text: /* O_*, F_*, FD_* bit values for Linux.
     Copyright (C) 2000 Free Software Foundation, Inc.
     This file is part of the GNU C Library.
  
     The GNU C Library is free software; you can redistribute it and/or
     modify it under the terms of the GNU Lesser General Public
     License as published by the Free Software Foundation; either
     version 2.1 of the License, or (at your option) any later version.
  
     The GNU C Library is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
     Lesser General Public License for more details.
  
     You should have received a copy of the GNU Lesser General Public
     License along with the GNU C Library; if not, write to the Free
     Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
     02111-1307 USA.  */
  
  #ifndef	_FCNTL_H
  # error "Never use <bits/fcntl.h> directly; include <fcntl.h> instead."
  #endif
  
  
  #include <sys/types.h>
  #ifdef __USE_GNU
  # include <bits/uio.h>
  #endif
  
  /* open/fcntl - O_SYNC is only implemented on blocks devices and on files
     located on an ext2 file system */
  #define O_ACCMODE	   0003
  #define O_RDONLY	     00
  #define O_WRONLY	     01
  #define O_RDWR		     02
  #define O_CREAT		   0100	/* not fcntl */
  #define O_EXCL		   0200	/* not fcntl */
  #define O_NOCTTY	   0400	/* not fcntl */
  #define O_TRUNC		  01000	/* not fcntl */
  #define O_APPEND	  02000
  #define O_NONBLOCK	  04000
  #define O_NDELAY	O_NONBLOCK
  #define O_SYNC		 010000
  #define O_FSYNC		 O_SYNC
  #define O_ASYNC		 020000
  
  #ifdef __USE_GNU
  # define O_DIRECTORY	 0200000	/* Must be a directory.	 */
  # define O_NOFOLLOW	0400000	/* Do not follow links.	 */
  # define O_DIRECT	040000	/* Direct disk access.	*/
  # define O_NOATIME     01000000 /* Do not set atime.  */
  # define O_CLOEXEC     02000000 /* set close_on_exec */
  #endif
  
  /* For now Linux has synchronisity options for data and read operations.
     We define the symbols here but let them do the same as O_SYNC since
     this is a superset.	*/
  #if defined __USE_POSIX199309 || defined __USE_UNIX98
  # define O_DSYNC	O_SYNC	/* Synchronize data.  */
  # define O_RSYNC	O_SYNC	/* Synchronize read operations.	 */
  #endif
  
  #ifdef __USE_LARGEFILE64
  # define O_LARGEFILE	0100000
  #endif
  
  /* Values for the second argument to `fcntl'.  */
  #define F_DUPFD		0	/* Duplicate file descriptor.  */
  #define F_GETFD		1	/* Get file descriptor flags.  */
  #define F_SETFD		2	/* Set file descriptor flags.  */
  #define F_GETFL		3	/* Get file status flags.  */
  #define F_SETFL		4	/* Set file status flags.  */
  #ifndef __USE_FILE_OFFSET64
  # define F_GETLK	5	/* Get record locking info.  */
  # define F_SETLK	6	/* Set record locking info (non-blocking).  */
  # define F_SETLKW	7	/* Set record locking info (blocking).	*/
  #else
  # define F_GETLK	F_GETLK64  /* Get record locking info.	*/
  # define F_SETLK	F_SETLK64  /* Set record locking info (non-blocking).*/
  # define F_SETLKW	F_SETLKW64 /* Set record locking info (blocking).  */
  #endif
  #define F_GETLK64	12	/* Get record locking info.  */
  #define F_SETLK64	13	/* Set record locking info (non-blocking).  */
  #define F_SETLKW64	14	/* Set record locking info (blocking).	*/
  
  #if defined __USE_BSD || defined __USE_XOPEN2K
  # define F_SETOWN	8	/* Get owner of socket (receiver of SIGIO).  */
  # define F_GETOWN	9	/* Set owner of socket (receiver of SIGIO).  */
  #endif
  
  #ifdef __USE_GNU
  # define F_SETSIG	10	/* Set number of signal to be sent.  */
  # define F_GETSIG	11	/* Get number of signal to be sent.  */
  #endif
  
  #ifdef __USE_GNU
  # define F_SETLEASE	1024	/* Set a lease.	 */
  # define F_GETLEASE	1025	/* Enquire what lease is active.  */
  # define F_NOTIFY	1026	/* Request notfications on a directory.	 */
  # define F_DUPFD_CLOEXEC 1030	/* Duplicate file descriptor with
  				   close-on-exit set on new fd.  */
  # define F_SETPIPE_SZ	1031	/* Set of pipe page size array */
  # define F_GETPIPE_SZ	1032	/* Get of pipe page size array */
  #endif
  
  /* For F_[GET|SET]FL.  */
  #define FD_CLOEXEC	1	/* actually anything with low bit set goes */
  
  /* For posix fcntl() and `l_type' field of a `struct flock' for lockf().  */
  #define F_RDLCK		0	/* Read lock.  */
  #define F_WRLCK		1	/* Write lock.	*/
  #define F_UNLCK		2	/* Remove lock.	 */
  
  /* For old implementation of bsd flock().  */
  #define F_EXLCK		4	/* or 3 */
  #define F_SHLCK		8	/* or 4 */
  
  #ifdef __USE_BSD
  /* Operations for bsd flock(), also used by the kernel implementation.	*/
  # define LOCK_SH	1	/* shared lock */
  # define LOCK_EX	2	/* exclusive lock */
  # define LOCK_NB	4	/* or'd with one of the above to prevent
  				   blocking */
  # define LOCK_UN	8	/* remove lock */
  #endif
  
