login/getutline_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 __getutline_r (const struct utmp *line, struct utmp *buffer,
  39                struct utmp **result)
  40 {
  41   int retval = -1;
  42
  43   __libc_lock_lock (__libc_utmp_lock);
  44
  45   /* Not yet initialized.  */
  46   if ((*__libc_utmp_jump_table->setutent) (0))
  47     retval = (*__libc_utmp_jump_table->getutline_r) (line, buffer, result);
  48   else
  49     *result = NULL;
  50
  51   __libc_lock_unlock (__libc_utmp_lock);
  52
  53   return retval;
  54 }
  55 weak_alias (__getutline_r, getutline_r)