};    while(1)    {        struct sockaddr clientAddr;        int size = sizeof(clientAddr);        //阻塞，直到有新tcp客户端连接        int clientSock = accept(serverSock, &clientAddr, &size);        printf("***SYS***    New client touched.\n");        while(1)        {            //一直接收客户端socket的send操作            if(recv(clientSock, recvBuf, MAX_NUM, 0) == -1)            {                printf("read error.\n");            }            else            {                printf("receiv from client:%s\n",recvBuf);            }            if(strcmp(recvBuf,"Quit") == 0 || strcmp(recvBuf,"quit") == 0)            {                strcpy(sendBuf, "Goodbye,my dear client!");            }            else            {                strcpy(sendBuf, "Hello Client.");            }            // 向客户端发送套接字            if(send(clientSock, sendBuf , sizeof(sendBuf), MSG_NOSIGNAL) == -1)            {                printf("Send error!\n");            }            else            {                printf("Send to client:%s\n", sendBuf);            }            if(strcmp(recvBuf, "Quit") == 0 || strcmp(recvBuf, "quit") == 0)            {                break;            }            memset(recvBuf, 0, sizeof(recvBuf));            memset(sendBuf, 0, sizeof(sendBuf));        }        close(clientSock);    }    //关闭监听socket    close(serverSock);    return 0;}

#include <stdlib.h>#include <sys/types.h>#include <sys/socket.h> #include <netinet/in.h>#include <errno.h>#include <string.h>#include   <unistd.h>            #define CLTIP "127.0.0.1"#define SRVPORT 10005#define MAX_NUM 80    /**************************客户端流程：1.创建clientSocket2.初始化 serverAddr3.链接到服务器 connect4.利用send和recv进行读写操作5.关闭clientSocket**************************/int main(){    // 延迟1s    //sleep(1000);    // socket() 为通讯创建一个端点，为套接字返回一个文件描述符    int clientsock = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);    if(clientsock < 0)    {        printf("socket creation failed\n");        exit(-1);    }    printf("socket create successfully.\n");    struct sockaddr_in clientAddr;    clientAddr.sin_family = AF_INET;    clientAddr.sin_port = htons((u_short)SRVPORT);    clientAddr.sin_addr.s_addr = inet_addr(CLTIP);    if(connect(clientsock, (struct sockaddr*)&clientAddr, sizeof(struct sockaddr)) < 0)    {        printf("Connect error.IP[%s], port[%d]\n", CLTIP, clientAddr.sin_port);        exit(-1);    }    printf("Connect to IP[%s], port[%d]\n", CLTIP, clientAddr.sin_port);    char sendBuf[MAX_NUM]={0};    char recvBuf[MAX_NUM]={0};    while(gets(sendBuf) != ‘\0‘)    {        if(send(clientsock, sendBuf, strlen(sendBuf) + sizeof(char), 0) == -1)        {            printf("send error!\n");        }        printf("send to server:%s\n", sendBuf);        memset(sendBuf, 0, sizeof(sendBuf));        if(recv(clientsock, recvBuf, MAX_NUM, 0) == -1)        {            printf("rev error!\n");        }        printf("receive from server:%s\n",recvBuf);        if(strcmp(recvBuf,"Goodbye,my dear client!")==0)        {            break;        }        memset(recvBuf, 0, sizeof(recvBuf));    }    close(clientsock);    return 0;}

server_tcp:server_tcp.o        gcc -o server_tcp server_tcp.oserver_tcp.o:server_tcp.c        gcc -c server_tcp.cclean:        rm -rf  server_tcp server_tcp.o

client_tcp:client_tcp.o        gcc client_tcp.o -o client_tcpclient_tcp.o:client_tcp.c        gcc -c client_tcp.cclean:        rm -rf client_tcp client_tcp.o