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.