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NAME | LIBRARY | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | STANDARDS | HISTORY | EXAMPLES | SEE ALSO | COLOPHON |
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inotify_add_watch(2) System Calls Manual inotify_add_watch(2)
inotify_add_watch - add a watch to an initialized inotify
instance
Standard C library (libc, -lc)
#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 a unique watch
descriptor for this inotify instance, for the filesystem object
(inode) that corresponds to pathname. If the filesystem object
was not previously being watched by this inotify instance, then
the watch descriptor is newly allocated. If the filesystem
object was already being watched (perhaps via a different link to
the same object), 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 inotify(7)) indicating filesystem events; the
watch descriptor inside this structure identifies the object for
which the event occurred.
On success, inotify_add_watch() returns a watch descriptor (a
nonnegative integer). On error, -1 is returned and errno is set
to indicate the error.
EACCES Read access to the given file is not permitted.
EBADF The given file descriptor is not valid.
EEXIST mask contains IN_MASK_CREATE and pathname refers to a file
already being watched by the same fd.
EFAULT pathname points outside of the process's accessible
address space.
EINVAL The given event mask contains no valid events; or mask
contains both IN_MASK_ADD and IN_MASK_CREATE; or fd is not
an inotify file descriptor.
ENAMETOOLONG
pathname is too long.
ENOENT A directory component in pathname does not exist or is a
dangling 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.
ENOTDIR
mask contains IN_ONLYDIR and pathname is not a directory.
Linux.
Linux 2.6.13.
See inotify(7).
inotify_init(2), inotify_rm_watch(2), inotify(7)
This page is part of the man-pages (Linux kernel and C library
user-space interface documentation) project. Information about
the project can be found at
⟨https://www.kernel.org/doc/man-pages/⟩. If you have a bug report
for this manual page, see
⟨https://git.kernel.org/pub/scm/docs/man-pages/man-pages.git/tree/CONTRIBUTING⟩.
This page was obtained from the tarball man-pages-6.9.1.tar.gz
fetched from
⟨https://mirrors.edge.kernel.org/pub/linux/docs/man-pages/⟩ on
2024-06-26. If you discover any rendering problems in this HTML
version of the page, or you believe there is a better or more up-
to-date source for the page, or you have corrections or
improvements to the information in this COLOPHON (which is not
part of the original manual page), send a mail to
man-pages@man7.org
Linux man-pages 6.9.1 2024-05-02 inotify_add_watch(2)
Pages that refer to this page: inotify_init(2), inotify_rm_watch(2), syscalls(2), inotify(7)
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HTML rendering created 2024-06-26 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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