1/* openat2 definition. Linux specific.
2 Copyright (C) 2025-2026 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
9
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
14
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, see
17 <https://www.gnu.org/licenses/>. */
18
19#ifndef _FCNTL_H
20# error "Never use <bits/openat2.h> directly; include <fcntl.h> instead."
21#endif
22
23#ifndef __glibc_has_open_how
24/* Arguments for how openat2 should open the target path. */
25struct open_how
26{
27 __uint64_t flags;
28 __uint64_t mode;
29 __uint64_t resolve;
30};
31#endif
32
33/* how->resolve flags for openat2. */
34#ifndef RESOLVE_NO_XDEV
35# define RESOLVE_NO_XDEV 0x01 /* Block mount-point crossings
36 (includes bind-mounts). */
37#endif
38#ifndef RESOLVE_NO_MAGICLINKS
39# define RESOLVE_NO_MAGICLINKS 0x02 /* Block traversal through procfs-style
40 "magic-links". */
41#endif
42#ifndef RESOLVE_NO_SYMLINKS
43# define RESOLVE_NO_SYMLINKS 0x04 /* Block traversal through all symlinks. */
44#endif
45#ifndef RESOLVE_BENEATH
46# define RESOLVE_BENEATH 0x08 /* Block "lexical" trickery like
47 "..", symlinks, and absolute
48 paths which escape the dirfd. */
49#endif
50#ifndef RESOLVE_IN_ROOT
51# define RESOLVE_IN_ROOT 0x10 /* Make all jumps to "/" and ".."
52 be scoped inside the dirfd
53 (similar to chroot). */
54#endif
55#ifndef RESOLVE_CACHED
56# define RESOLVE_CACHED 0x20 /* Only complete if resolution can be
57 completed through cached lookup. May
58 return -EAGAIN if that's not
59 possible. */
60#endif
61