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.\" $FreeBSD: head/share/man/man9/vm_map_inherit.9 267936 2014-06-26 21:44:30Z bapt $
.\"
.Dd July 19, 2003
.Dt VM_MAP_INHERIT 9
.Os
.Sh NAME
.Nm vm_map_inherit
.Nd set fork inheritance flags for a range within a map
.Sh SYNOPSIS
.In sys/param.h
.In vm/vm.h
.In vm/vm_map.h
.Ft int
.Fo vm_map_inherit
.Fa "vm_map_t map" "vm_offset_t start" "vm_offset_t end"
.Fa "vm_inherit_t new_inheritance"
.Fc
.Sh DESCRIPTION
The
.Fn vm_map_inherit
function sets the inheritance flags for the range
.Fa start
to
.Fa end
within the target
.Fa map
to the value
.Fa new_inheritance .
.Pp
The
.Fa new_inheritance
flag must have one of the values
.Dv VM_INHERIT_NONE ,
.Dv VM_INHERIT_COPY ,
or
.Dv VM_INHERIT_SHARE .
This affects how the map will be shared with child maps when the
associated process forks.
.Sh IMPLEMENTATION NOTES
The
.Fn vm_map_inherit
function obtains a lock on the
.Fa map
using
.Xr vm_map_lock 9
for the duration of the function.
.Sh RETURN VALUES
The
.Fn vm_map_inherit
function returns
.Dv KERN_SUCCESS
if the inheritance flags could be set.
Otherwise, if the provided flags were invalid,
.Dv KERN_INVALID_ARGUMENT
will be returned.
.Sh SEE ALSO
.Xr fork 2
.Sh AUTHORS
This manual page was written by
.An Bruce M Simpson Aq Mt bms@spc.org .