#ifndef _FCNTL_H
# error "Never use <bits/fcntl.h> directly; include <fcntl.h> instead."
#endif

#include <sys/types.h>

/*
 * open/fcntl - O_SYNC is only implemented on blocks devices and on files
 * located on an ext2 file system
 */
#define O_ACCMODE      00000003
#define O_RDONLY       00000000
#define O_WRONLY       00000001
#define O_RDWR         00000002
#define O_CREAT                00000100        /* not fcntl */
#define O_EXCL         00000200        /* not fcntl */
#define O_NOCTTY       00000400        /* not fcntl */
#define O_TRUNC                00001000        /* not fcntl */
#define O_APPEND       00002000
#define O_NONBLOCK     00004000
#define O_NDELAY       O_NONBLOCK
#define O_SYNC         00010000
#define O_ASYNC                00020000

#ifdef __USE_GNU
# define O_DIRECT      00040000        /* must be a directory */
# define O_DIRECTORY   00200000        /* direct disk access */
# define O_NOFOLLOW    00400000        /* don't follow links */
# define O_NOATIME     01000000        /* don't set atime */
#endif

#ifdef __USE_LARGEFILE64
# define O_LARGEFILE   00100000
#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

#define F_DUPFD                0       /* dup */
#define F_GETFD                1       /* get close_on_exec */
#define F_SETFD                2       /* set/clear close_on_exec */
#define F_GETFL                3       /* get file->f_flags */
#define F_SETFL                4       /* set file->f_flags */

#ifndef __USE_FILE_OFFSET64
# define F_GETLK       5
# define F_SETLK       6
# define F_SETLKW      7
#else
# define F_GETLK       F_GETLK64
# define F_SETLK       F_SETLK64
# define F_SETLKW      F_SETLKW64
#endif
#define F_GETLK64      12      /*  using 'struct flock64' */
#define F_SETLK64      13
#define F_SETLKW64     14

#if defined __USE_BSD || defined __USE_XOPEN2K
# define F_SETOWN      8       /*  for sockets. */
# define F_GETOWN      9       /*  for sockets. */
#endif

#ifdef __USE_GNU
# define F_SETSIG      10      /*  for sockets. */
# define F_GETSIG      11      /*  for sockets. */
#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.  */
#endif

/* for F_[GET|SET]FL */
#define FD_CLOEXEC     1       /* actually anything with low bit set goes */

/* for posix fcntl() and lockf() */
#define F_RDLCK                0
#define F_WRLCK                1
#define F_UNLCK                2

/* for old implementation of bsd flock () */
#define F_EXLCK                4       /* or 3 */
#define F_SHLCK                8       /* or 4 */

/* for leases */
#define F_INPROGRESS   16

#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 ops */
#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           l_type;
       short           l_whence;
#ifndef __USE_FILE_OFFSET64
       __off_t         l_start;
       __off_t         l_len;
#else
       __off64_t       l_start;
       __off64_t       l_len;
#endif
       __pid_t         l_pid;
};

#ifdef __USE_LARGEFILE64
struct flock64 {
       short           l_type;
       short           l_whence;
       __off64_t       l_start;
       __off64_t       l_len;
       __pid_t         l_pid;
};
#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