Tcp客户端和服务器帮助Unix

Question

我对此任务感到困惑。我需要实现一个C ++程序，该程序在循环中侦听端口以接收来自客户端的TCP请求。对于每个接受的传入请求，它会派一个孩子来读取和处理该请求。父进程继续以无限循环的方式侦听并接受传入的TCP请求。

程序接受2个命令行参数：

要监听的端口号，目录的路径名，该目录用作所有请求的文件或目录的根。您能帮我吗？

/*
 * TCPClient.cxx
 * 
 * TCP client
 * 
 *  sends message to TCP server
 *  waits for message received from server 
 *        
 *  command line arguments:
 *      argv[1] FQDN of server
 *      argv[2] port number to send to
 *      argv[3] request to send
 *  
 */
#include <sys/socket.h>
#include <netdb.h>
#include <unistd.h>
#include <cstdlib>
#include <cstring>
#include <cstdio>
#include <iostream>
using namespace std;

int main(int argc, char *argv[]) {
    if (argc != 4) {
        cerr << "USAGE: TCPClient server_name port request\n";
        exit(EXIT_FAILURE);
    }   
    // lookup FQDN
    struct addrinfo *res, hints;

    memset(&hints, 0, sizeof(hints));
    hints.ai_family = AF_INET;
    hints.ai_socktype = SOCK_STREAM;

    int error = getaddrinfo(argv[1], argv[2], &hints, &res);
    if (error) {
        cerr << argv[1] << ": " << gai_strerror(error) << endl;
        exit(EXIT_FAILURE);
    }       
    char buffer[1024];
    int sent, received;

    // Create the TCP socket
    int sock = socket(AF_INET, SOCK_STREAM, 0);
    if (sock < 0) {
        perror("Failed to create socket");
        exit(EXIT_FAILURE);
    }   

    // connect to server
    if (connect(sock, res->ai_addr, res->ai_addrlen) < 0) {
        perror("connect");
        exit(EXIT_FAILURE);
    }

    // Send the message string to the server 
    sent = write(sock, argv[3], strlen(argv[3])+1);
    if (sent < 0) {
        perror("write");
        exit(EXIT_FAILURE);
    }

    // Receive the message back from the server 
    do {
        received = read(sock, buffer, sizeof(buffer));
        if (received < 0) {
            perror("read");
            exit(EXIT_FAILURE);
        }
        cout.write(buffer, received);
    } while (received > 0);
    cout << endl;   

    close(sock);
}

Answer 1

[创建套接字时，我看不到您打电话给bind(),listen()以等待客户端连接，请给我更多信息。