monitorDirectory
Obtains a directory monitor for the given file. This may fail if directory monitoring is not supported.
If @cancellable is not null, then the operation can be cancelled by triggering the cancellable object from another thread. If the operation was cancelled, the error %G_IO_ERROR_CANCELLED will be returned.
It does not make sense for @flags to contain %G_FILE_MONITOR_WATCH_HARD_LINKS, since hard links can not be made to directories. It is not possible to monitor all the files in a directory for changes made via hard links; if you want to do this then you must register individual watches with g_file_monitor().
Return
a #GFileMonitor for the given @file, or null on error. Free the returned object with g_object_unref().
Parameters
a set of #GFileMonitorFlags
optional #GCancellable object, null to ignore