include/linux/inotify.h

   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  */
  20 struct 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>
  75 extern 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 */