798 lines
22 KiB
Groff
798 lines
22 KiB
Groff
.\"
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.\" Copyright (c) 2002 M. Warner Losh <imp@FreeBSD.org>
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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. The name of the author may not be used to endorse or promote products
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.\" derived from this software without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" $FreeBSD$
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.\"
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.\" The section on comments was taken from named.conf.5, which has the
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.\" following copyright:
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.\" Copyright (c) 1999-2000 by Internet Software Consortium
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.\"
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.\" Permission to use, copy, modify, and distribute this software for any
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.\" purpose with or without fee is hereby granted, provided that the above
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.\" copyright notice and this permission notice appear in all copies.
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.\"
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.\" THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS
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.\" ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
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.\" OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE
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.\" CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
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.\" DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
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.\" PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
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.\" ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
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.\" SOFTWARE.
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.\"
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.Dd October 12, 2020
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.Dt DEVD.CONF 5
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.Os
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.Sh NAME
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.Nm devd.conf
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.Nd configuration file for
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.Xr devd 8
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.Sh DESCRIPTION
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.Ss General Syntax
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A
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.Xr devd 8
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configuration consists of two general features, statements
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and comments.
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All statements end with a semicolon.
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Many statements can contain substatements, which are also
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terminated with a semicolon.
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.Pp
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The following statements are supported:
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.Bl -tag -width ".Ic options"
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.It Ic attach
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Specifies various matching criteria and actions to perform when
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a newly attached device matches said criteria.
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.It Ic detach
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Specifies various matching criteria and actions to perform when
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a newly detached device matches said criteria.
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.It Ic nomatch
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Specifies various matching criteria and actions to perform when
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no device driver currently loaded in the kernel claims a (new)
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device.
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.It Ic notify
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Specifies various matching criteria and actions to perform when the kernel
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sends an event notification to userland.
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.It Ic options
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Specifies various options and parameters for the operation of
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.Xr devd 8 .
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.El
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.Pp
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Statements may occur in any order in the configuration file, and may be
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repeated as often as required.
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Further details on the syntax and meaning of each statement and their
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substatements are explained below.
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.Pp
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Each statement, except
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.Ic options
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has a priority (an arbitrary number) associated with it, where
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.Ql 0
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is defined as the lowest priority.
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If two statements match the same event, only the action of the statement with
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highest priority will be executed.
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In this way generic statements can be overridden for devices or
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notifications that require special attention.
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.Pp
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The general syntax of a statement is:
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.Bd -literal -offset indent
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statement priority {
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substatement "value";
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...
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substatement "value";
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};
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.Ed
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.Ss Sub-statements
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The following sub-statements are supported within the
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.Ic options
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statement.
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.Bl -tag -width ".Ic directory"
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.It Ic directory Qq Ar /some/path ;
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Adds the given directory to the list of directories from which
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.Xr devd 8
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will read all files named "*.conf" as further
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configuration files.
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Any number of
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.Ic directory
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statements can be used.
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.It Ic pid-file Qq Pa /var/run/devd.pid ;
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Specifies PID file.
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.It Ic set Ar regexp-name Qq Ar (some|regexp) ;
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Creates a regular expression and assigns it to the variable
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.Ar regexp-name .
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The variable is available throughout the rest of
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the configuration file.
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If the string begins with
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.Ql \&! ,
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it matches if the regular expression formed by the rest of the string
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does not match.
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All regular expressions have an implicit
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.Ql ^$
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around them.
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.El
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.Pp
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The following sub-statements are supported within the
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.Ic attach
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and
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.Ic detach
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statements.
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.Bl -tag -width ".Ic directory"
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.It Ic action Qq Ar command ;
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Command to execute upon a successful match.
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Example
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.Dq Li "/etc/pccard_ether $device-name start" .
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.It Ic class Qq Ar string ;
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This is shorthand for
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.Dq Ic match Qo Li class Qc Qq Ar string .
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.It Ic device-name Qq string ;
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This is shorthand for
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.Dq Ic match Qo Li device-name Qc Qq Ar string .
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This matches a device named
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.Ar string ,
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which is allowed to be a regular expression or a variable previously created
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containing a regular expression.
