1 /*- 2 * Copyright (c) 1983, 1990, 1993 3 * The Regents of the University of California. All rights reserved. 4 * (c) UNIX System Laboratories, Inc. 5 * All or some portions of this file are derived from material licensed 6 * to the University of California by American Telephone and Telegraph 7 * Co. or Unix System Laboratories, Inc. and are reproduced herein with 8 * the permission of UNIX System Laboratories, Inc. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the University of 21 * California, Berkeley and its contributors. 22 * 4. Neither the name of the University nor the names of its contributors 23 * may be used to endorse or promote products derived from this software 24 * without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 29 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 36 * SUCH DAMAGE. 37 * 38 * @(#)fcntl.h 8.3 (Berkeley) 1/21/94 39 * $FreeBSD: src/sys/sys/fcntl.h,v 1.9.2.2 2001/06/03 05:00:10 dillon Exp $ 40 */ 41 42 #ifndef _SYS_FCNTL_H_ 43 #define _SYS_FCNTL_H_ 44 45 #ifndef _SYS_TYPES_H_ 46 #include <sys/types.h> 47 #endif 48 49 /* 50 * File status flags: these are used by open(2), fcntl(2). 51 * They are also used (indirectly) in the kernel file structure f_flags, 52 * which is a superset of the open/fcntl flags. Open flags and f_flags 53 * are inter-convertible using OFLAGS(fflags) and FFLAGS(oflags). 54 * Open/fcntl flags begin with O_; kernel-internal flags begin with F. 55 */ 56 /* open-only flags */ 57 #define O_RDONLY 0x0000 /* open for reading only */ 58 #define O_WRONLY 0x0001 /* open for writing only */ 59 #define O_RDWR 0x0002 /* open for reading and writing */ 60 #define O_ACCMODE 0x0003 /* mask for above modes */ 61 62 /* 63 * Kernel encoding of open mode; separate read and write bits that are 64 * independently testable: 1 greater than the above. 65 * 66 * XXX 67 * FREAD and FWRITE are excluded from the #ifdef _KERNEL so that TIOCFLUSH, 68 * which was documented to use FREAD/FWRITE, continues to work. 69 */ 70 #ifndef _POSIX_SOURCE 71 #define FREAD 0x0001 72 #define FWRITE 0x0002 73 #endif 74 #define O_NONBLOCK 0x0004 /* no delay */ 75 #define O_APPEND 0x0008 /* set append mode */ 76 #ifndef _POSIX_SOURCE 77 #define O_SHLOCK 0x0010 /* open with shared file lock */ 78 #define O_EXLOCK 0x0020 /* open with exclusive file lock */ 79 #define O_ASYNC 0x0040 /* signal pgrp when data ready */ 80 #define O_FSYNC 0x0080 /* synchronous writes */ 81 #define O_NOFOLLOW 0x0100 /* don't follow symlinks */ 82 #endif 83 #define O_SYNC 0x0080 /* Same as O_FSYNC, but POSIX */ 84 #define O_CREAT 0x0200 /* create if nonexistent */ 85 #define O_TRUNC 0x0400 /* truncate to zero length */ 86 #define O_EXCL 0x0800 /* error if already exists */ 87 #if defined(_KERNEL) || defined(_KERNEL_STRUCTURES) 88 #define FMARK 0x1000 /* mark during gc() */ 89 #define FDEFER 0x2000 /* defer for next gc pass */ 90 #define FHASLOCK 0x4000 /* descriptor holds advisory lock */ 91 #endif 92 93 /* Defined by POSIX 1003.1; BSD default, but must be distinct from O_RDONLY. */ 