'\" te
.\" Copyright (c) 2000, Sun Microsystems, Inc.,  All Rights Reserved
.TH linkblk 9S "7 Jul 1994" "SunOS 5.11" "Data Structures for Drivers"
.SH NAME
linkblk \- STREAMS data structure sent to multiplexor drivers to indicate a link
.SH SYNOPSIS
.LP
.nf
#include <sys/stream.h> 
.fi

.SH INTERFACE LEVEL
.sp
.LP
Architecture independent level 1 (DDI/DKI)
.SH DESCRIPTION
.sp
.LP
The  \fBlinkblk\fR structure is used to connect a lower Stream to an upper  STREAMS multiplexor driver.  This structure is used in conjunction with the \fBI_LINK\fR, \fBI_UNLINK\fR,  \fBP_LINK\fR, and \fBP_UNLINK\fR ioctl commands. See  \fBstreamio\fR(7I). The  \fBM_DATA\fR portion of the  \fBM_IOCTL\fR message contains the  \fBlinkblk\fR structure.  Note that the \fBlinkblk\fR structure is allocated and initialized by the Stream head as a result of  one of the above ioctl commands.
.SH STRUCTURE MEMBERS
.sp
.in +2
.nf
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. */
.fi
.in -2

.SH SEE ALSO
.sp
.LP
\fBioctl\fR(2), \fBstreamio\fR(7I) 
.sp
.LP
\fISTREAMS Programming Guide\fR