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The
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.Dq Li device-name
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variable
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is available for later use with the
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.Ic action
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statement.
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.It Ic match Qo Ar variable Qc Qq Ar value ;
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Matches the content of
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.Ar value
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against
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.Ar variable ;
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the content of
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.Ar value
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may be a regular expression.
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Not required during
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.Ic attach
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nor
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.Ic detach
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events since the
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.Ic device-name
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statement takes care of all device matching.
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For a partial list of variables, see below.
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.It Ic media-type Qq Ar string ;
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For network devices,
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.Ic media-type
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will match devices that have the given media type.
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Valid media types are:
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.Dq Li Ethernet ,
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.Dq Li Tokenring ,
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.Dq Li FDDI ,
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.Dq Li 802.11 ,
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and
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.Dq Li ATM .
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.It Ic subdevice Qq Ar string ;
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This is shorthand for
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.Dq Ic match Qo Li subdevice Qc Qq Ar string .
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.El
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.Pp
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The following sub-statements are supported within the
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.Ic nomatch
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statement.
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.Bl -tag -width ".Ic directory"
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.It Ic action Qq Ar command ;
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Same as above.
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.It Ic match Qo Ar variable Qc Qq Ar value ;
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Matches the content of
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.Ar value
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against
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.Ar variable ;
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the content of
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.Ar value
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may be a regular expression.
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For a partial list of variables, see below.
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.El
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.Pp
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The following sub-statements are supported within the
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.Ic notify
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statement.
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The
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.Dq Li notify
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variable is available inside this statement and contains, a value, depending
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on which system and subsystem that delivered the event.
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.Bl -tag -width ".Ic directory"
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.It Ic action Qq Ar command ;
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Command to execute upon a successful match.
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Example
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.Dq Li "/etc/rc.d/power_profile $notify" .
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.It Ic match Qo Ar system | subsystem | type | notify Qc Qq Ar value ;
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Any number of
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.Ic match
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statements can exist within a
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.Ic notify
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statement;
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.Ar value
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can be either a fixed string or a regular expression.
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Below is a list of available systems, subsystems, and types.
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.It Ic media-type Qq Ar string ;
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See above.
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.El
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.Ss Variables that can be used with the match statement
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A partial list of variables and their possible values that can be used together
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with the
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.Ic match
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statement.
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The variables are published by the bus based on characteristics of the device
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that generated the event (for device events).
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Variables for other classes of events are dependent on those events.
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.Pp
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.Bl -tag -width ".Li manufacturer" -compact
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.It Ic Variable
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.Ic Description
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.It Li *
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The entire message from the current event.
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.It Li _
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The entire message from the current event, after the initial type character.
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.It Li timestamp
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The time this event was processed, in seconds since 1970 dot fraction.
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.It Li bus
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Device name of parent bus.
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.It Li cdev
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Device node path if one is created by the
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.Xr devfs 5
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filesystem.
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.It Li class
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Device class.
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.It Li comm
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Executable name (kernel).
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.It Li core
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Path to core file (kernel).
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.It Li device
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Device ID.
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.It Li devclass
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Device Class (USB).
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.It Li devsubclass
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Device Sub-class (USB).
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.It Li device-name
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Name of attached/detached device.
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.It Li endpoints
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Endpoint count (USB).
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.It Li function
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Card functions.
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.It Li interface
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Interface ID (USB).
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.It Li intclass
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Interface Class (USB).
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.It Li intprotocol
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Interface Protocol (USB).
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.It Li intsubclass
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Interface Sub-class (USB).
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.It Li jail
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Jail name for the process triggering the rule (RCTL).
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.It Li mode
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Peripheral mode (USB).
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.It Li notify
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Match the value of the
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.Dq Li notify
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variable.
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.It Li parent
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Parent device.
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.It Li pid
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PID of the process triggering the rule (RCTL).
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.It Li port
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Hub port number (USB).
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.It Li product
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Product ID (USB).
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.It Li release
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Hardware revision (USB).
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.It Li ruid
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Real UID of the process triggering the rule (RCTL).
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.It Li rule
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Rule (RCTL).
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.It Li sernum
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Serial Number (USB).
