76 lines
1.9 KiB
C
76 lines
1.9 KiB
C
/* Copyright (C) 1997-2022 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <libc-lock.h>
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#include <stdlib.h>
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#include <string.h>
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#include <utmp.h>
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#include "utmp-private.h"
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/* This is the default name. */
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static const char default_file_name[] = _PATH_UTMP;
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/* Current file name. */
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const char *__libc_utmp_file_name = (const char *) default_file_name;
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/* We have to use the lock in getutent_r.c. */
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__libc_lock_define (extern, __libc_utmp_lock attribute_hidden)
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int
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__utmpname (const char *file)
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{
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int result = -1;
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__libc_lock_lock (__libc_utmp_lock);
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/* Close the old file. */
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__libc_endutent ();
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if (strcmp (file, __libc_utmp_file_name) != 0)
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{
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if (strcmp (file, default_file_name) == 0)
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{
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free ((char *) __libc_utmp_file_name);
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__libc_utmp_file_name = default_file_name;
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}
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else
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{
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char *file_name = __strdup (file);
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if (file_name == NULL)
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/* Out of memory. */
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goto done;
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if (__libc_utmp_file_name != default_file_name)
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free ((char *) __libc_utmp_file_name);
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__libc_utmp_file_name = file_name;
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}
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}
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result = 0;
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done:
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__libc_lock_unlock (__libc_utmp_lock);
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return result;
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}
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libc_hidden_def (__utmpname)
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weak_alias (__utmpname, utmpname)
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