NAME

pkon, pkoff − establish packet protocol

SYNOPSIS

pkon(fd, size)

pkoff(fd)

DESCRIPTION

Pkon establishes packet protocol (see pk(4)) on the open character special file whose file descriptor is fd.  Size is a desired packet size, a power of 2 in the range 32≤size≤4096. The size is negotiated with a remote packet driver, and a possibly smaller actual packet size is returned.

An asynchronous line used for packet communication should be in raw mode; see tty(4).

Pkoff turns off the packet driver on the channel whose file descriptor is fd. 

SEE ALSO

pk(4), pkopen(3), tty(4), signal(2)

DIAGNOSTICS

Pkon returns −1 if fd does not describe an open file, or if packet communication cannot be established. 

Pkoff returns −1 for an unknown file descriptor. 

Writing on a packet driver link that has been shut down by close or pkoff at the other end raises signal SIGPIPE in the writing process. 

7th Edition