lib/libc/asr/getnameinfo.c

   1 /*      $OpenBSD: getnameinfo.c,v 1.2 2013/05/27 17:31:01 eric Exp $    */
   2 /*
   3  * Copyright (c) 2012 Eric Faurot <eric@openbsd.org>
   4  *
   5  * Permission to use, copy, modify, and distribute this software for any
   6  * purpose with or without fee is hereby granted, provided that the above
   7  * copyright notice and this permission notice appear in all copies.
   8  *
   9  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  10  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  11  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  12  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  13  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  14  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  15  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  16  */
  17
  18 #include <sys/types.h>
  19 #include <netinet/in.h>
  20
  21 #include <errno.h>
  22 #include <resolv.h>
  23
  24 #include "asr.h"
  25
  26 int
  27 getnameinfo(const struct sockaddr *sa, socklen_t salen, char *host,
  28     size_t hostlen, char *serv, size_t servlen, int flags)
  29 {
  30         struct async    *as;
  31         struct async_res ar;
  32         int              saved_errno = errno;
  33
  34         res_init();
  35
  36         as = getnameinfo_async(sa, salen, host, hostlen, serv, servlen, flags,
  37             NULL);
  38         if (as == NULL) {
  39                 if (errno == ENOMEM) {
  40                         errno = saved_errno;
  41                         return (EAI_MEMORY);
  42                 }
  43                 return (EAI_SYSTEM);
  44         }
  45
  46         async_run_sync(as, &ar);
  47         if (ar.ar_gai_errno == EAI_SYSTEM)
  48                 errno = ar.ar_errno;
  49
  50         return (ar.ar_gai_errno);
  51 }