(This question is about the Mac OS X version of dtrace, but I'm told they don't
do anything special there.)
I can use copyout() to modify the program's memory (with -w) and thus patch up
errant functions' memory in user space. But what if I need to patch a
function's return value, or its arguments? Arg0 etc. are read-only ("operator =
can only be applied to a writable variable"), so I can't assign to them. The
same appears to apply to uregs[]. That seems to severely restrict the kinds of
interventions I am allowed, particularly on register-based architectures.
Cheers
-- perry
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