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bug#14569: 24.3.50; bootstrap fails on Cygwin

From: Paul Eggert
Subject: bug#14569: 24.3.50; bootstrap fails on Cygwin
Date: Tue, 25 Jun 2013 07:51:23 -0700
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130510 Thunderbird/17.0.6 
On 06/25/2013 06:55 AM, Ken Brown wrote:
> I'm puzzled by the asymmetry between block_child_signal and 
> unblock_child_signal.  The first blocks SIGCHLD, while the second unblocks 
> *all* signals.  Why is this the right thing to do?
> 
> Ken

I didn't write that code, but here's my guess.
Emacs normally runs with all signals unblocked.
Unblocking everything is the right thing to do,
if there's a bug elsewhere in Emacs that inadvertently
leaves signals blocked.
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