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