inotify_add_watch — add a watch to an initialized inotify instance
#include <sys/inotify.h>
int
inotify_add_watch( |
int | fd, |
| const char * | pathname, | |
| uint32_t | mask); |
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
mask bit-mask
argument. See inotify(7) for a
description of the bits that can be set in mask.
A successful call to inotify_add_watch() returns the unique
watch descriptor associated with pathname for this inotify
instance. If pathname
was not previously being watched by this inotify instance,
then the watch descriptor is newly allocated. If pathname was already being
watched, 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
inotify(7))
indicating file system events; the watch descriptor inside
this structure identifies the object for which the event
occurred.
On success, inotify_add_watch() returns a non-negative
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.
pathname
points outside of the process's accessible address
space.
The given event mask contains no legal events; or
fd is not an
inotify file descriptor.
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.
This page is part of release 2.79 of the Linux man-pages project. A
description of the project, and information about reporting
bugs, can be found at
http://www.kernel.org/doc/man-pages/.
|
man2/inotify_add_watch.2 - inotify_add_watch man page 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. The GNU General Public License's references to "object code" and "executables" are to be interpreted as the output of any document formatting or typesetting system, including intermediate and printed output. This manual is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this manual; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111, USA. 2005-07-19 Robert Love <rloverlove.org> - initial version 2006-02-07 mtk, various changes |