  #ifdef __USE_GNU
  # define LOCK_MAND	32	/* This is a mandatory flock:	*/
  # define LOCK_READ	64	/* ... which allows concurrent read operations.	 */
  # define LOCK_WRITE	128	/* ... which allows concurrent write operations.  */
  # define LOCK_RW	192	/* ... Which allows concurrent read & write operations.	 */
  #endif
  
  #ifdef __USE_GNU
  /* Types of directory notifications that may be requested with F_NOTIFY.  */
  # define DN_ACCESS	0x00000001	/* File accessed.  */
  # define DN_MODIFY	0x00000002	/* File modified.  */
  # define DN_CREATE	0x00000004	/* File created.  */
  # define DN_DELETE	0x00000008	/* File removed.  */
  # define DN_RENAME	0x00000010	/* File renamed.  */
  # define DN_ATTRIB	0x00000020	/* File changed attibutes.  */
  # define DN_MULTISHOT	0x80000000	/* Don't remove notifier.  */
  #endif
  
  struct flock
    {
      short int l_type;	/* Type of lock: F_RDLCK, F_WRLCK, or F_UNLCK.	*/
      short int l_whence;	/* Where `l_start' is relative to (like `lseek').  */
  #ifndef __USE_FILE_OFFSET64
      __off_t l_start;	/* Offset where the lock begins.  */
      __off_t l_len;	/* Size of the locked area; zero means until EOF.  */
  #else
      __off64_t l_start;	/* Offset where the lock begins.  */
      __off64_t l_len;	/* Size of the locked area; zero means until EOF.  */
  #endif
      __pid_t l_pid;	/* Process holding the lock.  */
    };
  
  #ifdef __USE_LARGEFILE64
  struct flock64
    {
      short int l_type;	/* Type of lock: F_RDLCK, F_WRLCK, or F_UNLCK.	*/
      short int l_whence;	/* Where `l_start' is relative to (like `lseek').  */
      __off64_t l_start;	/* Offset where the lock begins.  */
      __off64_t l_len;	/* Size of the locked area; zero means until EOF.  */
      __pid_t l_pid;	/* Process holding the lock.  */
    };
  #endif
  
  /* Define some more compatibility macros to be backward compatible with
     BSD systems which did not managed to hide these kernel macros.  */
  #ifdef	__USE_BSD
  # define FAPPEND	O_APPEND
  # define FFSYNC		O_FSYNC
  # define FASYNC		O_ASYNC
  # define FNONBLOCK	O_NONBLOCK
  # define FNDELAY	O_NDELAY
  #endif /* Use BSD.  */
  
  /* Advise to `posix_fadvise'.  */
  #ifdef __USE_XOPEN2K
  # define POSIX_FADV_NORMAL	0 /* No further special treatment.  */
  # define POSIX_FADV_RANDOM	1 /* Expect random page references.  */
  # define POSIX_FADV_SEQUENTIAL	2 /* Expect sequential page references.	 */
  # define POSIX_FADV_WILLNEED	3 /* Will need these pages.  */
  # define POSIX_FADV_DONTNEED	4 /* Don't need these pages.  */
  # define POSIX_FADV_NOREUSE	5 /* Data will be accessed once.  */
  #endif
  
  
  #if defined __USE_GNU && defined __UCLIBC_LINUX_SPECIFIC__
  /* Flags for SYNC_FILE_RANGE.  */
  # define SYNC_FILE_RANGE_WAIT_BEFORE	1 /* Wait upon writeout of all pages
  					     in the range before performing the
  					     write.  */
  # define SYNC_FILE_RANGE_WRITE		2 /* Initiate writeout of all those
  					     dirty pages in the range which are
  					     not presently under writeback.  */
  # define SYNC_FILE_RANGE_WAIT_AFTER	4 /* Wait upon writeout of all pages in
  					     the range after performing the
  					     write.  */
  
  /* Flags for SPLICE and VMSPLICE.  */
  # define SPLICE_F_MOVE		1	/* Move pages instead of copying.  */
  # define SPLICE_F_NONBLOCK	2	/* Don't block on the pipe splicing
  					   (but we may still block on the fd
  					   we splice from/to).  */
  # define SPLICE_F_MORE		4	/* Expect more data.  */
  # define SPLICE_F_GIFT		8	/* Pages passed in are a gift.  */
  #endif
  
  __BEGIN_DECLS
  
  #if defined __USE_GNU && defined __UCLIBC_LINUX_SPECIFIC__
  
  /* Provide kernel hint to read ahead.  */
  extern ssize_t readahead (int __fd, __off64_t __offset, size_t __count)
      __THROW;
  
  
  /* Selective file content synch'ing.  */
  extern int sync_file_range (int __fd, __off64_t __from, __off64_t __to,
  			    unsigned int __flags);
  
  /* Splice address range into a pipe.  */
  extern ssize_t vmsplice (int __fdout, const struct iovec *__iov,
  			 size_t __count, unsigned int __flags);
  
  /* Splice two files together.  */
  extern ssize_t splice (int __fdin, __off64_t *__offin, int __fdout,
  		       __off64_t *__offout, size_t __len,
  		       unsigned int __flags);
  
  /* In-kernel implementation of tee for pipe buffers.  */
  extern ssize_t tee (int __fdin, int __fdout, size_t __len,
  		    unsigned int __flags);
  
  #endif
  __END_DECLS
  
  