socket用法之-简单的server

[test@localhost ~/src/short-url]# cat select.cpp
#include <sys/types.h>
#include <sys/socket.h>
#include <string.h>
#include <errno.h>
#include <stdlib.h>
#include <arpa/inet.h>
#include <netinet/in.h>
#include <stdio.h>


#include <iostream>


/*
 * support http find/insert/delete short url
 * find: client send http request like curl -I t.cn/111
 * */
int main(int argc, char **argv)
{
    //1. listen socket
    int listen_fd;
    listen_fd = socket(AF_INET, SOCK_STREAM, 0);
    if (listen_fd < 0)
    {
        std::cout<<"socket create failed:"<<strerror(errno)<<std::endl;
        exit(1);
    }
    int option_value=1;
    if (setsockopt(listen_fd, SOL_SOCKET, SO_REUSEADDR, &option_value, sizeof(option_value)) < 0)
    {
        std::cout<<"socket setsockopt failed:"<<strerror(errno)<<std::endl;
        exit(1);
    }

    //2. process request

    struct sockaddr_in server_addr, client_addr;
    bzero(&server_addr, sizeof(server_addr));
    server_addr.sin_family = AF_INET;
    server_addr.sin_port = htons(9876);
    server_addr.sin_addr.s_addr = INADDR_ANY;

    if (bind(listen_fd, (struct sockaddr *)&server_addr, sizeof(server_addr)) < 0)
    {
        std::cout<<"socket bind failed:"<<strerror(errno)<<std::endl;
        exit(1);
    }

    if (listen(listen_fd, 128) < 0)
    {
        std::cout<<"socket listen failed:"<<strerror(errno)<<std::endl;
        exit(1);
    }

    char buffer[256];
    int client_fd;
    int len;
    socklen_t clilen;
    clilen = sizeof(client_addr);
    while (1)
    {
        bzero(buffer, sizeof(buffer));
        if ((client_fd = accept(listen_fd, (struct sockaddr *)&client_addr, &clilen)) < 0)
        {
            std::cout<<"socket accept failed:"<<strerror(errno)<<std::endl;
            exit(1);
        }

        if ((len = read(client_fd, buffer, sizeof(buffer))) < 0)
        {
            std::cout<<"socket read failed:"<<strerror(errno)<<std::endl;
            exit(1);
        }
        std::cout<<"ip:"<<inet_ntoa(client_addr.sin_addr)<<" port:"<<client_addr.sin_port<<" msg:"<<buffer<<std::endl;

        bzero(buffer, sizeof(buffer));
        snprintf(buffer, sizeof(buffer), "At %d I got you message!", time(NULL));
        if ((len = write(client_fd, buffer, strlen(buffer))) < 0)
        {
            std::cout<<"socket write failed:"<<strerror(errno)<<std::endl;
            exit(1);
        }
        close(client_fd);
    }

    return 0;
}