xref: /linux/include/uapi/asm-generic/fcntl.h (revision 43b45063)
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