vm_map_findspace.9 revision 135841
Copyright (c) 2003 Bruce M Simpson <bms@spc.org>
All rights reserved.
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THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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$FreeBSD: head/share/man/man9/vm_map_findspace.9 135841 2004-09-27 05:44:28Z alc $
.Dd July 19, 2003 .Dt VM_MAP_FINDSPACE 9 .Os .Sh NAME .Nm vm_map_findspace .Nd find a free region within a map .Sh SYNOPSIS n sys/param.h n vm/vm.h n vm/vm_map.h .Ft int .Fo vm_map_findspace .Fa "vm_map_t map" "vm_offset_t start" "vm_size_t length" "vm_offset_t *addr" .Fc .Sh DESCRIPTION The .Fn vm_map_findspace function attempts to find a region with sufficient space in the .Fa map for an object of size .Fa length at the address .Fa addr . .Sh IMPLEMENTATION NOTES It is the caller's responsibility to obtain a lock on the .Fa map using .Xr vm_map_lock 9 before calling this function.
Copyright (c) 2003 Bruce M Simpson <bms@spc.org>
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:
1. Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution.
THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
SUCH DAMAGE.
$FreeBSD: head/share/man/man9/vm_map_findspace.9 135841 2004-09-27 05:44:28Z alc $
.Dd July 19, 2003 .Dt VM_MAP_FINDSPACE 9 .Os .Sh NAME .Nm vm_map_findspace .Nd find a free region within a map .Sh SYNOPSIS n sys/param.h n vm/vm.h n vm/vm_map.h .Ft int .Fo vm_map_findspace .Fa "vm_map_t map" "vm_offset_t start" "vm_size_t length" "vm_offset_t *addr" .Fc .Sh DESCRIPTION The .Fn vm_map_findspace function attempts to find a region with sufficient space in the .Fa map for an object of size .Fa length at the address .Fa addr . .Sh IMPLEMENTATION NOTES It is the caller's responsibility to obtain a lock on the .Fa map using .Xr vm_map_lock 9 before calling this function.
p This routine may call .Xr 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 .Va kernel_map . .Sh RETURN VALUES The .Fn vm_map_findspace function returns the value 0 if successful, and .Fa *addr will contain the first virtual address in the found region; otherwise, the value 1 is returned. .Sh SEE ALSO .Xr pmap_growkernel 9 , .Xr vm_map 9 , .Xr vm_map_entry_resize_free 9 , .Xr vm_map_lock 9 .Sh AUTHORS This man page was written by .An Bruce M Simpson Aq bms@spc.org .