| VM_MAP_LOOKUP(9) | Kernel Developer's Manual | VM_MAP_LOOKUP(9) |
vm_map_lookup,
vm_map_lookup_done — lookup
the vm_object backing a given virtual region
#include
<sys/param.h>
#include <vm/vm.h>
#include <vm/vm_map.h>
int
vm_map_lookup(vm_map_t *var_map,
vm_offset_t vaddr, vm_prot_t
fault_type, vm_map_entry_t *out_entry,
vm_object_t *object, vm_pindex_t
*pindex, vm_prot_t *out_prot,
boolean_t *wired);
void
vm_map_lookup_done(vm_map_t
map, vm_map_entry_t
entry);
The
vm_map_lookup()
function attempts to find the vm_object, page index
and protection, for the given virtual address vaddr,
in the map var_map, assuming a page fault of the type
fault_type had occurred.
Return values are guaranteed until
vm_map_lookup_done()
is called to release the lock.
The function vm_map_lookup() acquires a
read-lock on the map *var_map, but does not release
it. The caller should invoke vm_map_lookup_done() in
order to release this lock.
The vm_map_lookup() function returns
KERN_SUCCESS, and sets the
*object, *pindex,
*out_prot, and *out_entry
arguments appropriately for the hypothetical page fault.
This manual page was written by Bruce M Simpson <bms@spc.org>.
| July 19, 2003 | Debian |