login/getutid.c

   1 /* Copyright (C) 1996-2016 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3    Contributed by Ulrich Drepper <drepper@cygnus.com>, 1996.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <http://www.gnu.org/licenses/>.  */
  18
  19 #include <stdlib.h>
  20 #include <utmp.h>
  21
  22
  23 /* Local buffer to store the result.  */
  24 libc_freeres_ptr (static struct utmp *buffer);
  25
  26 struct utmp *
  27 __getutid (const struct utmp *id)
  28 {
  29   struct utmp *result;
  30
  31   if (buffer == NULL)
  32     {
  33       buffer = (struct utmp *) malloc (sizeof (struct utmp));
  34       if (buffer == NULL)
  35         return NULL;
  36     }
  37   if (__getutid_r (id, buffer, &result) < 0)
  38     return NULL;
  39
  40   return result;
  41 }
  42 weak_alias (__getutid, getutid)