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Full Discussion: HP-UX 10.20 devices
Operating Systems HP-UX HP-UX 10.20 devices Post 14662 by Perderabo on Monday 4th of February 2002 03:47:27 PM
Old 02-04-2002
On HP-UX 10.20, both /dev/zero and /dev/null have the same major number. That means that the same exact driver is invoked when either file is opened. That driver will look at the minor number which is how it know to behave differently. This driver is a psuedo-driver since it controls no hardware.

A read to /dev/null returns end of file.

A read to /dev/zero succeeds and returns all zeroes.
 

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LEARN ABOUT FREEBSD

acpi_sony

ACPI_SONY(4)						   BSD Kernel Interfaces Manual 					      ACPI_SONY(4)

NAME

     acpi_sony -- ACPI notebook controller driver for Sony laptops

SYNOPSIS

     To compile this driver into the kernel, place the following line in your kernel configuration file:

	   device acpi_sony

     Alternatively, to load the driver as a module at boot time, place the following line in loader.conf(5):

	   acpi_sony_load="YES"

DESCRIPTION

     The acpi_sony driver provides support for the notebook controller in Sony laptops.  Note that not all features will work on all laptop mod-
     els.

SYSCTLS

     The following sysctl nodes are currently implemented:

     dev.acpi_sony.0.brightness
	     Current brightness level of the display.

     dev.acpi_sony.0.brightness_default
	     Default brightness level of the display (survives reboot).

     dev.acpi_sony.0.contrast
	     Current contrast level of the display.

     dev.acpi_sony.0.bass_gain
	     Enable or disable the Bass Gain feature.

     dev.acpi_sony.0.cdp
	     Turns the CD power on or off.

     dev.acpi_sony.0.azp
	     Turns the audio power on or off.

     dev.acpi_sony.0.lnp
	     Turns the wired network interface power on or off.

SEE ALSO

     acpi(4), sysctl(8)

HISTORY

     The acpi_sony driver first appeared in FreeBSD 6.0.

AUTHORS

     The acpi_sony driver was written by Takanori Watanabe <takawata@FreeBSD.org>.

BSD
								 February 8, 2010							       BSD
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