#include <string.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>
#include <stdlib.h>
#include <arpa/inet.h>
#include <sys/poll.h>
#include <unistd.h>
#include <errno.h>

extern int h_errno;

struct hostent* gethostbyaddr(const void *addr, socklen_t len, int type) {
  static struct hostent hostbuf;
  struct hostent *hp;
  size_t hstbuflen;
  char *tmphstbuf;
  int res;
  int herr;

  hstbuflen = 1024;
  /* Allocate buffer, remember to free it to avoid a memory leakage.  */
  tmphstbuf = malloc (hstbuflen);

  while ((res = gethostbyaddr_r (addr, len, type, &hostbuf, tmphstbuf, hstbuflen,
				  &hp, &herr)) == ERANGE)
    {
      /* Enlarge the buffer.  */
      hstbuflen *= 2;
      tmphstbuf = realloc (tmphstbuf, hstbuflen);
    }
  /*  Check for errors.  */
  if (res || hp == NULL)
    return NULL;
  return hp;
}