Annotation of sys/sys/fcntl.h, Revision 1.1
1.1 ! nbrk 1: /* $OpenBSD: fcntl.h,v 1.10 2005/12/13 00:35:23 millert Exp $ */
! 2: /* $NetBSD: fcntl.h,v 1.8 1995/03/26 20:24:12 jtc Exp $ */
! 3:
! 4: /*-
! 5: * Copyright (c) 1983, 1990, 1993
! 6: * The Regents of the University of California. All rights reserved.
! 7: * (c) UNIX System Laboratories, Inc.
! 8: * All or some portions of this file are derived from material licensed
! 9: * to the University of California by American Telephone and Telegraph
! 10: * Co. or Unix System Laboratories, Inc. and are reproduced herein with
! 11: * the permission of UNIX System Laboratories, Inc.
! 12: *
! 13: * Redistribution and use in source and binary forms, with or without
! 14: * modification, are permitted provided that the following conditions
! 15: * are met:
! 16: * 1. Redistributions of source code must retain the above copyright
! 17: * notice, this list of conditions and the following disclaimer.
! 18: * 2. Redistributions in binary form must reproduce the above copyright
! 19: * notice, this list of conditions and the following disclaimer in the
! 20: * documentation and/or other materials provided with the distribution.
! 21: * 3. Neither the name of the University nor the names of its contributors
! 22: * may be used to endorse or promote products derived from this software
! 23: * without specific prior written permission.
! 24: *
! 25: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
! 26: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
! 27: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
! 28: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
! 29: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
! 30: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
! 31: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
! 32: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
! 33: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
! 34: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
! 35: * SUCH DAMAGE.
! 36: *
! 37: * @(#)fcntl.h 8.3 (Berkeley) 1/21/94
! 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: #ifndef _KERNEL
! 51: #include <sys/types.h>
! 52: #endif
! 53:
! 54: /*
! 55: * File status flags: these are used by open(2), fcntl(2).
! 56: * They are also used (indirectly) in the kernel file structure f_flags,
! 57: * which is a superset of the open/fcntl flags. Open flags and f_flags
! 58: * are inter-convertible using OFLAGS(fflags) and FFLAGS(oflags).
! 59: * Open/fcntl flags begin with O_; kernel-internal flags begin with F.
! 60: */
! 61: /* open-only flags */
! 62: #define O_RDONLY 0x0000 /* open for reading only */
! 63: #define O_WRONLY 0x0001 /* open for writing only */
! 64: #define O_RDWR 0x0002 /* open for reading and writing */
! 65: #define O_ACCMODE 0x0003 /* mask for above modes */
! 66:
! 67: /*
! 68: * Kernel encoding of open mode; separate read and write bits that are
! 69: * independently testable: 1 greater than the above.
! 70: *
! 71: * XXX
! 72: * FREAD and FWRITE are excluded from the #ifdef _KERNEL so that TIOCFLUSH,
! 73: * which was documented to use FREAD/FWRITE, continues to work.
! 74: */
! 75: #if __BSD_VISIBLE
! 76: #define FREAD 0x0001
! 77: #define FWRITE 0x0002
! 78: #endif
! 79: #define O_NONBLOCK 0x0004 /* no delay */
! 80: #define O_APPEND 0x0008 /* set append mode */
! 81: #if __BSD_VISIBLE
! 82: #define O_SHLOCK 0x0010 /* open with shared file lock */
! 83: #define O_EXLOCK 0x0020 /* open with exclusive file lock */
! 84: #define O_ASYNC 0x0040 /* signal pgrp when data ready */
! 85: #define O_FSYNC 0x0080 /* backwards compatibility */
! 86: #define O_NOFOLLOW 0x0100 /* if path is a symlink, don't follow */
! 87: #endif
! 88: #if __POSIX_VISIBLE >= 199309 || __XPG_VISIBLE >= 420
! 89: #define O_SYNC 0x0080 /* synchronous writes */
! 90: #endif
! 91: #define O_CREAT 0x0200 /* create if nonexistant */
! 92: #define O_TRUNC 0x0400 /* truncate to zero length */
! 93: #define O_EXCL 0x0800 /* error if already exists */
! 94: #ifdef _KERNEL
! 95: #define FMARK 0x1000 /* mark during gc() */
! 96: #define FDEFER 0x2000 /* defer for next gc pass */
! 97: #define FHASLOCK 0x4000 /* descriptor holds advisory lock */
! 98: #endif
! 99:
! 100: /*
! 101: * POSIX 1003.1 specifies a higher granularity for synchronous operations
! 102: * than we support. Since synchronicity is all or nothing in OpenBSD
! 103: * we just define these to be the same as O_SYNC.
