Provided by: freebsd-manpages_8.2-1_all
vm_map_find — find a free region within a map, and optionally map a
vm_map_find(vm_map_t map, vm_object_t object, vm_ooffset_t offset,
vm_offset_t *addr, vm_size_t length, int find_space, vm_prot_t prot,
vm_prot_t max, int cow);
The vm_map_find() function attempts to find a free region in the target
map, with the given length, and will also optionally create a mapping of
The arguments offset, prot, max, and cow are passed unchanged to
vm_map_insert(9) when creating the mapping, if and only if a free region
If object is non-NULL, the reference count on the object must be
incremented by the caller before calling this function to account for the
If find_space is either VMFS_ALIGNED_SPACE or VMFS_ANY_SPACE, the
function will call vm_map_findspace(9) to discover a free region.
Moreover, if find_space is VMFS_ALIGNED_SPACE, the address of the free
region will be optimized for the use of superpages. Otherwise, if
find_space is VMFS_NO_SPACE, vm_map_insert(9) is called with the given
This function acquires a lock on map by calling vm_map_lock(9), and holds
it until the function returns.
The search for a free region is defined to be first-fit, from the address
The vm_map_find() function returns KERN_SUCCESS if the mapping was
successfully created. If space could not be found or find_space was
VMFS_NO_SPACE and the given address, addr, was already mapped,
KERN_NO_SPACE will be returned. If the discovered range turned out to be
bogus, KERN_INVALID_ADDRESS will be returned.
vm_map(9), vm_map_findspace(9), vm_map_insert(9), vm_map_lock(9)
This manual page was written by Bruce M Simpson ⟨firstname.lastname@example.org⟩.