> Can anyone point me to some ptrace() documentation? I've looked at the
> source to strace and several other programs. I can see how to print out
> and trace system calls, but I don't see how to change the return value.
You write the return value into the child's EAX at syscall return time.
If you've got the user-mode port code, look in
arch/um/kernel/syscall_user.c (do-syscall() for reading out the system
call and arguments and annulling the system call, exit_kernel() for
setting the return value).
Jeff
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