! 104: */
! 105: #define O_DSYNC O_SYNC /* synchronous data writes */
! 106: #define O_RSYNC O_SYNC /* synchronous reads */
! 107:
! 108: /* defined by POSIX 1003.1; BSD default, this bit is not required */
! 109: #define O_NOCTTY 0x8000 /* don't assign controlling terminal */
! 110:
! 111: #ifdef _KERNEL
! 112: /*
! 113: * convert from open() flags to/from fflags; convert O_RD/WR to FREAD/FWRITE.
! 114: * For out-of-range values for the flags, be slightly careful (but lossy).
! 115: */
! 116: #define FFLAGS(oflags) (((oflags) & ~O_ACCMODE) | (((oflags) + 1) & O_ACCMODE))
! 117: #define OFLAGS(fflags) (((fflags) & ~O_ACCMODE) | (((fflags) - 1) & O_ACCMODE))
! 118:
! 119: /* bits to save after open */
! 120: #define FMASK (FREAD|FWRITE|FAPPEND|FASYNC|FFSYNC|FNONBLOCK)
! 121: /* bits settable by fcntl(F_SETFL, ...) */
! 122: #define FCNTLFLAGS (FAPPEND|FASYNC|FFSYNC|FNONBLOCK)
! 123: #endif
! 124:
! 125: /*
! 126: * The O_* flags used to have only F* names, which were used in the kernel
! 127: * and by fcntl. We retain the F* names for the kernel f_flags field
! 128: * and for backward compatibility for fcntl.
! 129: */
! 130: #if __BSD_VISIBLE
! 131: #define FAPPEND O_APPEND /* kernel/compat */
! 132: #define FASYNC O_ASYNC /* kernel/compat */
! 133: #define FFSYNC O_SYNC /* kernel */
! 134: #define FNONBLOCK O_NONBLOCK /* kernel */
! 135: #define FNDELAY O_NONBLOCK /* compat */
! 136: #define O_NDELAY O_NONBLOCK /* compat */
! 137: #endif
! 138:
! 139: /*
! 140: * Constants used for fcntl(2)
! 141: */
! 142:
! 143: /* command values */
! 144: #define F_DUPFD 0 /* duplicate file descriptor */
! 145: #define F_GETFD 1 /* get file descriptor flags */
! 146: #define F_SETFD 2 /* set file descriptor flags */
! 147: #define F_GETFL 3 /* get file status flags */
! 148: #define F_SETFL 4 /* set file status flags */
! 149: #if __POSIX_VISIBLE >= 200112 || __XPG_VISIBLE >= 500
! 150: #define F_GETOWN 5 /* get SIGIO/SIGURG proc/pgrp */
! 151: #define F_SETOWN 6 /* set SIGIO/SIGURG proc/pgrp */
! 152: #endif
! 153: #define F_GETLK 7 /* get record locking information */
! 154: #define F_SETLK 8 /* set record locking information */
! 155: #define F_SETLKW 9 /* F_SETLK; wait if blocked */
! 156:
! 157: /* file descriptor flags (F_GETFD, F_SETFD) */
! 158: #define FD_CLOEXEC 1 /* close-on-exec flag */
! 159:
! 160: /* record locking flags (F_GETLK, F_SETLK, F_SETLKW) */
! 161: #define F_RDLCK 1 /* shared or read lock */
! 162: #define F_UNLCK 2 /* unlock */
! 163: #define F_WRLCK 3 /* exclusive or write lock */
! 164: #ifdef _KERNEL
! 165: #define F_WAIT 0x010 /* Wait until lock is granted */
! 166: #define F_FLOCK 0x020 /* Use flock(2) semantics for lock */
! 167: #define F_POSIX 0x040 /* Use POSIX semantics for lock */
! 168: #endif
! 169:
! 170: /*
! 171: * Advisory file segment locking data type -
! 172: * information passed to system by user
! 173: */
! 174: struct flock {
! 175: off_t l_start; /* starting offset */
! 176: off_t l_len; /* len = 0 means until end of file */
! 177: pid_t l_pid; /* lock owner */
! 178: short l_type; /* lock type: read/write, etc. */
! 179: short l_whence; /* type of l_start */
! 180: };
! 181:
! 182:
! 183: #if __BSD_VISIBLE
! 184: /* lock operations for flock(2) */
! 185: #define LOCK_SH 0x01 /* shared file lock */
! 186: #define LOCK_EX 0x02 /* exclusive file lock */
! 187: #define LOCK_NB 0x04 /* don't block when locking */
! 188: #define LOCK_UN 0x08 /* unlock file */
! 189: #endif
! 190:
! 191:
! 192: #ifndef _KERNEL
! 193: __BEGIN_DECLS
! 194: int open(const char *, int, ...);
! 195: int creat(const char *, mode_t);
! 196: int fcntl(int, int, ...);
! 197: #if __BSD_VISIBLE
! 198: int flock(int, int);
! 199: #endif
! 200: __END_DECLS
! 201: #endif
! 202:
! 203: #endif /* !_SYS_FCNTL_H_ */
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