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by /etc/rc. Similarly for printf with a format that does not end with "\n". Previously, the partial line would not be visible on the console until a newline was printed, possibly after an annoying delay. This is done by adding echo() and printf() shell functions to rc.subr, so that naive use of the echo and printf commands in rc.d scripts will call these functions instead of the underlying commands. These shell functions send a new "nop" metadata message after the partial line, and the rc_postprocess function in /etc/rc disentangles the partial line of plain output from the metadata "nop". Also add a "-n" option to the print_rc_normal function in rc.subr, and make some cosmetic changes.
850 lines
18 KiB
Groff
850 lines
18 KiB
Groff
.\" $NetBSD: rc.subr.8,v 1.29 2011/08/11 22:52:46 apb Exp $
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.\"
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.\" Copyright (c) 2002-2011 The NetBSD Foundation, Inc.
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.\" All rights reserved.
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.\"
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.\" This code is derived from software contributed to The NetBSD Foundation
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.\" by Luke Mewburn.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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.\" ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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.\" TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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.\" PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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.\" BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
|
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.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
|
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.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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.\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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.\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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.\" POSSIBILITY OF SUCH DAMAGE.
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.\"
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.Dd August 11, 2011
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.Dt RC.SUBR 8
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.Os
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.Sh NAME
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.Nm rc.subr
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.Nd functions used by system shell scripts
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.Sh SYNOPSIS
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.Bl -item
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.It
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.Li . /etc/rc.subr
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.It
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|
.Ic backup_file Ar action Ar file Ar current Ar backup
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.It
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.Ic checkyesno Ar var
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.It
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.Ic check_pidfile Ar pidfile Ar procname Op Ar interpreter
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.It
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.Ic check_process Ar procname Op Ar interpreter
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.It
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.Ic collapse_backslash_newline
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.It
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.Ic err Ar exitval Ar message
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.It
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|
.Ic load_rc_config Ar command
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.It
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|
.Ic load_rc_config_var Ar command Ar var
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.It
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|
.Ic mount_critical_filesystems Ar type
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.It
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|
.Ic no_rc_postprocess Ar command Op Ar arguments
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.It
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.Ic print_rc_metadata Ar string
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.It
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.Ic print_rc_normal Oo Fl n Oc Ar string
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.It
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|
.Ic rc_usage Ar command Op Ar ...
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.It
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.Ic reverse_list Ar item Op Ar ...
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.It
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|
.Ic run_rc_command Ar argument [parameters]
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.It
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.Ic run_rc_script Ar file Ar argument
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.It
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|
.Ic stop_boot
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.It
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|
.Ic twiddle
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.It
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|
.Ic wait_for_pids Op Ar pid Op Ar ...
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.It
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.Ic warn Ar message
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.It
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|
.Ic yesno_to_truefalse Ar var
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.El
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|
.Sh DESCRIPTION
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.Nm
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|
contains commonly used shell script functions which are used by
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various scripts such as
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.Xr rc 8 ,
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and the periodic system services which are controlled by
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.Xr daily.conf 5 ,
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.Xr monthly.conf 5 ,
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.Xr security.conf 5 ,
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and
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.Xr weekly.conf 5 .
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.Pp
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|
The
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.Nm
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|
functions are accessed by sourcing
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.Pa /etc/rc.subr
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into the current shell.
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.Pp
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|
The following shell functions are available:
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.Bl -tag -width 4n
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|
.It Ic backup_file Ar action Ar file Ar current Ar backup
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|
Make a backup copy of
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.Ar file
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|
into
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|
.Ar current .
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If the
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.Xr rc.conf 5
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variable
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.Sy backup_uses_rcs
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is
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.Sq YES ,
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use
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.Xr rcs 1
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to archive the previous version of
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.Ar current ,
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otherwise save the previous version of
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.Ar current
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as
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.Ar backup .
