VM_MAP_LOOKUP(9) BSD Kernel Developer's Manual VM_MAP_LOOKUP(9)NAME
vm_map_lookup, vm_map_lookup_done -- lookup the vm_object backing a given virtual region
SYNOPSIS
#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);
DESCRIPTION
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.
IMPLEMENTATION NOTES
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.
RETURN VALUES
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.
SEE ALSO vm_map(9)AUTHORS
This manual page was written by Bruce M Simpson <bms@spc.org>.
BSD July 19, 2003 BSD
Check Out this Related Man Page
VM_MAP_PROTECT(9) BSD Kernel Developer's Manual VM_MAP_PROTECT(9)NAME
vm_map_protect -- apply protection bits to a virtual memory region
SYNOPSIS
#include <sys/param.h>
#include <vm/vm.h>
#include <vm/vm_map.h>
int
vm_map_protect(vm_map_t map, vm_offset_t start, vm_offset_t end, vm_prot_t new_prot, boolean_t set_max);
DESCRIPTION
The vm_map_protect() function sets the protection bits of the address region bounded by start and end within the map map to new_prot.
If set_max is TRUE, new_prot is treated as the new max_protection setting for each underlying entry. Otherwise, only the protection field is
affected.
The range MUST be contiguous, and MUST NOT contain sub-maps.
IMPLEMENTATION NOTES
The function acquires a lock on the map for the duration, by calling vm_map_lock(9).
RETURN VALUES
The vm_map_protect() function returns KERN_SUCCESS if the protection bits could be set successfully.
If a sub-map entry was encountered in the range, KERN_INVALID_ARGUMENT is returned. If the value of new_prot would exceed max_protection for
an entry within the range, KERN_PROTECTION_FAILURE is returned.
SEE ALSO vm_map(9)AUTHORS
This manual page was written by Bruce M Simpson <bms@spc.org>.
BSD July 19, 2003 BSD
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