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linkblk(9s) [opensolaris man page]

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)

Check Out this Related Man Page

WR(9F)							   Kernel Functions for Drivers 						    WR(9F)

NAME
WR, wr - get pointer to the write queue for this module or driver SYNOPSIS
#include <sys/stream.h> #include <sys/ddi.h> queue_t *WR(queue_t *q); INTERFACE LEVEL
Architecture independent level 1 (DDI/DKI). PARAMETERS
q Pointer to the read queue whose write queue is to be returned. DESCRIPTION
The WR() function accepts a read queue pointer as an argument and returns a pointer to the write queue of the same module. CAUTION: Make sure the argument to this function is a pointer to a read queue. WR() will not check for queue type, and a system panic could result if the pointer is not to a read queue. RETURN VALUES
The pointer to the write queue. CONTEXT
WR() can be called from user or interrupt context. EXAMPLES
Example 1: Using WR() In a STREAMS close(9E) routine, the driver or module is passed a pointer to the read queue. These usually are set to the address of the module-specific data structure for the minor device. 1 xxxclose(q, flag) 2 queue_t *q; 3 int flag; 4 { 5 q->q_ptr = NULL; 6 WR(q)->q_ptr = NULL; . . . 7 } SEE ALSO
close(9E), OTHERQ(9F), RD(9F) Writing Device Drivers STREAMS Programming Guide SunOS 5.10 15 Nov 1991 WR(9F)
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