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Sender: cygwin-owner AT cygwin DOT com
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From: "Brien Oberstein" <brienpub AT gmail DOT com>
To: <Brian DOT Inglis AT SystematicSw DOT ab DOT ca>, <cygwin AT cygwin DOT com>
References: <481e7869-941e-0b32-cc9d-7ae17726d05a AT SystematicSw DOT ab DOT ca>
In-Reply-To: <481e7869-941e-0b32-cc9d-7ae17726d05a@SystematicSw.ab.ca>
Subject: RE: Ctrl-Break killing subprocess even though handled in parent process
Date: Sun, 14 May 2017 09:43:05 -0400
Message-ID: <000501d2ccb8$04250730$0c6f1590$@gmail.com>
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Hi Brian,

You know, I thought I tried this already, but somehow now its working.

Thanks!

-----Original Message-----
From: Brian Inglis [mailto:Brian DOT Inglis AT SystematicSw DOT ab DOT ca] 
Sent: Saturday, May 13, 2017 12:29 PM
To: cygwin AT cygwin DOT com
Subject: Re: Ctrl-Break killing subprocess even though handled in parent process

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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