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Subject: Re: Ctrl-Break killing subprocess even though handled in parent process
References: <006701d2cbcd$444459b0$cccd0d10$@gmail.com>
To: cygwin AT cygwin DOT com
From: Brian Inglis <Brian DOT Inglis AT SystematicSw DOT ab DOT ca>
Reply-To: Brian DOT Inglis AT SystematicSw DOT ab DOT ca
Message-ID: <481e7869-941e-0b32-cc9d-7ae17726d05a@SystematicSw.ab.ca>
Date: Sat, 13 May 2017 10:29:22 -0600
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On 2017-05-13 03:42, Brien Oberstein wrote:
> I have a dotnet windows console application that runs a bash script
> as a subprocess using CreateProcess() under the covers.
> My windows app traps Ctrl-Break via SetConsoleCtrlHandler() and
> handles it (returning true from the handler).
> I execute the script via the command "bash.exe --login script.sh".
> Somehow the Ctrl-Break is reaching the subprocess and causing it to
> be killed, which is undesireable.
> Is there a way to either prevent the Ctrl-Break from reaching the
> cygwin subprocess or telling cygwin/bash to ignore it?

Add to top of script: 
trap '' SIGINT SIGTERM
does equivalent of SIG_IGN (do nothing) on named signals. 

$ info bash trap
or
$ help trap
in bash gives you more info. 

Watch out for subshells, as signals are reset in subshells, 
so you will need to set up the trap in all subshells.

-- 
Take care. Thanks, Brian Inglis, Calgary, Alberta, Canada

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