sunos man page for bp_mapout

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

NAME
       bp_mapout - deallocate virtual address space

SYNOPSIS
       #include <sys/types.h>
       #include <sys/buf.h>

       void bp_mapout(struct buf *bp);

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

PARAMETERS
       bp	Pointer to the buffer header structure.

DESCRIPTION
       bp_mapout()  deallocates  system  virtual  address space allocated by a previous call to  bp_mapin(9F).bp_mapout() should only be called on
       buffers which have been allocated and are owned by the device driver. It must not be called on buffers  passed to the  driver  through  the
       strategy(9E)  entry  point  (for example a filesystem). Because bp_mapin(9F) does not keep a reference count, bp_mapout() will wipe out any
       kernel mapping that a layer above the device driver might rely on.

CONTEXT
       bp_mapout() can be called from user context only.

SEE ALSO
       strategy(9E), bp_mapin(9F), buf(9S)

       Writing Device Drivers

SunOS 5.10							    15 Nov 1996 						     bp_mapout(9F)