How to trace a program from its very beginning without running it as root

Question

I\'m writing a tool that calls through to DTrace to trace the program that the user specifies.

If my tool uses dtrace -c to run the program as a subprocess of DTrace, no

Answer 1

See my answer on related question "How can get dtrace to run the traced command with non-root priviledges?" [sic].

Essentially, you can start a (non-root) background process which waits 1sec for DTrace to start up (sorry for race condition), and snoops the PID of that process.

sudo true && \
(sleep 1; cat /etc/hosts) &; \
sudo dtrace -n 'syscall:::entry /pid == $1/ {@[probefunc] = count();}' $! \
&& kill $!

Full explanation in linked answer.