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PKON(2)                       System Calls Manual                      PKON(2)



NAME
       pkon, pkoff - establish packet protocol

SYNOPSIS
       pkon(fd, size)

       pkoff(fd)

DESCRIPTION
       Pkon establishes packet protocol (see pk(4)) on the open character spe-
       cial 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 com-
       munication 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.



                                                                       PKON(2)