man(1) Manual page archive


     PKON(2)                                                   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 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.