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.It Li slot
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Card slot.
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.It Li subvendor
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Sub-vendor ID (PCI).
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.It Li subdevice
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Sub-device ID (PCI).
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.It Li subsystem
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Matches a subsystem of a system, see below.
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.It Li system
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Matches a system type, see below.
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.It Li type
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Type of notification, see below.
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.It Li vendor
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Vendor ID.
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.El
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.Ss Notify matching
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A partial list of systems, subsystems, and types used within the
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.Ic notify
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mechanism.
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.\"
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.\" Please keep these tables sorted. Also, please use the same parameters
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.\" for each of the tables so that things line up in columns nicely.
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.\" Please do not omit the type column for notifiers that omit it.
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.Pp
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.Bl -column "System" "Subsystem" "1234567" -compact
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.Sy "System" Ta Sy "Subsystem" Ta Sy "Type" Ta Sy "Description"
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.It Li ACPI Ta Ta Ta
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Events related to the ACPI Subsystem.
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.It Li ACPI Ta Li ACAD Ta Ta
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AC line state ($notify=0x00 is offline, 0x01 is online).
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.It Li ACPI Ta Li Button Ta Ta
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Button state ($notify=0x00 is power, 0x01 is sleep).
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.It Li ACPI Ta Li CMBAT Ta Ta
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Battery events.
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.It Li ACPI Ta Li Dock Ta Ta
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Dock state ($notify=0x00 is undocked, 0x01 is docked).
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.It Li ACPI Ta Li Lid Ta Ta
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Lid state ($notify=0x00 is closed, 0x01 is open).
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.It Li ACPI Ta Li PROCESSOR Ta Ta
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Processor state/configuration ($notify=0x81 is a change in available Cx states).
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.It Li ACPI Ta Li Resume Ta Ta
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Resume notification.
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.It Li ACPI Ta Li Suspend Ta Ta
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Suspend notification.
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.It Li ACPI Ta Li Thermal Ta Ta
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Thermal zone events.
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.El
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.Pp
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.Bl -column "System" "Subsystem" "1234567" -compact
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.Sy "System" Ta Sy "Subsystem" Ta Sy "Type" Ta Sy "Description"
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.It Li AEON Ta Li power Ta Li press Ta
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The power button on an Amiga has been pressed.
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.El
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.Pp
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.Bl -column "System" "Subsystem" "1234567" -compact
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.Sy "System" Ta Sy "Subsystem" Ta Sy "Type" Ta Sy "Description"
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.It Li CAM Ta Ta Ta
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Events related to the
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.Xr cam 4
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system.
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.It Li CAM Ta Li periph Ta Ta
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Events related to peripheral devices.
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.It Li CAM Ta Li periph Ta Li error Ta
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Generic errors.
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.It Li CAM Ta Li periph Ta Li timeout Ta
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Command timeouts.
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.El
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.Pp
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.Bl -column "System" "Subsystem" "1234567" -compact
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.Sy "System" Ta Sy "Subsystem" Ta Sy "Type" Ta Sy "Description"
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.It Li CARP Ta Ta Ta
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Events related to the
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.Xr carp 4
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protocol.
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.It CARP Ta Ar vhid@inet Ta Ta
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The
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.Dq subsystem
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contains the actual CARP vhid and the name of the network interface
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on which the event took place.
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.It CARP Ta Ar vhid@inet Ta MASTER Ta
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Node become the master for a virtual host.
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.It CARP Ta Ar vhid@inet Ta BACKUP Ta
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Node become the backup for a virtual host.
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.El
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.Pp
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.Bl -column "System" "Subsystem" "1234567" -compact
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.Sy "System" Ta Sy "Subsystem" Ta Sy "Type" Ta Sy "Description"
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.It Li coretemp Ta Ta Ta
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Events related to the
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.Xr coretemp 4
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device.
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.It Li coretemp Ta Li Thermal Ta Ta
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Notification that the CPU core has reached critical temperature.
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.It Li coretemp Ta Li Thermal Ta Li temperature Ta
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String containing the temperature of the core that has become too hot.
