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

Create a launcher program that will wait for a signal of some sort (not necessarily a literal signal, just an indication that it's ready), then exec() your target. Now dtrace -p the launcher program, and once dtrace is up, let the launcher go.