2006-02-08 04:13:22 +00:00
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.\" man2/inotify_add_watch.2 - inotify_add_watch man page
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.\"
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2006-02-15 23:19:08 +00:00
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.\" Copyright (C) 2005 Robert Love
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.\" and Copyright, 2006 Michael Kerrisk
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2006-02-08 04:13:22 +00:00
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.\"
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.\" This is free documentation; you can redistribute it and/or
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.\" modify it under the terms of the GNU General Public License as
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.\" published by the Free Software Foundation; either version 2 of
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.\" the License, or (at your option) any later version.
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.\"
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.\" The GNU General Public License's references to "object code"
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.\" and "executables" are to be interpreted as the output of any
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.\" document formatting or typesetting system, including
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.\" intermediate and printed output.
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.\"
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.\" This manual is distributed in the hope that it will be useful,
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.\" but WITHOUT ANY WARRANTY; without even the implied warranty of
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.\" MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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.\" GNU General Public License for more details.
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.\"
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.\" You should have received a copy of the GNU General Public
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.\" License along with this manual; if not, write to the Free
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.\" Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111,
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.\" USA.
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.\"
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.\" 2005-07-19 Robert Love <rlove@rlove.org> - initial version
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.\" 2006-02-07 mtk, various changes
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.\"
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.TH INOTIFY_ADD_WATCH 2 2006-02-07 "Linux" "Linux Programmer's Manual"
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.SH NAME
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inotify_add_watch \- add a watch to an initialized inotify instance
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.SH SYNOPSIS
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2006-06-02 19:43:30 +00:00
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.B #include <sys/inotify.h>
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.sp
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.BI "int inotify_add_watch(int " fd ", const char *" path ", uint32_t " mask );
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.SH DESCRIPTION
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.BR inotify_add_watch ()
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adds a watch on the file at pathname
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.I path
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to the inotify instance mapped by the file descriptor
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.I fd
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with the event mask given by the bitmask
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.IR mask .
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See
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.BR inotify (7)
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for a description of the bits that can be set in
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.IR mask .
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A successful call to
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.BR inotify_add_watch ()
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returns the unique watch descriptor associated with
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.I path
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for this inotify instance.
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If
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.I path
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was not previously being watched by this inotify instance,
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2006-02-12 01:54:40 +00:00
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then the watch descriptor is newly allocated.
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If
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.I path
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was already being watched, then the descriptor
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for the existing watch is returned.
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The watch descriptor is returned by later
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.BR read (2)s
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from the inotify file descriptor.
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These reads fetch
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.I inotify_event
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structures indicating file system events;
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the returned watch descriptor identifies
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the object for which the event occurred.
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.SH "RETURN VALUE"
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On success,
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.BR inotify_add_watch ()
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returns a non-negative watch descriptor.
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On error \-1 is returned and
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.I errno
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is set appropriately.
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.SH ERRORS
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.TP
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.B EACCESS
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Read access to the given file is not permitted.
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.TP
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.B EBADF
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The given file descriptor is not valid.
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.TP
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.B EFAULT
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.I path
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points outside of the process's accessible address space.
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.TP
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.B EINVAL
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The given event mask contains no legal events.
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.TP
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.B ENOMEM
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Insufficient kernel memory was available.
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.TP
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.B ENOSPC
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The user limit on the total number of inotify watches was reached or the
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kernel failed to allocate a needed resource.
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.SH "HISTORY"
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Inotify was merged into the 2.6.13 Linux kernel.
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.SH "CONFORMING TO"
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This system call is Linux specific.
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.SH "BUGS"
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In kernels before 2.6.16, the
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.B IN_ONESHOT
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.I mask
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flag does not work.
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.SH "SEE ALSO"
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.BR inotify_init (2),
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.BR inotify_rm_watch (2),
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.BR inotify (7).
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