网络编程

网络通讯三要素：源 目的 长度

数据传输： TCP 可靠 重传 UDP 不可靠 (视频通话)

相关函数

socket()  bind() listen()  accept ()  connect() send() recv()

server.c //可接受多个客户端请求（fork）

#include <sys/types.h>
#incldue <sys/socket.h>
#incldue <string.h>
#include <netinet/in.h>
#incldue <arpa/inet.h>


#define SERVER_PORT 8888
#define BACKLOG  10


int main()
{
    int iSocketServer;
    struct sockaddr_in tSocketServerAddr;
    struct sockaddr_in tSocketClieAddr;
    int iSocketClient;
    int iRet;
    int iAddrLen; 
    

    iSocketServer = socket(AP_INET, SOCK_STREAM, 0);
    if (-1 == iSocketServer )
    {
        printf("socket error!\n");
        return -1;
    }

     tSocketServerAddr.sin_family = AF_INET;
     tSocketServerAddr.sin_port    = htons(SERVER_PORT);  // host to net , short
     tSocketServerAddr.sin_addr.s_addr  =  INADDR_ANY
     memset(tSocketServerAddr.sin_zero, 0,8);

     iRet = bind(iSocketServer, (const struct sockaddr *)&tSocketServerAddr, sizeof(struct sockaddr));
     if ( -1 ==iRet)
     {
        printf("bind error!\n");
        return -1;
     }    

    iRet = listen(iSocketServer, BACKLOG);
    if (-1 == iRet)
    {
        printf("listen error!\n");
        return -1;
    }

    
    while (1)
    { 
           iAddrLen = sizeof(struct sockaddr);
           iSocketClient = accept(  iSocketServer, (struct sockaddr *)&tSocketClieAddr);
            if (-1 != iSocketClient)
            {
                priintf("Get connet from %s\n", inet_ntoa())
            }   
    }



    return 0;
}