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Date: Fri, 15 Jan 2010 18:22:13 -0500
From: Christopher Faylor <cgf-use-the-mailinglist-please AT cygwin DOT com>
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Subject: Re: 1.7.1: terminal not passing Ctrl-C to sub-sub cygwin processes
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On Fri, Jan 15, 2010 at 05:00:37PM -0500, Rolf Campbell wrote:
> From within cygwin python, if I call os.system running a cygwin 
>sub-process, and I hit Ctrl-C while that cygwin sub-process is running, 
>the Ctrl-C does nothing (absolutely nothing -- nothing is printed, 
>nothing terminates, no sound is made -- it's as if I didn't press the 
>key at all).
>
>I've attached a simple script which easily reproduces the situation. 
>When I run the script as "./ctrlc.py 0", Ctrl-C kill the process, but 
>when I run it with an argument of 1 or more, hitting Ctrl-C has no effect.
>
>I have not testing this with anything other than python, but I have a 
>feeling that it's not python related.

It probably isn't.  From the linux man page:

  NAME
	 system - execute a shell command

  SYNOPSIS
	 #include <stdlib.h>

	 int system(const char *command);

  DESCRIPTION
	  system() executes a command specified in command by calling /bin/sh -c
	  command, and returns after the command has been completed.  During
	  execution of the command, SIGCHLD will be blocked, and SIGINT and
	  SIGQUIT will be ignored.

cgf

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