login/utmp-private.h

   1 /* Internal definitions and declarations for UTMP functions.
   2    Copyright (C) 1996-2017 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4    Contributed by Ulrich Drepper <drepper@cygnus.com>
   5    and Paul Janzen <pcj@primenet.com>, 1996.
   6
   7    The GNU C Library is free software; you can redistribute it and/or
   8    modify it under the terms of the GNU Lesser General Public
   9    License as published by the Free Software Foundation; either
  10    version 2.1 of the License, or (at your option) any later version.
  11
  12    The GNU C Library is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15    Lesser General Public License for more details.
  16
  17    You should have received a copy of the GNU Lesser General Public
  18    License along with the GNU C Library; if not, see
  19    <http://www.gnu.org/licenses/>.  */
  20
  21 #ifndef _UTMP_PRIVATE_H
  22 #define _UTMP_PRIVATE_H 1
  23
  24 #include <utmp.h>
  25 #include <libc-lock.h>
  26
  27 /* The structure describing the functions in a backend.  */
  28 struct utfuncs
  29 {
  30   int (*setutent) (void);
  31   int (*getutent_r) (struct utmp *, struct utmp **);
  32   int (*getutid_r) (const struct utmp *, struct utmp *, struct utmp **);
  33   int (*getutline_r) (const struct utmp *, struct utmp *, struct utmp **);
  34   struct utmp *(*pututline) (const struct utmp *);
  35   void (*endutent) (void);
  36   int (*updwtmp) (const char *, const struct utmp *);
  37 };
  38
  39 /* The tables from the services.  */
  40 extern const struct utfuncs __libc_utmp_file_functions attribute_hidden;
  41 extern const struct utfuncs __libc_utmp_unknown_functions attribute_hidden;
  42
  43 /* Currently selected backend.  */
  44 extern const struct utfuncs *__libc_utmp_jump_table attribute_hidden;
  45
  46 /* Current file name.  */
  47 extern const char *__libc_utmp_file_name attribute_hidden;
  48
  49 /* Locks access to the global data.  */
  50 __libc_lock_define (extern, __libc_utmp_lock attribute_hidden)
  51
  52
  53 #endif /* utmp-private.h */