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.\" $FreeBSD: head/share/man/man9/vm_map_check_protection.9 267936 2014-06-26 21:44:30Z bapt $
.\"
.Dd July 19, 2003
.Dt VM_MAP_CHECK_PROTECTION 9
.Os
.Sh NAME
.Nm vm_map_check_protection
.Nd check memory protection for a vm_map
.Sh SYNOPSIS
.In sys/param.h
.In vm/vm.h
.In vm/vm_map.h
.Ft boolean_t
.Fo vm_map_check_protection
.Fa "vm_map_t map" "vm_offset_t start" "vm_offset_t end" "vm_prot_t protection"
.Fc
.Sh DESCRIPTION
The
.Fn vm_map_check_protection
function asserts that the target
.Fa map
allows the specified privilege
.Fa protection
over the entire address range from
.Fa start
to
.Fa end .
The region MUST be contiguous; no holes are allowed.
.Sh IMPLEMENTATION NOTES
This code does not and SHOULD not check whether the contents of
the region are accessible.
For example, a small file may be mapped into an address space which
is significantly larger in size.
.Sh RETURN VALUES
The
.Fn vm_map_check_protection
function returns TRUE if the privilege is allowed; if it is not allowed,
or if any other error occurred, the value FALSE is returned.
.Sh SEE ALSO
.Xr munmap 2 ,
.Xr vm_map 9 ,
.Xr vm_map_protect 9
.Sh AUTHORS
This manual page was written by
.An Bruce M Simpson Aq Mt bms@spc.org .