[PATCH v2] Allow -q to be repeated for very quiet output

[Daniel P. Berrange]

On Fri, May 17, 2013 at 10:13:46AM +0200, Denys Vlasenko wrote:
> On 05/13/2013 12:30 PM, Daniel P. Berrange wrote:
> > From: "Daniel P. Berrange" <berrange at redhat.com>
> > 
> > Even with the -q flag specified, tracing output is still mixed
> > with messages about signals and process exit status, which is
> > often irrelevant. Allow the -q flag to be repeated to force
> > the suppression of signals / exit status info too.
> 
> I would say that this is a bit arbitrary to think
> that signals are "not relevant". In many cases,
> they are!

If you're interested in signals, don't use this repeated -q
arg to hide them. That's why I made this is a new option, rather
than changing the semantics of the existing single -q arg usage.

> The suppression done by -q was suppressing messages about
> what _strace_ does, those messages had nothing to do with
> _what happens to the traced process_.
> 
> Your new addition suppressed signal delivery log messages,
> and that is something which _does happen to the process_
> being traced.
> 
> Also, your addition is unnecessary because "-e signal=!all"
> does the same thing.

That's rather obscure & verbose compared to just repeating
the -q arg.

Daniel
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