94 #define O_NOCTTY 0x8000 /* don't assign controlling terminal */ 95 96 /* Attempt to bypass the buffer cache */ 97 #define O_DIRECT 0x00010000 98 99 #if __POSIX_VISIBLE >= 200809 100 #define O_CLOEXEC 0x00020000 /* atomically set FD_CLOEXEC */ 101 #endif 102 #define O_FBLOCKING 0x00040000 /* force blocking I/O */ 103 #define O_FNONBLOCKING 0x00080000 /* force non-blocking I/O */ 104 #define O_FAPPEND 0x00100000 /* force append mode for write */ 105 #define O_FOFFSET 0x00200000 /* force specific offset */ 106 #define O_FSYNCWRITE 0x00400000 /* force synchronous write */ 107 #define O_FASYNCWRITE 0x00800000 /* force asynchronous write */ 108 #define FCDEVPRIV 0x01000000 /* f_data1 used for cdevpriv */ 109 #define O_UNUSED25 0x02000000 110 #define O_MAPONREAD 0x04000000 /* memory map read buffer */ 111 112 #if __POSIX_VISIBLE >= 200809 113 #define O_DIRECTORY 0x08000000 /* error if not a directory */ 114 #endif 115 116 #if defined(_KERNEL) || defined(_KERNEL_STRUCTURES) 117 #define FREVOKED 0x10000000 /* revoked by fdrevoke() */ 118 #define FAPPENDONLY 0x20000000 /* O_APPEND cannot be changed */ 119 #define FOFFSETLOCK 0x40000000 /* f_offset locked */ 120 #define FOFFSETWAKE 0x80000000 /* f_offset wakeup */ 121 #endif 122 123 #define O_FMASK (O_FBLOCKING|O_FNONBLOCKING|O_FAPPEND|O_FOFFSET|\ 124 O_FSYNCWRITE|O_FASYNCWRITE|O_MAPONREAD) 125 126 #ifdef _KERNEL 127 /* convert from open() flags to/from fflags; convert O_RD/WR to FREAD/FWRITE */ 128 #define FFLAGS(oflags) ((oflags) + 1) 129 #define OFLAGS(fflags) ((fflags) - 1) 130 131 /* 132 * Bits to save after open from the ap. Remaining bits are retained. 133 */ 134 #define FMASK (FREAD|FWRITE|FAPPEND|FASYNC|FFSYNC|FNONBLOCK|\ 135 FAPPENDONLY|FREVOKED|O_DIRECT|O_MAPONREAD) 136 /* bits settable by fcntl(F_SETFL, ...) */ 137 #define FCNTLFLAGS (FAPPEND|FASYNC|FFSYNC|FNONBLOCK|FPOSIXSHM|\ 138 O_DIRECT|O_MAPONREAD) 139 #endif 140 141 /* 142 * The O_* flags used to have only F* names, which were used in the kernel 143 * and by fcntl. We retain the F* names for the kernel f_flag field 144 * and for backward compatibility for fcntl. 145 */ 146 #ifndef _POSIX_SOURCE 147 #define FAPPEND O_APPEND /* kernel/compat */ 148 #define FASYNC O_ASYNC /* kernel/compat */ 149 #define FFSYNC O_FSYNC /* kernel */ 150 #define FNONBLOCK O_NONBLOCK /* kernel */ 151 #define FNDELAY O_NONBLOCK /* compat */ 152 #define O_NDELAY O_NONBLOCK /* compat */ 153 #endif 154 155 /* 156 * We are out of bits in f_flag (which is a short). However, 157 * the flag bits not set in FMASK are only meaningful in the 158 * initial open syscall. Those bits can thus be given a 159 * different meaning for fcntl(2). 160 */ 161 #ifndef _POSIX_SOURCE 162 163 /* 164 * Set by shm_open(3) to get automatic MAP_ASYNC behavior 165 * for POSIX shared memory objects (which are otherwise 166 * implemented as plain files). 167 */ 168 #define FPOSIXSHM O_NOFOLLOW 169 #endif 170 171 /* 172 * Constants used by "at" family of system calls. 