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
95 #ifndef O_NDELAY
96 #define O_NDELAY O_NONBLOCK
97 #endif
98
99 #define F_DUPFD 0 /* dup */
100 #define F_GETFD 1 /* get close_on_exec */
101 #define F_SETFD 2 /* set/clear close_on_exec */
102 #define F_GETFL 3 /* get file->f_flags */
103 #define F_SETFL 4 /* set file->f_flags */
104 #ifndef F_GETLK
105 #define F_GETLK 5
106 #define F_SETLK 6
107 #define F_SETLKW 7
108 #endif
109 #ifndef F_SETOWN
110 #define F_SETOWN 8 /* for sockets. */
111 #define F_GETOWN 9 /* for sockets. */
112 #endif
113 #ifndef F_SETSIG
114 #define F_SETSIG 10 /* for sockets. */
115 #define F_GETSIG 11 /* for sockets. */
116 #endif
117
118 #if __BITS_PER_LONG == 32 || defined(__KERNEL__)
119 #ifndef F_GETLK64
120 #define F_GETLK64 12 /* using 'struct flock64' */
121 #define F_SETLK64 13
122 #define F_SETLKW64 14
123 #endif
124 #endif /* __BITS_PER_LONG == 32 || defined(__KERNEL__) */
125
126 #ifndef F_SETOWN_EX
127 #define F_SETOWN_EX 15
128 #define F_GETOWN_EX 16
129 #endif
130
131 #ifndef F_GETOWNER_UIDS
132 #define F_GETOWNER_UIDS 17
133 #endif
134
135 /*
136 * Open File Description Locks
137 *
138 * Usually record locks held by a process are released on *any* close and are
139 * not inherited across a fork().
140 *
141 * These cmd values will set locks that conflict with process-associated
142 * record locks, but are "owned" by the open file description, not the
143 * process. This means that they are inherited across fork() like BSD (flock)
144 * locks, and they are only released automatically when the last reference to
145 * the the open file against which they were acquired is put.
146 */
147 #define F_OFD_GETLK 36
148 #define F_OFD_SETLK 37
149 #define F_OFD_SETLKW 38
150
151 #define F_OWNER_TID 0
152 #define F_OWNER_PID 1
153 #define F_OWNER_PGRP 2
154
155 struct f_owner_ex {
156 int type;
157 __kernel_pid_t pid;
158 };
159
160 /* for F_[GET|SET]FL */
161 #define FD_CLOEXEC 1 /* actually anything with low bit set goes */
162
163 /* for posix fcntl() and lockf() */
164 #ifndef F_RDLCK
165 #define F_RDLCK 0
166 #define F_WRLCK 1
167 #define F_UNLCK 2
168 #endif
169
170 /* for old implementation of bsd flock () */
171 #ifndef F_EXLCK
172 #define F_EXLCK 4 /* or 3 */
173 #define F_SHLCK 8 /* or 4 */
174 #endif
175
176 /* operations for bsd flock(), also used by the kernel implementation */
177 #define LOCK_SH 1 /* shared lock */
178 #define LOCK_EX 2 /* exclusive lock */
179 #define LOCK_NB 4 /* or'd with one of the above to prevent
180 blocking */
181 #define LOCK_UN 8 /* remove lock */
182
183 /*
184 * LOCK_MAND support has been removed from the kernel. We leave the symbols
185 * here to not break legacy builds, but these should not be used in new code.
186 */
187 #define LOCK_MAND 32 /* This is a mandatory flock ... */
188 #define LOCK_READ 64 /* which allows concurrent read operations */
189 #define LOCK_WRITE 128 /* which allows concurrent write operations */
190 #define LOCK_RW 192 /* which allows concurrent read & write ops */
191
192 #define F_LINUX_SPECIFIC_BASE 1024
193
194 #ifndef HAVE_ARCH_STRUCT_FLOCK
195 struct flock {
196 short l_type;
197 short l_whence;
198 __kernel_off_t l_start;
199 __kernel_off_t l_len;
200 __kernel_pid_t l_pid;
201 #ifdef __ARCH_FLOCK_EXTRA_SYSID
202 __ARCH_FLOCK_EXTRA_SYSID
203 #endif
204 #ifdef __ARCH_FLOCK_PAD
205 __ARCH_FLOCK_PAD
206 #endif
207 };
208
209 struct flock64 {
210 short l_type;
211 short l_whence;
212 __kernel_loff_t l_start;
213 __kernel_loff_t l_len;
214 __kernel_pid_t l_pid;
215 #ifdef __ARCH_FLOCK64_PAD
216 __ARCH_FLOCK64_PAD
217 #endif
218 };
219 #endif /* HAVE_ARCH_STRUCT_FLOCK */
220
221 #endif /* _ASM_GENERIC_FCNTL_H */
222
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