login/getutid_r.c

   1 /* Copyright (C) 1996, 1997, 2001, 2002 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, write to the Free
  18    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  19    02111-1307 USA.  */
  20
  21 #include <bits/libc-lock.h>
  22 #include <errno.h>
  23 #include <stdlib.h>
  24 #include <utmp.h>
  25
  26 #include "utmp-private.h"
  27
  28
  29 /* We have to use the lock in getutent_r.c.  */
  30 __libc_lock_define (extern, __libc_utmp_lock attribute_hidden)
  31
  32 /* The jump table is also in getutent_r.c.  */
  33 extern struct utfuncs *__libc_utmp_jump_table;
  34
  35
  36 int
  37 __getutid_r (const struct utmp *id, struct utmp *buffer, struct utmp **result)
  38 {
  39 #if (_HAVE_UT_ID - 0) && (_HAVE_UT_TYPE - 0)
  40   int retval;
  41
  42   /* Test whether ID has any of the legal types.  */
  43   if (id->ut_type != RUN_LVL && id->ut_type != BOOT_TIME
  44       && id->ut_type != OLD_TIME && id->ut_type != NEW_TIME
  45       && id->ut_type != INIT_PROCESS && id->ut_type != LOGIN_PROCESS
  46       && id->ut_type != USER_PROCESS && id->ut_type != DEAD_PROCESS)
  47     /* No, using '<' and '>' for the test is not possible.  */
  48     {
  49       __set_errno (EINVAL);
  50       *result = NULL;
  51       return -1;
  52     }
  53
  54   __libc_lock_lock (__libc_utmp_lock);
  55
  56   retval = (*__libc_utmp_jump_table->getutid_r) (id, buffer, result);
  57
  58   __libc_lock_unlock (__libc_utmp_lock);
  59
  60   return retval;
  61 #else   /* !_HAVE_UT_ID && !_HAVE_UT_TYPE */
  62   __set_errno (ENOSYS);
  63   return -1;
  64 #endif
  65 }
  66 weak_alias (__getutid_r, getutid_r)