|| Linux Programmer's Manual
NAME inotify_add_watch - add a watch to an initialized inotify instance
, const char *
() adds a new watch, or modifies an existing watch, for the file whose location is specified in
; the caller must have read permission for this file. The
argument is a file descriptor referring to the inotify instance whose watch list is to be modified. The events to be monitored for
are specified in the
bit-mask argument. See
(7) for a description of the bits that can be set in
A successful call to
() returns the unique watch descriptor associated with
for this inotify instance. If
was not previously being watched by this inotify instance, then the watch descriptor is newly allocated. If
was already being watched, then the descriptor for the existing watch is returned.
The watch descriptor is returned by later
(2)s from the inotify file descriptor. These reads fetch
(7)) indicating file system events; the watch descriptor inside this structure identifies the object for which the event occurred.
RETURN VALUE On success,
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.
pathname points outside of the process's accessible address space.
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.
VERSIONS Inotify was merged into the 2.6.13 Linux kernel.
CONFORMING TO This system call is Linux-specific.
COLOPHON This page is part of release 3.53 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/.