linux/include/linux/inotify.h
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   1/*
   2 * Inode based directory notification for Linux
   3 *
   4 * Copyright (C) 2005 John McCutchan
   5 */
   6
   7#ifndef _LINUX_INOTIFY_H
   8#define _LINUX_INOTIFY_H
   9
  10/* For O_CLOEXEC and O_NONBLOCK */
  11#include <linux/fcntl.h>
  12#include <linux/types.h>
  13
  14/*
  15 * struct inotify_event - structure read from the inotify device for each event
  16 *
  17 * When you are watching a directory, you will receive the filename for events
  18 * such as IN_CREATE, IN_DELETE, IN_OPEN, IN_CLOSE, ..., relative to the wd.
  19 */
  20struct inotify_event {
  21        __s32           wd;             /* watch descriptor */
  22        __u32           mask;           /* watch mask */
  23        __u32           cookie;         /* cookie to synchronize two events */
  24        __u32           len;            /* length (including nulls) of name */
  25        char            name[0];        /* stub for possible name */
  26};
  27
  28/* the following are legal, implemented events that user-space can watch for */
  29#define IN_ACCESS               0x00000001      /* File was accessed */
  30#define IN_MODIFY               0x00000002      /* File was modified */
  31#define IN_ATTRIB               0x00000004      /* Metadata changed */
  32#define IN_CLOSE_WRITE          0x00000008      /* Writtable file was closed */
  33#define IN_CLOSE_NOWRITE        0x00000010      /* Unwrittable file closed */
  34#define IN_OPEN                 0x00000020      /* File was opened */
  35#define IN_MOVED_FROM           0x00000040      /* File was moved from X */
  36#define IN_MOVED_TO             0x00000080      /* File was moved to Y */
  37#define IN_CREATE               0x00000100      /* Subfile was created */
  38#define IN_DELETE               0x00000200      /* Subfile was deleted */
  39#define IN_DELETE_SELF          0x00000400      /* Self was deleted */
  40#define IN_MOVE_SELF            0x00000800      /* Self was moved */
  41
  42/* the following are legal events.  they are sent as needed to any watch */
  43#define IN_UNMOUNT              0x00002000      /* Backing fs was unmounted */
  44#define IN_Q_OVERFLOW           0x00004000      /* Event queued overflowed */
  45#define IN_IGNORED              0x00008000      /* File was ignored */
  46
  47/* helper events */
  48#define IN_CLOSE                (IN_CLOSE_WRITE | IN_CLOSE_NOWRITE) /* close */
  49#define IN_MOVE                 (IN_MOVED_FROM | IN_MOVED_TO) /* moves */
  50
  51/* special flags */
  52#define IN_ONLYDIR              0x01000000      /* only watch the path if it is a directory */
  53#define IN_DONT_FOLLOW          0x02000000      /* don't follow a sym link */
  54#define IN_EXCL_UNLINK          0x04000000      /* exclude events on unlinked objects */
  55#define IN_MASK_ADD             0x20000000      /* add to the mask of an already existing watch */
  56#define IN_ISDIR                0x40000000      /* event occurred against dir */
  57#define IN_ONESHOT              0x80000000      /* only send event once */
  58
  59/*
  60 * All of the events - we build the list by hand so that we can add flags in
  61 * the future and not break backward compatibility.  Apps will get only the
  62 * events that they originally wanted.  Be sure to add new events here!
  63 */
  64#define IN_ALL_EVENTS   (IN_ACCESS | IN_MODIFY | IN_ATTRIB | IN_CLOSE_WRITE | \
  65                         IN_CLOSE_NOWRITE | IN_OPEN | IN_MOVED_FROM | \
  66                         IN_MOVED_TO | IN_DELETE | IN_CREATE | IN_DELETE_SELF | \
  67                         IN_MOVE_SELF)
  68
  69/* Flags for sys_inotify_init1.  */
  70#define IN_CLOEXEC O_CLOEXEC
  71#define IN_NONBLOCK O_NONBLOCK
  72
  73#ifdef __KERNEL__
  74#include <linux/sysctl.h>
  75extern struct ctl_table inotify_table[]; /* for sysctl */
  76
  77#define ALL_INOTIFY_BITS (IN_ACCESS | IN_MODIFY | IN_ATTRIB | IN_CLOSE_WRITE | \
  78                          IN_CLOSE_NOWRITE | IN_OPEN | IN_MOVED_FROM | \
  79                          IN_MOVED_TO | IN_CREATE | IN_DELETE | \
  80                          IN_DELETE_SELF | IN_MOVE_SELF | IN_UNMOUNT | \
  81                          IN_Q_OVERFLOW | IN_IGNORED | IN_ONLYDIR | \
  82                          IN_DONT_FOLLOW | IN_EXCL_UNLINK | IN_MASK_ADD | \
  83                          IN_ISDIR | IN_ONESHOT)
  84
  85#endif
  86
  87#endif  /* _LINUX_INOTIFY_H */
  88
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