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Re: comments on the Quit command

email@hidden wrote:

>In case you (or someone else on the list) doesn't know, "Force Quit" works
>by sending a Unix signal (SIGTERM, I believe), so the two (on OS X, at
>least) are really the same thing.

SIGKILL (value 9) is the Force-Quit signal. It's the only one that's
unignorable and uncatchable.

Force-Quit may send a SIGTERM (or SIGQUIT or SIGINT) first and see if it
terminates, followed by a SIGKILL only if the target process is especially
stubborn. I'm not sure about this, but escalating signals seems reasonable
to me.

When I wrote the signal-handling in Easy Posix Toolkit, I did a fair amount
of research into ANSI C signals, Posiz signals, BSD signals, and even NT
signals. There's a lot of allowable variation, a lot of hand-waving, and
it's a real PITA to figure out lots of things. A lot of what I discovered
is summarized in the doc-comments for the SignalNames interface in the Easy
Posix Toolkit.

-- GG
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