NAME    [Toc]    [Back]

       backq - STREAMS: Gets a pointer to the previous queue

SYNOPSIS    [Toc]    [Back]

       #include <sys/stream.h>

       queue_t * backq(
               queue_t *current_queue );

ARGUMENTS    [Toc]    [Back]

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

DESCRIPTION    [Toc]    [Back]

       The backq interface returns a pointer to the queue preceding
  the  current  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 current 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    [Toc]    [Back]

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

SEE ALSO    [Toc]    [Back]

       Programmer's Guide: STREAMS



                                                        backq(9r)