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1/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
2#ifndef _ASM_GENERIC_FCNTL_H
3#define _ASM_GENERIC_FCNTL_H
4
5#include <linux/types.h>
6
7/*
8 * FMODE_EXEC is 0x20
9 * These cannot be used by userspace O_* until internal and external open
10 * flags are split.
11 * -Eric Paris
12 */
13
14/*
15 * When introducing new O_* bits, please check its uniqueness in fcntl_init().
16 */
17
18#define O_ACCMODE 3
19#define O_RDONLY 0
20#define O_WRONLY (1 << 0)
21#define O_RDWR (1 << 1)
22/* (1 << 2) must not be used -- it collides with flags on alpha, sparc */
23/* (1 << 3) must not be used -- it collides with flags on alpha, mips, parisc, sparc */
24/* (1 << 4) must not be used -- it collides with flags on mips */
25/* (1 << 5) is free */
26#ifndef O_CREAT
27#define O_CREAT (1 << 6) /* not fcntl */
28#endif
29#ifndef O_EXCL
30#define O_EXCL (1 << 7) /* not fcntl */
31#endif
32#ifndef O_NOCTTY
33#define O_NOCTTY (1 << 8) /* not fcntl */
34#endif
35#ifndef O_TRUNC
36#define O_TRUNC (1 << 9) /* not fcntl */
37#endif
38#ifndef O_APPEND
39#define O_APPEND (1 << 10)
40#endif
41#ifndef O_NONBLOCK
42#define O_NONBLOCK (1 << 11)
43#endif
44#ifndef O_DSYNC
45#define O_DSYNC (1 << 12) /* used to be O_SYNC, see below */
46#endif
47#ifndef FASYNC
48#define FASYNC (1 << 13) /* fcntl, for BSD compatibility */
49#endif
50#ifndef O_DIRECT
51#define O_DIRECT (1 << 14) /* direct disk access hint */
52#endif
53#ifndef O_LARGEFILE
54#define O_LARGEFILE (1 << 15)
55#endif
56#ifndef O_DIRECTORY
57#define O_DIRECTORY (1 << 16) /* must be a directory */
58#endif
59#ifndef O_NOFOLLOW
60#define O_NOFOLLOW (1 << 17) /* don't follow links */
61#endif
62#ifndef O_NOATIME
63#define O_NOATIME (1 << 18)
64#endif
65#ifndef O_CLOEXEC
66#define O_CLOEXEC (1 << 19) /* set close_on_exec */
67#endif
68
69/*
70 * Before Linux 2.6.33 only O_DSYNC semantics were implemented, but using
71 * the O_SYNC flag. We continue to use the existing numerical value
72 * for O_DSYNC semantics now, but using the correct symbolic name for it.
73 * This new value is used to request true Posix O_SYNC semantics. It is
74 * defined in this strange way to make sure applications compiled against
75 * new headers get at least O_DSYNC semantics on older kernels.
76 *
77 * This has the nice side-effect that we can simply test for O_DSYNC
78 * wherever we do not care if O_DSYNC or O_SYNC is used.
79 *
80 * Note: __O_SYNC must never be used directly.
