xref: /freebsd/sys/sys/fcntl.h (revision b00ab754)
1 /*-
2  * SPDX-License-Identifier: BSD-3-Clause
3  *
4  * Copyright (c) 1983, 1990, 1993
5  *	The Regents of the University of California.  All rights reserved.
6  * (c) UNIX System Laboratories, Inc.
7  * All or some portions of this file are derived from material licensed
8  * to the University of California by American Telephone and Telegraph
9  * Co. or Unix System Laboratories, Inc. and are reproduced herein with
10  * the permission of UNIX System Laboratories, Inc.
11  *
12  * Redistribution and use in source and binary forms, with or without
13  * modification, are permitted provided that the following conditions
14  * are met:
15  * 1. Redistributions of source code must retain the above copyright
16  *    notice, this list of conditions and the following disclaimer.
17  * 2. Redistributions in binary form must reproduce the above copyright
18  *    notice, this list of conditions and the following disclaimer in the
19  *    documentation and/or other materials provided with the distribution.
20  * 3. Neither the name of the University nor the names of its contributors
21  *    may be used to endorse or promote products derived from this software
22  *    without specific prior written permission.
23  *
24  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34  * SUCH DAMAGE.
35  *
36  *	@(#)fcntl.h	8.3 (Berkeley) 1/21/94
37  * $FreeBSD$
38  */
39 
40 #ifndef _SYS_FCNTL_H_
41 #define	_SYS_FCNTL_H_
42 
43 /*
44  * This file includes the definitions for open and fcntl
45  * described by POSIX for <fcntl.h>; it also includes
46  * related kernel definitions.
47  */
48 
49 #include <sys/cdefs.h>
50 #include <sys/_types.h>
51 
52 #ifndef _MODE_T_DECLARED
53 typedef	__mode_t	mode_t;
54 #define	_MODE_T_DECLARED
55 #endif
56 
57 #ifndef _OFF_T_DECLARED
58 typedef	__off_t		off_t;
59 #define	_OFF_T_DECLARED
60 #endif
61 
62 #ifndef _PID_T_DECLARED
63 typedef	__pid_t		pid_t;
64 #define	_PID_T_DECLARED
65 #endif
66 
67 /*
68  * File status flags: these are used by open(2), fcntl(2).
69  * They are also used (indirectly) in the kernel file structure f_flags,
70  * which is a superset of the open/fcntl flags.  Open flags and f_flags
71  * are inter-convertible using OFLAGS(fflags) and FFLAGS(oflags).
72  * Open/fcntl flags begin with O_; kernel-internal flags begin with F.
73  */
74 /* open-only flags */
75 #define	O_RDONLY	0x0000		/* open for reading only */
76 #define	O_WRONLY	0x0001		/* open for writing only */
77 #define	O_RDWR		0x0002		/* open for reading and writing */
78 #define	O_ACCMODE	0x0003		/* mask for above modes */
79 
80 /*
81  * Kernel encoding of open mode; separate read and write bits that are
82  * independently testable: 1 greater than the above.
83  *
84  * XXX
85  * FREAD and FWRITE are excluded from the #ifdef _KERNEL so that TIOCFLUSH,
86  * which was documented to use FREAD/FWRITE, continues to work.
87  */
88 #if __BSD_VISIBLE
89 #define	FREAD		0x0001
90 #define	FWRITE		0x0002
91 #endif
92 #define	O_NONBLOCK	0x0004		/* no delay */
93 #define	O_APPEND	0x0008		/* set append mode */
94 #if __BSD_VISIBLE
95 #define	O_SHLOCK	0x0010		/* open with shared file lock */
96 #define	O_EXLOCK	0x0020		/* open with exclusive file lock */
97 #define	O_ASYNC		0x0040		/* signal pgrp when data ready */
98 #define	O_FSYNC		0x0080		/* synchronous writes */
99 #endif
100 #define	O_SYNC		0x0080		/* POSIX synonym for O_FSYNC */
101 #if __POSIX_VISIBLE >= 200809
102 #define	O_NOFOLLOW	0x0100		/* don't follow symlinks */
103 #endif
104 #define	O_CREAT		0x0200		/* create if nonexistent */
105 #define	O_TRUNC		0x0400		/* truncate to zero length */
106 #define	O_EXCL		0x0800		/* error if already exists */
107 #ifdef _KERNEL
108 #define	FHASLOCK	0x4000		/* descriptor holds advisory lock */
109 #endif
110 
111 /* Defined by POSIX 1003.1; BSD default, but must be distinct from O_RDONLY. */
112 #define	O_NOCTTY	0x8000		/* don't assign controlling terminal */
113 
114 #if __BSD_VISIBLE
115 /* Attempt to bypass buffer cache */
116 #define	O_DIRECT	0x00010000
117 #endif
118 
119 #if __POSIX_VISIBLE >= 200809
120 #define	O_DIRECTORY	0x00020000	/* Fail if not directory */
121 #define	O_EXEC		0x00040000	/* Open for execute only */
122 #endif
123 #ifdef	_KERNEL
124 #define	FEXEC		O_EXEC
125 #endif
126 
127 #if __POSIX_VISIBLE >= 200809
128 /* Defined by POSIX 1003.1-2008; BSD default, but reserve for future use. */
129 #define	O_TTY_INIT	0x00080000	/* Restore default termios attributes */
130 
131 #define	O_CLOEXEC	0x00100000
132 #endif
133 
134 #if __BSD_VISIBLE
135 #define	O_VERIFY	0x00200000	/* open only after verification */
136 #endif
137 
138 /*
139  * XXX missing O_DSYNC, O_RSYNC.
