客户端连接无法建立

Question

我的客户有问题。我使用线程与服务器建立多个连接。客户端应连接到服务器并相互通信。问题是他们无法连接到服务器。

这是我的代码：

client.c

#include <stdio.h>
#include <stdlib.h>
#include <sys/socket.h>
#include <netdb.h>
#include <netinet/in.h>
#include <string.h>
#include <fcntl.h>
#include <unistd.h> 
#include<pthread.h>

typedef struct{
 int portno;
 int sockfd;
 const char *ip;
 const char *username;

 }clients;

clients client;

int server_connect()
{
  int sock;
  struct sockaddr_in server;

  sock = socket(AF_INET, SOCK_STREAM, 0);
  if (sock == -1)
    {
      errx(1, "Could not create socket");
      exit(EXIT_FAILURE);
    }

  memset(&server, 0, sizeof server);

  server.sin_addr.s_addr = inet_addr(client.ip);
  server.sin_family      = AF_INET;
  server.sin_port        = htons(client.portno);

  if (connect(sock, (struct sockaddr *) &server, sizeof(server)) < 0)
    {
        errx(1, "Connect failed. Error");
        exit(EXIT_FAILURE);
    }

  fprintf(stdout, "Connected to server\n");

  client.sockfd = sock;

  pthread_t send_thread, receive_thread;

  if (pthread_create(&send_thread, NULL, send_message, (void *) &client.sockfd) < 0)
    errx (1, "can not create send thread");

  if (pthread_create(&receive_thread, NULL, receive_message, (void *) &client.sockfd) < 0)
    errx (1, "can not create receive thread");

  pthread_join(send_thread, NULL);
  pthread_join(receive_thread, NULL);

  close(sock);

  return 0;
}

send_message（）和receive_message（）

void *send_message()
{
   char buffer[256], log[256];

   snprintf(log, sizeof log, "user %s is joined.", client.username);
   if (send(client.sockfd, log, sizeof log, 0) < 0)
    errx(1, "Send failed");

   while (1) {
     fprintf(stdout, "%s","> ");
     bzero(buffer,256);
     fgets(buffer,255,stdin);

     if (send(client.sockfd, buffer, sizeof buffer, 0) < 0) {
      errx(1, "Send failed");
     }
   } 
  }  

  void *receive_message() {
   while (1) {
    char server_reply[2000];
    if (recv(client.sockfd, server_reply, 2000, 0) < 0) {
         errx(1,"recv failed");

    }
    //Receive a reply from the server
    fprintf(stdout, "%s\n", server_reply);
   }
 }  

代码的某些部分不是我的，我通过搜索发现了它。您能帮我发现错误吗？