— nullmodem terminal driver
driver provides two tty(4)
connected by a virtual “null modem” cable.
If either of the two tty devices have the
”) set in their line
discipline, the nmdm
device will emulate the speed
configured in the termios(4)
settings. The speed emulation
works independently in the two directions, controlled by the slower end's
termios settings (c_ispeed
CS5 ... CS8
- nullmodem device nodes. Where the A node
has a matching B node.
driver implements “on-demand device
creation” so simply accessing a given instance in /dev
will create it.
driver first appeared in FreeBSD