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/*
* Copyright © 2013 Christian Persch
*
* 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
*/
#include "config.h"
#ifndef _GNU_SOURCE
#define _GNU_SOURCE /* for O_TMPFILE */
#endif
#include "vteutils.h"
#include <fcntl.h>
#include <unistd.h>
#include <errno.h>
#include <glib.h>
/* Temporary define until glibc release catches up */
#ifdef __linux__
#include <sys/ioctl.h>
#include <linux/fs.h>
#ifndef O_TMPFILE
#ifndef __O_TMPFILE
#define __O_TMPFILE 020000000
#endif
#define O_TMPFILE (__O_TMPFILE | O_DIRECTORY)
#endif
#endif /* __linux__ */
int
_vte_mkstemp (void)
{
int fd;
gchar *file_name;
#ifdef O_TMPFILE
fd = open (g_get_tmp_dir (),
O_TMPFILE | O_EXCL | O_RDWR | O_NOATIME | O_CLOEXEC,
0600);
if (fd != -1)
goto done;
/* Try again with g_file_open_tmp */
#endif
fd = g_file_open_tmp ("vteXXXXXX", &file_name, NULL);
if (fd == -1)
return -1;
unlink (file_name);
g_free (file_name);
#ifdef O_NOATIME
do { } while (fcntl (fd, F_SETFL, O_NOATIME) == -1 && errno == EINTR);
#endif
#ifdef O_TMPFILE
done:
#endif
#ifdef __linux__
{
/* Mark the tmpfile as no-cow on file systems that support it.
*
* (Note that the definition of the ioctls make you think @flags would
* be long instead of int, but it turns out that this is not the case;
* see http://lwn.net/Articles/575846/ ).
*/
int flags;
if (ioctl (fd, FS_IOC_GETFLAGS, &flags) == 0) {
flags |= FS_SECRM_FL | FS_NOATIME_FL | FS_NOCOMP_FL | FS_NOCOW_FL | FS_NODUMP_FL;
ioctl (fd, FS_IOC_SETFLAGS, &flags);
}
}
#endif /* __linux__ */
return fd;
}
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