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.El
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.Pp
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.Bl -column "System" "Subsystem" "1234567" -compact
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.Sy "System" Ta Sy "Subsystem" Ta Sy "Type" Ta Sy "Description"
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.It Li DEVFS
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.It Li DEVFS Ta Li CDEV Ta Li CREATE Ta
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The
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.Xr devfs 5
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node is created.
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.It Li DEVFS Ta Li CDEV Ta Li DESTROY Ta
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The
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.Xr devfs 5
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node is destroyed.
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.El
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.Pp
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.Bl -column "System" "Subsystem" "1234567" -compact
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.Sy "System" Ta Sy "Subsystem" Ta Sy "Type" Ta Sy "Description"
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.It Li ETHERNET Ta Ar inet Ta IFATTACH Ta
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Notification when the default VNET instance of the
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.Em inet
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interface is attached.
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.El
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.Pp
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.Bl -column "System" "Subsystem" "1234567" -compact
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.Sy "System" Ta Sy "Subsystem" Ta Sy "Type" Ta Sy "Description"
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.It Li GEOM Ta Ta Ta
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Events related to the
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.Xr geom 4
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framework.
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The difference compared to
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.Li DEVFS
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is that
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.Li GEOM
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only includes disk-like devices.
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.It Li GEOM Ta Li DEV Ta Li CREATE Ta
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A
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.Xr geom 4
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provider is created.
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.It Li GEOM Ta Li DEV Ta Li DESTROY Ta
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A
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.Xr geom 4
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provider is destroyed.
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.It Li GEOM Ta Li DEV Ta Li GEOM::physpath Ta
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The physical path of a device has changed.
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.It Li GEOM Ta Li DEV Ta Li GEOM::rotation_rate Ta
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The rotation rate of the disk has changed.
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.It Li GEOM Ta Li DEV Ta Li MEDIACHANGE Ta
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Physical media has changed.
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.It Li GEOM Ta Li DEV Ta Li SIZECHANGE Ta
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A
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.Xr geom 4
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provider size has changed.
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.El
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.Pp
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.Bl -column "System" "Subsystem" "1234567" -compact
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.Sy "System" Ta Sy "Subsystem" Ta Sy "Type" Ta Sy "Description"
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.It Li IFNET
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.It Li IFNET Ta Em inet Ta Ta
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The
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.Dq subsystem
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is the actual name of the network interface on which the event
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took place.
|
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.It Li IFNET Ta Em inet Ta Li LINK_UP Ta
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Carrier status changed to UP.
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.It Li IFNET Ta Em inet Ta Li LINK_DOWN Ta
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Carrier status changed to DOWN.
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.It Li IFNET Ta Em inet Ta Li ATTACH Ta
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The network interface is attached to the system.
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.It Li IFNET Ta Em inet Ta Li DETACH Ta
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The network interface is detached from the system.
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.El
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.Pp
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.Bl -column "System" "Subsystem" "1234567" -compact
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.Sy "System" Ta Sy "Subsystem" Ta Sy "Type" Ta Sy "Description"
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.It Li kern Ta Li power Ta Li resume Ta
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|
Notification that the system has woken from the suspended state.
|
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Note: this notification is deprecated and will be removed in
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.Fx 14.0 .
|
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.El
|
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.Pp
|
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.Bl -column "System" "Subsystem" "1234567" -compact
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.Sy "System" Ta Sy "Subsystem" Ta Sy "Type" Ta Sy "Description"
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.It Li kernel Ta Li signal Ta Li coredump Ta
|
|
Notification that a process has crashed and dumped core.
|
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.It Li kernel Ta Li power Ta Li resume Ta
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|
Notification that the system has woken from the suspended state.
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.El
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.Pp
|
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.Bl -column "System" "Subsystem" "1234567" -compact
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.Sy "System" Ta Sy "Subsystem" Ta Sy "Type" Ta Sy "Description"
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.It Li PMU Ta Ta Ta
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|
Notification of events from various types of Power Management Units.
|
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.It Li PMU Ta Li "AC" Ta Ta
|
|
Notifications of AC power related events.
|
|
.It Li PMU Ta Li "AC" Ta Li overvoltage Ta
|
|
An over-voltage condition was detected on the AC power line.
|
|
.It Li PMU Ta Li "AC" Ta Li plugged Ta
|
|
Power has been applied to the AC power line.
