/*
   * Inode based directory notification for Linux
   *
   * Copyright (C) 2005 John McCutchan
   */
  
  #ifndef _LINUX_INOTIFY_H
  #define _LINUX_INOTIFY_H

  /* For O_CLOEXEC and O_NONBLOCK */

  #include <linux/fcntl.h>

  #include <linux/types.h>
  
  /*
   * struct inotify_event - structure read from the inotify device for each event
   *
   * When you are watching a directory, you will receive the filename for events
   * such as IN_CREATE, IN_DELETE, IN_OPEN, IN_CLOSE, ..., relative to the wd.
   */
  struct inotify_event {
  	__s32		wd;		/* watch descriptor */
  	__u32		mask;		/* watch mask */
  	__u32		cookie;		/* cookie to synchronize two events */
  	__u32		len;		/* length (including nulls) of name */
  	char		name[0];	/* stub for possible name */
  };
  
  /* the following are legal, implemented events that user-space can watch for */
  #define IN_ACCESS		0x00000001	/* File was accessed */
  #define IN_MODIFY		0x00000002	/* File was modified */
  #define IN_ATTRIB		0x00000004	/* Metadata changed */
  #define IN_CLOSE_WRITE		0x00000008	/* Writtable file was closed */
  #define IN_CLOSE_NOWRITE	0x00000010	/* Unwrittable file closed */
  #define IN_OPEN			0x00000020	/* File was opened */
  #define IN_MOVED_FROM		0x00000040	/* File was moved from X */
  #define IN_MOVED_TO		0x00000080	/* File was moved to Y */
  #define IN_CREATE		0x00000100	/* Subfile was created */
  #define IN_DELETE		0x00000200	/* Subfile was deleted */
  #define IN_DELETE_SELF		0x00000400	/* Self was deleted */

  #define IN_MOVE_SELF		0x00000800	/* Self was moved */

  
  /* the following are legal events.  they are sent as needed to any watch */
  #define IN_UNMOUNT		0x00002000	/* Backing fs was unmounted */
  #define IN_Q_OVERFLOW		0x00004000	/* Event queued overflowed */
  #define IN_IGNORED		0x00008000	/* File was ignored */
  
  /* helper events */
  #define IN_CLOSE		(IN_CLOSE_WRITE | IN_CLOSE_NOWRITE) /* close */
  #define IN_MOVE			(IN_MOVED_FROM | IN_MOVED_TO) /* moves */
  
  /* special flags */

  #define IN_ONLYDIR		0x01000000	/* only watch the path if it is a directory */
  #define IN_DONT_FOLLOW		0x02000000	/* don't follow a sym link */

  #define IN_EXCL_UNLINK		0x04000000	/* exclude events on unlinked objects */

  #define IN_MASK_ADD		0x20000000	/* add to the mask of an already existing watch */

  #define IN_ISDIR		0x40000000	/* event occurred against dir */
  #define IN_ONESHOT		0x80000000	/* only send event once */
  
  /*
   * All of the events - we build the list by hand so that we can add flags in
   * the future and not break backward compatibility.  Apps will get only the
   * events that they originally wanted.  Be sure to add new events here!
   */
  #define IN_ALL_EVENTS	(IN_ACCESS | IN_MODIFY | IN_ATTRIB | IN_CLOSE_WRITE | \
  			 IN_CLOSE_NOWRITE | IN_OPEN | IN_MOVED_FROM | \

  			 IN_MOVED_TO | IN_DELETE | IN_CREATE | IN_DELETE_SELF | \
  			 IN_MOVE_SELF)

  /* Flags for sys_inotify_init1.  */
  #define IN_CLOEXEC O_CLOEXEC

  #define IN_NONBLOCK O_NONBLOCK

  #ifdef __KERNEL__
  #include <linux/sysctl.h>
  extern struct ctl_table inotify_table[]; /* for sysctl */

  
  #define ALL_INOTIFY_BITS (IN_ACCESS | IN_MODIFY | IN_ATTRIB | IN_CLOSE_WRITE | \
  			  IN_CLOSE_NOWRITE | IN_OPEN | IN_MOVED_FROM | \
  			  IN_MOVED_TO | IN_CREATE | IN_DELETE | \
  			  IN_DELETE_SELF | IN_MOVE_SELF | IN_UNMOUNT | \
  			  IN_Q_OVERFLOW | IN_IGNORED | IN_ONLYDIR | \
  			  IN_DONT_FOLLOW | IN_EXCL_UNLINK | IN_MASK_ADD | \
  			  IN_ISDIR | IN_ONESHOT)

  #endif

  #endif	/* _LINUX_INOTIFY_H */