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linkblk(9S)						    Data Structures for Drivers 					       linkblk(9S)

NAME
       linkblk - STREAMS data structure sent to multiplexor drivers to indicate a link

SYNOPSIS
       #include <sys/stream.h>

INTERFACE LEVEL
       Architecture independent level 1 (DDI/DKI)

DESCRIPTION
       The   linkblk  structure  is used to connect a lower Stream to an upper	STREAMS multiplexor driver.  This structure is used in conjunction
       with the I_LINK, I_UNLINK,  P_LINK, and P_UNLINK ioctl commands. See  streamio(7I). The	M_DATA portion of the	M_IOCTL  message  contains
       the   linkblk  structure.  Note that the linkblk structure is allocated and initialized by the Stream head as a result of  one of the above
       ioctl commands.

STRUCTURE MEMBERS
	 queue_t   *l_qtop;   /* lowest level write queue of upper stream */
			      /* (set to NULL for persistent links) */
	 queue_t   *l_qbot;   /* highest level write queue of lower stream */
	 int	   l_index;   /* index for lower stream. */

SEE ALSO
       ioctl(2), streamio(7I)

       STREAMS Programming Guide

SunOS 5.11							    7 Jul 1994							       linkblk(9S)