I have written an implementation of read(int, void*, size_t) that I
am trying to use via DYLD_INSERT_LIBRARIES. I have this working
fine
on 10.4, but not on 10.5.
I have read http://lists.apple.com/archives/Darwin-dev/2007/Nov/
msg00061.html but am still not clear on what I need to do. A follow
up to that post mentions including a header. I can't seem to
find any
detail on this header.
Look at the function prototype declaration in <unistd.h> on
10.5. You have to do yours the same way. Macros are defined in
<sys/cdefs.h>.
Specifically, I think I need to provide all 3 symbols (_read, _read
$UNIX2003 and _read$NOCANCEL$UNIX2003) for this to work.
The thing that's killing you is you are using -mmacosx-version-
min=10.4
When we compile Libc, we compile it three times in order to get the
three versions of the symbols, once each with different
definitions. You'll never get the $NOCANCEL version of the symb
(the one that avoids the _thread_testcancel() at the start of the
system call in the kernel) on a 10.4 deployment target.
Thanks Terry.
Just to clarify, I need to build three different dylibs? There is no
way to produce one dylib with all three symbols? Apologies for what
may be obvious questions. I am a bit out of my depth here.
Thanks.
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