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/* libguestfs
* Copyright (C) 2013-2019 Red Hat Inc.
*
* This 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 of the License, or (at your option) any later version.
*
* This 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 this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
* Libguestfs uses C<CLEANUP_*> macros to simplify temporary
* allocations. They are implemented using the
* C<__attribute__((cleanup))> feature of gcc and clang. Typical
* usage is:
*
* fn ()
* {
* CLEANUP_FREE char *str = NULL;
* str = safe_asprintf (g, "foo");
* // str is freed automatically when the function returns
* }
*
* There are a few catches to be aware of with the cleanup mechanism:
*
* =over 4
*
* =item *
*
* If a cleanup variable is not initialized, then you can end up
* calling L<free(3)> with an undefined value, resulting in the
* program crashing. For this reason, you should usually initialize
* every cleanup variable with something, eg. C<NULL>
*
* =item *
*
* Don't mark variables holding return values as cleanup variables.
*
* =item *
*
* The C<main()> function shouldn't use cleanup variables since it is
* normally exited by calling L<exit(3)>, and that doesn't call the
* cleanup handlers.
*
* =back
*
* The functions in this file are used internally by the C<CLEANUP_*>
* macros. Don't call them directly.
*/
#include <config.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include "guestfs-utils.h"
#include "glthread/lock.h"
#include "hash.h"
/* Gnulib cleanups. */
void
guestfs_int_cleanup_gl_recursive_lock_unlock (void *ptr)
{
gl_recursive_lock_t *lockp = * (gl_recursive_lock_t **) ptr;
gl_recursive_lock_unlock (*lockp);
}
void
guestfs_int_cleanup_hash_free (void *ptr)
{
Hash_table *h = * (Hash_table **) ptr;
if (h)
hash_free (h);
}
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