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vm_map_submap (9)

>> vm_map_submap (9) ( FreeBSD man: Ядро )

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NAME



vm_map_submap

 - create a subordinate map

SYNOPSIS

   #include <sys/param.h>
   #include <vm/vm.h>
   #include <vm/vm_map.h>
int Fo vm_map_submap Fa vm_map_t map vm_offset_t start vm_offset_t end vm_map_t submap Fc

DESCRIPTION

The vm_map_submap ();
function marks the range bounded by Fa start and Fa end within the map Fa map as being handled by a subordinate map Fa sub_map .

It is generally called by the kernel memory allocator.

IMPLEMENTATION NOTES

This function is for internal use only.

Both maps must exist. The range must have been created with vm_map_find9 previously.

No other operations may have been performed on this range before calling this function. Only the vm_fault ();
operation may be performed within this range after calling this function.

To remove a submapping, one must first remove the range from the parent Fa map , and then destroy the Fa sub_map . This procedure is not recommended.

RETURN VALUES

The vm_map_submap ();
function returns KERN_SUCCESS if successful.

Otherwise, it returns KERN_INVALID_ARGUMENT if the caller requested copy-on-write flags, or if the range specified for the sub-map was out of range for the parent map, or if a NULL backing object was specified.