03-19-2013
The best way to monitor filesystem events is incron (a cron-like utility for filesystem events). I have a script that kicks off when something is written to the anonymous ftp jail (using the write-close flag if I recall correctly) to move the files elsewhere. I also have one that handles web page input without using CGI and the security risks that come with it.
inotify - get your file system supervised
Mike
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LEARN ABOUT OPENSOLARIS
inotify_add_watch
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 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 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 descrip-
tor 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 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.
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.
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 4.15 of the Linux man-pages project. A description of the project, information about reporting bugs, and the
latest version of this page, can be found at https://www.kernel.org/doc/man-pages/.
Linux 2017-09-15 INOTIFY_ADD_WATCH(2)