login/getutid_r.c

   1 /* Copyright (C) 1996-2021 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3    Contributed by Ulrich Drepper <drepper@cygnus.com>
   4    and Paul Janzen <pcj@primenet.com>, 1996.
   5
   6    The GNU C Library is free software; you can redistribute it and/or
   7    modify it under the terms of the GNU Lesser General Public
   8    License as published by the Free Software Foundation; either
   9    version 2.1 of the License, or (at your option) any later version.
  10
  11    The GNU C Library is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14    Lesser General Public License for more details.
  15
  16    You should have received a copy of the GNU Lesser General Public
  17    License along with the GNU C Library; if not, see
  18    <https://www.gnu.org/licenses/>.  */
  19
  20 #include <libc-lock.h>
  21 #include <errno.h>
  22 #include <stdlib.h>
  23 #include <utmp.h>
  24
  25 #include "utmp-private.h"
  26
  27
  28 /* We have to use the lock in getutent_r.c.  */
  29 __libc_lock_define (extern, __libc_utmp_lock attribute_hidden)
  30
  31
  32 int
  33 __getutid_r (const struct utmp *id, struct utmp *buffer, struct utmp **result)
  34 {
  35   int retval;
  36
  37   /* Test whether ID has any of the legal types.  */
  38   if (id->ut_type != RUN_LVL && id->ut_type != BOOT_TIME
  39       && id->ut_type != OLD_TIME && id->ut_type != NEW_TIME
  40       && id->ut_type != INIT_PROCESS && id->ut_type != LOGIN_PROCESS
  41       && id->ut_type != USER_PROCESS && id->ut_type != DEAD_PROCESS)
  42     /* No, using '<' and '>' for the test is not possible.  */
  43     {
  44       __set_errno (EINVAL);
  45       *result = NULL;
  46       return -1;
  47     }
  48
  49   __libc_lock_lock (__libc_utmp_lock);
  50
  51   retval = __libc_getutid_r (id, buffer, result);
  52
  53   __libc_lock_unlock (__libc_utmp_lock);
  54
  55   return retval;
  56 }
  57 libc_hidden_def (__getutid_r)
  58 weak_alias (__getutid_r, getutid_r)