AT&T UNIX™PC Unix System V Users Manual - tenox

MASTER ( 4) MASTER (4)
NAME
master - master device information table
DESCRIPTION
This file is used by the kernel to obtain device information. The
file consists of 3 parts, each separated by a line with a dollar sign
($) in column 1. Part 1 contains device information; part 2 contains
names of devices that have aliases; part 3 contains tunable
parameter information. Any line with an asterisk (*) in column 1
is treated as a comment.
Part 1 contains lines consisting of at least 6 fields, with the fields
delimited by tabs and/or blanks:
Field 1: device name (8 characters maximum).
Field 2: device mask (octal)-each "on" bit indicates
that the handler exists:
002000 info
001000 release
000400 strategy
000200 print
000100 initialization handler
000040 power-failure handler
000020 open handler
000010 close handler
000004 read handler
000002 write handler
000001 ioctl handler.
Field 3: device line discipline mask (octal)-each "on"
bit indicates that the handler exists:
000200 modem interrupt handler
000100 output handler
000040 input handler
000020 ioctl handler
000010 write handler
000004 read handler
000002 close handler
000001 open handler.
Field 4: device type indicator (octal):
000200 allow only one of these devices
000100 suppress count field in the conf.c
file
000040 suppress interrupt vector
000020 required device
000010 block device
000004 character device
000002 floating vector
000001 fixed vector.
Field 5: handler prefix (4 characters maximum).
Field 6: major device number for block-type device.
Field 7: major device number for character-type device.
Part 2 contains lines with 2 fields each:
- 1 -