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.Pp
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.Ar action
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may be one of the following:
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.Bl -tag -width remove
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.It Sy add
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.Ar file
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|
is now being backed up by or possibly re-entered into this backup mechanism.
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.Ar current
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is created, and if necessary, the
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.Xr rcs 1
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files are created as well.
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.It Sy update
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.Ar file
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has changed and needs to be backed up.
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If
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.Ar current
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exists, it is copied to
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.Ar backup
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or checked into
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.Xr rcs 1
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(if the repository file is old),
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and then
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.Ar file
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is copied to
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.Ar current .
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.It Sy remove
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.Ar file
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is no longer being tracked by this backup mechanism.
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If
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.Xr rcs 1
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is being used, an empty file is checked in and
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.Ar current
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is removed,
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otherwise
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.Ar current
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is moved to
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.Ar backup .
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.El
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|
.It Ic checkyesno Ar var
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Return 0 if
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.Ar var
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is defined to
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.Sq YES ,
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.Sq TRUE ,
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.Sq ON ,
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or
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.Sq 1 .
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Return 1 if
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.Ar var
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is defined to
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.Sq NO ,
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.Sq FALSE ,
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.Sq OFF ,
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or
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.Sq 0 .
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Otherwise, warn that
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.Ar var
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is not set correctly.
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The values are case insensitive.
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.Pp
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Note that the warning message shown by this function when
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.Ar var
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is not set references a manual page where the user can find more information.
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Its name is picked up from the
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.Sy rcvar_manpage
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variable.
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.It Ic check_pidfile Ar pidfile Ar procname Op Ar interpreter
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Parses the first word of the first line of
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.Ar pidfile
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for a PID, and ensures that the process with that PID
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is running and its first argument matches
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.Ar procname .
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Prints the matching PID if successful, otherwise nothing.
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If
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.Ar interpreter
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is provided, parse the first line of
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.Ar procname ,
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ensure that the line is of the form
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.Dl #! interpreter [...]
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and use
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.Ar interpreter
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with its optional arguments and
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.Ar procname
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appended as the process string to search for.
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.It Ic check_process Ar procname Op Ar interpreter
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Prints the PIDs of any processes that are running with a first
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argument that matches
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.Ar procname .
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.Ar interpreter
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is handled as per
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.Ic check_pidfile .
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.It Ic collapse_backslash_newline
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|
Copy input to output, collapsing
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.Ao backslash Ac Ns Ao newline Ac
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to nothing, but leaving other backslashes alone.
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.It Ic err Ar exitval Ar message
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|
Display an error message to
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.Em stderr ,
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log it to the system log
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using
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|
.Xr logger 1 ,
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|
and
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.Cm exit
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with an exit value of
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.Ar exitval .
|
|
The error message consists of the script name
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|
(from
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.Sy $0 ) ,
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followed by
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.Dq ": ERROR: " ,
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and then
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.Ar message .
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.It Ic load_rc_config Ar command
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|
Source in the
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.Xr rc.conf 5
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|
configuration files for
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.Ar command .
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First,
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.Pa /etc/rc.conf
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|
is sourced if it has not yet been read in.
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|
Then,
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.Pa /etc/rc.conf.d/ Ns Ar command
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|
is sourced if it is an existing file.
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|
The latter may also contain other variable assignments to override
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|
.Ic run_rc_command
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|
arguments defined by the calling script, to provide an easy
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|
mechanism for an administrator to override the behaviour of a given
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|
.Xr rc.d 8
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|
script without requiring the editing of that script.
|
|
.It Ic load_rc_config_var Ar command Ar var
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|
Read the
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.Xr rc.conf 5
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variable
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|
.Ar var
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|
for
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.Ar command
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|
and set in the current shell, using
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|
.Ic load_rc_config
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|
in a sub-shell to prevent unwanted side effects from other variable
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|
assignments.
