The s6-svstat program

s6-svstat prints a short, human-readable summary of the state of a process monitored by s6-supervise.

Interface

     s6-svstat [ -n ] servicedir

s6-svstat gives information about the process being monitored at the servicedir service directory, then exits 0. The information includes the following:

whether the process is up or down, and if it's up, the number of seconds that it has been up.
the process' pid, if it is up, or its last exit code or terminating signal, if it is down
what its default state is, if it is different from its current state
the number of seconds since it last changed states
if the current state is transient and will change as soon as the kernel's scheduler picks up s6-supervise
whether the service is ready, as notified by the daemon itself, and if it is, the number of seconds that it has been. A service reported as down and ready simply means that it is ready to be brought up. A service is down and not ready when it is in the cleanup phase, i.e. the ./finish script is still being executed.

Options

-n : if the monitored process has been killed by a signal, print the signal number. By default, a symbolic name for the signal will be printed instead.

Exit codes

0: success
1: s6-supervise not running on servicedir
100: wrong usage
111: system call failed