77 lines
2.0 KiB
C
77 lines
2.0 KiB
C
/* Copyright (C) 1997-2017 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
Contributed by Mark Kettenis <kettenis@phys.uva.nl>, 1997.
|
|
|
|
The GNU C Library is free software; you can redistribute it and/or
|
|
modify it under the terms of the GNU Lesser General Public
|
|
License as published by the Free Software Foundation; either
|
|
version 2.1 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
|
|
Lesser General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public
|
|
License along with the GNU C Library; if not, see
|
|
<http://www.gnu.org/licenses/>. */
|
|
|
|
#include <libc-lock.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <utmp.h>
|
|
|
|
#include "utmp-private.h"
|
|
|
|
|
|
/* This is the default name. */
|
|
static const char default_file_name[] = _PATH_UTMP;
|
|
|
|
/* Current file name. */
|
|
const char *__libc_utmp_file_name = (const char *) default_file_name;
|
|
|
|
/* We have to use the lock in getutent_r.c. */
|
|
__libc_lock_define (extern, __libc_utmp_lock attribute_hidden)
|
|
|
|
|
|
int
|
|
__utmpname (const char *file)
|
|
{
|
|
int result = -1;
|
|
|
|
__libc_lock_lock (__libc_utmp_lock);
|
|
|
|
/* Close the old file. */
|
|
(*__libc_utmp_jump_table->endutent) ();
|
|
__libc_utmp_jump_table = &__libc_utmp_unknown_functions;
|
|
|
|
if (strcmp (file, __libc_utmp_file_name) != 0)
|
|
{
|
|
if (strcmp (file, default_file_name) == 0)
|
|
{
|
|
free ((char *) __libc_utmp_file_name);
|
|
|
|
__libc_utmp_file_name = default_file_name;
|
|
}
|
|
else
|
|
{
|
|
char *file_name = __strdup (file);
|
|
if (file_name == NULL)
|
|
/* Out of memory. */
|
|
goto done;
|
|
|
|
if (__libc_utmp_file_name != default_file_name)
|
|
free ((char *) __libc_utmp_file_name);
|
|
|
|
__libc_utmp_file_name = file_name;
|
|
}
|
|
}
|
|
|
|
result = 0;
|
|
|
|
done:
|
|
__libc_lock_unlock (__libc_utmp_lock);
|
|
return result;
|
|
}
|
|
weak_alias (__utmpname, utmpname)
|