Date: Wed, 21 Jun 2006 20:38:49 -0400 From: Alexander Kabaev <kabaev@gmail.com> To: Alexander Kabaev <kabaev@gmail.com> Cc: Alexander Leidinger <Alexander@Leidinger.net>, freebsd-current@FreeBSD.org, Norikatsu Shigemura <nork@FreeBSD.org> Subject: Re: Linux-flashplugin7 & rtld - RFC Message-ID: <20060621203849.4fcbbf22@kan.dnsalias.net> In-Reply-To: <20060621085440.67f0800e@kan.dnsalias.net> References: <44986777.6070601@FreeBSD.org> <20060621061437.GA53019@fit.vutbr.cz> <ygeodwn2fea.wl%ume@mahoroba.org> <2265.211.18.249.19.1150871779.squirrel@mail.ninth-nine.com> <20060621121114.h6udocel5wsgg8sg@netchild.homeip.net> <2692.219.127.74.121.1150885501.squirrel@mail.ninth-nine.com> <20060621085440.67f0800e@kan.dnsalias.net>
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On Wed, 21 Jun 2006 08:54:40 -0400
Alexander Kabaev <kabaev@gmail.com> wrote:
> On Wed, 21 Jun 2006 19:25:01 +0900 (JST)
> "Norikatsu Shigemura" <nork@FreeBSD.org> wrote:
>=20
> > > Quoting Norikatsu Shigemura <nork@freebsd.org> (from Wed, 21 Jun
> > > 2006 15:36:19 +0900 (JST)):
> > >>> Nork-san says that it is hard to make LPW work on 7-CURRENT.
> > >>> But, he is trying to make it work with another approach.
> > >> Yes, I'm working Userland COMPAT_LINUX technology[TM]:-).
> > > Can you be a little bit more verbose what this is? Just a high
> > > level overview. I'm curious since I have some ideas about some
> > > kind of cross-compatibility "something" too (a combination of
> > > objcopy, a liblinux2bsd and maybe some libmap stuff).
> >=20
> > I'm implementing like following codes to libc/libm/libpthread
> > on 7-current with SYMVER_ENABLED=3Dyes.
> >=20
> > - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
> > #include <sys/types.h>
> > #include <sys/cdefs.h>
> >=20
> > #define SYM_COMPAT(sym, impl, ver) \
> > __sym_compat(sym, impl, ver)
> > #define GLIBC_SYMBOL_2(sym, major, minor) \
> > GLIBC_##major##_##minor##_##sym
> > #define GLIBC_COMPAT_2(sym, major, minor) \
> > SYM_COMPAT(sym, GLIBC_SYMBOL_2(sym, major, minor), GLIBC_
> > ##major. ##minor);
> >=20
> > #include <string.h>
> >=20
> > /*
> > * strcmp(3)
> > */
> > GLIBC_COMPAT_2(strcmp, 2, 0);
> >=20
> > int
> > GLIBC_SYMBOL_2(strcmp, 2, 0)
> > (const char *s1, const char *s2)
> > {
> > int ret;
> > ret =3D strcmp(s1, s2);
> >=20
> > dprintf("strcmp(\"%s\", \"%s\") =3D %d", s1, s2, ret);
> >=20
> > return ret;
> > }
> > - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
> >=20
> > And Version.def, too.
> > - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
> > # $FreeBSD$
> >=20
> > GLIBC_2.0 {
> > strcmp;
> > :
> > }
> > - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
> >=20
> > _______________________________________________
> > freebsd-current@freebsd.org mailing list
> > http://lists.freebsd.org/mailman/listinfo/freebsd-current
> > To unsubscribe, send any mail to
> > "freebsd-current-unsubscribe@freebsd.org"
>=20
> Thanks for doing this. This strikes me as much more robust and clean
> way of doing things.
>=20
> --=20
> Alexander Kabaev
To clarify: createing our own libc and libm wrapper libraries which
provide symbols with proper versions is the way to go, NOT spamming
native libraries with junk symbols.
--=20
Alexander Kabaev
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