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Re: [BUG] Bash not reacting to Ctrl-C


From: Chet Ramey
Subject: Re: [BUG] Bash not reacting to Ctrl-C
Date: Mon, 07 Mar 2011 20:01:27 -0500
User-agent: Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.6; en-US; rv:1.9.2.13) Gecko/20101207 Lightning/1.0b2 Thunderbird/3.1.7

On 3/7/11 11:52 AM, Linus Torvalds wrote:
> On Mon, Mar 7, 2011 at 8:24 AM, Linus Torvalds
> <address@hidden> wrote:
>>
>> and I think one reason why the race is hard to get rid of is simply
>> that system call return is _the_ common point of signal handling in
>> UNIX (technically, obviously any return to user space, but there are
>> no appreciable interrupts etc going on, and there _are_ a lot of
>> system calls). The above trace is one that my patch would have handled
>> correctly (it has no EINTR).
> 
> Linux also ends up making this race easier to see probably because all
> system calls that are interruptible by signals are all "greedy": they
> try to do as much real work as possible, rather than return EINTR.

Yes, the BSDs have traditionally behaved this way as well.  I just had
a much harder time reproducing this on FreeBSD-derived Mac OS X.

Chet

-- 
``The lyf so short, the craft so long to lerne.'' - Chaucer
                 ``Ars longa, vita brevis'' - Hippocrates
Chet Ramey, ITS, CWRU    address@hidden    http://cnswww.cns.cwru.edu/~chet/



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