173 */ 174 #define AT_FDCWD 0xFFFAFDCD /* invalid file descriptor */ 175 #define AT_SYMLINK_NOFOLLOW 1 176 #define AT_REMOVEDIR 2 177 #define AT_EACCESS 4 178 #define AT_SYMLINK_FOLLOW 8 179 180 /* 181 * Constants used for fcntl(2) 182 */ 183 184 /* command values */ 185 #define F_DUPFD 0 /* duplicate file descriptor */ 186 #define F_GETFD 1 /* get file descriptor flags */ 187 #define F_SETFD 2 /* set file descriptor flags */ 188 #define F_GETFL 3 /* get file status flags */ 189 #define F_SETFL 4 /* set file status flags */ 190 #ifndef _POSIX_SOURCE 191 #define F_GETOWN 5 /* get SIGIO/SIGURG proc/pgrp */ 192 #define F_SETOWN 6 /* set SIGIO/SIGURG proc/pgrp */ 193 #endif 194 #define F_GETLK 7 /* get record locking information */ 195 #define F_SETLK 8 /* set record locking information */ 196 #define F_SETLKW 9 /* F_SETLK; wait if blocked */ 197 #define F_DUP2FD 10 /* duplicate file descriptor to arg */ 198 #if __POSIX_VISIBLE >= 200809 199 #define F_DUPFD_CLOEXEC 17 /* Like F_DUPFD with FD_CLOEXEC set */ 200 #endif 201 #if __BSD_VISIBLE 202 #define F_DUP2FD_CLOEXEC 18 /* Like F_DUP2FD with FD_CLOEXEC set */ 203 #endif 204 205 /* file descriptor flags (F_GETFD, F_SETFD) */ 206 #define FD_CLOEXEC 1 /* close-on-exec flag */ 207 208 /* record locking flags (F_GETLK, F_SETLK, F_SETLKW) */ 209 #define F_RDLCK 1 /* shared or read lock */ 210 #define F_UNLCK 2 /* unlock */ 211 #define F_WRLCK 3 /* exclusive or write lock */ 212 #if defined(_KERNEL) || defined(_KERNEL_STRUCTURES) 213 #define F_WAIT 0x010 /* Wait until lock is granted */ 214 #define F_UNUSED020 0x020 215 #define F_POSIX 0x040 /* Use POSIX semantics for lock */ 216 #define F_NOEND 0x080 /* l_len = 0, internally used */ 217 #endif 218 219 220 /* 221 * Advisory file segment locking data type - 222 * information passed to system by user 223 */ 224 struct flock { 225 off_t l_start; /* starting offset */ 226 off_t l_len; /* len = 0 means until end of file */ 227 pid_t l_pid; /* lock owner */ 228 short l_type; /* lock type: read/write, etc. */ 229 short l_whence; /* type of l_start */ 230 }; 231 232 #ifdef _KERNEL 233 union fcntl_dat { 234 int fc_fd; /* F_DUPFD */ 235 int fc_cloexec; /* F_GETFD/F_SETFD */ 236 int fc_flags; /* F_GETFL/F_SETFL */ 237 int fc_owner; /* F_GETOWN/F_SETOWN */ 238 struct flock fc_flock; /* F_GETLK/F_SETLK */ 239 }; 240 #endif /* _KERNEL */ 241 242 243 #ifndef _POSIX_SOURCE 244 /* lock operations for flock(2) */ 245 #define LOCK_SH 0x01 /* shared file lock */ 246 #define LOCK_EX 0x02 /* exclusive file lock */ 247 #define LOCK_NB 0x04 /* don't block when locking */ 248 #define LOCK_UN 0x08 /* unlock file */ 249 #endif 250 251 #if !defined(_KERNEL) || defined(_KERNEL_VIRTUAL) 252 #include <sys/cdefs.h> 253 254 __BEGIN_DECLS 255 int open (const char *, int, ...); 256 #if __POSIX_VISIBLE >= 200809 257 int openat (int, const char *, int, ...); 258 #endif 259 int creat (const char *, mode_t); 260 int fcntl (int, int, ...); 261 #ifndef _POSIX_SOURCE 262 int flock (int, int); 263 #endif /* !_POSIX_SOURCE */ 264 __END_DECLS 265 #endif 266 267 #endif /* !_SYS_FCNTL_H_ */ 268