linux socket网络编程实例

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在工作中，用到各种框架，基本都是将底层的通讯给封装好了，于是想自己动动手，光看看老是忘记。一下例子为使用socket tcp实现的一个简单的例子，即是一个echo模型的简单聊天室服务，服务端启动后，等待客户端连接，如果客户端连接进来，则创建一个子进程来处理客户端的io。注意：本例子单纯的使用tcp长连接，当连接数量大时，服务器会宕机，这个时候应使用更高效的epoll来实现。直接上代码如下：

本例子只有2个文件socketserver.cpp 和socketclient.cpp，sockt相关的一些函数可以参考其它博文，这里暂不赘述。

socket..cpp文件：

#include <stdio.h>#include <unistd.h>#include <sys/socket.h>#include <errno.h>#include <string.h>#include <sys/types.h>#include <netinet/in.h>#define PORT 8010int main (int argc, char **argv){int server_fd, connect_fd;sockaddr_in serveraddr;server_fd = socket(AF_INET, SOCK_STREAM, 0);if(server_fd == -1){printf("create socket err:%s,errno:%d\n",strerror(errno),errno);return 1;}memset(&serveraddr, 0, sizeof(serveraddr));serveraddr.sin_family = AF_INET;serveraddr.sin_addr.s_addr = htonl(INADDR_ANY);serveraddr.sin_port = htons(PORT);int result = bind(server_fd, (struct sockaddr*) &serveraddr, sizeof(serveraddr));if(result == -1){printf("bind socket err:%s,errno:%d\n",strerror(errno),errno);return 1;}result = listen(server_fd, 10);if(result == -1){printf("listen socket err:%s,errno:%d\n",strerror(errno),errno);return 1;}while(true){printf("==server is ok, ready for accept:\n");connect_fd = accept(server_fd, (struct sockaddr*) NULL,NULL);if(connect_fd == -1){printf("connect err:%s,errno:%d",strerror(errno),errno);continue;}printf("==accept fd:%d\n",connect_fd);int pid = fork();if(pid == 0){char buff[4096] = "";while(true){int recvlen  = recv(connect_fd, buff, sizeof(buff), 0);if(recvlen == 0 || strcmp(buff,"quit") == 0){break;}buff[recvlen] = '\0';printf("==recv msg from client msg:%s,fd:%d\n", buff,connect_fd);int sendresult = send(connect_fd, buff, strlen(buff), 0);if(sendresult == -1){break;}}close(connect_fd);}close(connect_fd);}close(server_fd);return 0;}

编译：g++ -o server.out socktserver.cpp

socketclient.cpp文件:

#include <stdio.h>#include <unistd.h>#include <sys/socket.h>#include <errno.h>#include <string.h>#include <sys/types.h>#include <iostream>#include <arpa/inet.h>#define STRIP "127.0.0.1"#define PORT 8010int main(int argc, char **argv){int socketfd;sockaddr_in serveraddr;socketfd = socket(AF_INET, SOCK_STREAM, 0);if(socketfd < 0){printf("create socket err:%s,errno:%d\n",strerror(errno),errno);return 1;}memset(&serveraddr, 0, sizeof(serveraddr));serveraddr.sin_family = AF_INET;serveraddr.sin_port = htons(PORT);if(inet_pton(AF_INET, STRIP, &serveraddr.sin_addr) <= 0){printf("inet_pton err:%s,errno:%d\n",strerror(errno),errno);return 1;}int result = connect(socketfd,(struct sockaddr*) &serveraddr, sizeof(serveraddr));if(result< 0){printf("connect socket err:%s,errno:%d\n",strerror(errno),errno);return 1;}char buff[1024];char recvbuff[1024];while(std::cin >> buff){printf("==send msg to server:%s\n",buff);result = send(socketfd, buff,sizeof(buff),0);if(result <= 0){printf("send msg:%s err:%s,errno:%d",buff,strerror(errno),errno);break;}int recvlen = recv(socketfd, recvbuff, sizeof(recvbuff), 0);if(recvlen <= 0){printf("recv err:%s,errno:%d",strerror(errno),errno);break;}recvbuff[recvlen] = '\0';printf("==recv msg from server:%s\n",recvbuff);}close(socketfd);return 0;}

编译：g++ -o client.out socketclient.cpp

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