嵌入式C语言linux：服务器使用多线程为客户端提供服务，客户端发送任意一个正整数，服务器端返回此数因子的个数。

这个问题可以回答。以下是伪代码实现：

#include <stdio.h>

int count_factors(int num) {
    int count = 0;

    for (int i = 1; i <= num; i++) {
        if (num % i == 0) {
            count++;
        }
    }

    return count;
}

void *handle_client(void *arg) {
    int client_socket = *(int *) arg;

    while (1) {
        int num;

        if (recv(client_socket, &num, sizeof(num), 0) <= 0) {
            // Error or client closed connection
            close(client_socket);
            return NULL;
        }

        int count = count_factors(num);

        if (send(client_socket, &count, sizeof(count), 0) <= 0) {
            // Error or client closed connection
            close(client_socket);
            return NULL;
        }
    }
}

int main() {
    // Create server socket and bind to port
    // Listen for incoming connections

    while (1) {
        int client_socket = accept(listening_socket, NULL, NULL);

        if (client_socket < 0) {
            // Error accepting connection
            continue;
        }

        pthread_t thread_id;
        pthread_create(&thread_id, NULL, handle_client, &client_socket);
        pthread_detach(thread_id);
    }

    // Close listening socket

    return 0;
}