101 lines
4.0 KiB
C
101 lines
4.0 KiB
C
/*
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* Copyright (c) 2000, 2001, 2002, 2003, 2004, 2005, 2008
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* The President and Fellows of Harvard College.
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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 UNIVERSITY 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 UNIVERSITY 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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#ifndef _KERN_FCNTL_H_
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#define _KERN_FCNTL_H_
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/*
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* Constants for libc's <fcntl.h>.
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*/
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/*
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* Important
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*/
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/* Flags for open: choose one of these: */
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#define O_RDONLY 0 /* Open for read */
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#define O_WRONLY 1 /* Open for write */
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#define O_RDWR 2 /* Open for read and write */
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/* then or in any of these: */
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#define O_CREAT 4 /* Create file if it doesn't exist */
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#define O_EXCL 8 /* With O_CREAT, fail if file already exists */
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#define O_TRUNC 16 /* Truncate file upon open */
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#define O_APPEND 32 /* All writes happen at EOF (optional feature) */
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#define O_NOCTTY 64 /* Required by POSIX, != 0, but does nothing */
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/* Additional related definition */
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#define O_ACCMODE 3 /* mask for O_RDONLY/O_WRONLY/O_RDWR */
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/*
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* Not so important
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*/
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/* operation codes for flock() */
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#define LOCK_SH 1 /* shared lock */
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#define LOCK_EX 2 /* exclusive lock */
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#define LOCK_UN 3 /* release the lock */
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#define LOCK_NB 4 /* flag: don't block */
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/*
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* Mostly pretty useless
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*/
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/* fcntl() operations */
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#define F_DUPFD 0 /* like dup() but not quite */
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#define F_GETFD 1 /* get per-handle flags */
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#define F_SETFD 2 /* set per-handle flags */
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#define F_GETFL 3 /* get per-file flags (O_* open flags) */
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#define F_SETFL 4 /* set per-file flags (O_* open flags) */
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#define F_GETOWN 5 /* get process/pgroup for SIGURG and SIGIO */
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#define F_SETOWN 6 /* set process/pgroup for SIGURG and SIGIO */
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#define F_GETLK 7 /* inspect record locks */
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#define F_SETLK 8 /* acquire record locks nonblocking */
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#define F_SETLKW 9 /* acquire record locks and wait */
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/* flag for F_GETFD and F_SETFD */
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#define FD_CLOEXEC 1 /* close-on-exec */
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/* modes for fcntl (F_GETLK/SETLK) locking */
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#define F_RDLCK 0 /* shared lock */
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#define F_WRLCK 1 /* exclusive lock */
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#define F_UNLCK 2 /* unlock */
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/* struct for fcntl (F_GETLK/SETLK) locking */
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struct flock {
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off_t l_start; /* place in file */
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int l_whence; /* SEEK_SET, SEEK_CUR, or SEEK_END */
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int l_type; /* F_RDLCK or F_WRLCK */
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off_t l_len; /* length of locked region */
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pid_t l_pid; /* process that holds the lock */
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};
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#endif /* _KERN_FCNTL_H_ */
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