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From: Archie Cobbs <archie@whistle.com>
Message-Id: <199812110654.WAA25455@bubba.whistle.com>
Subject: Re: inetd: realloc/free bug
In-Reply-To: <199812110651.WAA34943@apollo.backplane.com> from Matthew Dillon at "Dec 10, 98 10:51:20 pm"
To: dillon@apollo.backplane.com (Matthew Dillon)
Date: Thu, 10 Dec 1998 22:54:28 -0800 (PST)
Cc: jwd@unx.sas.com, freebsd-current@FreeBSD.ORG
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Matthew Dillon writes:
> :It's not trivial if you want to guarantee that no signals are missed.
> :There's no way atomically to: unblock signals and call select().
>
> If you put a time limit on select(), it doesn't matter if there is a
> race condition there. How does select() cause a signal to be missed ?
Well, sure.. :-) but then you don't service signals in real time
and spend extra cycles timing out all the time.
By the way, from man select(2):
BUGS
select() should probably return the time remaining from the original
timeout, if any, by modifying the time value in place. This may be im-
plemented in future versions of the system. Thus, it is unwise to assume
that the timeout value will be unmodified by the select() call.
Is this ever going to be implemented? I think this warning's been
around for at least 10 years now..
-Archie
___________________________________________________________________________
Archie Cobbs * Whistle Communications, Inc. * http://www.whistle.com
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