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Date: Sat, 12 Jan 2013 18:41:27 +0100
From: Thomas Wolff <towo AT towo DOT net>
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Subject: Re: select() not interrupted by signals
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Am 11.01.2013 16:38, schrieb Christopher Faylor:
> On Fri, Jan 11, 2013 at 09:41:37AM +0100, Thomas Wolff wrote:
>> I had previously reported "select() hanging after terminal killed"
>> (http://cygwin.com/ml/cygwin/2011-05/msg00418.html).
>> It turns out that select() does not get interrupted by a SIGWINCH signal
>> either (with likely the same cause).
>> This raises problems with interactive programs that want to react to
>> window size changes (like text editors).
>>
>> See attached updated test case; run the program, while select() is
>> waiting (before 5 second timeout each), change window size and see no
>> interrupt.
> "No interrupt"?  I see a "HUP" but select() keeps going.  That was the
> way I designed it but apparently that differs from the way Linux works.
> select() is not restartable like read() or write().
>
> That behavior should be fixed in the next snapshot.  If you are seeing
> something different than this then that is not fixed.
After Corinna wrote:
> You could test using the binary...
Yes, fixed with latest snapshot, thanks a lot. At least as far as I am 
concerned, i.e.
Not sure what exactly you mean with "select is not restartable" -
actually, that made me test again more deeply, and it seems you 
interrupt select() now on every signal;
as I understood it should only get interrupted on a signal related to a 
file descriptor for which the bit in the exceptfds vector is set...
I'll recheck that on Unix next week.
------
Thomas

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