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glibc/login/utmpname.c
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/* Copyright (C) 1997-2016 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) |