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VM_MAP_FINDSPACE (9) | Kernel routines | Unix Manual Pages | :man

NAME

vm_map_findspace - find a free region within a map

CONTENTS

Synopsis
Description
Implementation Notes
Return Values
See Also
Authors

SYNOPSIS


.In sys/param.h
.In vm/vm.h
.In vm/vm_map.h int
.Fo vm_map_findspace "vm_map_t map" "vm_offset_t start" "vm_size_t length" "vm_offset_t *addr"
.Fc

DESCRIPTION

The vm_map_findspace function attempts to find a region with sufficient space in the map for an object of size length at the address addr.

IMPLEMENTATION NOTES

It is the caller’s responsibility to obtain a lock on the map using vm_map_lock(9) before calling this function.

This routine may call pmap_growkernel(9) to grow the kernel’s address space, if and only if the mapping is being made within the kernel address space, and if insufficient space remains in the kernel_map.

RETURN VALUES

The vm_map_findspace function returns the value 0 if successful, and *addr will contain the first virtual address in the found region; otherwise, the value 1 is returned.

SEE ALSO

pmap_growkernel(9), vm_map(9), vm_map_entry_resize_free(9), vm_map_lock(9)

AUTHORS


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