81 */
82#ifndef O_SYNC
83#define __O_SYNC (1 << 20)
84#define O_SYNC (__O_SYNC|O_DSYNC)
85#endif
86
87#ifndef O_PATH
88#define O_PATH (1 << 21)
89#endif
90
91#ifndef __O_TMPFILE
92#define __O_TMPFILE (1 << 22)
93#endif
94
95#ifndef O_EMPTYPATH
96#define O_EMPTYPATH (1 << 26) /* allow empty path */
97#endif
98
99/* a horrid kludge trying to make sure that this will fail on old kernels */
100#define O_TMPFILE (__O_TMPFILE | O_DIRECTORY)
101
102#ifndef O_NDELAY
103#define O_NDELAY O_NONBLOCK
104#endif
105
106/* (1 << 23) must not be used -- it collides with flags on alpha, parisc, sparc */
107/* (1 << 24) must not be used -- it collides with flags on alpha, sparc */
108/* (1 << 25) must not be used -- it collides with flags on sparc */
109
110#define F_DUPFD 0 /* dup */
111#define F_GETFD 1 /* get close_on_exec */
112#define F_SETFD 2 /* set/clear close_on_exec */
113#define F_GETFL 3 /* get file->f_flags */
114#define F_SETFL 4 /* set file->f_flags */
115#ifndef F_GETLK
116#define F_GETLK 5
117#define F_SETLK 6
118#define F_SETLKW 7
119#endif
120#ifndef F_SETOWN
121#define F_SETOWN 8 /* for sockets. */
122#define F_GETOWN 9 /* for sockets. */
123#endif
124#ifndef F_SETSIG
125#define F_SETSIG 10 /* for sockets. */
126#define F_GETSIG 11 /* for sockets. */
127#endif
128
129#if __BITS_PER_LONG == 32 || defined(__KERNEL__)
130#ifndef F_GETLK64
131#define F_GETLK64 12 /* using 'struct flock64' */
132#define F_SETLK64 13
133#define F_SETLKW64 14
134#endif
135#endif /* __BITS_PER_LONG == 32 || defined(__KERNEL__) */
136
137#ifndef F_SETOWN_EX
138#define F_SETOWN_EX 15
139#define F_GETOWN_EX 16
140#endif
141
142#ifndef F_GETOWNER_UIDS
143#define F_GETOWNER_UIDS 17
144#endif
145
146/*
147 * Open File Description Locks
148 *
149 * Usually record locks held by a process are released on *any* close and are
150 * not inherited across a fork().
151 *
152 * These cmd values will set locks that conflict with process-associated
153 * record locks, but are "owned" by the open file description, not the
154 * process. This means that they are inherited across fork() like BSD (flock)
155 * locks, and they are only released automatically when the last reference to
156 * the the open file against which they were acquired is put.
157 */
158#define F_OFD_GETLK 36
159#define F_OFD_SETLK 37
160#define F_OFD_SETLKW 38
161
162#define F_OWNER_TID 0
163#define F_OWNER_PID 1
164#define F_OWNER_PGRP 2
165
166struct f_owner_ex {
167 int type;
168 __kernel_pid_t pid;
169};
170
171/* for F_[GET|SET]FL */
172#define FD_CLOEXEC 1 /* actually anything with low bit set goes */
173
174/* for posix fcntl() and lockf() */
175#ifndef F_RDLCK
176#define F_RDLCK 0
177#define F_WRLCK 1
178#define F_UNLCK 2
179#endif
180
181/* for old implementation of bsd flock () */
182#ifndef F_EXLCK
183#define F_EXLCK 4 /* or 3 */
184#define F_SHLCK 8 /* or 4 */
185#endif
186
187/* operations for bsd flock(), also used by the kernel implementation */
188#define LOCK_SH 1 /* shared lock */
189#define LOCK_EX 2 /* exclusive lock */
190#define LOCK_NB 4 /* or'd with one of the above to prevent
191 blocking */
192#define LOCK_UN 8 /* remove lock */
193
194/*
195 * LOCK_MAND support has been removed from the kernel. We leave the symbols
196 * here to not break legacy builds, but these should not be used in new code.
197 */
198#define LOCK_MAND 32 /* This is a mandatory flock ... */
199#define LOCK_READ 64 /* which allows concurrent read operations */
200#define LOCK_WRITE 128 /* which allows concurrent write operations */
201#define LOCK_RW 192 /* which allows concurrent read & write ops */
202
203#define F_LINUX_SPECIFIC_BASE 1024
204
205#ifndef HAVE_ARCH_STRUCT_FLOCK
206struct flock {
207 short l_type;
208 short l_whence;
209 __kernel_off_t l_start;
210 __kernel_off_t l_len;
211 __kernel_pid_t l_pid;
212#ifdef __ARCH_FLOCK_EXTRA_SYSID
213 __ARCH_FLOCK_EXTRA_SYSID
214#endif
215#ifdef __ARCH_FLOCK_PAD
216 __ARCH_FLOCK_PAD
217#endif
218};
219
220struct flock64 {
221 short l_type;
222 short l_whence;
223 __kernel_loff_t l_start;
224 __kernel_loff_t l_len;
225 __kernel_pid_t l_pid;
226#ifdef __ARCH_FLOCK64_PAD
227 __ARCH_FLOCK64_PAD
228#endif
229};
230#endif /* HAVE_ARCH_STRUCT_FLOCK */
231
232#endif /* _ASM_GENERIC_FCNTL_H */