Date: Wed, 10 Feb 1999 17:32:04 -0500 (EST) From: perlsta <bright@cygnus.rush.net> To: Dag-Erling Smorgrav <des@flood.ping.uio.no> Cc: "Daniel C. Sobral" <dcs@newsguy.com>, Matthew Dillon <dillon@apollo.backplane.com>, Christoph Kukulies <kuku@gilberto.physik.RWTH-Aachen.DE>, Peter Wemm <peter@netplex.com.au>, Terry Lambert <tlambert@primenet.com>, hackers@FreeBSD.ORG Subject: Re: portability of shm, mmap, pipes and socket IPC Message-ID: <Pine.BSF.3.96.990210172803.10060O-100000@cygnus.rush.net> In-Reply-To: <xzpww1q9u9r.fsf@flood.ping.uio.no>
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On 10 Feb 1999, Dag-Erling Smorgrav wrote: > "Daniel C. Sobral" <dcs@newsguy.com> writes: > > Dag-Erling Smorgrav wrote: > > > Matthew Dillon <dillon@apollo.backplane.com> writes: > > > > The problem is that linux updates the timeval structure on return, > > > > telling you how much time is left. > > > Yup. I wish FreeBSD did that - the man page already states that one > > > shouldn't rely on tv not being modified, so it shouldn't break POLA. > > Manual pages aren't POLA. They are specs. Traditional usage is POLA. > > Wanna different different behavior? Create a different function. > > Yep, man pages are specs, and when the spec says tv may be modified by > select(), that means you can't expect it to remain untouched. > > > Besides, given that most usages have no need for this, it would be a > > wast of space and time. > > On the contrary, it is extremely useful for implementing higher-level > timeouts. If you want to see the new installer come true, I need to > implement protocol-level timeouts in libfetch, and that means either > add a lot of gettimeofday() logic or fix select() to modify tv. I wish select() did mess with the tv struct, it would have made a lot of code i did recently easier, and faster with less syscalls. However if you impelemnt the change now, i fear that my code will break. (actually i'm quite sure i reinit the tv just to be safe) My suggestion? select2() which offers the same functionality, however DOES mess with tv. Leave select() alone. :) thanks, -Alfred > > DES > -- > Dag-Erling Smorgrav - des@flood.ping.uio.no To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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