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