/* Test case for gethostbyname_r bug when buffer expansion required.  */

#include <netdb.h>

#include <arpa/inet.h>

#include <errno.h>

#include <string.h>

#include <stdio.h>

#include <stdlib.h>

#include <unistd.h>

int

main (void)

{

  const char *host = "www.gnu.org";

  /* This code approximates the example code in the library manual.  */

  struct hostent hostbuf, *hp;

  size_t hstbuflen;

  char *tmphstbuf;

  int res;

  int herr;

  hstbuflen = 16;		/* Make it way small to ensure ERANGE.  */

  /* Allocate buffer, remember to free it to avoid memory leakage.  */

  tmphstbuf = malloc (hstbuflen);

  while ((res = gethostbyname_r (host, &hostbuf, tmphstbuf, hstbuflen,

                                 &hp, &herr)) == ERANGE)

    {

      /* Enlarge the buffer.  */

      hstbuflen *= 2;

      tmphstbuf = realloc (tmphstbuf, hstbuflen);

    }

  if (res != 0 || hp == NULL)

    {

      printf ("gethostbyname_r failed: %s (errno: %m)\n", strerror (res));

      if (access ("/etc/resolv.conf", R_OK))

	{

	  puts ("DNS probably not set up");

	  return 0;

	}

      return 1;

    }

  printf ("Got: %s %s\n", hp->h_name,

	  inet_ntoa (*(struct in_addr *) hp->h_addr));

  return 0;

}