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.It Li PMU Ta Li "AC" Ta Li unplugged Ta
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|
Power has been removed from the AC power line.
|
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.It Li PMU Ta Li Battery Ta Ta
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.It Li PMU Ta Li Battery Ta absent Ta
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|
Battery is no longer absent.
|
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.It Li PMU Ta Li Battery Ta charged Ta
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|
The battery has become charged.
|
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.It Li PMU Ta Li Battery Ta charging Ta
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The battery has started charging.
|
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.It Li PMU Ta Li Battery Ta disconnected Ta
|
|
The battery has been disconnected.
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.It Li PMU Ta Li Battery Ta high-temp Ta
|
|
The battery reported a temperature over the limit.
|
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.It Li PMU Ta Li Battery Ta low-temp Ta
|
|
The battery reported a temperature under the limit.
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.It Li PMU Ta Li Battery Ta plugged Ta
|
|
The battery has become plugged (eg connected).
|
|
.It Li PMU Ta Li Battery Ta shutdown-threshold Ta
|
|
The power in the battery has fallen below the shutdown threshold.
|
|
.It Li PMU Ta Li Battery Ta warning-threshold Ta
|
|
The power in the battery has fallen below the warn the user threshold.
|
|
.It Li PMU Ta Li Button Ta pressed Ta
|
|
A button on a
|
|
.Xr adb 4
|
|
or
|
|
.Xr pmu 4
|
|
has been pressed.
|
|
.It Li PMU Ta Li keys Ta Ta
|
|
One of the keys on the
|
|
.Xr adb 4
|
|
keyboard has been pressed.
|
|
.It Li PMU Ta Li keys Ta brightness Ta
|
|
A brightness level change has been requested.
|
|
Direction is in the $notify variable.
|
|
.It Li PMU Ta Li keys Ta mute Ta
|
|
The mute key
|
|
.It Li PMU Ta Li keys Ta volume Ta
|
|
A volume level change has been requested.
|
|
Direction is in the $notify variable.
|
|
.It Li PMU Ta Li keys Ta eject Ta
|
|
An ejection has been requested.
|
|
.It Li PMU Ta Li lid Ta close Ta
|
|
The
|
|
.Xr pmc 4
|
|
device has detected the lid closing.
|
|
.It Li PMU Ta Li lid Ta open Ta
|
|
The
|
|
.Xr pmc 4
|
|
device has detected the lid openinging.
|
|
.It Li PMU Ta Li POWER Ta ACLINE Ta
|
|
The
|
|
.Xr pmc 4
|
|
device has deteted an AC line state ($notify=0x00 is offline, 0x01 is online).
|
|
.It Li PMU Ta Li USB Ta overvoltage Ta
|
|
An over-voltage condition on the power lines for the USB power pins.
|
|
.It Li PMU Ta Li USB Ta plugged Ta
|
|
A device has been plugged into a USB device.
|
|
.It Li PMU Ta Li USB Ta undervoltage Ta
|
|
An under-voltage condition on the power lines for the USB power pins.
|
|
.It Li PMU Ta Li USB Ta unplugged Ta
|
|
A device has been unplugged into a USB device.
|
|
.El
|
|
.Pp
|
|
.Bl -column "System" "Subsystem" "1234567" -compact
|
|
.Sy "System" Ta Sy "Subsystem" Ta Sy "Type" Ta Sy "Description"
|
|
.It Li RCTL Ta Ta Ta
|
|
Events related to the
|
|
.Xr rctl 8
|
|
framework.
|
|
.It Li RCTL Ta Li rule Ta Li matched Ta
|
|
A rule with action specified as "devctl" was triggered.
|
|
.El
|
|
.Pp
|
|
.Bl -column "System" "Subsystem" "1234567" -compact
|
|
.Sy "System" Ta Sy "Subsystem" Ta Sy "Type" Ta Sy "Description"
|
|
.It Li USB Ta Ta Ta
|
|
Events related to the USB subsystem.
|
|
.It Li USB Ta Li DEVICE Ta Li ATTACH Ta
|
|
USB device is attached to the system.
