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 * $DragonFly: src/sys/sys/fcntl.h,v 1.12 2007/06/29 05:12:40 dillon Exp $ 41 */ 42 43 #ifndef _SYS_FCNTL_H_ 44 #define _SYS_FCNTL_H_ 45 46 #ifndef _SYS_TYPES_H_ 47 #include <sys/types.h> 48 #endif 49 50 /* 51 * File status flags: these are used by open(2), fcntl(2). 52 * They are also used (indirectly) in the kernel file structure f_flags, 53 * which is a superset of the open/fcntl flags. Open flags and f_flags 54 * are inter-convertible using OFLAGS(fflags) and FFLAGS(oflags). 55 * Open/fcntl flags begin with O_; kernel-internal flags begin with F. 56 */ 57 /* open-only flags */ 58 #define O_RDONLY 0x0000 /* open for reading only */ 59 #define O_WRONLY 0x0001 /* open for writing only */ 60 #define O_RDWR 0x0002 /* open for reading and writing */ 61 #define O_ACCMODE 0x0003 /* mask for above modes */ 62 63 /* 64 * Kernel encoding of open mode; separate read and write bits that are 65 * independently testable: 1 greater than the above. 66 * 67 * XXX 68 * FREAD and FWRITE are excluded from the #ifdef _KERNEL so that TIOCFLUSH, 69 * which was documented to use FREAD/FWRITE, continues to work. 70 */ 71 #ifndef _POSIX_SOURCE 72 #define FREAD 0x0001 73 #define FWRITE 0x0002 74 #endif 75 #define O_NONBLOCK 0x0004 /* no delay */ 76 #define O_APPEND 0x0008 /* set append mode */ 77 #ifndef _POSIX_SOURCE 78 #define O_SHLOCK 0x0010 /* open with shared file lock */ 79 #define O_EXLOCK 0x0020 /* open with exclusive file lock */ 80 #define O_ASYNC 0x0040 /* signal pgrp when data ready */ 81 #define O_FSYNC 0x0080 /* synchronous writes */ 82 #define O_NOFOLLOW 0x0100 /* don't follow symlinks */ 83 #endif 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 #ifdef _KERNEL 100 #define O_ROOTCRED 0x00020000 /* fp_open */ 101 #endif 102 103 #define O_FBLOCKING 0x00040000 /* force blocking I/O */ 104 #define O_FNONBLOCKING 0x00080000 /* force non-blocking I/O */ 105 #define O_FAPPEND 0x00100000 /* force append mode for write */ 106 #define O_FOFFSET 0x00200000 /* force specific offset */ 107 #define O_FSYNCWRITE 0x00400000 /* force synchronous write */ 108 #define O_FASYNCWRITE 0x00800000 /* force asynchronous write */ 109 #define O_FUNBUFFERED 0x01000000 /* force unbuffered (direct) I/O */ 110 #define O_FBUFFERED 0x02000000 /* force buffered I/O */ 111 #define O_MAPONREAD 0x04000000 /* memory map read buffer */ 112 113 #define O_FMASK (O_FBLOCKING|O_FNONBLOCKING|O_FAPPEND|O_FOFFSET|\ 114 O_FSYNCWRITE|O_FASYNCWRITE|O_FUNBUFFERED|O_FBUFFERED|\ 115 O_MAPONREAD) 116 117 #ifdef _KERNEL 118 /* convert from open() flags to/from fflags; convert O_RD/WR to FREAD/FWRITE */ 119 #define FFLAGS(oflags) ((oflags) + 1) 120 #define OFLAGS(fflags) ((fflags) - 1) 121 122 /* bits to save after open */ 123 #define FMASK (FREAD|FWRITE|FAPPEND|FASYNC|FFSYNC|FNONBLOCK|\ 124 O_DIRECT|O_MAPONREAD) 125 /* bits settable by fcntl(F_SETFL, ...) */ 126 #define FCNTLFLAGS (FAPPEND|FASYNC|FFSYNC|FNONBLOCK|FPOSIXSHM|\ 127 O_DIRECT|O_MAPONREAD) 128 #endif 129 130 /* 131 * The O_* flags used to have only F* names, which were used in the kernel 132 * and by fcntl. We retain the F* names for the kernel f_flag field 133 * and for backward compatibility for fcntl. 