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