From madore@clipper.ens.fr Sun Sep 17 21:41:08 2000 Article: 692 of ens.forum.informatique.internet Path: eleves!not-for-mail From: madore@clipper.ens.fr (GroTeXdieck) Newsgroups: ens.forum.informatique.internet Subject: Re: Mozilla vs Netscape 4.x Date: 17 Sep 2000 19:41:08 GMT Lines: 62 Sender: madore@clipper.ens.fr Message-ID: <8q36ok$dhu$1@clipper.ens.fr> References: <8pd2oi$dt5$1@clipper.ens.fr> <8pjb7m$q7s$2@clipper.ens.fr> <8pl3vd$jvo$1@clipper.ens.fr> <8pl5b5$kvm$7@clipper.ens.fr> <8pl9op$7g2$1@clipper.ens.fr> NNTP-Posting-Host: clipper.ens.fr Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 8bit X-Trace: clipper.ens.fr 969219668 13886 129.199.129.1 (17 Sep 2000 19:41:08 GMT) X-Complaints-To: forum@clipper.ens.fr NNTP-Posting-Date: 17 Sep 2000 19:41:08 GMT X-Newsreader: Flrn (0.4.0 - 07/99) X-Start-Date: 17 Sep 2000 19:33:30 GMT Xref: eleves ens.forum.informatique.internet:692 Tout compte fait, ça marche. Le programme ressemble à ceci : --- cut here --- #include #include #include #ifndef REPEAT_COUNT #define REPEAT_COUNT 8 #endif #ifdef DLOPEN_LIBC static void *libc; #endif static int (*real_sendto) (int socket, const void *buffer, size_t size, int flags, const struct sockaddr *addr, socklen_t length) = NULL; int sendto (int socket, const void *buffer, size_t size, int flags, const struct sockaddr *addr, socklen_t length) { int retval; int cnt; for ( cnt=0 ; cnt References: <903ocd$6f7$1@clipper.ens.fr> <903sha$ic0$1@clipper.ens.fr> <903u1k$lvu$1@clipper.ens.fr> <9054f6$1sn$1@clipper.ens.fr> NNTP-Posting-Host: clipper.ens.fr X-Trace: clipper.ens.fr 975591153 14368 129.199.129.1 (30 Nov 2000 13:32:33 GMT) X-Complaints-To: forum@clipper.ens.fr NNTP-Posting-Date: Thu, 30 Nov 2000 13:32:33 +0000 (UTC) X-Newsreader: Flrn (0.4.0 - 07/99) X-Start-Date: 30 Nov 2000 12:34:18 GMT Xref: eleves ens.forum.syst:2935 ens.forum.informatique:3598 Thomas Pornin in litteris <9054f6$1sn$1@clipper.ens.fr> scripsit: > Malgré de nombreuses dénégations des RMS-fans, les histoires de > versionning des symboles ça sux gravissime. Rappelons à toutes fins utiles que le versioning a été introduit dans la version 2.1 de la GNU libc (et la version correspondante des binutils) et qu'il n'était pas disponible dans la version 2.0. Par conséquent, toute argumentation sur l'incompatibilité entre les versions 2.0 et 2.1 de la GNU libc ne relève *pas* du versioning. D'autre part, pour ceux qui ne connaîtraient pas, rappelons brièvement et par un exemple comment cela marche : vega david /tmp $ cat > mydl.h extern const char dlvers[]; int frobnicate (void); vega david /tmp $ cat > mydl.c #include #include "mydl.h" const char dlvers_1_0[] = "1.0"; int frobnicate (void) { return 42; } __asm__ (".symver dlvers_1_0,dlvers@@MYDL_1.0"); vega david /tmp $ cat > mydl.script MYDL_1.0 { global: frobnicate; dlvers; local: __*; }; vega david /tmp $ gcc -o libmydl-1.0.so mydl.c -O6 -Wall -fPIC -DPIC -shared -Wl,--version-script,mydl.script vega david /tmp $ rm -f libmydl.so ; ln -s libmydl-1.0.so libmydl.so vega david /tmp $ cat > testdl.c #include #include "mydl.h" int main (void) { printf ("Library version is %s\n", dlvers); printf ("Frobnicate returns %d\n", frobnicate ()); return 0; } vega david /tmp $ gcc -o testdl testdl.c -O6 -Wall libmydl.so -Wl,-rpath,/tmp vega david /tmp $ ./testdl Library version is 1.0 Frobnicate returns 42 vega david /tmp $ cat > mydl.c #include #include "mydl.h" const char dlvers_1_0[] = "1.0"; const char dlvers_1_1[] = "1.1"; int __broken_frobnicate (void) { return 42; } int frobnicate (void) { return 1729; } __asm__ (".symver dlvers_1_0,dlvers@MYDL_1.0"); __asm__ (".symver dlvers_1_1,dlvers@@MYDL_1.1"); __asm__ (".symver __broken_frobnicate,frobnicate@MYDL_1.0"); vega david /tmp $ cat > mydl.script MYDL_1.0 { global: dlvers; local: __*; }; MYDL_1.1 { global: frobnicate; } MYDL_1.0; vega david /tmp $ gcc -o libmydl-1.1.so mydl.c -O6 -Wall -fPIC -DPIC -shared -Wl,--version-script,mydl.script vega david /tmp $ rm -f libmydl.so ; ln -s libmydl-1.1.so libmydl.so vega david /tmp $ ./testdl Library version is 1.0 Frobnicate returns 42 vega david /tmp $ gcc -o testdl testdl.c -O6 -Wall libmydl.so -Wl,-rpath,/tmp vega david /tmp $ ./testdl Library version is 1.1 Frobnicate returns 1729 vega david /tmp $ rm -f libmydl.so ; ln -s libmydl-1.0.so libmydl.so vega david /tmp $ ./testdl ./testdl: /tmp/libmydl.so: version `MYDL_1.1' not found (required by ./testdl) vega david /tmp $ cat > mydl.h extern const char dlvers[]; int frobnicate (int foo); vega david /tmp $ cat > mydl.c #include #include "mydl.h" const char dlvers_1_0[] = "1.0"; const char dlvers_1_1[] = "1.1"; const char dlvers_2_0[] = "2.0"; int __broken_frobnicate (void) { return 42; } int __old_prototype_frobnicate (void) { return 1729; } int frobnicate (int foo) { return foo; } __asm__ (".symver dlvers_1_0,dlvers@MYDL_1.0"); __asm__ (".symver dlvers_1_1,dlvers@MYDL_1.1"); __asm__ (".symver dlvers_2_0,dlvers@@MYDL_2.0"); __asm__ (".symver __broken_frobnicate,frobnicate@MYDL_1.0"); __asm__ (".symver __old_prototype_frobnicate,frobnicate@MYDL_1.1"); vega david /tmp $ cat > mydl.script MYDL_1.0 { global: dlvers; local: __*; }; MYDL_1.1 { } MYDL_1.0; MYDL_2.0 { global: frobnicate; } MYDL_1.1; vega david /tmp $ gcc -o libmydl-2.0.so mydl.c -O6 -Wall -fPIC -DPIC -shared -Wl,--version-script,mydl.script vega david /tmp $ rm -f libmydl.so ; ln -s libmydl-2.0.so libmydl.so vega david /tmp $ ./testdl Library version is 1.1 Frobnicate returns 1729 vega david /tmp $ cat > testdl.c #include #include "mydl.h" int main (void) { printf ("Library version is %s\n", dlvers); printf ("Frobnicate (10) returns %d\n", frobnicate (10)); return 0; } vega david /tmp $ gcc -o testdl testdl.c -O6 -Wall libmydl.so -Wl,-rpath,/tmp vega david /tmp $ ./testdl Library version is 2.0 Frobnicate (10) returns 10