inotify_add_watch man page on ElementaryOS

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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 descrip‐
       tor referring to the inotify instance whose watch list is to  be	 modi‐
       fied.   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  ino‐
       tify(7)) indicating filesystem 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.

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.

       ENOENT A	 directory  component  in pathname does not exist or is a dan‐
	      gling symbolic link.

       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 3.54 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/.

Linux				  2010-10-20		  INOTIFY_ADD_WATCH(2)
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