VM_MAP_FINDSPACE(9) BSD Kernel Developer's Manual VM_MAP_FINDSPACE(9)NAMEvm_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_size_t align, int flags, 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 with
the alignment align. The flags parameter can be:
MAP_STACK
The space returned is for stack regions and can intersect the
stack address space.
IMPLEMENTATION NOTES
It is the caller's responsibility to obtain a lock on the map before
calling this function.
This routine may call pmap_growkernel() 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; other‐
wise, the value 1 is returned.
AUTHORS
This manual page was written by Bruce M Simpson ⟨bms@spc.org⟩.
BSD December 8, 2010 BSD
