login/utmp_db.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 <assert.h>
  22 #include <db.h>
  23 #include <fcntl.h>
  24 #include <stdio.h>
  25 #include <stdlib.h>
  26 #include <string.h>
  27 #include <utmp.h>
  28 #include <sys/stat.h>
  29
  30 #include "utmp-private.h"
  31
  32
  33 /* This is the default name.  */
  34 static const char default_file_name[] = _PATH_UTMP_DB;
  35
  36 /* Current file name.  */
  37 static const char *file_name = (const char *) default_file_name;
  38
  39 /* Descriptor for database.  */
  40 #if 0
  41 /* XXX One day this will become meaningful again.  */
  42 static DB *db_fd;
  43 static char last_date[16];
  44 #endif
  45
  46 /* Our local functions.  */
  47 static int setutent_db (int reset);
  48 static void endutent_db (void);
  49 static int utmpname_db (const char *name);
  50
  51
  52 /* The jump table for the local functions.  */
  53 struct utfuncs __libc_utmp_db_functions =
  54 {
  55   setutent_db,
  56   NULL,
  57   NULL,
  58   NULL,
  59   NULL,
  60   endutent_db,
  61   utmpname_db
  62 };
  63
  64
  65 static int
  66 setutent_db (int reset)
  67 {
  68   return 0;
  69 }
  70
  71
  72 static void
  73 endutent_db (void)
  74 {
  75 }
  76
  77
  78 static int
  79 utmpname_db (const char *name)
  80 {
  81   if (strcmp (name, file_name) != 0)
  82     {
  83       if (strcmp (name, default_file_name) == 0)
  84         {
  85           if (file_name != default_file_name)
  86             free ((char *) file_name);
  87
  88           file_name = default_file_name;
  89         }
  90       else
  91         {
  92           char *new_name = __strdup (name);
  93           if (new_name == NULL)
  94             /* Out of memory.  */
  95             return -1;
  96
  97           if (file_name != default_file_name)
  98             free ((char *) file_name);
  99
 100           file_name = new_name;
 101         }
 102     }
 103   return 0;
 104 }