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 * FMODE_NONOTIFY is 0x4000000
10 * These cannot be used by userspace O_* until internal and external open
11 * flags are split.
12 * -Eric Paris
13 */
14
15/*
16 * When introducing new O_* bits, please check its uniqueness in fcntl_init().
17 */
18
19#define O_ACCMODE 00000003
20#define O_RDONLY 00000000
21#define O_WRONLY 00000001
22#define O_RDWR 00000002
23#ifndef O_CREAT
24#define O_CREAT 00000100 /* not fcntl */
25#endif
26#ifndef O_EXCL
27#define O_EXCL 00000200 /* not fcntl */
28#endif
29#ifndef O_NOCTTY
30#define O_NOCTTY 00000400 /* not fcntl */
31#endif
32#ifndef O_TRUNC
33#define O_TRUNC 00001000 /* not fcntl */
34#endif
35#ifndef O_APPEND
36#define O_APPEND 00002000
37#endif
38#ifndef O_NONBLOCK
39#define O_NONBLOCK 00004000
40#endif
41#ifndef O_DSYNC
42#define O_DSYNC 00010000 /* used to be O_SYNC, see below */
43#endif
44#ifndef FASYNC
45#define FASYNC 00020000 /* fcntl, for BSD compatibility */
46#endif
47#ifndef O_DIRECT
48#define O_DIRECT 00040000 /* direct disk access hint */
49#endif
50#ifndef O_LARGEFILE
51#define O_LARGEFILE 00100000
52#endif
53#ifndef O_DIRECTORY
54#define O_DIRECTORY 00200000 /* must be a directory */
55#endif
56#ifndef O_NOFOLLOW
57#define O_NOFOLLOW 00400000 /* don't follow links */
58#endif
59#ifndef O_NOATIME
60#define O_NOATIME 01000000
61#endif
62#ifndef O_CLOEXEC
63#define O_CLOEXEC 02000000 /* set close_on_exec */
64#endif
65
66/*
67 * Before Linux 2.6.33 only O_DSYNC semantics were implemented, but using
68 * the O_SYNC flag. We continue to use the existing numerical value
69 * for O_DSYNC semantics now, but using the correct symbolic name for it.
70 * This new value is used to request true Posix O_SYNC semantics. It is
71 * defined in this strange way to make sure applications compiled against
72 * new headers get at least O_DSYNC semantics on older kernels.
73 *
74 * This has the nice side-effect that we can simply test for O_DSYNC
75 * wherever we do not care if O_DSYNC or O_SYNC is used.
76 *
77 * Note: __O_SYNC must never be used directly.
78 */
79#ifndef O_SYNC
80#define __O_SYNC 04000000
81#define O_SYNC (__O_SYNC|O_DSYNC)
82#endif
83
84#ifndef O_PATH
85#define O_PATH 010000000
86#endif
87
88#ifndef __O_TMPFILE
89#define __O_TMPFILE 020000000
90#endif
91
92/* a horrid kludge trying to make sure that this will fail on old kernels */
93#define O_TMPFILE (__O_TMPFILE | O_DIRECTORY)
94#define O_TMPFILE_MASK (__O_TMPFILE | O_DIRECTORY | O_CREAT)
95
96#ifndef O_NDELAY
97#define O_NDELAY O_NONBLOCK
98#endif
99
100#define F_DUPFD 0 /* dup */
101#define F_GETFD 1 /* get close_on_exec */
102#define F_SETFD 2 /* set/clear close_on_exec */
103#define F_GETFL 3 /* get file->f_flags */
104#define F_SETFL 4 /* set file->f_flags */
105#ifndef F_GETLK
106#define F_GETLK 5
107#define F_SETLK 6
108#define F_SETLKW 7
109#endif
110#ifndef F_SETOWN
111#define F_SETOWN 8 /* for sockets. */
112#define F_GETOWN 9 /* for sockets. */
113#endif
114#ifndef F_SETSIG
115#define F_SETSIG 10 /* for sockets. */
116#define F_GETSIG 11 /* for sockets. */
117#endif
118
119#ifndef CONFIG_64BIT
120#ifndef F_GETLK64
121#define F_GETLK64 12 /* using 'struct flock64' */
122#define F_SETLK64 13
123#define F_SETLKW64 14
124#endif
125#endif
126
127#ifndef F_SETOWN_EX
128#define F_SETOWN_EX 15
129#define F_GETOWN_EX 16
130#endif
131
132#ifndef F_GETOWNER_UIDS
133#define F_GETOWNER_UIDS 17
134#endif
135
136/*
137 * Open File Description Locks
138 *
139 * Usually record locks held by a process are released on *any* close and are
140 * not inherited across a fork().
141 *
142 * These cmd values will set locks that conflict with process-associated
143 * record locks, but are "owned" by the open file description, not the
144 * process. This means that they are inherited across fork() like BSD (flock)
145 * locks, and they are only released automatically when the last reference to
146 * the the open file against which they were acquired is put.
147 */
148#define F_OFD_GETLK 36
149#define F_OFD_SETLK 37
150#define F_OFD_SETLKW 38
151
152#define F_OWNER_TID 0
153#define F_OWNER_PID 1
154#define F_OWNER_PGRP 2
155
156struct f_owner_ex {
157 int type;
158 __kernel_pid_t pid;
159};
160
161/* for F_[GET|SET]FL */
162#define FD_CLOEXEC 1 /* actually anything with low bit set goes */
163
164/* for posix fcntl() and lockf() */
165#ifndef F_RDLCK
166#define F_RDLCK 0
167#define F_WRLCK 1
168#define F_UNLCK 2
169#endif
170
171/* for old implementation of bsd flock () */
172#ifndef F_EXLCK
173#define F_EXLCK 4 /* or 3 */
174#define F_SHLCK 8 /* or 4 */
175#endif
176
177/* operations for bsd flock(), also used by the kernel implementation */
178#define LOCK_SH 1 /* shared lock */
179#define LOCK_EX 2 /* exclusive lock */
180#define LOCK_NB 4 /* or'd with one of the above to prevent
181 blocking */
182#define LOCK_UN 8 /* remove lock */
183
184#define LOCK_MAND 32 /* This is a mandatory flock ... */
185#define LOCK_READ 64 /* which allows concurrent read operations */
186#define LOCK_WRITE 128 /* which allows concurrent write operations */
187#define LOCK_RW 192 /* which allows concurrent read & write ops */
188
189#define F_LINUX_SPECIFIC_BASE 1024
190
191#ifndef HAVE_ARCH_STRUCT_FLOCK
192#ifndef __ARCH_FLOCK_PAD
193#define __ARCH_FLOCK_PAD
194#endif
195
196struct flock {
197 short l_type;
198 short l_whence;
199 __kernel_off_t l_start;
200 __kernel_off_t l_len;
201 __kernel_pid_t l_pid;
202 __ARCH_FLOCK_PAD
203};
204#endif
205
206#ifndef HAVE_ARCH_STRUCT_FLOCK64
207#ifndef __ARCH_FLOCK64_PAD
208#define __ARCH_FLOCK64_PAD
209#endif
210
211struct flock64 {
212 short l_type;
213 short l_whence;
214 __kernel_loff_t l_start;
215 __kernel_loff_t l_len;
216 __kernel_pid_t l_pid;
217 __ARCH_FLOCK64_PAD
218};
219#endif
220
221#endif /* _ASM_GENERIC_FCNTL_H */
222