NetBSD/usr.sbin/apmd/apmd.8

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.\" by John Kohl.
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.Dd March 20, 2010
.Dt APMD 8
.Os
.Sh NAME
.Nm apmd
.Nd Advanced Power Management monitor daemon
.Sh SYNOPSIS
.Nm
.Op Fl adlqsv
.Op Fl f Ar devname
.Op Fl m Ar sockmode
.Op Fl o Ar sockowner:sockgroup
.Op Fl S Ar sockname
.Op Fl t Ar rate
.Sh DESCRIPTION
The
.Nm
daemon monitors the Advanced Power Management
.Pq Tn APM
pseudo-device, acting on
signaled events and upon user requests as sent by the
.Xr apm 8
utility.
The
.Nm
daemon is only installed on supported platforms.
.Pp
.Em The
.Nm
.Em is largely deprecated.
Modern systems supporting
.Tn ACPI
should rely on
.Xr acpi 4 ,
.Xr powerd 8 ,
and the
.Xr envsys 4
framework instead.
.Pp
For suspend and standby request events delivered by the BIOS, or via
.Xr apm 8 ,
.Nm
runs the appropriate configuration program (if one exists),
syncs the buffer cache to disk and initiates the requested mode.
When resuming after suspend or standby,
.Nm
runs the appropriate configuration utility (if one exists).
For power status change events,
.Nm
fetches the current status and reports it via
.Xr syslog 3
with logging facility
.Dv LOG_DAEMON .
.Pp
.Nm
announces the transition to standby mode with a single high tone on the
speaker (using the
.Pa /dev/speaker
device).
Suspends are announced with two high tones.
.Pp
.Nm
periodically polls the
.Tn APM
driver for the current power state.
If the battery charge level changes substantially or the external power
status changes, the new status is logged.
The polling rate defaults to
once per 10 minutes, but this may be altered by using the
.Fl t
command-line flag.
.Pp
.Nm
supports the following options:
.Bl -tag -width Fl
.It Fl a
Any BIOS-initiated suspend or standby requests are
ignored if the system is connected to line current and not running from
batteries (user requests are still honored).
.It Fl d
Enter debug mode, log to facility
.Dv LOG_LOCAL1
and stay in the foreground on the controlling terminal.
.It Fl f Ar devname
Specify an alternate device file name.
.It Fl l
A low-battery event causes a suspend request to occur.
.It Fl m Ar sockmode
Use
.Ar sockmode
instead of
.Sq 0660
for the mode of
.Pa /var/run/apmdev .
.It Fl o Ar sockowner:sockgroup
Use
.Ar sockowner:sockgroup
instead of
.Sq `0:0'
for the owner/group of
.Pa /var/run/apmdev .
.It Fl q
Do not announce suspend and standby requests on the speaker.
.It Fl S Ar sockname
Specify an alternate socket name (used by
.Xr apm 8
to communicate with
.Nm ) .
.It Fl s
The current battery statistics are reported via
.Xr syslog 3
and exit without monitoring the APM status.
.It Fl t Ar rate
Change the polling rate from 600 seconds to
.Ar rate
seconds.
.It Fl v
Periodically log the power status via
.Xr syslog 3 .
.El
.Pp
When a client requests a suspend or stand-by mode,
.Nm
does not wait for positive confirmation that the requested
mode has been entered before replying to the client; to do so would mean
the client does not get a reply until the system resumes from its sleep state.
Rather,
.Nm
replies with the intended state to the client and then places the system
in the requested mode after running the configuration script and
flushing the buffer cache.
.Pp
Actions can be configured for the five transitions:
.Cm suspend ,
.Cm standby ,
.Cm resume ,
.Cm line
or
.Cm battery .
The suspend and standby actions are run prior to
.Nm
performing any other actions (such as disk syncs) and entering the new
mode.
The resume program is run after resuming from a stand-by or suspended state.
.Pp
The line and battery actions are run after switching power sources to
AC (line) or battery, respectively.
The appropriate line or battery action
is also run upon the startup of apmd based on the current power source.
.Sh FILES
.Bl -tag -width /etc/apm/suspend -compact
.It Pa /etc/apm/suspend
.It Pa /etc/apm/standby
.It Pa /etc/apm/resume
.It Pa /etc/apm/line
.It Pa /etc/apm/battery
Contain the host's customized actions.
Each file must be an executable binary or shell script suitable
for execution by the
.Xr execve 2
function.
If you wish to have the same program or script control all transitions, it
may determine which transition is in progress by examining its
.Va argv[0]
which is set to one of
.Ar suspend ,
.Ar standby ,
.Ar resume ,
.Ar line
or
.Ar battery .
See
.Pa /usr/share/examples/apm/script
for such an example script.
.Pp
.It Pa /var/run/apmdev
The default UNIX-domain socket used for communication with
.Xr apm 8 .
The socket is protected by default to mode 0660, UID 0, GID 0.
.Pp
.It Pa /dev/apmctl
The default device used to control the APM kernel driver.
.El
.Sh SEE ALSO
.Xr execve 2 ,
.Xr syslog 3 ,
.Xr apm 4 ,
.Xr speaker 4 ,
.Xr apm 8 ,
.Xr syslogd 8
.Sh HISTORY
The
.Nm
daemon appeared in
.Nx 1.3 .