msgb man page on OSF1

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msgb(4)								       msgb(4)

NAME
       msgb - Defines a STREAMS message block

SYNOPSIS
       #include <sys/stream.h>

       struct msgb(
	       struct msgb *b_next,
	       struct msgb *b_prev,
	       struct msgb *b_cont,
	       unsigned char *b_rptr,
	       unsigned char *b_wptr,
	       struct datab *b_datap,
	       MSG_KERNEL_FIELDS );

PARAMETERS
       A  pointer to the next message on the queue.  A pointer to the previous
       message on the queue.  A pointer to the next message block in the  mes‐
       sage.   A  pointer  to  the  first  unread  data byte in the buffer.  A
       pointer to the first unwritten data byte in the buffer.	A  pointer  to
       the  datab  structure  (data block) that contains the data for the mes‐
       sage.  Additional fields that  are  visible  within  the	 kernel.   The
       fields included and their contents depend on the kernel configuration.

DESCRIPTION
       The  msgb  structure  defines a message block.  A message block carries
       data or information in a stream.	 A STREAMS message consists of message
       blocks linked through b_cont. Each message block points to a data block
       descriptor, which in turn points to a data buffer.

       The msgb structure is typedefed as mblk_t. The associated data block is
       stored in a datab structure, which is typedefed as dblk_t.

       The datab structure is defined (in sys/stream.h) as:

       struct datab {
	       struct datab *  db_freep;
	       unsigned char * db_base;
	       unsigned char * db_lim;
	       unsigned char   db_ref;
	       unsigned char   db_type;
	       unsigned char   db_class;
	       unsigned char   db_pad[1]; };

       The datab fields are defined as follows: Used internally by the STREAMS
       memory allocator.  The first byte of the buffer.	 The last byte of  the
       buffer,	plus  one.   The  number of message blocks ( struct msgb) that
       reference this data block.  The message type.  Used  internally.	  Pad‐
       ding.

       Messages	 are  typed according to the value in the db_type field in the
       associated datab structure.  Some possible type values are: The message
       contains ordinary data.	The message contains internal control informa‐
       tion and data.

       As part of its support for STREAMS, Tru64 UNIX provides	the  following
       interfaces  for exchanging messages betweens STREAMS modules on the one
       hand and sockets and network protocols on the other:  mbuf_to_mblk()  -
       Converts	 an  mbuf  chain to an mblk chain mblk_to_mbuf() - Converts an
       mblk chain to an mbuf chain

								       msgb(4)
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