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/*-
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* Copyright (c) 1983, 1990, 1993
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* The Regents of the University of California. All rights reserved.
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* (c) UNIX System Laboratories, Inc.
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* All or some portions of this file are derived from material licensed
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* to the University of California by American Telephone and Telegraph
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* Co. or Unix System Laboratories, Inc. and are reproduced herein with
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* the permission of UNIX System Laboratories, Inc.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)fcntl.h 8.3 (Berkeley) 1/21/94
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*/
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#ifndef _SYS_FCNTL_H_
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#define _SYS_FCNTL_H_
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/*
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* This file includes the definitions for open and fcntl
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* described by POSIX for <fcntl.h>.
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*/
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#include <sys/types.h> |
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/*
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* File status flags: these are used by open(2), fcntl(2).
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* They are also used (indirectly) in the kernel file structure f_flags,
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* which is a superset of the open/fcntl flags. Open flags and f_flags
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* are inter-convertible using OFLAGS(fflags) and FFLAGS(oflags).
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* Open/fcntl flags begin with O_; kernel-internal flags begin with F.
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*/
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/* open-only flags */
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#define O_RDONLY 0x00000000 /* open for reading only */ |
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#define O_WRONLY 0x00000001 /* open for writing only */ |
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#define O_RDWR 0x00000002 /* open for reading and writing */ |
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#define O_ACCMODE 0x00000003 /* mask for above modes */ |
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/*
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* Kernel encoding of open mode; separate read and write bits that are
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* independently testable: 1 greater than the above.
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*/
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#define FREAD 0x00000001 |
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#define FWRITE 0x00000002 |
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#define O_NONBLOCK 0x00000004 /* no delay */ |
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#define O_APPEND 0x00000008 /* set append mode */ |
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#define O_SHLOCK 0x00000010 /* open with shared file lock */ |
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#define O_EXLOCK 0x00000020 /* open with exclusive file lock */ |
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#define O_ASYNC 0x00000040 /* signal pgrp when data ready */ |
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#define O_SYNC 0x00000080 /* synchronous writes */ |
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#define O_CREAT 0x00000200 /* create if nonexistent */ |
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#define O_TRUNC 0x00000400 /* truncate to zero length */ |
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#define O_EXCL 0x00000800 /* error if already exists */ |
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#define FPIPE 0x00010000 /* pipe */ |
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/* defined by POSIX 1003.1; BSD default, so no bit required */
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#define O_NOCTTY 0 /* don't assign controlling terminal */ |
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/* convert from open() flags to/from fflags; convert O_RD/WR to FREAD/FWRITE */
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#define FFLAGS(oflags) ((oflags) + 1) |
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#define OFLAGS(fflags) ((fflags) - 1) |
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/*
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* Constants used for fcntl(2)
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*/
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/* command values */
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#define F_DUPFD 0 /* duplicate file descriptor */ |
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#define F_GETFD 1 /* get file descriptor flags */ |
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#define F_SETFD 2 /* set file descriptor flags */ |
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#define F_GETFL 3 /* get file status flags */ |
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#define F_SETFL 4 /* set file status flags */ |
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#define F_GETOWN 5 /* get SIGIO/SIGURG proc/pgrp */ |
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#define F_SETOWN 6 /* set SIGIO/SIGURG proc/pgrp */ |
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#define F_GETLK 7 /* get record locking information */ |
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#define F_SETLK 8 /* set record locking information */ |
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#define F_SETLKW 9 /* F_SETLK; wait if blocked */ |
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/* file descriptor flags (F_GETFD, F_SETFD) */
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#define FD_CLOEXEC 1 /* close-on-exec flag */ |
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/* record locking flags (F_GETLK, F_SETLK, F_SETLKW) */
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#define F_RDLCK 1 /* shared or read lock */ |
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#define F_UNLCK 2 /* unlock */ |
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#define F_WRLCK 3 /* exclusive or write lock */ |
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/*
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* Advisory file segment locking data type -
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* information passed to system by user
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*/
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struct flock {
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off_t l_start; /* starting offset */
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off_t l_len; /* len = 0 means until end of file */
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pid_t l_pid; /* lock owner */
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short l_type; /* lock type: read/write, etc. */ |
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short l_whence; /* type of l_start */ |
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}; |
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/* lock operations for flock(2) */
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#define LOCK_SH 0x01 /* shared file lock */ |
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#define LOCK_EX 0x02 /* exclusive file lock */ |
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#define LOCK_NB 0x04 /* don't block when locking */ |
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#define LOCK_UN 0x08 /* unlock file */ |
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#include <sys/cdefs.h> |
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__BEGIN_DECLS |
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int open(const char *, int, ...); |
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int creat(const char *, mode_t); |
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int fcntl(int, int, ...); |
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#if 0
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int flock(int, int);
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#endif
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__END_DECLS |
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#endif /* !_SYS_FCNTL_H_ */ |