login/getutid_r.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 <libc-lock.h>
  19 #include <errno.h>
  20 #include <stdlib.h>
  21 #include <utmp.h>
  22
  23 #include "utmp-private.h"
  24
  25
  26 /* We have to use the lock in getutent_r.c.  */
  27 __libc_lock_define (extern, __libc_utmp_lock attribute_hidden)
  28
  29
  30 int
  31 __getutid_r (const struct utmp *id, struct utmp *buffer, struct utmp **result)
  32 {
  33   int retval;
  34
  35   /* Test whether ID has any of the legal types.  */
  36   if (id->ut_type != RUN_LVL && id->ut_type != BOOT_TIME
  37       && id->ut_type != OLD_TIME && id->ut_type != NEW_TIME
  38       && id->ut_type != INIT_PROCESS && id->ut_type != LOGIN_PROCESS
  39       && id->ut_type != USER_PROCESS && id->ut_type != DEAD_PROCESS)
  40     /* No, using '<' and '>' for the test is not possible.  */
  41     {
  42       __set_errno (EINVAL);
  43       *result = NULL;
  44       return -1;
  45     }
  46
  47   __libc_lock_lock (__libc_utmp_lock);
  48
  49   retval = __libc_getutid_r (id, buffer, result);
  50
  51   __libc_lock_unlock (__libc_utmp_lock);
  52
  53   return retval;
  54 }
  55 libc_hidden_def (__getutid_r)
  56 weak_alias (__getutid_r, getutid_r)