login/getutid.c

   1 /* Copyright (C) 1996-2022 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, see
  16    <https://www.gnu.org/licenses/>.  */
  17
  18 #include <stdlib.h>
  19 #include <utmp.h>
  20
  21
  22 /* Local buffer to store the result.  */
  23 libc_freeres_ptr (static struct utmp *buffer);
  24
  25 struct utmp *
  26 __getutid (const struct utmp *id)
  27 {
  28   struct utmp *result;
  29
  30   if (buffer == NULL)
  31     {
  32       buffer = (struct utmp *) malloc (sizeof (struct utmp));
  33       if (buffer == NULL)
  34         return NULL;
  35     }
  36   if (__getutid_r (id, buffer, &result) < 0)
  37     return NULL;
  38
  39   return result;
  40 }
  41 libc_hidden_def (__getutid)
  42 weak_alias (__getutid, getutid)