site_archiver@lists.apple.com Delivered-To: darwin-dev@lists.apple.com % nm -m /usr/lib/libc.dylib | grep _open ... 00085324 (__TEXT,__text) external _open 000012c8 (__TEXT,__text) external _open$NOCANCEL$UNIX2003 0000be8c (__TEXT,__text) external _open$UNIX2003 -- Greg Parker gparker@apple.com Runtime Wrangler _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-dev mailing list (Darwin-dev@lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-dev/site_archiver%40lists.appl... bejo wrote: I'm trying to interpose system's open() function with my own using the dyld, I had no problem with that on Tiger, but the same code on Leopard doesn't work any longer. I compile my library this way: gcc -arch ppc -dynamiclib -fno-common -o open_interposer.dylib open_interposer.c and then I run my app this way: DYLD_INSERT_LIBRARIES=open_interposer.dylib DYLD_FORCE_FLAT_NAMESPACE=1 ./my_app and the application is still using system's open() function instead of mine :(. DYLD_PRINT_LIBRARIES=1 shows that pen_interposer.dylib is loaded before other libs. open() is more than meets the eye in Leopard. You may need to interpose more than one entry point. When you type `open(...)` in your C code, one of those symbol names is chosen depending on your compile options (specifically UNIX compliance, in this case). You can use `nm -m` on your app to see which version it's linking to. For example, a trivial 32-bit i386 test program built on Leopard with `cc` and no other options uses _open $UNIX2003. (I don't know whether function interposing still works the way you want even after working around this change.) This email sent to site_archiver@lists.apple.com