程序没有进入主函数？

Question

我正在创建服务器客户端连接，但出于某种原因，当我运行服务器代码时，它只会给我提示，没有任何反应。我把printf作为main函数中的第一件事，但即使这样也不会发生。什么可以在主要之前执行？我认为我没有任何可能导致问题的事情。

#include "md5.h"
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <errno.h>
#include <string.h>
#include <sys/types.h>
#include <pthread.h>

void *handle_connection (void *);                               //gets a connection identifier and handles that incoming connection
int verify_password (char s[]);                                 // verifies if the input password is correct

int main(int argc, char *argv[])
{
    pthread_t connected;
    pthread_attr_t attributes;
    int listenfd = 0, conn_id = 0;                          // the listening socket identifier and current connection identifier
        //A: Creates the master socket 
    listenfd = socket (PF_INET, SOCK_STREAM, 0);   
    //B: the struct variable that keeps the socket address
    struct sockaddr_in sad;                                 /* structure to hold an IP address */ 
    struct sockaddr_in cad;
    struct hostent *ptrh;                                   /* pointer to a host table entry */ 
    socklen_t alen;
    //B: initialization of socket address variable
    memset ((char *)&sad, 0, sizeof(sad));                  /* clear sockaddr structure */ 
    sad.sin_family = AF_INET;                               /* set family to Internet */ 
    sad.sin_addr.s_addr = INADDR_ANY;                       /* set the local IP address */ 
    sad.sin_port = htons((u_short) 5000);                   /* set the port number */ 
    //C: binds the socket to its address
    bind (listenfd, (struct sockaddr *)&sad, sizeof(sad));
        //D: starts listening on that socket
    listen (listenfd, 100000);

        while (1)                                               // listens for incoming connections until program exits manually
        {
        int conn_id = 0;        
        //E: Wait for a connection request and accept it
        conn_id = accept (listenfd, (struct sockaddr *)&cad, &alen);
        //F: if the connection has been established it creates a thread that handles the connection       
        if (conn_id != -1)
        {
            pthread_attr_init (&attributes);
            pthread_attr_setdetachstate (&attributes, PTHREAD_CREATE_DETACHED);

            pthread_create (&connected, &attributes, (void *) handle_connection, &conn_id); 
        } 
        }
}

void *handle_connection(void *arg)
{
    int conn_id = *(int *) arg;
    char recv_buff[1024];                                   // the buffer that is used for keeping the data read from the socket
    int n = 0;                                              // number of characters read from socket
    //G: read from connection into the buffer and checks if recieving data was successful
    if (n = recv (conn_id, recv_buff, 1024, 0) <= 0)
    {
        printf ("Error Reading");
    }
    //H: verifies if the password is correct and sends T if the password is correct and F otherwise 
    if (verify_password (recv_buff) == 1)
    {
        if (send (conn_id, "T", 1, 0) < 1) {
            printf ("Error Sending");
        }
    } else {
        if (send (conn_id, "F", 1, 0) < 1) {
            printf ("Error Sending");
        }
    }
        //I: closes the connection
    close (conn_id);    
}

int verify_password(char s[])
{
    char md5_hashed_password[33] ="24af484e92082ad450a63a69f924f10a"; // The password of server hashed by MD5
    char md5_hashed_text[33];                                         // Keeps the MD5 hashed text of input text
    size_t len = strlen(s);
    md5 ((uint8_t*)s, len, md5_hashed_text);                          //Finds the MD5 hashed of input text
    if (strncmp (md5_hashed_text, md5_hashed_password, 32) == 0)            //If the hashed value of the input value and the 
        return 1;                             // password is same the password is accepted
    return 0;
}