68 lines
2.4 KiB
Groff
68 lines
2.4 KiB
Groff
.\"
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.\" Copyright (c) 2003 Bruce M Simpson <bms@spc.org>
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.\" All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" $FreeBSD$
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.\"
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.Dd July 19, 2003
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.Dt vm_map_check_protection 9
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.Sh NAME
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.Nm vm_map_check_protection
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.Nd check memory protection for a vm_map
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.Sh SYNOPSIS
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.In sys/param.h
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.In vm/vm.h
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.In vm/vm_map.h
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.Ft boolean_t
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.Fn vm_map_check_protection "vm_map_t map" "vm_offset_t start" "vm_offset_t end" "vm_prot_t protection"
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.Sh DESCRIPTION
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The
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.Fn vm_map_check_protection
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function asserts that the target
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.Fa map
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allows the specified privilege
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.Fa protection
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over the entire address range from
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.Fa start
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to
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.Fa end .
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The region MUST be contiguous; no holes are allowed.
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.Sh IMPLEMENTATION NOTES
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This code does not and SHOULD not check whether the contents of
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the region are accessible.
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For example, a small file may be mapped into an address space which
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is significantly larger in size.
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.Sh RETURN VALUES
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The
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.Fn vm_map_check_protection
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function returns TRUE if the privilege is allowed; if it is not allowed,
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or if any other error occurred, the value FALSE is returned.
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.Sh SEE ALSO
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.Xr munmap 2 ,
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.Xr vm_map 9 ,
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.Xr vm_map_protect 9
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.Sh AUTHORS
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This man page was written by
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.An Bruce M Simpson Aq bms@spc.org .
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