login/getutid_r.c

   1 /* Copyright (C) 1996 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 Library General Public License as
   8    published by the Free Software Foundation; either version 2 of the
   9    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    Library General Public License for more details.
  15
  16    You should have received a copy of the GNU Library General Public
  17    License along with the GNU C Library; see the file COPYING.LIB.  If not,
  18    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  19    Boston, MA 02111-1307, USA.  */
  20
  21 #include <errno.h>
  22 #include <libc-lock.h>
  23 #include <string.h>
  24 #include <unistd.h>
  25 #include <utmp.h>
  26
  27 #include "utmp-private.h"
  28
  29
  30 /* We have to use the lock in getutent_r.c.  */
  31 __libc_lock_define (extern, __libc_utmp_lock)
  32
  33 /* The jump table is also in getutent_r.c.  */
  34 extern struct utfuncs *__libc_utmp_jump_table;
  35
  36
  37 int
  38 __getutid_r (const struct utmp *id, struct utmp *buffer, struct utmp **result)
  39 {
  40 #if (_HAVE_UT_ID - 0) && (_HAVE_UT_TYPE - 0)
  41   int retval = -1;
  42
  43   /* Test whether ID has any of the legal types.  */
  44   if (id->ut_type != RUN_LVL && id->ut_type != BOOT_TIME
  45       && id->ut_type != OLD_TIME && id->ut_type != NEW_TIME
  46       && id->ut_type != INIT_PROCESS && id->ut_type != LOGIN_PROCESS
  47       && id->ut_type != USER_PROCESS && id->ut_type != DEAD_PROCESS)
  48     /* No, using '<' and '>' for the test is not possible.  */
  49     {
  50       __set_errno (EINVAL);
  51       *result = NULL;
  52       return -1;
  53     }
  54
  55   __libc_lock_lock (__libc_utmp_lock);
  56
  57   /* Not yet initialized.  */
  58   if ((*__libc_utmp_jump_table->setutent) (0))
  59     retval = (*__libc_utmp_jump_table->getutid_r) (id, buffer, result);
  60   else
  61     *result = NULL;
  62
  63   __libc_lock_unlock (__libc_utmp_lock);
  64
  65   return retval;
  66 #else   /* !_HAVE_UT_ID && !_HAVE_UT_TYPE */
  67   __set_errno (ENOSYS);
  68   return -1;
  69 #endif
  70 }
  71 weak_alias (__getutid_r, getutid_r)