tcp_udp.rar_LINUX TCP _Linux/Unix编程_TCP UDP Linux_tcp udp 互联网

#include <sys/types.h> /* See NOTES */ #include <sys/socket.h> #include <string.h> #include <sys/socket.h> #include <netinet/in.h> #include <arpa/inet.h> #include <unistd.h> #include <stdio.h> #include <signal.h> #define SERVER_PORT 8888 #define BACKLOG 10 //struct sockaddr_in{ // unsigned short sin_family; // unsigned short int sin_port; // struct in_addr sin_addr; // unsigned char sin_zero[8]; //}; int main(int argc, char **argv) { int iSocketServerFd; int iSocketClientFd; struct sockaddr_in tSocketServerAddr; struct sockaddr_in tSocketClientAddr; int iAddrLen; int iClientNum = -1; unsigned char ucRecvBuf[1000]; int iRecvLen; tSocketServerAddr.sin_family=AF_INET; tSocketServerAddr.sin_addr.s_addr=htonl(INADDR_ANY); tSocketServerAddr.sin_port=htons(SERVER_PORT); memset(tSocketServerAddr.sin_zero, 0, 8); //bzero(&tSocketServerAddr,sizeof(struct sockaddr_in));放前面时全部清零 signal(SIGCHLD,SIG_IGN); //防止壃死进程 if ((iSocketServerFd = socket(AF_INET,SOCK_STREAM,0)) == -1) { printf("get socket failed \n"); return -1; } if (bind(iSocketServerFd,(const struct sockaddr *)(&tSocketServerAddr),sizeof(struct sockaddr))==-1) { printf("bind error!\n"); return -1; } if (listen(iSocketServerFd, BACKLOG)==-1) { printf("listen error!\n"); return -1; } while (1) { iAddrLen = sizeof(struct sockaddr); if ((iSocketClientFd = accept(iSocketServerFd, (struct sockaddr *)(&tSocketClientAddr), &iAddrLen)) == -1) { printf("accept error!\n"); return -1; } else { iClientNum++; printf("Get connected from client %d: %s\n", iClientNum, inet_ntoa(tSocketClientAddr.sin_addr)); //fork（）函数通过系统调用创建一个与原来进程几乎完全相同的子进程，创建成功返回0,失败返回<0,即fork()==0为子进程代码 //fork()>0为原父进程代码 if (!fork()) { /* 子进程的源码 */ while (1) { iRecvLen = recv(iSocketClientFd, ucRecvBuf, 999, 0); if (iRecvLen <= 0) { close(iSocketClientFd); return -1; } else { ucRecvBuf[iRecvLen] = '\0'; printf("Get Msg From Client %d: %s\n", iClientNum, ucRecvBuf); } } } } } return 0; }