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glibc  2.9
Functions
tst-gethnm.c File Reference
#include <netdb.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <sys/param.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>

Go to the source code of this file.

Functions

int main (void)

Function Documentation

int main ( void  )

Definition at line 14 of file tst-gethnm.c.

{
  struct hostent *ent;
  struct in_addr hostaddr;
  int result = 0;

  inet_aton ("127.0.0.1", (struct in_addr *) &hostaddr.s_addr);
  ent = gethostbyaddr (&hostaddr, sizeof (hostaddr), AF_INET);
  if (ent == NULL)
    puts ("gethostbyaddr (...) == NULL");
  else
    {
      puts ("Using gethostbyaddr(..):");
      printf ("h_name: %s\n", ent->h_name);

      if (ent->h_aliases == NULL)
       puts ("ent->h_aliases == NULL");
      else
       printf ("h_aliases[0]: %s\n", ent->h_aliases[0]);
    }

  ent = gethostbyname ("127.0.0.1");
  if (ent == NULL)
    {
      puts ("gethostbyname (\"127.0.0.1\") == NULL");
      result = 1;
    }
  else
    {
      printf ("\nNow using gethostbyname(..):\n");
      printf ("h_name: %s\n", ent->h_name);
      if (strcmp (ent->h_name, "127.0.0.1") != 0)
       {
         puts ("ent->h_name != \"127.0.0.1\"");
         result = 1;
       }

      if (ent->h_aliases == NULL)
       {
         puts ("ent->h_aliases == NULL");
         result = 1;
       }
      else
       {
         printf ("h_aliases[0]: %s\n", ent->h_aliases[0]);
         result |= ent->h_aliases[0] != NULL;
       }
    }

  return result;
}

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