|
|
.It Li USB Ta Li DEVICE Ta Li DETACH Ta
|
|
USB device is detached to the system.
|
|
.It Li USB Ta Li INTERFACE Ta Li ATTACH Ta
|
|
USB interface is attached to a device.
|
|
.It Li USB Ta Li INTERFACE Ta Li DETACH Ta
|
|
USB interface is detached from a device.
|
|
.El
|
|
.Pp
|
|
.Bl -column "System" "Subsystem" "1234567" -compact
|
|
.Sy "System" Ta Sy "Subsystem" Ta Sy "Type" Ta Sy "Description"
|
|
.It Li VFS Ta Ta Ta
|
|
Events from the vfs system.
|
|
.It Li VFS Ta Li FS Ta Ta
|
|
Events that change what is mounted to the system.
|
|
.It Li VFS Ta Li FS Ta Li MOUNT Ta
|
|
Notification of a filesystem is mounted for the first time.
|
|
.It Li VFS Ta Li FS Ta Li REMOUNT Ta
|
|
Notification of a filesystem is remounted (whether or not the options actually change).
|
|
.It Li VFS Ta Li FS Ta Li UNMOUNT Ta
|
|
Notification of a filesystem being unmounted.
|
|
.El
|
|
.Pp
|
|
.Bl -column "System" "Subsystem" "1234567" -compact
|
|
.Sy "System" Ta Sy "Subsystem" Ta Sy "Type" Ta Sy "Description"
|
|
.It Li ZFS Ta ZFS Ta Ta
|
|
Events about the ZFS subsystem.
|
|
See
|
|
.Xr zfsd 8
|
|
and
|
|
.Pa /etc/devd/zfs.conf
|
|
for details.
|
|
.El
|
|
.Pp
|
|
.\"
|
|
.\" End of tables
|
|
.\"
|
|
A link state change to UP on the interface
|
|
.Dq Li fxp0
|
|
would result in the following notify event:
|
|
.Bd -literal -offset indent
|
|
system=IFNET subsystem=fxp0 type=LINK_UP
|
|
.Ed
|
|
.Pp
|
|
An AC line state change to
|
|
.Dq offline
|
|
would result in the following event:
|
|
.Bd -literal -offset indent
|
|
system=ACPI subsystem=ACAD notify=0x00
|
|
.Ed
|
|
.Ss Comments
|
|
Comments may appear anywhere that whitespace may appear in a
|
|
configuration file.
|
|
To appeal to programmers of all kinds, they can
|
|
be written in C, C++, or shell/Perl constructs.
|
|
.Pp
|
|
C-style comments start with the two characters
|
|
.Ql /*
|
|
(slash, star) and end with
|
|
.Ql */
|
|
(star, slash).
|
|
Because they are completely delimited with these characters,
|
|
they can be used to comment only a portion of a line or to span
|
|
multiple lines.
|
|
.Pp
|
|
C-style comments cannot be nested.
|
|
For example, the following is
|
|
not valid because the entire comment ends with the first
|
|
.Ql */ :
|
|
.Bd -literal -offset indent
|
|
/* This is the start of a comment.
|
|
This is still part of the comment.
|
|
/* This is an incorrect attempt at nesting a comment. */
|
|
This is no longer in any comment. */
|
|
.Ed
|
|
.Pp
|
|
C++-style comments start with the two characters
|
|
.Ql //
|
|
(slash, slash) and continue to the end of the physical line.
|
|
They cannot be continued across multiple physical lines; to have
|
|
one logical comment span multiple lines, each line must use the
|
|
.Ql //
|
|
pair.
|
|
For example:
|
|
.Bd -literal -offset indent
|
|
// This is the start of a comment. The next line
|
|
// is a new comment, even though it is logically
|
|
// part of the previous comment.
|
|
.Ed
|
|
.Ss Notes on Variable Expansion
|
|
To prevent issues with special shell characters, the following happens for each
|
|
variable
|
|
.Ic $foo .
|
|
.Bl -enum
|
|
.It
|
|
The characters
|
|
.Dq $'
|
|
are inserted.
