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 1.3 2003/08/20 07:31:21 rob Exp $ 41 */ 42 43 #ifndef _SYS_FCNTL_H_ 44 #define _SYS_FCNTL_H_ 45 46 /* 47 * This file includes the definitions for open and fcntl 48 * described by POSIX for <fcntl.h>; it also includes 49 * related kernel definitions. 50 */ 51 52 #ifndef _KERNEL 53 #include <sys/types.h> 54 #endif 55 56 /* 57 * File status flags: these are used by open(2), fcntl(2). 58 * They are also used (indirectly) in the kernel file structure f_flags, 59 * which is a superset of the open/fcntl flags. Open flags and f_flags 60 * are inter-convertible using OFLAGS(fflags) and FFLAGS(oflags). 61 * Open/fcntl flags begin with O_; kernel-internal flags begin with F. 62 */ 63 /* open-only flags */ 64 #define O_RDONLY 0x0000 /* open for reading only */ 65 #define O_WRONLY 0x0001 /* open for writing only */ 66 #define O_RDWR 0x0002 /* open for reading and writing */ 67 #define O_ACCMODE 0x0003 /* mask for above modes */ 68 69 /* 70 * Kernel encoding of open mode; separate read and write bits that are 71 * independently testable: 1 greater than the above. 72 * 73 * XXX 74 * FREAD and FWRITE are excluded from the #ifdef _KERNEL so that TIOCFLUSH, 75 * which was documented to use FREAD/FWRITE, continues to work. 76 */ 77 #ifndef _POSIX_SOURCE 78 #define FREAD 0x0001 79 #define FWRITE 0x0002 80 #endif 81 #define O_NONBLOCK 0x0004 /* no delay */ 82 #define O_APPEND 0x0008 /* set append mode */ 83 #ifndef _POSIX_SOURCE 84 #define O_SHLOCK 0x0010 /* open with shared file lock */ 85 #define O_EXLOCK 0x0020 /* open with exclusive file lock */ 86 #define O_ASYNC 0x0040 /* signal pgrp when data ready */ 87 #define O_FSYNC 0x0080 /* synchronous writes */ 88 #define O_NOFOLLOW 0x0100 /* don't follow symlinks */ 89 #endif 90 #define O_CREAT 0x0200 /* create if nonexistent */ 91 #define O_TRUNC 0x0400 /* truncate to zero length */ 92 #define O_EXCL 0x0800 /* error if already exists */ 93 #ifdef _KERNEL 94 #define FMARK 0x1000 /* mark during gc() */ 95 #define FDEFER 0x2000 /* defer for next gc pass */ 96 #define FHASLOCK 0x4000 /* descriptor holds advisory lock */ 97 #endif 98 99 /* Defined by POSIX 1003.1; BSD default, but must be distinct from O_RDONLY. */ 100 #define O_NOCTTY 0x8000 /* don't assign controlling terminal */ 101 102 /* Attempt to bypass buffer cache */ 103 #define O_DIRECT 0x00010000 104 105 #ifdef _KERNEL 106 /* convert from open() flags to/from fflags; convert O_RD/WR to FREAD/FWRITE */ 107 #define FFLAGS(oflags) ((oflags) + 1) 108 #define OFLAGS(fflags) ((fflags) - 1) 109 110 /* bits to save after open */ 111 #define FMASK (FREAD|FWRITE|FAPPEND|FASYNC|FFSYNC|FNONBLOCK|O_DIRECT) 112 /* bits settable by fcntl(F_SETFL, ...) */ 113 #define FCNTLFLAGS (FAPPEND|FASYNC|FFSYNC|FNONBLOCK|FPOSIXSHM|O_DIRECT) 114 #endif 115 116 /* 117 * The O_* flags used to have only F* names, which were used in the kernel 118 * and by fcntl. We retain the F* names for the kernel f_flag field 119 * and for backward compatibility for fcntl. 