Dmitry Bogatov:
Thanks history, we have pid files, not `libpid' to talk to `pidd'.
Jonathan de Boyne Pollard:
You have forgotten about the existence of Debian Hurd. (-: * https://jdebp.eu./FGA/hurd-daemons.html#proc
Samuel Thibault:
Not in this case. I pointed earlier to the "pidd". Debian Hurd doco and GNU Hurd doco are really bad, so here's the best of a bad job; the raw API for the "libpid":The Hurd precisely tries to expose things as files.
* http://git.savannah.gnu.org/cgit/hurd/hurd.git/tree/hurd/process.defs