inotify_add_watch — add a watch to an initialized inotify instance
|const char *pathname,|
inotify_add_watch() adds a
new watch, or modifies an existing watch, for the file whose
location is specified in
pathname; the caller must have
read permission for this file. The
fd argument is a file
descriptor referring to the inotify instance whose watch list
is to be modified. The events to be monitored for
pathname are specified in the
argument. See inotify(7) for a
description of the bits that can be set in
A successful call to
inotify_add_watch() returns a unique watch
descriptor for this inotify instance, for the filesystem
object that corresponds to
pathname. If the filesystem
object was not previously being watched by this inotify
instance, then the watch descriptor is newly allocated. If
the filesystem object was already being watched (perhaps via
a different link to the same object), then the descriptor for
the existing watch is returned.
The watch descriptor is returned by later read(2)s from the inotify
file descriptor. These reads fetch
inotify_event structures (see
filesystem events; the watch descriptor inside this structure
identifies the object for which the event occurred.
inotify_add_watch() returns a nonnegative
watch descriptor. On error, −1 is returned and
errno is set appropriately.
Read access to the given file is not permitted.
The given file descriptor is not valid.
points outside of the process's accessible address
The given event mask contains no valid events; or
fd is not an
inotify file descriptor.
A directory component in
pathname does not exist
or is a dangling symbolic link.
Insufficient kernel memory was available.
The user limit on the total number of inotify watches was reached or the kernel failed to allocate a needed resource.
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Copyright (C) 2005 Robert Love
and Copyright, 2006 Michael Kerrisk
This is free documentation; you can redistribute it and/or
modify it under the terms of the GNU General Public License as
published by the Free Software Foundation; either version 2 of
the License, or (at your option) any later version.
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You should have received a copy of the GNU General Public
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2005-07-19 Robert Love <rloverlove.org> - initial version
2006-02-07 mtk, various changes