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-rw-r--r--login/getutent_r.c211
1 files changed, 178 insertions, 33 deletions
diff --git a/login/getutent_r.c b/login/getutent_r.c
index e3550017f9..df9a7977ab 100644
--- a/login/getutent_r.c
+++ b/login/getutent_r.c
@@ -1,51 +1,196 @@
/* Copyright (C) 1996 Free Software Foundation, Inc.
-This file is part of the GNU C Library.
-Contributed by Ulrich Drepper <drepper@cygnus.com>, 1996.
+ This file is part of the GNU C Library.
+ Contributed by Ulrich Drepper <drepper@cygnus.com>
+ and Paul Janzen <pcj@primenet.com>, 1996.
-The GNU C Library is free software; you can redistribute it and/or
-modify it under the terms of the GNU Library General Public License as
-published by the Free Software Foundation; either version 2 of the
-License, or (at your option) any later version.
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Library General Public License as
+ published by the Free Software Foundation; either version 2 of the
+ License, or (at your option) any later version.
-The GNU C Library is distributed in the hope that it will be useful,
-but WITHOUT ANY WARRANTY; without even the implied warranty of
-MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
-Library General Public License for more details.
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Library General Public License for more details.
-You should have received a copy of the GNU Library General Public
-License along with the GNU C Library; see the file COPYING.LIB. If
-not, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
-Boston, MA 02111-1307, USA. */
+ You should have received a copy of the GNU Library General Public
+ License along with the GNU C Library; see the file COPYING.LIB. If not,
+ write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ Boston, MA 02111-1307, USA. */
-#include <unistd.h>
+#include <assert.h>
+#include <db.h>
+#include <fcntl.h>
+#include <libc-lock.h>
+#include <limits.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
#include <utmp.h>
+#include <gnu/lib-names.h>
+#include <sys/stat.h>
+#include "utmp-private.h"
+#include "../elf/link.h"
-int
-__getutent_r (struct utmp **utmp, struct utmp_data *utmp_data)
+
+/* The various backends we have. */
+static int __setutent_unknown (int reset);
+static int __getutent_r_unknown (struct utmp *buffer, struct utmp **result);
+static void __pututline_unknown (const struct utmp *data);
+static void __endutent_unknown (void);
+
+
+/* We have three jump tables: unknown, db, or file. */
+static struct utfuncs unknown_functions =
+{
+ __setutent_unknown,
+ __getutent_r_unknown,
+ NULL,
+ NULL,
+ __pututline_unknown,
+ __endutent_unknown,
+ NULL
+};
+
+/* Currently selected backend. */
+struct utfuncs *__libc_utmp_jump_table = &unknown_functions;
+
+/* The tables from the services. */
+extern struct utfuncs __libc_utmp_db_functions;
+extern struct utfuncs __libc_utmp_file_functions;
+
+
+/* We need to protect the opening of the file. */
+__libc_lock_define_initialized (, __libc_utmp_lock)
+
+void
+__setutent (void)
+{
+ __libc_lock_lock (__libc_utmp_lock);
+
+ (void) (*__libc_utmp_jump_table->setutent) (1);
+
+ __libc_lock_unlock (__libc_utmp_lock);
+}
+weak_alias (__setutent, setutent)
+
+
+static int
+__setutent_unknown (int reset)
{
- /* Open utmp file if not already done. */
- if (utmp_data->ut_fd == -1)
+ /* We have to test whether it is still not decided which backend to use. */
+ assert (__libc_utmp_jump_table == &unknown_functions);
+
+ /* See whether utmp db file exists. */
+ if ((*__libc_utmp_db_functions.setutent) (reset))
+ __libc_utmp_jump_table = &__libc_utmp_db_functions;
+ else
{
- setutent_r (utmp_data);
- if (utmp_data->ut_fd == -1)
- return -1;
+ /* Either the db file does not exist or we have other
+ problems. So use the normal file. */
+ (*__libc_utmp_file_functions.setutent) (reset);
+ __libc_utmp_jump_table = &__libc_utmp_file_functions;
}
- /* Position file correctly. */
- if (lseek (utmp_data->ut_fd, utmp_data->loc_utmp, SEEK_SET) == -1)
- return -1;
+ return 0;
+}
+
- /* Read the next entry. */
- if (read (utmp_data->ut_fd, &utmp_data->ubuf, sizeof (struct utmp))
- != sizeof (struct utmp))
- return -1;
+void
+__endutent (void)
+{
+ __libc_lock_lock (__libc_utmp_lock);
+
+ (*__libc_utmp_jump_table->endutent) ();
- /* Update position pointer. */
- utmp_data->loc_utmp += sizeof (struct utmp);
+ __libc_lock_unlock (__libc_utmp_lock);
+}
+weak_alias (__endutent, endutent)
- *utmp = &utmp_data->ubuf;
- return 0;
+static void
+__endutent_unknown (void)
+{
+ /* Huh, how do we came here? Nothing to do. */
+}
+
+
+int
+__getutent_r (struct utmp *buffer, struct utmp **result)
+{
+ int retval;
+
+ __libc_lock_lock (__libc_utmp_lock);
+
+ retval = (*__libc_utmp_jump_table->getutent_r) (buffer, result);
+
+ __libc_lock_unlock (__libc_utmp_lock);
+
+ return retval;
}
weak_alias (__getutent_r, getutent_r)
+
+
+static int
+__getutent_r_unknown (struct utmp *buffer, struct utmp **result)
+{
+ /* It is not yet initialized. */
+ __setutent_unknown (0);
+
+ return (*__libc_utmp_jump_table->getutent_r) (buffer, result);
+}
+
+
+void
+__pututline (const struct utmp *data)
+{
+ __libc_lock_lock (__libc_utmp_lock);
+
+ (*__libc_utmp_jump_table->pututline) (data);
+
+ __libc_lock_unlock (__libc_utmp_lock);
+}
+
+
+static void
+__pututline_unknown (const struct utmp *data)
+{
+ /* It is not yet initialized. */
+ __setutent_unknown (0);
+
+ (*__libc_utmp_jump_table->pututline) (data);
+}
+
+
+int
+__utmpname (const char *file)
+{
+ int result = -1;
+
+ __libc_lock_lock (__libc_utmp_lock);
+
+ /* Close the old file. */
+ (*__libc_utmp_jump_table->endutent) ();
+
+ /* Store new names. */
+ if ((*__libc_utmp_file_functions.utmpname) (file) == 0
+ && !(*__libc_utmp_db_functions.utmpname) (file) == 0)
+ {
+ /* Try to find out whether we are supposed to work with a db
+ file or not. Do this by looking for the extension ".db". */
+ const char *ext = strrchr (file, '.');
+
+ if (ext != NULL && strcmp (ext, ".db") == 0)
+ __libc_utmp_jump_table = &__libc_utmp_db_functions;
+ else
+ __libc_utmp_jump_table = &unknown_functions;
+
+ result = 0;
+ }
+
+ __libc_lock_unlock (__libc_utmp_lock);
+
+ return result;
+}
+weak_alias (__utmpname, utmpname)