Date: Fri, 30 May 2008 19:30:03 GMT From: Kris Kennaway <kris@FreeBSD.org> To: freebsd-bugs@FreeBSD.org Subject: Re: misc/124114: 7.0 shared libs cannot read errno when loaded into a 6.0 pthreaded program Message-ID: <200805301930.m4UJU3OQ085011@freefall.freebsd.org>
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The following reply was made to PR misc/124114; it has been noted by GNATS. From: Kris Kennaway <kris@FreeBSD.org> To: Martin Simmons <martin@lispworks.com> Cc: freebsd-gnats-submit@FreeBSD.org Subject: Re: misc/124114: 7.0 shared libs cannot read errno when loaded into a 6.0 pthreaded program Date: Fri, 30 May 2008 21:21:32 +0200 Martin Simmons wrote: >> Description: > There is something wrong with the way that errno is resolved when running 6.0 programs on 7.0-RELEASE with the compat6x-i386-6.3.602114.200711 pkg. > > If a 7.0 shared library that uses errno is loaded into a 6.0 program that uses pthreads, then the value of errno in the library code will be incorrect. In particular, it will access the global errno value instead of the thread-specific one. This is the expected behaviour. You *cannot*, in general, expect binaries linked to a mixture of libraries from different releases to work. It is possible in restricted circumstances to carefully design your a library so that this will not happen, but random libraries do not have this property. Kris
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