140  */
141 
142 #ifdef _KERNEL
143 
144 /* Only for devfs d_close() flags. */
145 #define	FLASTCLOSE	O_DIRECTORY
146 #define	FREVOKE		O_VERIFY
147 /* Only for fo_close() from half-succeeded open */
148 #define	FOPENFAILED	O_TTY_INIT
149 
150 /* convert from open() flags to/from fflags; convert O_RD/WR to FREAD/FWRITE */
151 #define	FFLAGS(oflags)	((oflags) & O_EXEC ? (oflags) : (oflags) + 1)
152 #define	OFLAGS(fflags)	((fflags) & O_EXEC ? (fflags) : (fflags) - 1)
153 
154 /* bits to save after open */
155 #define	FMASK	(FREAD|FWRITE|FAPPEND|FASYNC|FFSYNC|FNONBLOCK|O_DIRECT|FEXEC)
156 /* bits settable by fcntl(F_SETFL, ...) */
157 #define	FCNTLFLAGS	(FAPPEND|FASYNC|FFSYNC|FNONBLOCK|FRDAHEAD|O_DIRECT)
158 
159 #if defined(COMPAT_FREEBSD7) || defined(COMPAT_FREEBSD6) || \
160     defined(COMPAT_FREEBSD5) || defined(COMPAT_FREEBSD4)
161 /*
162  * Set by shm_open(3) in older libc's to get automatic MAP_ASYNC
163  * behavior for POSIX shared memory objects (which are otherwise
164  * implemented as plain files).
165  */
166 #define	FPOSIXSHM	O_NOFOLLOW
167 #undef FCNTLFLAGS
168 #define	FCNTLFLAGS	(FAPPEND|FASYNC|FFSYNC|FNONBLOCK|FPOSIXSHM|FRDAHEAD| \
169 			 O_DIRECT)
170 #endif
171 #endif
172 
173 /*
174  * The O_* flags used to have only F* names, which were used in the kernel
175  * and by fcntl.  We retain the F* names for the kernel f_flag field
176  * and for backward compatibility for fcntl.  These flags are deprecated.
177  */
178 #if __BSD_VISIBLE
179 #define	FAPPEND		O_APPEND	/* kernel/compat */
180 #define	FASYNC		O_ASYNC		/* kernel/compat */
181 #define	FFSYNC		O_FSYNC		/* kernel */
182 #define	FNONBLOCK	O_NONBLOCK	/* kernel */
183 #define	FNDELAY		O_NONBLOCK	/* compat */
184 #define	O_NDELAY	O_NONBLOCK	/* compat */
185 #endif
186 
187 /*
188  * We are out of bits in f_flag (which is a short).  However,
189  * the flag bits not set in FMASK are only meaningful in the
190  * initial open syscall.  Those bits can thus be given a
191  * different meaning for fcntl(2).
192  */
193 #if __BSD_VISIBLE
194 /* Read ahead */
195 #define	FRDAHEAD	O_CREAT
196 #endif
197 
198 #if __POSIX_VISIBLE >= 200809
199 /*
200  * Magic value that specify the use of the current working directory
201  * to determine the target of relative file paths in the openat() and
202  * similar syscalls.
203  */
204 #define	AT_FDCWD		-100
205 
206 /*
207  * Miscellaneous flags for the *at() syscalls.
