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
indicating file system events; the returned watch descriptor
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.
inotify_init(2), inotify_rm_watch(2), inotify(7).
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