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|
.It Ic mount_critical_filesystems Ar type
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|
Go through a list of critical file systems,
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|
as found in the
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|
.Xr rc.conf 5
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|
variable
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|
.Sy critical_filesystems_ Ns Ar type ,
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|
mounting each one that
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|
is not currently mounted.
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|
.It Ic no_rc_postprocess Ar command Op Ar arguments
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|
Execute the specified command with the specified arguments,
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|
in such a way that its output bypasses the post-processor that
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|
.Xr rc 8
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|
uses for most commands.
|
|
This implies that the output will not appear in the
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|
.Pa /var/run/rc.log
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|
file, and will appear on the console regardless of the
|
|
value of
|
|
.Va rc_silent .
|
|
This is expected to be useful for interactive commands,
|
|
and this mechanism is automatically used by
|
|
.Ic run_rc_command
|
|
when a script contains the
|
|
.Xr rcorder 8
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|
keyword
|
|
.Dq interactive .
|
|
.Pp
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|
If invoked from a context that does not appear to be under the control of
|
|
.Xr rc 8 ,
|
|
then the command is executed without special treatment.
|
|
.It Ic print_rc_metadata Ar string
|
|
Print the specified
|
|
.Ar string
|
|
in such a way that it should be handled as meta-data by the
|
|
.Xr rc 8
|
|
post-processor.
|
|
If invoked from a context that does not appear to be under the control of
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|
.Xr rc 8 ,
|
|
then the
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|
.Ar string
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|
is discarded.
|
|
.Pp
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|
Any
|
|
.Xr rc.d 8
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|
script may invoke this function with an argument that begins with
|
|
.Dq note: ,
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|
followed by one line of arbitrary text;
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|
the text will be logged by
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|
.Xr rc 8
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|
but will not be displayed on the console.
|
|
.Pp
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|
The use of arguments that do not begin with
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|
.Dq note:
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|
is reserved for internal use by
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|
.Xr rc 8
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|
and
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|
.Nm .
|
|
.It Ic print_rc_normal Oo Fl n Oc Ar string
|
|
Print the specified
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|
.Ar string
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|
in such a way that it should be handled as normal output by the
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|
.Xr rc 8
|
|
post-processor.
|
|
If invoked from a context that does not appear to be under the control of
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|
.Xr rc 8 ,
|
|
then the
|
|
.Ar string
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|
is printed to standard output.
|
|
.Pp
|
|
If the
|
|
.Fl n
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|
flag is specified, then the string is printed without a newline.
|
|
.Pp
|
|
Intended use cases include:
|
|
.Bl -bullet
|
|
.It
|
|
An rc.d script can use
|
|
.Dq Sy print_rc_normal Fl n
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|
to print a partial line in such a way that it appears
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|
immediately instead of being buffered by
|
|
.Xr rc 8 Ap s
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|
post-processor.
|
|
.It
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|
An rc.d script that is run via the
|
|
.Sy no_rc_postprocess
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|
function (so most of its output is invisible to
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|
.Xr rc 8 Ap s
|
|
post-processor) can use
|
|
.Sy print_rc_normal
|
|
to force some of its output to be seen by the post-processor.
|
|
.El
|
|
.It Ic rc_usage Ar command Op Ar ...
|
|
Print a usage message for
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|
.Sy $0 ,
|
|
with
|
|
.Ar commands
|
|
being the list of valid arguments
|
|
prefixed by
|
|
.Dq "[fast|force|one]" .
|
|
.It Ic reverse_list Ar item Op Ar ...
|
|
Print the list of
|
|
.Ar items
|
|
in reverse order.
|
|
.It Ic run_rc_command Ar argument Op Ar parameter ...
|
|
Run the
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|
.Ar argument
|
|
method for the current
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|
.Xr rc.d 8
|
|
script, based on the settings of various shell variables.
|
|
.Ic run_rc_command
|
|
is extremely flexible, and allows fully functional
|
|
.Xr rc.d 8
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|
scripts to be implemented in a small amount of shell code.
