FreeBSD provide a nice tool to get various system information: sysctl(8)

Contents 1 FreeBSD ACPI interface for Lua 1.1 UPDATE: 2 How to Use 2.1 sysctl.get(key) 2.2 sysctl.set(key, newval) 2.3 sysctl.IK2celsius(kelv) 2.4 sysctl.IK2farenheit(kelv) 3 creating the ACPI Widget 3.1 Example

FreeBSD ACPI interface for Lua

System information under FreeBSD can be read using sysctl(8). I did write a sysctl(3) interface for lua, you can get it here.

UPDATE:

thanks to Renato Botelho, lua-sysctl is now in the FreeBSD port system :D

 cd /usr/ports/devel/lua-sysctl && make install clean

How to Use

sysctl.get(key)

returns two values. first returned value is the sysctl(3) value, second value is the format of returned value

• "I" int
• "UI" unsigned int
• "IK" int, in (kelv * 10) (used to get temperature)
• "L" long
• "UL" unsigned long
• "Q" quad_t
• "A" char *
• "T,dev_t" dev_t
• "S,clockinfo" struct clockinfo
• "S,loadavg" struct loadavg
• "S,timeval" struct timeval
• "S,vmtotal" struct vmtotal

sysctl.set(key, newval)

set the sysctl's key to newval. return nothin' and throw lua error if any problem occur.

sysctl.IK2celsius(kelv)

convert a sysctl's IK value into celsius and return it.

sysctl.IK2farenheit(kelv)

convert a sysctl's IK value into farenheit and return it.

creating the ACPI Widget

You need to load the library (in your rc.lua file). For example, if you have ~/.config/awesome/lib/sysctl/core.so and ~/.config/awesome/lib/sysctl.lua:

package.cpath = package.cpath .. ';' .. awful.util.getdir("config") .. '/lib/?.so'
require("lib/sysctl")

If you installed lua-sysctl via the port system, you don't need to tweak the package.cpath, and can require("sysctl")

And voilà! You can use sysctl.get() etc. to query sysctl and get any system information.

Example

You can check my config here for a complete example of use, and other user's config.

Have fun!