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;
}