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Make rc_configtest behave like rc_pre and rc_post; i.e. don't define a default
function (each rc.d script is supposed to define its own if wanted).
This way, we can filter out the "configtest" action depending on whether the
function exists or not.
Adapt documentation.

tweak/ok kn@

.\"	$OpenBSD: rc.d.8,v 1.40 2022/09/02 22:11:57 ajacoutot Exp $
.\"
.\" Copyright (c) 2021 Antoine Jacoutot
.\" Copyright (c) 2011 Robert Nagy, Antoine Jacoutot, Ingo Schwarze
.\" All rights reserved.
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.\" modification, are permitted provided that the following conditions
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.Dd $Mdocdate: September 2 2022 $
.Dt RC.D 8
.Os
.Sh NAME
.Nm rc.d
.Nd daemon control scripts
.Sh SYNOPSIS
.Nm /etc/rc.d/ Ns Ar daemon
.Op Fl df
.Ar action
.Sh DESCRIPTION
The
.Pa /etc/rc.d
directory contains
.Xr ksh 1
scripts to start, stop, and reconfigure daemon
programs
.Pq Dq services .
.Pp
Services installed from
.Xr packages 7
may be started at boot time in the order specified by the
.Va pkg_scripts
variable from
.Xr rc.conf 8 ;
the order will be reversed during shutdown.
Services comprising
.Ox
base are started by
.Xr rc 8 .
.Pp
The options are as follows:
.Bl -tag -width Ds
.It Fl d
Setting this option will print the function names as they are called
and prevent the
.Xr rc.subr 8
framework from redirecting stdout and stderr to /dev/null.
This is used to allow debugging of failed
.Ar actions .
.It Fl f
This option only affects the
.Cm start
action.
It will forcibly start the daemon whatever value
.Va daemon_flags
is set to.
If
.Va daemon_flags
is set to
.Dq NO ,
execution will continue with the script's own defaults unless other
flags are specified.
.El
.Pp
Each such script responds to the following
.Ar actions :
.Pp
.Bl -tag -width configtest -offset indent -compact
.It Cm start
Start the service, if not already running.
.It Cm stop
Stop the service.
.It Cm reload
Tell the daemon to reload its configuration.
.It Cm restart
Perform a stop, then a start.
.It Cm check
Return 0 if the daemon is running or 1 if it is not.
.It Cm configtest
Check that the daemon configuration is valid.
.El
.Sh ENVIRONMENT
Daemon control scripts use a fixed number of
.Xr ksh 1
variables when starting a daemon.
The following can be overridden by site-specific values provided in
.Xr rc.conf.local 8 :
.Bl -tag -width daemon_timeout -offset indent
.It Ar daemon Ns _execdir
Run daemon from the specified directory.
.It Ar daemon Ns _flags
Additional arguments to call the daemon with.
These will be appended to any mandatory arguments already contained in the
.Va daemon
variable defined in the control script.
If
.Ar daemon Ns _flags
is set to
.Dq NO ,
it will prevent the daemon from starting even when listed in
.Va pkg_scripts .
.It Ar daemon Ns _logger
Redirect standard output and error to
.Xr logger 1
using the configured priority (e.g. "daemon.info").
.It Ar daemon Ns _rtable
Routing table to run the daemon under, using
.Xr route 8 .
.It Ar daemon Ns _timeout
Maximum time in seconds to wait for the
.Cm start ,
.Cm stop
and
.Cm reload
actions to return.
This is only guaranteed with the default
.Ic rc_start ,
.Ic rc_stop
and
.Ic rc_reload
functions.
.It Ar daemon Ns _user
User to run the daemon as, using
.Xr su 1 .
.El
.Pp
To obtain the actual variable names, replace
.Ar daemon
with the name of the script.
For example, postgres is managed through
.Pa /etc/rc.d/postgresql :
.Pp
.Dl daemon_flags=-D /var/postgresql/data -w -l /var/postgresql/logfile
.Pp
To override this and increase the debug log level (keeping the existing
flags), define the following in
.Xr rc.conf.local 8 :
.Pp
.Dl postgresql_flags=-D /var/postgresql/data -w -l /var/postgresql/logfile -d 5
.Pp
Each script may define its own defaults, as explained in
.Xr rc.subr 8 .
.Pp
.Va daemon_class
is a special read-only variable.
It is set to
.Dq daemon
unless there is a login class configured in
.Xr login.conf 5
with the same name as the
.Nm rc.d
script itself,
in which case it will be set to that login class.
This allows setting many initial process properties, for example
environment variables, scheduling priority, and process limits
such as maximum memory use and number of files.
.Sh FILES
.Bl -tag -width Ds
.It Pa /etc/rc.d/
Directory containing daemon control scripts.
.It Pa /etc/rc.d/rc.subr
Functions and variables used by
.Nm rc.d
scripts.
.It Pa /var/run/rc.d/
Directory containing files recording the variables of currently running daemons.
Some are informational and some are for matching daemons using
.Xr pgrep 1
and
.Xr pkill 1 .
.El
.Sh SEE ALSO
.Xr ksh 1 ,
.Xr rc 8 ,
.Xr rc.conf 8 ,
.Xr rc.subr 8 ,
.Xr rcctl 8
.Sh HISTORY
The
.Pa /etc/rc.d
directory
first appeared in
.Ox 4.9 .