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int69h · Jan 28, 2003, 09:19 PM

Is it safe to install signal handlers using signal(2) in a Foundation application? I'm writing a daemon and have installed handlers for SIGHUP (to reload config) and SIGTERM (to clean up a file in /var/run).

Also, is it preferable to use daemon() and then close stdin, stdout, and stderr (so NSLog() uses syslog) rather than forking, exiting parent, setting session id, etc.?

--
Terry

int69h · Jan 31, 2003, 05:58 AM

Nobody has written a daemon using Foundation? I'm kind of worried about NSExceptions, longjmp, and the signal handlers not getting along with each other. If nobody knows, I'll post the answer if I ever find one.

smeger · Jan 31, 2003, 02:46 PM

When I ported Chicken of the VNC to OS X, it used signal handlers. I eventually removed them because of a bad interaction with Unsanity's WindowShade X.

They seemed to work fine other than that, though.

But I'm just guessing...

Angus_D · Jan 31, 2003, 05:40 PM

There was some long discussion on this topic some months back on macosx-dev. Might make for interesting reading.

int69h · Jan 31, 2003, 06:32 PM

That thread made for very interesting reading. It opened my eyes to all new ways for my program to die a horrible death. I hadn't thought about Foundation spawning new threads on my behalf. Thanks Foundation.

Maybe I'll have better luck using CoreFoundation. If not, I'll just have to reinvent a few wheels. OO is overrated anyways

Thanks.