src/network/gethostbyaddr.c

   1 #define _GNU_SOURCE
   2
   3 #include <netdb.h>
   4 #include <errno.h>
   5 #include <stdlib.h>
   6
   7 struct hostent *gethostbyaddr(const void *a, socklen_t l, int af)
   8 {
   9         static struct hostent *h;
  10         size_t size = 63;
  11         struct hostent *res;
  12         int err;
  13         do {
  14                 free(h);
  15                 h = malloc(size+=size+1);
  16                 if (!h) {
  17                         h_errno = NO_RECOVERY;
  18                         return 0;
  19                 }
  20                 err = gethostbyaddr_r(a, l, af, h,
  21                         (void *)(h+1), size-sizeof *h, &res, &h_errno);
  22         } while (err == ERANGE);
  23         return res;
  24 }