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INOTIFY_ADD_WATCH(2)       Linux Programmer's Manual      INOTIFY_ADD_WATCH(2)



NAME
       inotify_add_watch - add a watch to an initialized inotify instance

SYNOPSIS
       #include <sys/inotify.h>

       int inotify_add_watch(int fd, const char *pathname, uint32_t mask);

DESCRIPTION
       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  refer-
       ring  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  ino-
       tify_event  structures  (see inotify(7)) indicating file system events; the watch descriptor inside this struc-
       ture identifies the object for which the event occurred.

RETURN VALUE
       On success, inotify_add_watch() returns a non-negative watch descriptor.  On error -1 is returned and errno  is
       set appropriately.

ERRORS
       EACCES Read access to the given file is not permitted.

       EBADF  The given file descriptor is not valid.

       EFAULT pathname points outside of the process's accessible address space.

       EINVAL The given event mask contains no valid events; or fd is not an inotify file descriptor.

       ENOMEM Insufficient kernel memory was available.

       ENOSPC 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.

SEE ALSO
       inotify_init(2), inotify_rm_watch(2), inotify(7)

COLOPHON
       This page is part of release 3.22 of the Linux man-pages project.  A description of the project,  and  informa-
       tion about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/.



Linux                             2006-02-07              INOTIFY_ADD_WATCH(2)