|
|
The optional set of parameters is passed verbatim to the command, but not to its
|
|
pre/post hooks.
|
|
.Pp
|
|
.Ar argument
|
|
is searched for in the list of supported commands, which may be one
|
|
of:
|
|
.Bl -tag -width restart -offset indent
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|
.It Sy start
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|
Start the service.
|
|
This should check that the service is to be started as specified by
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|
.Xr rc.conf 5 .
|
|
Also checks if the service is already running and refuses to start if
|
|
it is.
|
|
This latter check is not performed by standard
|
|
.Nx
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|
scripts if the system is starting directly to multi-user mode, to
|
|
speed up the boot process.
|
|
.It Sy stop
|
|
If the service is to be started as specified by
|
|
.Xr rc.conf 5 ,
|
|
stop the service.
|
|
This should check that the service is running and complain if it's not.
|
|
.It Sy restart
|
|
Perform a
|
|
.Sy stop
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|
then a
|
|
.Sy start .
|
|
Defaults to displaying the process ID of the program (if running).
|
|
.It Sy rcvar
|
|
Display which
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|
.Xr rc.conf 5
|
|
variables are used to control the startup of the service (if any).
|
|
.El
|
|
.Pp
|
|
If
|
|
.Sy pidfile
|
|
or
|
|
.Sy procname
|
|
is set, also support:
|
|
.Bl -tag -width restart -offset indent
|
|
.It Sy poll
|
|
Wait for the command to exit.
|
|
.It Sy status
|
|
Show the status of the process.
|
|
.El
|
|
.Pp
|
|
Other supported commands are listed in the optional variable
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|
.Sy extra_commands .
|
|
.Pp
|
|
.Ar argument
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|
may have one of the following prefixes which alters its operation:
|
|
.Bl -tag -width "Prefix" -offset indent
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|
.It Sy fast
|
|
Skip the check for an existing running process,
|
|
and sets
|
|
.Sy rc_fast=YES .
|
|
.It Sy force
|
|
Skip the checks for
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|
.Sy rcvar
|
|
being set to yes,
|
|
and sets
|
|
.Sy rc_force=YES .
|
|
This ignores
|
|
.Ar argument Ns Sy _precmd
|
|
returning non-zero, and ignores any of the
|
|
.Sy required_*
|
|
tests failing, and always returns a zero exit status.
|
|
.It Sy one
|
|
Skip the checks for
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|
.Sy rcvar
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|
being set to yes, but performs all the other prerequisite tests.
|
|
.El
|
|
.Pp
|
|
.Ic run_rc_command
|
|
uses the following shell variables to control its behaviour.
|
|
Unless otherwise stated, these are optional.
|
|
.Bl -tag -width procname -offset indent
|
|
.It Sy name
|
|
The name of this script.
|
|
This is not optional.
|
|
.It Sy rcvar
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|
The value of
|
|
.Sy rcvar
|
|
is checked with
|
|
.Ic checkyesno
|
|
to determine if this method should be run.
|
|
.It Sy rcvar_manpage
|
|
The manual page containing information about
|
|
.Sy rcvar .
|
|
It will be part of the warning message shown when
|
|
.Sy rcvar
|
|
is undefined.
|
|
Defaults to
|
|
.Xr rc.conf 5 .
|
|
.It Sy command
|
|
Full path to the command.
|
|
Not required if
|
|
.Ar argument Ns Sy _cmd
|
|
is defined for each supported keyword.
|
|
.It Sy command_args
|
|
Optional arguments and/or shell directives for
|
|
.Sy command .
|
|
.It Sy command_interpreter
|
|
.Sy command
|
|
is started with
|
|
.Dl #! command_interpreter [...]
|
|
which results in its
|
|
.Xr ps 1
|
|
command being
|
|
.Dl command_interpreter [...] command
|
|
so use that string to find the PID(s) of the running command
|
|
rather than
|
|
.Ql command .
