1PKON(2)                       System Calls Manual                      PKON(2)
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NAME

6       pkon, pkoff - establish packet protocol
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SYNOPSIS

9       pkon(fd, size)
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11       pkoff(fd)
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DESCRIPTION

14       Pkon establishes packet protocol (see pk(4)) on the open character spe‐
15       cial file whose file descriptor is fd.  Size is a desired packet  size,
16       a  power of 2 in the range 32≤size≤4096.  The size is negotiated with a
17       remote packet driver, and a possibly  smaller  actual  packet  size  is
18       returned.
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20       An  asynchronous  line  used  for packet communication should be in raw
21       mode; see tty(4).
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23       Pkoff turns off the packet driver on the channel whose file  descriptor
24       is fd.
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SEE ALSO

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

30       Pkon returns -1 if fd does not describe an open file, or if packet com‐
31       munication cannot be established.
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33       Pkoff returns -1 for an unknown file descriptor.
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35       Writing on a packet driver link that has been shut  down  by  close  or
36       pkoff at the other end raises signal SIGPIPE in the writing process.
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