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- /*
- * Copyright (c) 2000, 2001, 2002, 2003, 2004, 2005, 2008
- * The President and Fellows of Harvard College.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- * 3. Neither the name of the University nor the names of its contributors
- * may be used to endorse or promote products derived from this software
- * without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE UNIVERSITY AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE UNIVERSITY OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- */
- #ifndef _KERN_FCNTL_H_
- #define _KERN_FCNTL_H_
- /*
- * Constants for libc's <fcntl.h>.
- */
- /*
- * Important
- */
- /* Flags for open: choose one of these: */
- #define O_RDONLY 0 /* Open for read */
- #define O_WRONLY 1 /* Open for write */
- #define O_RDWR 2 /* Open for read and write */
- /* then or in any of these: */
- #define O_CREAT 4 /* Create file if it doesn't exist */
- #define O_EXCL 8 /* With O_CREAT, fail if file already exists */
- #define O_TRUNC 16 /* Truncate file upon open */
- #define O_APPEND 32 /* All writes happen at EOF (optional feature) */
- #define O_NOCTTY 64 /* Required by POSIX, != 0, but does nothing */
- /* Additional related definition */
- #define O_ACCMODE 3 /* mask for O_RDONLY/O_WRONLY/O_RDWR */
- /*
- * Not so important
- */
- /* operation codes for flock() */
- #define LOCK_SH 1 /* shared lock */
- #define LOCK_EX 2 /* exclusive lock */
- #define LOCK_UN 3 /* release the lock */
- #define LOCK_NB 4 /* flag: don't block */
- /*
- * Mostly pretty useless
- */
- /* fcntl() operations */
- #define F_DUPFD 0 /* like dup() but not quite */
- #define F_GETFD 1 /* get per-handle flags */
- #define F_SETFD 2 /* set per-handle flags */
- #define F_GETFL 3 /* get per-file flags (O_* open flags) */
- #define F_SETFL 4 /* set per-file flags (O_* open flags) */
- #define F_GETOWN 5 /* get process/pgroup for SIGURG and SIGIO */
- #define F_SETOWN 6 /* set process/pgroup for SIGURG and SIGIO */
- #define F_GETLK 7 /* inspect record locks */
- #define F_SETLK 8 /* acquire record locks nonblocking */
- #define F_SETLKW 9 /* acquire record locks and wait */
- /* flag for F_GETFD and F_SETFD */
- #define FD_CLOEXEC 1 /* close-on-exec */
- /* modes for fcntl (F_GETLK/SETLK) locking */
- #define F_RDLCK 0 /* shared lock */
- #define F_WRLCK 1 /* exclusive lock */
- #define F_UNLCK 2 /* unlock */
- /* struct for fcntl (F_GETLK/SETLK) locking */
- struct flock {
- off_t l_start; /* place in file */
- int l_whence; /* SEEK_SET, SEEK_CUR, or SEEK_END */
- int l_type; /* F_RDLCK or F_WRLCK */
- off_t l_len; /* length of locked region */
- pid_t l_pid; /* process that holds the lock */
- };
- #endif /* _KERN_FCNTL_H_ */
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