|
|
.It Sy extra_commands
|
|
Extra commands/keywords/arguments supported.
|
|
.It Sy pidfile
|
|
Path to pid file.
|
|
Used to determine the PID(s) of the running command.
|
|
If
|
|
.Sy pidfile
|
|
is set, use
|
|
.Dl check_pidfile $pidfile $procname
|
|
to find the PID.
|
|
Otherwise, if
|
|
.Sy command
|
|
is set, use
|
|
.Dl check_process $procname
|
|
to find the PID.
|
|
.It Sy procname
|
|
Process name to check for.
|
|
Defaults to the value of
|
|
.Sy command .
|
|
.It Sy required_dirs
|
|
Check for the existence of the listed directories
|
|
before running the default start method.
|
|
.It Sy required_files
|
|
Check for the readability of the listed files
|
|
before running the default start method.
|
|
.It Sy required_vars
|
|
Perform
|
|
.Ic checkyesno
|
|
on each of the list variables
|
|
before running the default start method.
|
|
.It Sy ${name}_chdir
|
|
Directory to
|
|
.Ic cd
|
|
to before running
|
|
.Sy command ,
|
|
if
|
|
.Sy ${name}_chroot
|
|
is not provided.
|
|
.It Sy ${name}_chroot
|
|
Directory to
|
|
.Xr chroot 8
|
|
to before running
|
|
.Sy command .
|
|
Only supported after
|
|
.Pa /usr
|
|
is mounted.
|
|
.It Sy ${name}_env
|
|
List of additional or modified environment variables to set
|
|
when starting
|
|
.Sy command .
|
|
.It Sy ${name}_flags
|
|
Arguments to call
|
|
.Sy command
|
|
with.
|
|
This is usually set in
|
|
.Xr rc.conf 5 ,
|
|
and not in the
|
|
.Xr rc.d 8
|
|
script.
|
|
The environment variable
|
|
.Sq Ev flags
|
|
can be used to override this.
|
|
.It Sy ${name}_nice
|
|
.Xr nice 1
|
|
level to run
|
|
.Sy command
|
|
as.
|
|
Only supported after
|
|
.Pa /usr
|
|
is mounted.
|
|
.It Sy ${name}_user
|
|
User to run
|
|
.Sy command
|
|
as, using
|
|
.Xr chroot 8 .
|
|
if
|
|
.Sy ${name}_chroot
|
|
is set, otherwise
|
|
uses
|
|
.Xr su 1 .
|
|
Only supported after
|
|
.Pa /usr
|
|
is mounted.
|
|
.It Sy ${name}_group
|
|
Group to run the chrooted
|
|
.Sy command
|
|
as.
|
|
.It Sy ${name}_groups
|
|
Comma separated list of supplementary groups to run the chrooted
|
|
.Sy command
|
|
with.
|
|
.It Ar argument Ns Sy _cmd
|
|
Shell commands which override the default method for
|
|
.Ar argument .
|
|
.It Ar argument Ns Sy _precmd
|
|
Shell commands to run just before running
|
|
.Ar argument Ns Sy _cmd
|
|
or the default method for
|
|
.Ar argument .
|
|
If this returns a non-zero exit code, the main method is not performed.
|
|
If the default method is being executed, this check is performed after
|
|
the
|
|
.Sy required_*
|
|
checks and process (non-)existence checks.
|
|
.It Ar argument Ns Sy _postcmd
|
|
Shell commands to run if running
|
|
.Ar argument Ns Sy _cmd
|
|
or the default method for
|
|
.Ar argument
|
|
returned a zero exit code.
|
|
.It Sy sig_stop
|
|
Signal to send the processes to stop in the default
|
|
.Sy stop
|
|
method.
|
|
Defaults to
|
|
.Dv SIGTERM .
|
|
.It Sy sig_reload
|
|
Signal to send the processes to reload in the default
|
|
.Sy reload
|
|
method.
