Re: UNIX signals
Re: UNIX signals
- Subject: Re: UNIX signals
- From: Keary Suska <email@hidden>
- Date: Wed, 17 Dec 2008 09:20:32 -0700
On Dec 16, 2008, at 8:27 PM, Jonathan Prescott wrote:
For everything else other than Cocoa and Carbon applications that
receive AppleEvents, when the computer is shutdown, everything else
is sent a SIGKILL by launchd, just like any other Unix system
(launchd takes the place of the init daemon seen on other Unix
systems). Semantics for BSD signals are described in the man pages
(kill, signal, etc.). SIGINT is like hitting Ctrl-C at the
terminal to stop a shell process. Processes can ignore a Ctrl-C.
SIGKILL is non-ignorable.
For the record, this is incorrect. Each process is sent a SIGQUIT. It
would be extremely bad for launchd to send a SIGKILL as a matter of
course. You might as well just shut your computer down by turning off
the power, if that was the case.
Best,
Keary Suska
Esoteritech, Inc.
"Demystifying technology for your home or business"
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