Date: Wed, 15 Mar 2006 09:16:07 -0500 (EST) From: Daniel Eischen <deischen@freebsd.org> To: Sven Berkvens-Matthijsse <sven@ilse.net> Cc: FreeBSD-gnats-submit@freebsd.org, freebsd-threads@freebsd.org Subject: Re: threads/94467: send(), sendto() and sendmsg() are not correct in libc_r Message-ID: <Pine.GSO.4.43.0603150914060.27666-100000@sea.ntplx.net> In-Reply-To: <200603151109.k2FB9pCN037532@serv7.ilse.net>
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On Wed, 15 Mar 2006, Sven Berkvens-Matthijsse wrote: > > >Number: 94467 > >Category: threads > >Synopsis: send(), sendto() and sendmsg() are not correct in libc_r > >Confidential: no > >Severity: serious > >Priority: medium > >Responsible: freebsd-threads > >State: open > >Quarter: > >Keywords: > >Date-Required: > >Class: sw-bug > >Submitter-Id: current-users > >Arrival-Date: Wed Mar 15 11:10:21 GMT 2006 > >Closed-Date: > >Last-Modified: > >Originator: Sven Berkvens-Matthijsse > >Release: FreeBSD 4.10-STABLE i386 > >Organization: > ilse media BV > >Environment: > System: FreeBSD serv7.ilse.net 4.10-STABLE FreeBSD 4.10-STABLE #23: Wed Aug 4 15:18:52 CEST 2004 root@tango.ilse.net:/usr/obj/usr/src/sys/BAROQUE i386 > > >Description: > send(), sendto() and sendmsg() can return prematurely in the libc_r > implementation. If the socket has space available, but not enough to > accommodate the whole data block at once, the kernel's sendto() will > return with a premature byte count, because all the sockets are always > put into nonblocking mode. However, unlike write(), which does > implement this correctly, the implementation of sendto() and co do not > check for this condition if the thread's notion of the socket was > non-blocking. Instead, it just returns the permature bytecount instead > of starting another sendto()/sendmsg() to complete the action (and > possibly putting the thread to sleep until poll() says it's okay to > try again), like a non-blocking version should. We're not maintaining libc_r any longer, and 4.x is pretty much a dead branch. If you need bug fixes, you need to upgrade to 6.x stable and use libpthread or libthr. -- DE
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