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wr(9f) [freebsd 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)

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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