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 5.10 7 Jul 1994 linkblk(9S)
