pckt man page on DigitalUNIX

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pckt(7)								       pckt(7)

NAME
       pckt - STREAMS module for constructing message packets on a pty

DESCRIPTION
       The  pckt module is a STREAMS module that can be used with a pseudoter‐
       minal to transfer messages in packet mode. The packet mode  feature  of
       pty devices allows the user process on the master side of the device to
       be informed of state changes.

       For packet mode to be enabled in the pty device, the user process  must
       push the pckt module onto the master side of the pty with a call to the
       STREAMS I_PUSH ioctl() function.

       When the user process writes data, the pckt module passes  the  message
       on  to the next module or driver unchanged. When the user process reads
       data or when the pckt module receives certain STREAMS message types, it
       constructs a packet out of the message for forwarding upstream.

       To  construct  a message packet, the module creates an M_PROTO message.
       This M_PROTO message contains the original message type	in  the	 first
       data  block  and the original message in as many data blocks as needed.
       The user process can then retrieve the M_PROTO message with a  call  to
       the getmsg() function.

       The  STREAMS  message types that the pckt module places in packets, are
       the following:

       M_DATA
       M_IOCTL
       M_PROTO
       M_PCPROTO
       M_FLUSH
       M_START
       M_STOP
       M_STARTI
       M_STOPI
       M_READ

       All other messages are passed unchanged upstream.

       If the message is an M_FLUSH message, the pckt module looks at the flag
       and  takes  the	following  actions:  If the flag is FLUSHW, the module
       changes it to FLUSHR before creating the M_PROTO	 message,  and	passes
       the message upstream. The module also sends an M_FLUSH message with the
       FLUSHW flag set.	 If the flag is	 FLUSHR,  the  module  changes	it  to
       FLUSHW  before  creating	 the  M_PROTO  message, and passes the message
       upstream.  If the flag is FLUSHRW, the  module  changes	it  to	FLUSHW
       before  creating	 the M_PROTO message, and passes the message upstream.
       The module also sends an M_FLUSH message with the FLUSHW flag set.

SEE ALSO
       Functions: getmsg(2), ioctl(2)

       Interfaces: ldterm(7), ptem(7), streamio(7)

								       pckt(7)
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