|
|
.It
|
|
The string
|
|
.Dq $foo
|
|
is removed.
|
|
.It
|
|
The value of the
|
|
.Ic foo
|
|
variable is inserted into the buffer with all single quote characters
|
|
prefixed by a backslash.
|
|
.El
|
|
.Pp
|
|
See
|
|
.Xr sh 1
|
|
for what this construct means.
|
|
It is safe in all context, except one: inside single quotes.
|
|
If foo=meta and bar=var, then a rule like the following:
|
|
.Bd -literal -offset indent -compact
|
|
action "echo '$foo $bar'";
|
|
.Ed
|
|
will be presented to the shell via
|
|
.Xr system 3
|
|
as
|
|
.Bd -literal -offset indent -compact
|
|
echo '$'meta' $'var''
|
|
.Ed
|
|
which produces the following output:
|
|
.Bd -literal -offset indent -compact
|
|
$meta $var
|
|
.Ed
|
|
as its output.
|
|
This is an unanticipated result.
|
|
A future version of this software will change this behavior.
|
|
Users are discouraged from using single quotes inside
|
|
.Ic action
|
|
value without due care.
|
|
.Pp
|
|
The above should be written as
|
|
.Bd -literal -offset indent -compact
|
|
action "echo $foo' '$bar"
|
|
.Ed
|
|
to produce a single argument to echo.
|
|
Given the above expansion, juxtaposing bare variables with
|
|
single quote expressions will produce the right output,
|
|
regardless of the value of the variable.
|
|
.Sh FILES
|
|
.Bl -tag -width ".Pa /etc/devd.conf" -compact
|
|
.It Pa /etc/devd.conf
|
|
The
|
|
.Xr devd 8
|
|
configuration file.
|
|
.El
|
|
.Sh EXAMPLES
|
|
.Bd -literal
|
|
#
|
|
# This will catch link down events on the interfaces fxp0 and ath0
|
|
#
|
|
notify 0 {
|
|
match "system" "IFNET";
|
|
match "subsystem" "(fxp0|ath0)";
|
|
match "type" "LINK_DOWN";
|
|
action "logger $subsystem is DOWN";
|
|
};
|
|
|
|
#
|
|
# Match lid open/close events
|
|
# These can be combined to a single event, by passing the
|
|
# value of $notify to the external script.
|
|
#
|
|
notify 0 {
|
|
match "system" "ACPI";
|
|
match "subsystem" "Lid";
|
|
match "notify" "0x00";
|
|
action "logger Lid closed, we can sleep now!";
|
|
};
|
|
|
|
notify 0 {
|
|
match "system" "ACPI";
|
|
match "subsystem" "Lid";
|
|
match "notify" "0x01";
|
|
action "logger Lid opened, the sleeper must awaken!";
|
|
};
|
|
|
|
#
|
|
# Match a USB device type
|
|
#
|
|
notify 0 {
|
|
match "system" "USB";
|
|
match "subsystem" "INTERFACE";
|
|
match "type" "ATTACH";
|
|
match "intclass" "0x0e";
|
|
action "logger USB video device attached";
|
|
};
|
|
|
|
#
|
|
# Try to configure ath and iwn devices with pccard_ether
|
|
# as they are attached.
|
|
#
|
|
attach 0 {
|
|
device-name "(ath|iwn)[0-9]+";
|
|
action "/etc/pccard_ether $device-name start";
|
|
};
|
|
|
|
#
|
|
# Stop ath and iwn devices as they are detached from
|
|
# the system.
|
|
#
|
|
detach 0 {
|
|
device-name "(ath|iwn)[0-9]+";
|
|
action "/etc/pccard_ether $device-name stop";
|
|
};
|
|
.Ed
|
|
.Pp
|
|
The installed
|
|
.Pa /etc/devd.conf
|
|
has many additional examples.
|
|
.Sh BUGS
|
|
The variable expansion's interaction with single quotes is
|
|
suboptimal and surprising.
|
|
.Sh SEE ALSO
|
|
.Xr cam 4 ,
|
|
.Xr coretemp 4 ,
|
|
.Xr devfs 5 ,
|
|
.Xr re_format 7 ,
|
|
.Xr devd 8
|