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