search for: altpid

...e files intended to persist across reboots /var/run/nut: - pidfiles - (probably) sockets 1) configure args slightly confusing autoconf vs nut nut has configure args in two groups; one setting the usual autoconf variables not really about nut, and the second group setting state, pid, altpid: --sharedstatedir=DIR modifiable architecture-independent data [PREFIX/com] --localstatedir=DIR modifiable single-machine data [PREFIX/var] --runstatedir=DIR modifiable per-process data [LOCALSTATEDIR/run] --with-statepath=PATH path for ups state files (${STATEPATH}, typic...

...an not compromise important stuff - say, replace `upsmon.pid` with a content of `1` so the next `upsmon -c command` might signal `init` and bring down or otherwise confuse the OS). As such, daemons that start as not-root or drop privileges early can not create their PID or socket files there. * The ALTPIDPATH as commented is for PIDs of non-root daemons (since recently it is also checked for root daemons as a fallback, I think). * The STATEPATH is a historic misnomer: a long time ago drivers wrote their state regularly into a dedicated file which upsd then had regularly read to post data updates. Th...