An optional argument
flags
may be supplied with the device specification
in the config file indicating
that the line corresponding to
bit number
i
is not properly
connected, and should be treated as hard-wired with carrier
always present. Thus specifying
`flags 0x04'
for
dz0
would cause line
tty02
to be treated in this way.
Normal I/O control parameters for individual lines are managed by ioctl(2) calls. Line speeds may be initiated via the ttys(5) file, stty(1) or ifconfig(8) to name a few, see tty(4).
The dz driver monitors the rate of input on each board, and switches between the use of character-at-a-time interrupts and input silos. While the silo is enabled during periods of high-speed input, the driver polls for input 30 times per second.
/dev/tty[0-9][0-9]
/dev/ttyd[0-9a-f]
AT&T UNIX
.