vm_map_findspace(9)

NAME

vm_map_findspace - find a free region within a map

SYNOPSIS

#include <sys/param.h>
#include <vm/vm.h>
#include <vm/vm_map.h>
int
vm_map_findspace(vm_map_t map, vm_offset_t start,  vm_size_t
length,
        vm_offset_t *addr);

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 ker

nel'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 suc

cessful, 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

This manual page was written by Bruce M Simpson

<bms@spc.org>.

BSD July 19, 2003

BSD