linux-headers (unknown)
1 /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
2 #ifndef _LINUX_OPENAT2_H
3 #define _LINUX_OPENAT2_H
4
5 #include <linux/types.h>
6
7 /*
8 * Arguments for how openat2(2) should open the target path. If only @flags and
9 * @mode are non-zero, then openat2(2) operates very similarly to openat(2).
10 *
11 * However, unlike openat(2), unknown or invalid bits in @flags result in
12 * -EINVAL rather than being silently ignored. @mode must be zero unless one of
13 * {O_CREAT, O_TMPFILE} are set.
14 *
15 * @flags: O_* flags.
16 * @mode: O_CREAT/O_TMPFILE file mode.
17 * @resolve: RESOLVE_* flags.
18 */
19 struct open_how {
20 __u64 flags;
21 __u64 mode;
22 __u64 resolve;
23 };
24
25 /* how->resolve flags for openat2(2). */
26 #define RESOLVE_NO_XDEV 0x01 /* Block mount-point crossings
27 (includes bind-mounts). */
28 #define RESOLVE_NO_MAGICLINKS 0x02 /* Block traversal through procfs-style
29 "magic-links". */
30 #define RESOLVE_NO_SYMLINKS 0x04 /* Block traversal through all symlinks
31 (implies OEXT_NO_MAGICLINKS) */
32 #define RESOLVE_BENEATH 0x08 /* Block "lexical" trickery like
33 "..", symlinks, and absolute
34 paths which escape the dirfd. */
35 #define RESOLVE_IN_ROOT 0x10 /* Make all jumps to "/" and ".."
36 be scoped inside the dirfd
37 (similar to chroot(2)). */
38 #define RESOLVE_CACHED 0x20 /* Only complete if resolution can be
39 completed through cached lookup. May
40 return -EAGAIN if that's not
41 possible. */
42
43 #endif /* _LINUX_OPENAT2_H */
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