208  */
209 #define	AT_EACCESS		0x100	/* Check access using effective user and group ID */
210 #define	AT_SYMLINK_NOFOLLOW	0x200   /* Do not follow symbolic links */
211 #define	AT_SYMLINK_FOLLOW	0x400	/* Follow symbolic link */
212 #define	AT_REMOVEDIR		0x800	/* Remove directory instead of file */
213 #endif
214 
215 /*
216  * Constants used for fcntl(2)
217  */
218 
219 /* command values */
220 #define	F_DUPFD		0		/* duplicate file descriptor */
221 #define	F_GETFD		1		/* get file descriptor flags */
222 #define	F_SETFD		2		/* set file descriptor flags */
223 #define	F_GETFL		3		/* get file status flags */
224 #define	F_SETFL		4		/* set file status flags */
225 #if __XSI_VISIBLE || __POSIX_VISIBLE >= 200112
226 #define	F_GETOWN	5		/* get SIGIO/SIGURG proc/pgrp */
227 #define	F_SETOWN	6		/* set SIGIO/SIGURG proc/pgrp */
228 #endif
229 #if __BSD_VISIBLE
230 #define	F_OGETLK	7		/* get record locking information */
231 #define	F_OSETLK	8		/* set record locking information */
232 #define	F_OSETLKW	9		/* F_SETLK; wait if blocked */
233 #define	F_DUP2FD	10		/* duplicate file descriptor to arg */
234 #endif
235 #define	F_GETLK		11		/* get record locking information */
236 #define	F_SETLK		12		/* set record locking information */
237 #define	F_SETLKW	13		/* F_SETLK; wait if blocked */
238 #if __BSD_VISIBLE
239 #define	F_SETLK_REMOTE	14		/* debugging support for remote locks */
240 #define	F_READAHEAD	15		/* read ahead */
241 #define	F_RDAHEAD	16		/* Darwin compatible read ahead */
242 #endif
243 #if __POSIX_VISIBLE >= 200809
244 #define	F_DUPFD_CLOEXEC	17		/* Like F_DUPFD, but FD_CLOEXEC is set */
245 #endif
246 #if __BSD_VISIBLE
247 #define	F_DUP2FD_CLOEXEC 18		/* Like F_DUP2FD, but FD_CLOEXEC is set */
248 #endif
249 
250 /* file descriptor flags (F_GETFD, F_SETFD) */
251 #define	FD_CLOEXEC	1		/* close-on-exec flag */
252 
253 /* record locking flags (F_GETLK, F_SETLK, F_SETLKW) */
254 #define	F_RDLCK		1		/* shared or read lock */
255 #define	F_UNLCK		2		/* unlock */
256 #define	F_WRLCK		3		/* exclusive or write lock */
257 #if __BSD_VISIBLE
258 #define	F_UNLCKSYS	4		/* purge locks for a given system ID */
259 #define	F_CANCEL	5		/* cancel an async lock request */
260 #endif
261 #ifdef _KERNEL
262 #define	F_WAIT		0x010		/* Wait until lock is granted */
263 #define	F_FLOCK		0x020	 	/* Use flock(2) semantics for lock */
264 #define	F_POSIX		0x040	 	/* Use POSIX semantics for lock */
265 #define	F_REMOTE	0x080		/* Lock owner is remote NFS client */
266 #define	F_NOINTR	0x100		/* Ignore signals when waiting */
267 #endif
268 
269 /*
270  * Advisory file segment locking data type -
271  * information passed to system by user
272  */
273 struct flock {
274 	off_t	l_start;	/* starting offset */
275 	off_t	l_len;		/* len = 0 means until end of file */
276 	pid_t	l_pid;		/* lock owner */
277 	short	l_type;		/* lock type: read/write, etc. */
278 	short	l_whence;	/* type of l_start */
279 	int	l_sysid;	/* remote system id or zero for local */
280 };
281 
282 #if __BSD_VISIBLE
283 /*
284  * Old advisory file segment locking data type,
285  * before adding l_sysid.
286  */
287 struct __oflock {
288 	off_t	l_start;	/* starting offset */
289 	off_t	l_len;		/* len = 0 means until end of file */
290 	pid_t	l_pid;		/* lock owner */
291 	short	l_type;		/* lock type: read/write, etc. */
292 	short	l_whence;	/* type of l_start */
293 };
294 #endif
295 
296 #if __BSD_VISIBLE
297 /* lock operations for flock(2) */
298 #define	LOCK_SH		0x01		/* shared file lock */
299 #define	LOCK_EX		0x02		/* exclusive file lock */
300 #define	LOCK_NB		0x04		/* don't block when locking */
301 #define	LOCK_UN		0x08		/* unlock file */
302 #endif
303 
304 #if __POSIX_VISIBLE >= 200112
305 /*
306  * Advice to posix_fadvise
307  */
308 #define	POSIX_FADV_NORMAL	0	/* no special treatment */
309 #define	POSIX_FADV_RANDOM	1	/* expect random page references */
310 #define	POSIX_FADV_SEQUENTIAL	2	/* expect sequential page references */
311 #define	POSIX_FADV_WILLNEED	3	/* will need these pages */
312 #define	POSIX_FADV_DONTNEED	4	/* dont need these pages */
313 #define	POSIX_FADV_NOREUSE	5	/* access data only once */
314 #endif
315 
316 #ifndef _KERNEL
317 __BEGIN_DECLS
318 int	open(const char *, int, ...);
319 int	creat(const char *, mode_t);
320 int	fcntl(int, int, ...);
321 #if __BSD_VISIBLE
322 int	flock(int, int);
323 #endif
324 #if __POSIX_VISIBLE >= 200809
325 int	openat(int, const char *, int, ...);
326 #endif
327 #if __POSIX_VISIBLE >= 200112
328 int	posix_fadvise(int, off_t, off_t, int);
329 int	posix_fallocate(int, off_t, off_t);
330 #endif
331 __END_DECLS
332 #endif
333 
334 #endif /* !_SYS_FCNTL_H_ */
335