Read file modification

[FITHIS]

hi all,

first of all excuse me for putting an erroneous subject in my previous 
posting.

I was looking at an open source win32 app sumatra.pdf and I noticed that 
they use the cumbersome readdirectory API for detecting a file 
modification (and they also check if the file is still locked for 
writing before refreshing the pdf). After some research for a 
cross-platform way I noticed that a good cross-platform implementation 
is the QFileSystemWatcher. WxWidgets claims some reliability problems. 
Is there something like this in GNUStep? Is there a GNUstep way to 
detect file modification reliably and cross-platform?

Regards
Vasileios