Data Structures for Drivers                           linkblk(9S)



NAME
     linkblk - STREAMS data structure sent to multiplexor drivers
     to indicate a link

SYNOPSIS
     #include 


INTERFACE LEVEL
     Architecture independent level 1 (DI/DKI)

DESCRIPTION
     The  linkblk structure is used to connect a lower Stream  to
     an  upper   STREAMS  multiplexor  driver.  This structure is
     used in conjunction with the ILINK, IUNLINK,  PLINK,  and
     PUNLINK ioctl commands. See  streamio(7I). The  MDATA por-
     tion of the  MIOCTL message contains  the   linkblk  struc-
     ture.  Note that the linkblk structure is allocated and ini-
     tialized by the Stream head as a result of  one of the above
     ioctl commands.

STRUCTURE MEMBERS
       queuet   *lqtop;   /* lowest level write queue of upper stream */
                            /* (set to NUL for persistent links) */
       queuet   *lqbot;   /* highest level write queue of lower stream */
       int       lindex;   /* index for lower stream. */


SEE ALSO
     ioctl(2), streamio(7I)


     STREAMS Programming Guide






















SunOS 5.11           Last change: 7 Jul 1994                    1