tcp_multi_thread_server.cpp

#include <iostream>
#include <thread>
#include <cstring>
#include <unistd.h>
#include <arpa/inet.h>

void handle_client(int new_socket) {
    char buffer[1024] = {0};
    const char *hello = "Hello from server";

    read(new_socket, buffer, 1024);
    std::cout << "Message received: " << buffer << std::endl;
    send(new_socket, hello, strlen(hello), 0);
    std::cout << "Hello message sent" << std::endl;
    close(new_socket);
}

int main() {
    int server_fd;
    struct sockaddr_in address;
    int addrlen = sizeof(address);

    if ((server_fd = socket(AF_INET, SOCK_STREAM, 0)) == 0) {
        std::cerr << "Socket failed" << std::endl;
        exit(EXIT_FAILURE);
    }

    address.sin_family = AF_INET;
    address.sin_addr.s_addr = INADDR_ANY;
    address.sin_port = htons(8005);

    if (bind(server_fd, (struct sockaddr *)&address, sizeof(address)) < 0) {
        std::cerr << "Bind failed" << std::endl;
        exit(EXIT_FAILURE);
    }

    if (listen(server_fd, 3) < 0) {
        std::cerr << "Listen failed" << std::endl;
        exit(EXIT_FAILURE);
    }

    while (true) {
        int new_socket;
        if ((new_socket = accept(server_fd, (struct sockaddr *)&address, (socklen_t*)&addrlen)) < 0) {
            std::cerr << "Accept failed" << std::endl;
            exit(EXIT_FAILURE);
        }
        std::thread t(handle_client, new_socket);
        t.detach();
    }

    close(server_fd);
    return 0;
}