I'm trying to port an LD_PRELOAD trick from Linux to MacOS X. Given the
following two files:
foo.c:
------
#include <stdio.h>
int my_var = 64;
void __attribute__((constructor)) my_init() {
printf("Constructor called!\n");
}
bar.c:
------
int main() {
return 0;
}
Things work as expected on RedHat Linux Fedora Core 2:
gcc version 3.2.2 20030222 (Red Hat Linux 3.2.2-5)
------------------------------------------------------
% gcc -o bar bar.c
% gcc -o foo.so -fPIC -shared foo.c
% LD_PRELOAD="./foo.so" ./bar
Constructor called!
%
But on MacOS X 10.3.8, unhappiness:
gcc version 3.3 20030304 (Apple Computer, Inc. build 1671)
(This is the latest and greatest of Apple's gcc, AFAIK)
----------------------------------------------------------
% gcc -dynamiclib -fno-common -o foo.dylib foo.c
% gcc -o bar bar.c
% DYLD_INSERT_LIBRARIES="foo.dylib" ./bar
%
% DYLD_INSERT_LIBRARIES="foo.dylib" DYLD_PRINT_LIBRARIES=1 ./bar
loading libraries for DYLD_INSERT_LIBRARIES=foo.dylib
loading library: foo.dylib
loading libraries for image: ./bar
loading library: foo.dylib
loading library: /usr/lib/libSystem.B.dylib
loading libraries for image: foo.dylib
loading libraries for image: /usr/lib/libSystem.B.dylib
loading library: /usr/lib/system/libmathCommon.A.dylib
loading libraries for image: /usr/lib/system/libmathCommon.A.dylib
%
As you can see, foo.dylib is, in fact, loaded. If I change the code such
that bar.c references some symbol in foo.c, and link bar directly with the
library, it works as expected.
If anyone reading this has a Tiger seed, would you mind seeing if this is
still broken?
Does anyone know of a workaround in Panther? I can edit foo.c to my heart's
content, but bar.c is not available to me. I've been thinking about
overriding some common symbol I hope will never actually be used (although I
don't know what that might be) as a potential hack.
Thanks,
Brian
_______________________________________________
Do not post admin requests to the list. They will be ignored.
Darwin-dev mailing list (email@hidden)
Help/Unsubscribe/Update your Subscription:
http://lists.apple.com/mailman/options/darwin-dev/email@hidden
This email sent to email@hidden
