Kernel Functions for Drivers                               RD(9F)



NAME
     RD, rd - get pointer to the read queue

SYNOPSIS
     #include 
     #include 



     queuet *RD(queuet *q);


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

PARAMETERS
     q    Pointer to the write queue whose read queue  is  to  be
          returned.


DESCRIPTION
     The RD() function accepts a write queue pointer as an  argu-
     ment  and  returns  a  pointer to the read queue of the same
     module.


     CAUTION: Make sure  the  argument  to  this  function  is  a
     pointer  to  a  write  queue.  RD() will not check for queue
     type, and a system panic could result if it is not the right
     type.

RETURN VALUES
     The pointer to the read queue.

CONTEXT
     The RD() function can be called  from  user,  interrupt,  or
     kernel context.

EXAMPLES
     Example 1 Function page reference


     See the qreply(9F) function page for an example of RD().


SEE ALSO
     qreply(9F), WR(9F)


     Writing Device Drivers





SunOS 5.11          Last change: 16 Jan 2006                    1






Kernel Functions for Drivers                               RD(9F)



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SunOS 5.11          Last change: 16 Jan 2006                    2