Date: Sun, 14 Jun 2009 12:41:41 +0300 From: Kostik Belousov <kostikbel@gmail.com> To: Maho NAKATA <chat95@mac.com> Cc: kan@freebsd.org, openoffice@freebsd.org Subject: Re: ld.so slight difference Linux and FreeBSD ports/127946 Message-ID: <20090614094141.GF23592@deviant.kiev.zoral.com.ua> In-Reply-To: <20090614.081457.193757375.chat95@mac.com> References: <20090613.175239.193757216.chat95@mac.com> <20090613.211918.71168302.chat95@mac.com> <1244902235.49065.33.camel@localhost> <20090614.081457.193757375.chat95@mac.com>
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[-- Attachment #1 --] On Sun, Jun 14, 2009 at 08:14:57AM +0900, Maho NAKATA wrote: > Hello Konstantin, and * > > We have a longstanding OpenOffice.org porting issue for FreeBSD. > Strange crashes. > So I'd like to ask you about following issue. > http://www.openoffice.org/issues/show_bug.cgi?id=22253 > . > There are some small difference between ld.so implementation > between FreeBSD and Linux. Here is the test program that identify > the difference clearly. (it also applies to NetBSD) > > ------------------------------------------------ > "dlsym() search _on_the_main_program_" i.e. the handle is not the > dlopen()ed shared library itself, but the main program (which you get > back with dlopen(NULL, RTLD_LAZY) ) > I've modified your test program a bit: > > #include <stdio.h> > #include <stdlib.h> > #include <dlfcn.h> > > int main(int argc, char **argv) { > void *handle, *handlemain; > double (*cosine)(double); > char *error; > > handle = dlopen ("libm.so", RTLD_LAZY|RTLD_GLOBAL); > if (!handle) { > fprintf (stderr, "%s\n", dlerror()); > exit(1); > } > > handlemain = dlopen(NULL, RTLD_LAZY); > cosine = dlsym(handlemain, "cos"); > if ((error = dlerror()) != NULL) { > fprintf (stderr, "%s\n", error); > exit(1); > } > > printf ("%f\n", (*cosine)(2.0)); > dlclose(handle); > return 0; > } > > On Linux: > bash-2.05b$ ./a.out > -0.416147 > > while on NetBSD: > -bash-2.05b$ ./a.out > Undefined symbol "cos" > ------------------------------------------------ > > It seems that this is the root cause of some issues. > http://www.openoffice.org/issues/show_bug.cgi?id=22253 > http://www.openoffice.org/issues/show_bug.cgi?id=98781 > maybe also > http://www.freebsd.org/cgi/query-pr.cgi?pr=128176 > > It seems ld.so employs same mechanism between Linux and MacOSX. > > Could you please help me a bit? According to the Solaris dlopen(3) and dlsym(3) documentation, objects opened with RTLD_GLOBAL shall participate in any dlsym() search. Please, try the following patch. diff --git a/libexec/rtld-elf/rtld.c b/libexec/rtld-elf/rtld.c index 40ed6ed..2badcfc 100644 --- a/libexec/rtld-elf/rtld.c +++ b/libexec/rtld-elf/rtld.c @@ -2141,6 +2141,11 @@ do_dlsym(void *handle, const char *name, void *retaddr, const Ver_Entry *ve, &donelist); } } + if (def == NULL) { + donelist_init(&donelist); + def = symlook_list(name, hash, &list_global, &defobj, ve, flags, + &donelist); + } if (def != NULL) { rlock_release(rtld_bind_lock, lockstate); [-- Attachment #2 --] -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.9 (FreeBSD) iEYEARECAAYFAko0xdQACgkQC3+MBN1Mb4gbzQCg2BFSMDvYKzodMzb9Kg5FQtlm uzUAoJCmKRKNWmGJ6CpV1b2lnig4XIen =ifDd -----END PGP SIGNATURE-----
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