|
|
Defaults to
|
|
.Dv SIGHUP .
|
|
.El
|
|
.Pp
|
|
For a given method
|
|
.Ar argument ,
|
|
if
|
|
.Ar argument Ns Sy _cmd
|
|
is not defined, then a default method is provided by
|
|
.Sy run_rc_command :
|
|
.Bl -tag -width "argument" -offset indent
|
|
.It Sy Argument
|
|
.Sy Default method
|
|
.It Sy start
|
|
If
|
|
.Sy command
|
|
is not running and
|
|
.Ic checkyesno Sy rcvar
|
|
succeeds, start
|
|
.Sy command .
|
|
.It Sy stop
|
|
Determine the PIDs of
|
|
.Sy command
|
|
with
|
|
.Ic check_pidfile
|
|
or
|
|
.Ic check_process
|
|
(as appropriate),
|
|
.Ic kill Sy sig_stop
|
|
those PIDs, and run
|
|
.Ic wait_for_pids
|
|
on those PIDs.
|
|
.It Sy reload
|
|
Similar to
|
|
.Sy stop ,
|
|
except that it uses
|
|
.Sy sig_reload
|
|
instead, and doesn't run
|
|
.Ic wait_for_pids .
|
|
.It Sy restart
|
|
Runs the
|
|
.Sy stop
|
|
method, then the
|
|
.Sy start
|
|
method.
|
|
.It Sy status
|
|
Show the PID of
|
|
.Sy command ,
|
|
or some other script specific status operation.
|
|
.It Sy poll
|
|
Wait for
|
|
.Sy command
|
|
to exit.
|
|
.It Sy rcvar
|
|
Display which
|
|
.Xr rc.conf 5
|
|
variable is used (if any).
|
|
This method always works, even if the appropriate
|
|
.Xr rc.conf 5
|
|
variable is set to
|
|
.Sq NO .
|
|
.El
|
|
.Pp
|
|
The following variables are available to the methods
|
|
(such as
|
|
.Ar argument Ns Sy _cmd )
|
|
as well as after
|
|
.Ic run_rc_command
|
|
has completed:
|
|
.Bl -tag -width "rc_flags" -offset indent
|
|
.It Sy rc_arg
|
|
Argument provided to
|
|
.Sy run_rc_command ,
|
|
after fast and force processing has been performed.
|
|
.It Sy rc_flags
|
|
Flags to start the default command with.
|
|
Defaults to
|
|
.Sy ${name}_flags ,
|
|
unless overridden by the environment variable
|
|
.Sq Ev flags .
|
|
This variable may be changed by the
|
|
.Ar argument Ns Sy _precmd
|
|
method.
|
|
.It Sy rc_pid
|
|
PID of
|
|
.Sy command
|
|
(if appropriate).
|
|
.It Sy rc_fast
|
|
Not empty if
|
|
.Dq fast
|
|
prefix was used.
|
|
.It Sy rc_force
|
|
Not empty if
|
|
.Dq force
|
|
prefix was used.
|
|
.El
|
|
.It Ic run_rc_script Ar file Ar argument
|
|
Start the script
|
|
.Ar file
|
|
with an argument of
|
|
.Ar argument ,
|
|
and handle the return value from the script.
|
|
.Pp
|
|
Various shell variables are unset before
|
|
.Ar file
|
|
is started:
|
|
.Bd -ragged -offset indent
|
|
.Sy name ,
|
|
.Sy command ,
|
|
.Sy command_args ,
|
|
.Sy command_interpreter ,
|
|
.Sy extra_commands ,
|
|
.Sy pidfile ,
|
|
.Sy rcvar ,
|
|
.Sy required_dirs ,
|
|
.Sy required_files ,
|
|
.Sy required_vars ,
|
|
.Ar argument Ns Sy _cmd ,
|
|
.Ar argument Ns Sy _precmd .
