linux上客户端绑定固定端口请求server

linux上客户端绑定固定端口请求server， 这样可以用客户端的固定端口去请求不同的server

#include <iostream>#include <sys/select.h>#include <sys/socket.h>#include <unistd.h>#include <pthread.h>#include <stdio.h>#include <stdlib.h>#include <sys/types.h>#include <netinet/in.h>#include <arpa/inet.h>#include <string>#include <string.h>#include <event.h>using namespace std;#define BUF_SIZE 1024#define LOCAL_PORT 9092#define FAULT_SERVER_PORT 9091/** * 客户端绑定固定端口 去 连接到server端 */int connectServer(char* ip, int port) {    int flags = 1;    int fd = socket(AF_INET, SOCK_STREAM, 0);    setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, (void *) &flags, sizeof(flags));    /* 客户端绑定固定端口*/    sockaddr_in localAddr;    bzero(&localAddr, sizeof(localAddr));    localAddr.sin_family = AF_INET;    localAddr.sin_addr.s_addr = htonl(INADDR_ANY);    localAddr.sin_port = htons(LOCAL_PORT);    bind(fd, (const sockaddr*) &localAddr, sizeof(localAddr));    if (-1 == fd) {        cout << "Error, connectServer() quit" << endl;        return -1;    }    struct sockaddr_in remote_addr; //服务器端网络地址结构体    memset(&remote_addr, 0, sizeof(remote_addr)); //数据初始化--清零    remote_addr.sin_family = AF_INET; //设置为IP通信    remote_addr.sin_addr.s_addr = inet_addr(ip); //服务器IP地址    remote_addr.sin_port = htons(port); //服务器端口号    int con_result = connect(fd, (struct sockaddr*) &remote_addr,                             sizeof(struct sockaddr));    if (con_result < 0) {        cout << "Connect Error!" << endl;        close(fd);        return -1;    }    return fd;}void on_read(int sock, short event, void* arg) {    char* buffer = new char[BUF_SIZE];    memset(buffer, 0, sizeof(char) * BUF_SIZE);    //--本来应该用while一直循环，但由于用了libevent，只在可以读的时候才触发on_read(),故不必用while了    int size = read(sock, buffer, BUF_SIZE);    if (0 == size) { //说明socket关闭        cout << "read size is 0 for socket:" << sock << endl;        return;    }    cout << "Received from server---" << buffer << endl;    delete[] buffer;}void* init_read_event(void* arg) {    long long_sock = (long) arg;    int sock = (int) long_sock;    //-----初始化libevent，设置回调函数on_read()------------    struct event_base* base = event_base_new();    struct event* read_ev = (struct event*) malloc(sizeof(struct event)); //发生读事件后，从socket中取出数据    event_set(read_ev, sock, EV_READ | EV_PERSIST, on_read, NULL);    event_base_set(base, read_ev);    event_add(read_ev, NULL);    event_base_dispatch(base);    //--------------    event_del(read_ev);    free(read_ev);    event_base_free(base);}/*** 创建一个新线程，在新线程里初始化libevent读事件的相关设置，并开启event_base_dispatch*/void init_read_event_thread(int sock) {    pthread_t thread;    pthread_create(&thread, NULL, init_read_event, (void*) sock);    pthread_detach(thread);}int main() {    cout << "main started" << endl; // prints Hello World!!!    cout << "Please input server IP:" << endl;    char ip[16];    cin >> ip;    cout << "Please input port:" << endl;    int port;    cin >> port;    cout << "ServerIP is " << ip << " ,port=" << port << endl;    int socket_fd = connectServer(ip, port);    cout << "socket_fd=" << socket_fd << endl;    init_read_event_thread(socket_fd);    //--------------------------    char buffer[BUF_SIZE];    bool isBreak = false;    while (!isBreak) {        cout << "Input your data to server(\'q\' or \"quit\" to exit)" << endl;        cin >> buffer;        if (strcmp("q", buffer) == 0 || strcmp("quit", buffer) == 0) {            isBreak = true;            close(socket_fd);            break;        }        cout << "Your input is " << buffer << endl;        int write_num = write(socket_fd, buffer, strlen(buffer));        cout << write_num << " characters written" << endl;        sleep(1);    }    return 0;}