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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 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

     This manual page was written by Bruce M Simpson 〈bms@spc.org〉.