简单socket示例

来源：互联网发布：windows 下载编辑：程序博客网时间：2024/04/29 23:15

最近在看redis的事件驱动相关的源码，使用epoll来做IO事件的注册和触发，所以先重新学习整理下socket编程。

打算总共写三篇文章

简单socket示例
epoll socket
redis的事件驱动

在实现之前先整理下接下来会用到的socket的接口 通过man查看各个接口的功能和参数

    int socket(int domain, int type, int protocol);    int bind(int socket, const struct sockaddr *address, socklen_t address_len);    int listen(int socket, int backlog);    int accept(int socket, struct sockaddr *restrict address, socklen_t *restrict address_len);    int connect(int socket, const struct sockaddr *address, socklen_t address_len);    ssize_t send(int socket, const void *buffer, size_t length, int flags);    ssize_t recv(int socket, void *buffer, size_t length, int flags);    int close(int fildes);

接下来做一个最简单的1对1的server和client的socket通信的模型示例

server 启动等待连接

client发起连接，

serverd端响应并发送消息，

client端接受并显示

//server #include <stdio.h>#include <sys/socket.h>#include <netinet/in.h>#include <string.h>#include <stdlib.h>#include <errno.h>int main(){    int socket_fd = 0;    //create socket    if((socket_fd = socket(AF_INET, SOCK_STREAM, 0)) < 0) {        printf("create socket failed %s:%d\n", strerror(errno), errno);        exit(1);    }    //init sockaddr    struct sockaddr_in server_addr;    server_addr.sin_family = AF_INET;    server_addr.sin_port = htons(2323);    server_addr.sin_addr.s_addr = inet_addr("127.0.0.1");    //bind    if(bind(socket_fd, &server_addr, sizeof(server_addr)) < 0) {        printf("bind failed %s:%d\n", strerror(errno), errno);        exit(1);    }    //listen    if(listen(socket_fd, 10) < 0) {        printf("listen failed %s:%d\n", strerror(errno), errno);        exit(1);    }    printf("The server is now ready to accept connections\n");    for(;;)    {        struct sockaddr_in client_addr;        int client_size = sizeof(client_addr);        //accpet        int client_fd = accept(socket_fd, &client_addr, &client_size);        printf("new client accept %d\n", client_fd);        //send msg        char *msg = "connect success\n";        send(client_fd, msg, strlen(msg) + sizeof(char), 0);        close(client_fd);    }}

//client#include <stdio.h>#include <sys/socket.h>#include <netinet/in.h>#include <string.h>#include <stdlib.h>#include <errno.h>int main(){    int socket_fd = 0;    //create socket    if((socket_fd = socket(AF_INET, SOCK_STREAM, 0)) < 0) {        printf("create socket failed %s:%d\n", strerror(errno), errno);        exit(1);    }    //init sockaddr    struct sockaddr_in server_addr;    server_addr.sin_family = AF_INET;    server_addr.sin_port = htons(2323);    server_addr.sin_addr.s_addr = inet_addr("127.0.0.1");    if(connect(socket_fd, &server_addr, sizeof(server_addr)) < 0){        printf("connect failed %s:%d\n", strerror(errno), errno);        exit(1);    }    char recv_buf[100];    int left_len = 0;    recv(socket_fd, recv_buf, 100, 0);    printf("%s\n", recv_buf);}

0 0