| 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 | } |