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Date: Wed, 23 Dec 2009 09:21:21 -0800
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Subject: Re: [PHP-DEV] ignore_user_abort=true for sapi/cli
From: rasmus@lerdorf.com (Rasmus Lerdorf)

Richard Quadling wrote:
> 2009/12/23 Rasmus Lerdorf <rasmus@lerdorf.com>:
>> Can anyone think of a situation where you actually want our current
>> ignore_user_abort=false setting for the cli sapi?
> 
> I would say that the default setting is pretty important as pressing
> CTRL+C (at least on windows) is the quickest way of killing a PHP cli
> based script without killing the shell/console or loading the task
> manager (or similar), finding the right instance of PHP and then
> killing it.

Again, ignore_user_abort has no effect on signal handling.  A SIGTERM is
going to kill the process regardless of the ignore_user_abort setting.

ignore_user_abort is a simple boolean that guides whether to abort when
PHP is unable to write to whatever output mechanism the sapi uses.  For
cli that would be stdout.  If for some reason your cli script's tty goes
away without the script being terminated then your script will die the
next time it tries to write anything because ignore_user_abort is off by
default.  One situation where this is likely is when you specifically
background and nohup your cli script.  Right now unless you also set
ignore_user_abort to true in your script, it will die on any sort of
output.  There are other cases as well.

-Rasmus