134 */ 135 #ifndef _POSIX_SOURCE 136 #define FAPPEND O_APPEND /* kernel/compat */ 137 #define FASYNC O_ASYNC /* kernel/compat */ 138 #define FFSYNC O_FSYNC /* kernel */ 139 #define FNONBLOCK O_NONBLOCK /* kernel */ 140 #define FNDELAY O_NONBLOCK /* compat */ 141 #define O_NDELAY O_NONBLOCK /* compat */ 142 #endif 143 144 /* 145 * We are out of bits in f_flag (which is a short). However, 146 * the flag bits not set in FMASK are only meaningful in the 147 * initial open syscall. Those bits can thus be given a 148 * different meaning for fcntl(2). 149 */ 150 #ifndef _POSIX_SOURCE 151 152 /* 153 * Set by shm_open(3) to get automatic MAP_ASYNC behavior 154 * for POSIX shared memory objects (which are otherwise 155 * implemented as plain files). 156 */ 157 #define FPOSIXSHM O_NOFOLLOW 158 #endif 159 160 /* 161 * Constants used for fcntl(2) 162 */ 163 164 /* command values */ 165 #define F_DUPFD 0 /* duplicate file descriptor */ 166 #define F_GETFD 1 /* get file descriptor flags */ 167 #define F_SETFD 2 /* set file descriptor flags */ 168 #define F_GETFL 3 /* get file status flags */ 169 #define F_SETFL 4 /* set file status flags */ 170 #ifndef _POSIX_SOURCE 171 #define F_GETOWN 5 /* get SIGIO/SIGURG proc/pgrp */ 172 #define F_SETOWN 6 /* set SIGIO/SIGURG proc/pgrp */ 173 #endif 174 #define F_GETLK 7 /* get record locking information */ 175 #define F_SETLK 8 /* set record locking information */ 176 #define F_SETLKW 9 /* F_SETLK; wait if blocked */ 177 178 /* file descriptor flags (F_GETFD, F_SETFD) */ 179 #define FD_CLOEXEC 1 /* close-on-exec flag */ 180 181 /* record locking flags (F_GETLK, F_SETLK, F_SETLKW) */ 182 #define F_RDLCK 1 /* shared or read lock */ 183 #define F_UNLCK 2 /* unlock */ 184 #define F_WRLCK 3 /* exclusive or write lock */ 185 #if defined(_KERNEL) || defined(_KERNEL_STRUCTURES) 186 #define F_WAIT 0x010 /* Wait until lock is granted */ 187 #define F_UNUSED020 0x020 188 #define F_POSIX 0x040 /* Use POSIX semantics for lock */ 189 #define F_NOEND 0x080 /* l_len = 0, internally used */ 190 #endif 191 192 /* 193 * Advisory file segment locking data type - 194 * information passed to system by user 195 */ 196 struct flock { 197 off_t l_start; /* starting offset */ 198 off_t l_len; /* len = 0 means until end of file */ 199 pid_t l_pid; /* lock owner */ 200 short l_type; /* lock type: read/write, etc. */ 201 short l_whence; /* type of l_start */ 202 }; 203 204 #ifdef _KERNEL 205 union fcntl_dat { 206 int fc_fd; /* F_DUPFD */ 207 int fc_cloexec; /* F_GETFD/F_SETFD */ 208 int fc_flags; /* F_GETFL/F_SETFL */ 209 int fc_owner; /* F_GETOWN/F_SETOWN */ 210 struct flock fc_flock; /* F_GETLK/F_SETLK */ 211 }; 212 #endif /* _KERNEL */ 213 214 215 #ifndef _POSIX_SOURCE 216 /* lock operations for flock(2) */ 217 #define LOCK_SH 0x01 /* shared file lock */ 218 #define LOCK_EX 0x02 /* exclusive file lock */ 219 #define LOCK_NB 0x04 /* don't block when locking */ 220 #define LOCK_UN 0x08 /* unlock file */ 221 #endif 222 223 #if !defined(_KERNEL) || defined(_KERNEL_VIRTUAL) 224 #include <sys/cdefs.h> 225 226 __BEGIN_DECLS 227 int open (const char *, int, ...); 228 int creat (const char *, mode_t); 229 int fcntl (int, int, ...); 230 #ifndef _POSIX_SOURCE 231 int flock (int, int); 232 #endif /* !_POSIX_SOURCE */ 233 __END_DECLS 234 #endif 235 236 #endif /* !_SYS_FCNTL_H_ */ 237