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Re: [PATCH 5/5] evalstring: drop volatile on sigset


From: Chet Ramey
Subject: Re: [PATCH 5/5] evalstring: drop volatile on sigset
Date: Thu, 11 Aug 2016 11:45:58 -0400
User-agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.11; rv:45.0) Gecko/20100101 Thunderbird/45.2.0

On 8/11/16 8:30 AM, Mike Frysinger wrote:
> These variables are located on the stack and are never read/written
> directly by bash.  Instead, they're all accessed indirectly via the
> POSIX signal API.  Since POSIX does not require volatile, and bash
> itself doesn't require volatile, drop the volatile markings.  If we
> don't, you get a lot of warnings at build time as the POSIX API does
> not declare the prototypes with a volatile type.

I want the values usable across a potential longjmp() regardless of what
the compiler does and regardless of the underlying sigset_t type.  ISO C
says the value is technically undefined after a longjmp, however unlikely
it is that it will be modified.  volatile is the easiest way to accomplish
that.

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



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