qreply(9r) [osf1 man page]

qreply(9r)																qreply(9r)

NAME

       qreply - STREAMS: Sends a message in the reverse direction

SYNOPSIS

       #include <sys/stream.h>

       void qreply(
	       queue_t *queue_pointer,
	       MBLKP message_ptr );

ARGUMENTS

       Specifies  a  pointer  to the queue. The typedef queue_t is an alternate name for struct queue_entry *.	Specifies a pointer to the message
       block to be sent in the opposite direction. The typedef MBLKP is an alternate name for typedef struct msgb *.

DESCRIPTION

       The qreply interface sends a message on a stream in the opposite direction from the queue specified in the queue_pointer argument. It calls
       the OTHERQ interface to find the queue's module partner.

RETURN VALUES

       None

SEE ALSO

       Kernel Interfaces: OTHERQ(9r), putnext(9r)

																	qreply(9r)

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

NAME

       qreply - send a message on a stream in the reverse direction

SYNOPSIS

       #include <sys/stream.h>

       void qreply(queue_t *q, mblk_t *mp);

INTERFACE LEVEL

       Architecture independent level 1 (DDI/DKI).

PARAMETERS

       q	Pointer to the queue.

       mp	Pointer to the message to be sent in the opposite direction.

DESCRIPTION

       qreply() sends messages in the reverse direction of normal flow. That is, qreply(q, mp) is equivalent to putnext(OTHERQ(q), mp).

CONTEXT

       qreply() can be called from user or interrupt context.

EXAMPLES

       Example 1: Canonical Flushing Code for STREAMS Drivers.

       This  example  depicts the canonical flushing code for STREAMS drivers.	Assume that the driver has service procedures so that there may be
       messages on its queues. See srv(9E). Its write-side put procedure handles M_FLUSH messages by first checking the FLUSHW bit  in	the  first
       byte of the message, then the write queue is flushed (line 8) and the  FLUSHW bit is turned off (line 9). See put(9E). If the
	FLUSHR	bit  is  on,  then  the read queue is flushed (line 12) and the message is sent back up the read side of the stream with the  qre-
       ply(9F) function (line 13). If the  FLUSHR bit is off, then the message is freed (line 15). See the example for	flushq(9F) for the canoni-
       cal flushing code for modules.

	1  xxxwput(q, mp)
	2    queue_t *q;
	3    mblk_t *mp;
	4  {
	5	switch(mp->b_datap->db_type) {
	6	case M_FLUSH:
	7	    if (*mp->b_rptr & FLUSHW) {
	8		   flushq(q, FLUSHALL);
	9		   *mp->b_rptr &= ~FLUSHW;
       10	      }
       11	    if (*mp->b_rptr & FLUSHR) {
       12		   flushq(RD(q), FLUSHALL);
       13		     qreply(q, mp);
       14	    } else {
       15		     freemsg(mp);
       16	      }
       17	    break;
		  . . .
       18     }
       19  }

SEE ALSO

       put(9E), srv(9E), flushq(9F), OTHERQ(9F), putnext(9F)

       Writing Device Drivers

	STREAMS Programming Guide

SunOS 5.10							    11 Apr 1991 							qreply(9F)