freebsd-dev/usr.sbin/apmd/apmd.8

.\" Copyright (c) 1999 Mitsuru IWASAKI <iwasaki@FreeBSD.org>
.\" Copyright (c) 1999 KOIE Hidetaka <koie@suri.co.jp>
.\" Copyright (c) 1999 Yoshihiko SARUMARU Aq <mistral@imasy.or.jp>
.\" Copyright (c) 1999 Norihiro Kumagai <kuma@nk.rim.or.jp>
.\" All rights reserved.
.\"
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.\"     @(#)apmd.8	1.1 (FreeBSD) 6/28/99
.\" $FreeBSD$
.\"
.Dd June 28, 1999
.Dt APMD 8
.Os
.Sh NAME
.Nm apmd
.Nd Advanced Power Management monitor daemon
.Sh SYNOPSIS
.Nm
.Op Fl d
.Op Fl f file
.Op Fl s
.Op Fl v
.Sh DESCRIPTION
The
.Nm
utility
monitors the occurrence of the specified Advanced Power Management
.Pq Tn APM
events and, if one of the events occurs, it executes the sequence of
commands corresponding to the event.  Only the events specified in the
configuration file are notified to
.Nm ;
all other events are ignored.  For each event posted by the APM BIOS,
.Nm
invokes the sequence of commands specified in the configuration file.
When
.Nm
is running with monitoring suspend/standby requests,
the kernel will not process those requests.
Therefore, if you wish action to be taken when these events
occur, you need to explicitly configure the appropriate commands or
built-in functions in the configuration file.
.Pp
The
.Nm
utility recognizes the following runtime options:
.Bl -tag -width -f_file
.It Fl d
Starts in debug mode.  This causes
.Nm
to execute in the foreground instead of in daemon mode.
.It Fl f Ar file
Specifies a different configuration file
.Ar file
to be used in place of the default
.Pa /etc/apmd.conf .
.It Fl s
Causes
.Nm
to simulate a POWERSTATECHANGE event when a power state change is detected
(AC_POWER_STATE) but the bios of the laptop doesn't report it.
This enables you to do things like dimming the LCD backlight when you unplug
the power cord.
.It Fl v
Verbose mode.
.El
.Pp
When
.Nm
starts, it reads the configuration file
.Pa ( /etc/apmd.conf
as default)
and notifies the set of events to be monitored to the APM device driver.
When it terminates, the APM device driver automatically cancels
monitored events.
.Pp
If the
.Nm
process receives a SIGHUP, it will reread its configuration file and
notify the APM device driver of any changes to its configuration.
.Pp
The
.Nm
utility uses the device
.Pa /dev/apmctl
to issue
.Xr ioctl 2
requests for monitoring events and for controlling the APM system.
This device file is opened exclusively, so only a single
.Nm
process can be running at any time.
.Pp
When
.Nm
receives an APM event, it forks a child process to execute the
commands specified in the configuration file and then continues
listening for more events.  The child process executes the commands
specified, one at a time and in the order that they are listed.
.Pp
While
.Nm
is processing the command list for SUSPEND/STANDBY requests, the APM kernel
device driver issues notifications to APM BIOS once per second so that the
BIOS knows that there are still some commands pending, and that it should not
complete the request just yet.
.Pp
The
.Nm
utility creates the file
.Pa /var/run/apmd.pid ,
and stores its process
id there.
This can be used to kill or reconfigure
.Nm .
.Sh CONFIGURATION FILE
The structure of the
.Nm
configuration file is quite simple.  For example:
.Pp
.Bd -literal
apm_event SUSPENDREQ {
       exec "sync && sync && sync";
       exec "sleep 1";
       exec "zzz";
}
.Ed
.Pp
will cause
.Nm
to receive the APM event
.Ql SUSPENDREQ
(which may be posted by an LCD close), run the
.Ql sync
command 3 times and wait for a while, then execute
.Nm zzz ( Ns Nm apm Fl z )
to put the system in the suspend state.
.Pp
.Bl -bullet
.It
The  apm_event keyword
.Bd -ragged -offset indent
.Ql apm_event
is the keyword which indicates the start of configuration for
each events.
.Ed
.It
APM events
.Bd -ragged -offset indent
If you wish to execute the same commands for different events, the
event names should be delimited by a comma.  The following are
valid event names:
.Bl -item
.It
- Events ignored by the kernel if
.Nm
is running:
.Pp
.Bl -tag -width USERSUSPENDREQ -compact -offset indent
.It STANDBYREQ
.It USERSTANDBYREQ
.It SUSPENDREQ
should include sync in the command list,
.It USERSUSPENDREQ
should include sync in the command list,
.It BATTERYLOW
only zzz should be specified in the command list.
.El
.It
- Events passed to
.Nm
after kernel handling:
.Pp
.Bl -tag -width USERSUSPENDREQ -compact -offset indent
.It NORMRESUME
.It CRITRESUME
.It STANDBYRESUME
.It POWERSTATECHANGE
.It UPDATETIME
.It CAPABILITIESCHANGE
.El
.Pp
Other events will not be sent to
.Nm .
.El
.Ed
.It
command line syntax
.Bd -ragged -offset indent
In the example above, the three lines beginning with
.Ql exec
are commands for the event.
Each line should be terminated with a semicolon.
The command list for the event should be enclosed by
.Ql {
and
.Ql } .
The
.Nm
utility uses
.Pa /bin/sh
for double-quotation enclosed command execution, just as with
.Xr system 3 .
Each command is executed in order until the end of
the list is reached or a command finishes with a non-zero status code.
The
.Nm
utility will report any failed command's status code via
.Xr syslog 3
and will then reject the request event posted by the APM BIOS.
.Ed
.It
Built-in functions
.Bd -ragged -offset indent
You can also specify
.Nm
built-in functions instead of command lines.
A built-in function name should be terminated with a semicolon,
just as with a command line.
The following built-in functions are currently supported:
.Bl -item
.It
- reject:
.Bd -ragged -offset indent
Reject last request posted by APM BIOS.  This can be used to reject
a SUSPEND request when the LCD is closed and put the system in a
STANDBY state instead.
.Ed
.El
.Ed
.El
.Sh EXAMPLES
Sample configuration commands include:
.Bd -literal
apm_event SUSPENDREQ {
        exec "/etc/rc.suspend";
}

