리눅스 ubuntu에서 네트웍 프로그래밍중 오류가 생겼어요

   #include <stdlib.h>
   #include <string.h>
   #include <unistd.h>
   #include <arpa/inet.h>
   #include <sys/types.h>
   #include <sys/socket.h>
 
   void error_handling(char* message);
 
  int mian(int argc, char* argv[])
  {
      int server_socket;
      int client_socket;
     struct sockaddr_in server_addr;
      struct sockaddr_in client_addr;
      int client_addr_size;
 
      char message[]="hello World!\n";
 
      if(argc != 2)
      {
          printf("Usage : %s <port>\n", argv[0]);
          exit(1);
      }
 
     server_socket = socket(PF_INET, SOCK_STREAM, 0);
      if(server_socket == -1)
          error_handling("socket() error");
 
      memset(&server_addr, 0, sizeof(server_addr));
      server_addr.sin_family = AF_INET;
      server_addr.sin_addr.s_addr = htonl(INADDR_ANY);
      server_addr.sin_port = htons(atoi(argv[1]));
 
      if( bind(server_socket, (struct sockaddr*)&server_addr, sizeof(server_addr)) == -1)
          error_handling("bind() error");
 
      if(listen(server_socket, 5) == -1)
         error_handling("listen() error");
 
      client_addr_size = sizeof(client_addr);
 
      client_socket = accept(server_socket, (struct sockaddr*)&client_addr, &client_addr_size);
      if(client_socket == -1)
          error_handling("accept() error");
 
      write(client_socket, message, sizeof(message));
      close(client_socket);
 
      return 0;
  }
 
  void error_handling(char* message)
  {
      fputs(message, stderr);
      fputc('\n', stderr);
      exit(1);
  }