|
|
.Ar argument Ns Sy _postcmd .
|
|
.Ed
|
|
.Pp
|
|
The startup behaviour of
|
|
.Ar file
|
|
depends upon the following checks:
|
|
.Bl -enum
|
|
.It
|
|
If
|
|
.Ar file
|
|
ends in
|
|
.Pa .sh ,
|
|
it is sourced into the current shell.
|
|
.It
|
|
If
|
|
.Ar file
|
|
appears to be a backup or scratch file
|
|
(e.g., with a suffix of
|
|
.Sq ~ ,
|
|
.Sq # ,
|
|
.Sq .OLD ,
|
|
or
|
|
.Sq .orig ) ,
|
|
ignore it.
|
|
.It
|
|
If
|
|
.Ar file
|
|
is not executable, ignore it.
|
|
.It
|
|
If the
|
|
.Xr rc.conf 5
|
|
variable
|
|
.Sy rc_fast_and_loose
|
|
is empty,
|
|
source
|
|
.Ar file
|
|
in a sub shell,
|
|
otherwise source
|
|
.Ar file
|
|
into the current shell.
|
|
.It
|
|
If
|
|
.Ar file
|
|
contains the
|
|
.Xr rcorder 8
|
|
keyword
|
|
.Dq interactive ,
|
|
then the command is executed using
|
|
.Ic no_rc_postprocess .
|
|
.El
|
|
.It Ic stop_boot
|
|
Prevent booting to multiuser mode.
|
|
If the
|
|
.Sy autoboot
|
|
variable is
|
|
.Sq yes ,
|
|
then a
|
|
.Sy SIGTERM
|
|
signal is sent to the parent
|
|
process (which is assumed to be
|
|
.Xr rc 8 ) .
|
|
Otherwise, the shell exits with status
|
|
.Li 1 .
|
|
.It Ic twiddle
|
|
Display one of the characters
|
|
.Sq \&/ , \&- , \&\e , \&| ,
|
|
followed by a backspace.
|
|
Repeated calls to this function will create the appearance of a spinning
|
|
symbol, as a different character is displayed on each call.
|
|
Output is to
|
|
.Pa /dev/tty ,
|
|
so this function may be useful even inside a script whose output
|
|
has been redirected.
|
|
.It Ic wait_for_pids Op Ar pid Op Ar ...
|
|
Wait until all of the provided
|
|
.Ar pids
|
|
don't exist any more, printing the list of outstanding
|
|
.Ar pids
|
|
every two seconds.
|
|
.It Ic warn Ar message
|
|
Display a warning message to
|
|
.Em stderr
|
|
and log it to the system log
|
|
using
|
|
.Xr logger 1 .
|
|
The warning message consists of the script name
|
|
(from
|
|
.Sy $0 ) ,
|
|
followed by
|
|
.Dq ": WARNING: " ,
|
|
and then
|
|
.Ar message .
|
|
.It Ic yesno_to_truefalse Ar var
|
|
Change the value of the specified variable from any of the
|
|
forms acceptable to the
|
|
.Ic checkyesno
|
|
function, to
|
|
.Dq true
|
|
or
|
|
.Dq false .
|
|
.El
|
|
.Sh FILES
|
|
.Bl -tag -width /etc/rc.subr -compact
|
|
.It Pa /etc/rc.subr
|
|
The
|
|
.Nm
|
|
file resides in
|
|
.Pa /etc .
|
|
.El
|
|
.Sh SEE ALSO
|
|
.Xr rc.conf 5 ,
|
|
.Xr rc 8
|
|
.Sh HISTORY
|
|
.Nm
|
|
appeared in
|
|
.Nx 1.3 .
|
|
The
|
|
.Xr rc.d 8
|
|
support functions appeared in
|
|
.Nx 1.5 .
|
|
Support for the
|
|
.Xr rc 8
|
|
post-processor appeared in
|
|
.Nx 6.0 .
|