pckt(7M)							  STREAMS Modules							  pckt(7M)

NAME

       pckt - STREAMS Packet Mode module

SYNOPSIS

       int ioctl( fd, I_PUSH, "pckt");

DESCRIPTION

       pckt  is  a  STREAMS  module  that  may be used with a pseudo terminal to packetize certain messages. The pckt module should be pushed (see
       I_PUSH on  streamio(7I)) onto the master side of a pseudo terminal.

       Packetizing is performed by prefixing a message with an	M_PROTO message. The original message type is stored in the 1 byte data portion of
       the M_PROTO message.

       On  the	read-side,  only  the  M_PROTO, M_PCPROTO, M_STOP,  M_START, M_STOPI, M_STARTI, M_IOCTL, M_DATA, M_FLUSH, and  M_READ messages are
       packetized. All other message types are passed upstream unmodified.

       Since all unread state information is held in the master's stream head read queue, flushing of this queue is disabled.

       On the write-side, all messages are sent down unmodified.

       With this module in place, all reads from the master side of the pseudo terminal should be performed with the  getmsg(2) or getpmsg() func-
       tion.  The control part of the message contains the message type. The data part contains the actual data associated with that message type.
       The onus is on the application to separate the data into its component parts.

SEE ALSO

       getmsg(2), ioctl(2), ldterm(7M), ptem(7M), streamio(7I), termio(7I)

       STREAMS Programming Guide

SunOS 5.11							    3 Jul 1990								  pckt(7M)