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: stable/12/sys/sys/fcntl.h 369702 2021-05-01 00:41:30Z kib $ 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 #define O_SEARCH O_EXEC 123 #endif 124 #ifdef _KERNEL 125 #define FEXEC O_EXEC 126 #define FSEARCH O_SEARCH 127 #endif 128 129 #if __POSIX_VISIBLE >= 200809 130 /* Defined by POSIX 1003.1-2008; BSD default, but reserve for future use. */ 131 #define O_TTY_INIT 0x00080000 /* Restore default termios attributes */ 132 133 #define O_CLOEXEC 0x00100000 134 #endif 135 136 #if __BSD_VISIBLE 137 #define O_VERIFY 0x00200000 /* open only after verification */ 138 /* #define O_UNUSED1 0x00400000 */ /* Was O_BENEATH */ 139 #define O_RESOLVE_BENEATH 0x00800000 /* Do not allow name resolution to walk 140 out of cwd */ 141 #endif 142 143 /* 144 * XXX missing O_DSYNC, O_RSYNC. 145 */ 146 147 #ifdef _KERNEL 148 149 /* Only for devfs d_close() flags. */ 150 #define FLASTCLOSE O_DIRECTORY 151 #define FREVOKE O_VERIFY 152 /* Only for fo_close() from half-succeeded open */ 153 #define FOPENFAILED O_TTY_INIT 154 155 /* convert from open() flags to/from fflags; convert O_RD/WR to FREAD/FWRITE */ 156 #define FFLAGS(oflags) ((oflags) & O_EXEC ? (oflags) : (oflags) + 1) 157 #define OFLAGS(fflags) ((fflags) & O_EXEC ? (fflags) : (fflags) - 1) 158 159 /* bits to save after open */ 160 #define FMASK (FREAD|FWRITE|FAPPEND|FASYNC|FFSYNC|FNONBLOCK|O_DIRECT|FEXEC) 161 /* bits settable by fcntl(F_SETFL, ...) */ 162 #define FCNTLFLAGS (FAPPEND|FASYNC|FFSYNC|FNONBLOCK|FRDAHEAD|O_DIRECT) 163 164 #if defined(COMPAT_FREEBSD7) || defined(COMPAT_FREEBSD6) || \ 165 defined(COMPAT_FREEBSD5) || defined(COMPAT_FREEBSD4) 166 /* 167 * Set by shm_open(3) in older libc's to get automatic MAP_ASYNC 168 * behavior for POSIX shared memory objects (which are otherwise 169 * implemented as plain files). 170 */ 171 #define FPOSIXSHM O_NOFOLLOW 172 #undef FCNTLFLAGS 173 #define FCNTLFLAGS (FAPPEND|FASYNC|FFSYNC|FNONBLOCK|FPOSIXSHM|FRDAHEAD| \ 174 O_DIRECT) 175 #endif 176 #endif 177 178 /* 179 * The O_* flags used to have only F* names, which were used in the kernel 180 * and by fcntl. We retain the F* names for the kernel f_flag field 181 * and for backward compatibility for fcntl. These flags are deprecated. 182 */ 183 #if __BSD_VISIBLE 184 #define FAPPEND O_APPEND /* kernel/compat */ 185 #define FASYNC O_ASYNC /* kernel/compat */ 186 #define FFSYNC O_FSYNC /* kernel */ 187 #define FNONBLOCK O_NONBLOCK /* kernel */ 188 #define FNDELAY O_NONBLOCK /* compat */ 189 #define O_NDELAY O_NONBLOCK /* compat */ 190 #endif 191 192 /* 193 * We are out of bits in f_flag (which is a short). However, 194 * the flag bits not set in FMASK are only meaningful in the 195 * initial open syscall. Those bits can thus be given a 196 * different meaning for fcntl(2). 197 */ 198 #if __BSD_VISIBLE 199 /* Read ahead */ 200 #define FRDAHEAD O_CREAT 201 #endif 202 203 #if __POSIX_VISIBLE >= 200809 204 /* 205 * Magic value that specify the use of the current working directory 206 * to determine the target of relative file paths in the openat() and 207 * similar syscalls. 208 */ 209 #define AT_FDCWD -100 210 211 /* 212 * Miscellaneous flags for the *at() syscalls. 213 */ 214 #define AT_EACCESS 0x0100 /* Check access using effective user 215 and group ID */ 216 #define AT_SYMLINK_NOFOLLOW 0x0200 /* Do not follow symbolic links */ 217 #define AT_SYMLINK_FOLLOW 0x0400 /* Follow symbolic link */ 218 #define AT_REMOVEDIR 0x0800 /* Remove directory instead of file */ 219 #endif /* __POSIX_VISIBLE >= 200809 */ 220 #if __BSD_VISIBLE 221 /* #define AT_UNUSED1 0x1000 *//* Was AT_BENEATH */ 222 #define AT_RESOLVE_BENEATH 0x2000 /* Do not allow name resolution 223 to walk out of dirfd */ 224 #endif /* __BSD_VISIBLE */ 225 226 /* 227 * Constants used for fcntl(2) 228 */ 229 230 /* command values */ 231 #define F_DUPFD 0 /* duplicate file descriptor */ 232 #define F_GETFD 1 /* get file descriptor flags */ 233 #define F_SETFD 2 /* set file descriptor flags */ 234 #define F_GETFL 3 /* get file status flags */ 235 #define F_SETFL 4 /* set file status flags */ 236 #if __XSI_VISIBLE || __POSIX_VISIBLE >= 200112 237 #define F_GETOWN 5 /* get SIGIO/SIGURG proc/pgrp */ 238 #define F_SETOWN 6 /* set SIGIO/SIGURG proc/pgrp */ 239 #endif 240 #if __BSD_VISIBLE 241 #define F_OGETLK 7 /* get record locking information */ 242 #define F_OSETLK 8 /* set record locking information */ 243 #define F_OSETLKW 9 /* F_SETLK; wait if blocked */ 244 #define F_DUP2FD 10 /* duplicate file descriptor to arg */ 245 #endif 246 #define F_GETLK 11 /* get record locking information */ 247 #define F_SETLK 12 /* set record locking information */ 248 #define F_SETLKW 13 /* F_SETLK; wait if blocked */ 249 #if __BSD_VISIBLE 250 #define F_SETLK_REMOTE 14 /* debugging support for remote locks */ 251 #define F_READAHEAD 15 /* read ahead */ 252 #define F_RDAHEAD 16 /* Darwin compatible read ahead */ 253 #endif 254 #if __POSIX_VISIBLE >= 200809 255 #define F_DUPFD_CLOEXEC 17 /* Like F_DUPFD, but FD_CLOEXEC is set */ 256 #endif 257 #if __BSD_VISIBLE 258 #define F_DUP2FD_CLOEXEC 18 /* Like F_DUP2FD, but FD_CLOEXEC is set */ 259 #endif 260 261 /* file descriptor flags (F_GETFD, F_SETFD) */ 262 #define FD_CLOEXEC 1 /* close-on-exec flag */ 263 264 /* record locking flags (F_GETLK, F_SETLK, F_SETLKW) */ 265 #define F_RDLCK 1 /* shared or read lock */ 266 #define F_UNLCK 2 /* unlock */ 267 #define F_WRLCK 3 /* exclusive or write lock */ 268 #if __BSD_VISIBLE 269 #define F_UNLCKSYS 4 /* purge locks for a given system ID */ 270 #define F_CANCEL 5 /* cancel an async lock request */ 271 #endif 272 #ifdef _KERNEL 273 #define F_WAIT 0x010 /* Wait until lock is granted */ 274 #define F_FLOCK 0x020 /* Use flock(2) semantics for lock */ 275 #define F_POSIX 0x040 /* Use POSIX semantics for lock */ 276 #define F_REMOTE 0x080 /* Lock owner is remote NFS client */ 277 #define F_NOINTR 0x100 /* Ignore signals when waiting */ 278 #endif 279 280 /* 281 * Advisory file segment locking data type - 282 * information passed to system by user 283 */ 284 struct flock { 285 off_t l_start; /* starting offset */ 286 off_t l_len; /* len = 0 means until end of file */ 287 pid_t l_pid; /* lock owner */ 288 short l_type; /* lock type: read/write, etc. */ 289 short l_whence; /* type of l_start */ 290 int l_sysid; /* remote system id or zero for local */ 291 }; 292 293 #if __BSD_VISIBLE 294 /* 295 * Old advisory file segment locking data type, 296 * before adding l_sysid. 297 */ 298 struct __oflock { 299 off_t l_start; /* starting offset */ 300 off_t l_len; /* len = 0 means until end of file */ 301 pid_t l_pid; /* lock owner */ 302 short l_type; /* lock type: read/write, etc. */ 303 short l_whence; /* type of l_start */ 304 }; 305 #endif 306 307 #if __BSD_VISIBLE 308 /* lock operations for flock(2) */ 309 #define LOCK_SH 0x01 /* shared file lock */ 310 #define LOCK_EX 0x02 /* exclusive file lock */ 311 #define LOCK_NB 0x04 /* don't block when locking */ 312 #define LOCK_UN 0x08 /* unlock file */ 313 #endif 314 315 #if __POSIX_VISIBLE >= 200112 316 /* 317 * Advice to posix_fadvise 318 */ 319 #define POSIX_FADV_NORMAL 0 /* no special treatment */ 320 #define POSIX_FADV_RANDOM 1 /* expect random page references */ 321 #define POSIX_FADV_SEQUENTIAL 2 /* expect sequential page references */ 322 #define POSIX_FADV_WILLNEED 3 /* will need these pages */ 323 #define POSIX_FADV_DONTNEED 4 /* dont need these pages */ 324 #define POSIX_FADV_NOREUSE 5 /* access data only once */ 325 #endif 326 327 #ifndef _KERNEL 328 __BEGIN_DECLS 329 int open(const char *, int, ...); 330 int creat(const char *, mode_t); 331 int fcntl(int, int, ...); 332 #if __BSD_VISIBLE 333 int flock(int, int); 334 #endif 335 #if __POSIX_VISIBLE >= 200809 336 int openat(int, const char *, int, ...); 337 #endif 338 #if __POSIX_VISIBLE >= 200112 339 int posix_fadvise(int, off_t, off_t, int); 340 int posix_fallocate(int, off_t, off_t); 341 #endif 342 __END_DECLS 343 #endif 344 345 #endif /* !_SYS_FCNTL_H_ */ 346