If I use the example program at http://blogs.sun.com/praks/entry/file_events_notification on /proc, it gets errno 48 (ENOTSUP). This is _not_ helpful (unless there's a better way to be notified of process creation/termination than monitoring /proc for changes); without FEN, it would take a loop that sleeps and stats (or fstat()s) /proc. Spinning like that wastes CPU.
Seen on snv_97, running on a Sun Blade 2000. (Someone had asked in another thread about whether Linux preload had been ported to Solaris. Apparently, it works by monitoring their /proc to discover executables and their libraries, and tries to preload up to a certain amount of some selected by means I haven't examined yet, so that the affected apps will start faster. I've had a trivial preloader of my own, but it doesn't discover anything, it just operates on a list of pathnames it's given. Trying to make a smarter one that usually just does the right thing probably would mean watching process creation and termination, and I'd prefer if there were an efficient way to do that.) Even if /proc might never support FEN on all the different objects within /proc (I can see how that might get complicated and/or have performance issues), couldn't it at least support it on the top-level directory? And one more strange question: are the timestamps in file_obj argument updated when the event is delivered? That would make re-associating on the same file more efficient (no need to stat() the file again). -- This message posted from opensolaris.org
