Re: [boost] asio formal review begins

From: Jeremy Maitin-Shepard (jbms_at_[hidden])
Date: 2005-12-13 01:52:20

<Oliver.Kowalke_at_[hidden]> writes:

>> Hi Jeremy,
>> Unfortunately this flag doesn't seem to be available on Solaris, which
>> does raise SIGPIPE too. It also doesn't work with writev.

> I use this code:

> ...
> 	sig::action sa;
> 	sa.set_handler( SIG_IGN);
> 	sig::action old_sa( sa.run( SIGPIPE) );
> 	boost::shared_ptr< void > guard(
> 		static_cast< void * >( 0),
> 		boost::bind(
> 			& sig::action::run,
> 			old_sa, 
> 			SIGPIPE) );

> 	::write(...)

> ...

> sig:action abstracts struct sigaction, clib function ::sigaction and so
> on.

> After sa.run( SIGPIPE) the signal is ignored and write would return
> EPIPE. The shared_ptr resets the original signal handler after getting
> out of scope.

As I mentioned in another message, at least on Linux, sendmsg can be
used as replacement for writev that allows specification of
MSG_NOSIGNAL.  Your code might potentially be useful on Solaris and
other platforms that do not support disabling the signal through
mechanism like MSG_NOSIGNAL, although your code seems to introduce quite
a lot of overhead per write call.

-- 
Jeremy Maitin-Shepard