apm_event USERSUSPENDREQ {
        exec "sync && sync && sync";
        exec "sleep 1";
        exec "apm -z";
}

apm_event NORMRESUME, STANDBYRESUME {
        exec "/etc/rc.resume";
}

# resume event configuration for serial mouse users by
# reinitializing a moused(8) connected to a serial port.
#
#apm_event NORMRESUME {
#       exec "kill -HUP `cat /var/run/moused.pid`";
#}
#
# suspend request event configuration for ATA HDD users:
# execute standby instead of suspend.
#
#apm_event SUSPENDREQ {
#       reject;
#       exec "sync && sync && sync";
#       exec "sleep 1";
#       exec "apm -Z";
#}
.Ed
.Sh FILES
.Bl -tag -width /etc/apmd.conf -compact
.It Pa /etc/apmd.conf
.It Pa /dev/apmctl
.It Pa /var/run/apmd.pid
.El
.Sh SEE ALSO
.Xr apm 4 ,
.Xr apm 8
.Sh AUTHORS
.An Mitsuru IWASAKI Aq iwasaki@FreeBSD.org
.An KOIE Hidetaka Aq koie@suri.co.jp
.Pp
Some contributions made by
.An Warner Losh Aq imp@FreeBSD.org ,
.An Hiroshi Yamashita Aq bluemoon@msj.biglobe.ne.jp ,
.An Yoshihiko SARUMARU Aq mistral@imasy.or.jp ,
.An Norihiro Kumagai Aq kuma@nk.rim.or.jp ,
.An NAKAGAWA Yoshihisa Aq nakagawa@jp.FreeBSD.org ,
and
.An Nick Hilliard Aq nick@foobar.org .
.Sh HISTORY
The
.Nm
utility appeared in
.Fx 3.3 .