backq man page on DigitalUNIX

backq man page on DigitalUNIX

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backq(9r)							     backq(9r)

NAME
       backq - STREAMS: Gets a pointer to the previous queue

SYNOPSIS
       #include <sys/stream.h>

       queue_t * backq(
	       queue_t *current_queue );

ARGUMENTS
       Specifies  the  pointer to the current queue. The typedef queue_t is an
       alternate name for struct queue_entry *.

DESCRIPTION
       The backq interface returns a pointer to the queue preceding  the  cur‐
       rent  queue  (the  current_queue	 argument).  If the current queue is a
       read queue, backq returns a pointer to the queue	 downstream  from  the
       current	queue, unless the current queue is the stream end. If the cur‐
       rent queue is a write queue, backq  returns  a  pointer	to  the	 queue
       upstream from the current queue, unless the current queue is the stream
       head.

RETURN VALUES
       Upon successful completion, the backq interface returns	a  pointer  to
       the queue preceding the current queue. Otherwise, it returns NULL.

SEE ALSO
       Programmer's Guide: STREAMS

								     backq(9r)

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