Hi - On Mon, Jun 30, 2008 at 11:21:30AM -0400, Chris Moller wrote: > [...] > >FWIW, it'd make more sense to me if such a file was per-process > >(under the /proc/$pid/) hierarchy. > > A single debugger app using utracer could control any number of > processes and there could be any number of debugging apps using the > utracer module. [...]
It's not a big stretch to ask that such a debugger open N /proc/$$/ctl files. That makes it even more natural should the debugger need to wait for an event on some subset of them: just a single poll()/select() with the file descriptors. In a way, it's nothing more than implicitly passing a task_struct/pid, instead of explicitly in a ioctl structure. (You could go even farther plan-9-ey with representing thread state as manipulable files.) In any case, I'm sure Roland has a big steaming brain dump waiting for us laying out his vision for user-space interfaces to utrace. - FChE