120 */ 121 #ifndef _POSIX_SOURCE 122 #define FAPPEND O_APPEND /* kernel/compat */ 123 #define FASYNC O_ASYNC /* kernel/compat */ 124 #define FFSYNC O_FSYNC /* kernel */ 125 #define FNONBLOCK O_NONBLOCK /* kernel */ 126 #define FNDELAY O_NONBLOCK /* compat */ 127 #define O_NDELAY O_NONBLOCK /* compat */ 128 #endif 129 130 /* 131 * We are out of bits in f_flag (which is a short). However, 132 * the flag bits not set in FMASK are only meaningful in the 133 * initial open syscall. Those bits can thus be given a 134 * different meaning for fcntl(2). 135 */ 136 #ifndef _POSIX_SOURCE 137 138 /* 139 * Set by shm_open(3) to get automatic MAP_ASYNC behavior 140 * for POSIX shared memory objects (which are otherwise 141 * implemented as plain files). 142 */ 143 #define FPOSIXSHM O_NOFOLLOW 144 #endif 145 146 /* 147 * Constants used for fcntl(2) 148 */ 149 150 /* command values */ 151 #define F_DUPFD 0 /* duplicate file descriptor */ 152 #define F_GETFD 1 /* get file descriptor flags */ 153 #define F_SETFD 2 /* set file descriptor flags */ 154 #define F_GETFL 3 /* get file status flags */ 155 #define F_SETFL 4 /* set file status flags */ 156 #ifndef _POSIX_SOURCE 157 #define F_GETOWN 5 /* get SIGIO/SIGURG proc/pgrp */ 158 #define F_SETOWN 6 /* set SIGIO/SIGURG proc/pgrp */ 159 #endif 160 #define F_GETLK 7 /* get record locking information */ 161 #define F_SETLK 8 /* set record locking information */ 162 #define F_SETLKW 9 /* F_SETLK; wait if blocked */ 163 164 /* file descriptor flags (F_GETFD, F_SETFD) */ 165 #define FD_CLOEXEC 1 /* close-on-exec flag */ 166 167 /* record locking flags (F_GETLK, F_SETLK, F_SETLKW) */ 168 #define F_RDLCK 1 /* shared or read lock */ 169 #define F_UNLCK 2 /* unlock */ 170 #define F_WRLCK 3 /* exclusive or write lock */ 171 #ifdef _KERNEL 172 #define F_WAIT 0x010 /* Wait until lock is granted */ 173 #define F_FLOCK 0x020 /* Use flock(2) semantics for lock */ 174 #define F_POSIX 0x040 /* Use POSIX semantics for lock */ 175 #endif 176 177 /* 178 * Advisory file segment locking data type - 179 * information passed to system by user 180 */ 181 struct flock { 182 off_t l_start; /* starting offset */ 183 off_t l_len; /* len = 0 means until end of file */ 184 pid_t l_pid; /* lock owner */ 185 short l_type; /* lock type: read/write, etc. */ 186 short l_whence; /* type of l_start */ 187 }; 188 189 190 #ifndef _POSIX_SOURCE 191 /* lock operations for flock(2) */ 192 #define LOCK_SH 0x01 /* shared file lock */ 193 #define LOCK_EX 0x02 /* exclusive file lock */ 194 #define LOCK_NB 0x04 /* don't block when locking */ 195 #define LOCK_UN 0x08 /* unlock file */ 196 #endif 197 198 199 #ifndef _KERNEL 200 #include <sys/cdefs.h> 201 202 __BEGIN_DECLS 203 int open (const char *, int, ...); 204 int creat (const char *, mode_t); 205 int fcntl (int, int, ...); 206 #ifndef _POSIX_SOURCE 207 int flock (int, int); 208 #endif /* !_POSIX_SOURCE */ 209 __END_DECLS 210 #endif 211 212 #endif /* !_SYS_FCNTL_H_ */ 213