getq man page on SunOS

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

NAME
       getq - get the next message from a queue

SYNOPSIS
       #include <sys/stream.h>

       mblk_t *getq(queue_t *q);

INTERFACE LEVEL
       Architecture independent level 1 (DDI/DKI).

PARAMETERS
       q	Pointer	 to  the  queue	 from  which  the  message  is	to  be
		retrieved.

DESCRIPTION
       The getq() function is used by a service ( srv(9E)) routine to retrieve
       its enqueued messages.

       A  module  or  driver may include a service routine to process enqueued
       messages. Once the STREAMS scheduler calls srv() it  must  process  all
       enqueued messages, unless prevented by flow control. getq() obtains the
       next available message from the top of the queue pointed to  by	q.  It
       should  be called in a while loop that is exited only when there are no
       more messages or flow control prevents further processing.

       If an attempt was made to write to the queue while it  was  blocked  by
       flow  control,  getq() back-enables (restarts) the service routine once
       it falls below the low water mark.

RETURN VALUES
       If there is a message to retrieve, getq() returns a pointer to  it.  If
       no message is queued, getq() returns a NULL pointer.

CONTEXT
       The  getq() function can be called from user, interrupt, or kernel con‐
       text.

EXAMPLES
       See dupb(9F).

SEE ALSO
       srv(9E), bcanput(9F), canput(9F), dupb(9F), putbq(9F),  putq(9F),  qen‐
       able(9F)

       Writing Device Drivers

       STREAMS Programming Guide

SunOS 5.10			  16 Jan 2006			      getq(9F)
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