APM(8)APM(8)
NAME
apm – Advanced Power Management 1.2 BIOS interface
SYNOPSIS
(in plan9.ini)
apm0=
bind -a ’#P’ /dev
aux/apm
[
-d
device
]
[
-m
mountpoint
]
[
-s
service
]
DESCRIPTION
Aux/apm
presents at
mountpoint
(default
/mnt/apm)
an interface to the APM 1.2 BIOS
(see
apm(3))
device
(the default is to try
/dev/apm,
followed by
#P/apm).
If a
service
is specified, the interface will be
posted at
/srv/service
as well.
The directory contains the following files.
battery
Contains one line for each battery in the system.
Each line lists three fields: the status (a string, one of
unknown,
high,
low,
critical,
or
charging),
the percent charge remaining, and
an estimate of the amount of time left in seconds.
If either or both of the last two are unknown,
the corresponding field will be zero.
ctl
The
ctl
file is used to set power management modes for
various parts of the system.
Control messages are of the form
“device verb ,”
where
device
is one of
system,
display,
storage,
lpt,
eia,
network,
and
pcmcia,
and
verb is one of
enable,
disable,
standby,
off
and
on.
Enable
and
disable
control whether power management is active
for the device, while
standby
puts the device into standby mode
and
on
brings it back to full power.
event
Reads from this file will block until an APM event
has occurred.
A large enough read is guaranteed to return
an integral number of textual event descriptions, one per line.
SOURCE
/sys/src/cmd/aux/apm.c
/acme/bin/Battery
BUGS
The verbs
suspend
and
off
should be supported but doing so requires
nontrivial help from the kernel.
SEE ALSO
acpi(8)