rexec: use __do_close_prot_errno

[mirror_lxc.git] / src / lxc / memory_utils.h

/* liblxcapi
 *
 * Copyright © 2019 Christian Brauner <christian.brauner@ubuntu.com>.
 * Copyright © 2019 Canonical Ltd.
 *
 * 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 2.1 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
 */

#ifndef __LXC_MEMORY_UTILS_H
#define __LXC_MEMORY_UTILS_H

#include <dirent.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <unistd.h>

static inline void __auto_free__(void *p)
{
	free(*(void **)p);
}

static inline void __auto_fclose__(FILE **f)
{
	if (*f)
		fclose(*f);
}

static inline void __auto_closedir__(DIR **d)
{
	if (*d)
		closedir(*d);
}

static inline void __auto_close__(int *fd)
{
	if (*fd >= 0) {
		int e = errno;
		close(*fd);
		errno = e;
	}
}

#define __do_close_prot_errno __attribute__((__cleanup__(__auto_close__)))
#define __do_free __attribute__((__cleanup__(__auto_free__)))
#define __do_fclose __attribute__((__cleanup__(__auto_fclose__)))
#define __do_closedir __attribute__((__cleanup__(__auto_closedir__)))

#endif /* __LXC_MEMORY_UTILS_H */