1 /*
2 * Copyright © 2013 Christian Persch
3 *
4 * This library is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Lesser General Public
6 * License as published by the Free Software Foundation; either
7 * version 2.1 of the License, or (at your option) any later version.
8 *
9 * This library is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * Lesser General Public License for more details.
13 *
14 * You should have received a copy of the GNU Lesser General Public
15 * License along with this library; if not, write to the Free Software
16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
17 */
18
19 #include "config.h"
20
21 #ifndef _GNU_SOURCE
22 #define _GNU_SOURCE /* for O_TMPFILE */
23 #endif
24
25 #include "vteutils.h"
26
27 #include <fcntl.h>
28 #include <unistd.h>
29 #include <errno.h>
30
31 #include <glib.h>
32
33 /* Temporary define until glibc release catches up */
34 #ifdef __linux__
35
36 #include <sys/ioctl.h>
37 #include <linux/fs.h>
38
39 #ifndef O_TMPFILE
40 #ifndef __O_TMPFILE
41 #define __O_TMPFILE 020000000
42 #endif
43 #define O_TMPFILE (__O_TMPFILE | O_DIRECTORY)
44 #endif
45
46 #endif /* __linux__ */
47
48 int
_vte_mkstemp(void)49 _vte_mkstemp (void)
50 {
51 int fd;
52 gchar *file_name;
53
54 #ifdef O_TMPFILE
55 fd = open (g_get_tmp_dir (),
56 O_TMPFILE | O_EXCL | O_RDWR | O_NOATIME | O_CLOEXEC,
57 0600);
58 if (fd != -1)
59 goto done;
60
61 /* Try again with g_file_open_tmp */
62 #endif
63
64 fd = g_file_open_tmp ("vteXXXXXX", &file_name, NULL);
65 if (fd == -1)
66 return -1;
67
68 unlink (file_name);
69 g_free (file_name);
70
71 #ifdef O_NOATIME
72 do { } while (fcntl (fd, F_SETFL, O_NOATIME) == -1 && errno == EINTR);
73 #endif
74
75 #ifdef O_TMPFILE
76 done:
77 #endif
78
79 #ifdef __linux__
80 {
81 /* Mark the tmpfile as no-cow on file systems that support it.
82 *
83 * (Note that the definition of the ioctls make you think @flags would
84 * be long instead of int, but it turns out that this is not the case;
85 * see http://lwn.net/Articles/575846/ ).
86 */
87 int flags;
88
89 if (ioctl (fd, FS_IOC_GETFLAGS, &flags) == 0) {
90 flags |= FS_SECRM_FL | FS_NOATIME_FL | FS_NOCOMP_FL | FS_NOCOW_FL | FS_NODUMP_FL;
91
92 ioctl (fd, FS_IOC_SETFLAGS, &flags);
93 }
94 }
95 #endif /* __linux__ */
96
97 return fd;
98 }
99