2003-09-30 00:51:31 +00:00
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.\"
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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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.\" 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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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" $FreeBSD$
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.\"
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.Dd July 19, 2003
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2004-07-06 06:53:42 +00:00
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.Dt VM_MAP_INHERIT 9
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2004-07-06 07:02:31 +00:00
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.Os
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2003-09-30 00:51:31 +00:00
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.Sh NAME
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.Nm vm_map_inherit
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.Nd set fork inheritance flags for a range within a 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 int
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2004-07-06 06:53:42 +00:00
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.Fo vm_map_inherit
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.Fa "vm_map_t map" "vm_offset_t start" "vm_offset_t end"
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.Fa "vm_inherit_t new_inheritance"
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.Fc
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2003-09-30 00:51:31 +00:00
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.Sh DESCRIPTION
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The
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.Fn vm_map_inherit
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function sets the inheritance flags for the range
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.Fa start
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to
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.Fa end
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within the target
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.Fa map
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to the value
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.Fa new_inheritance .
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.Pp
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The
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.Fa new_inheritance
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flag must have one of the values
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.Dv VM_INHERIT_NONE ,
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.Dv VM_INHERIT_COPY ,
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or
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.Dv VM_INHERIT_SHARE .
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This affects how the map will be shared with child maps when the
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associated process forks.
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.Sh IMPLEMENTATION NOTES
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The
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2004-07-06 06:53:42 +00:00
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.Fn vm_map_inherit
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2003-09-30 00:51:31 +00:00
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function obtains a lock on the
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.Fa map
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using
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.Xr vm_map_lock 9
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for the duration of the function.
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.Sh RETURN VALUES
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The
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.Fn vm_map_inherit
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function returns
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.Dv KERN_SUCCESS
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if the inheritance flags could be set.
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Otherwise, if the provided flags were invalid,
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.Dv KERN_INVALID_ARGUMENT
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will be returned.
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.Sh SEE ALSO
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.Xr fork 2
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.Sh AUTHORS
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2005-06-28 20:15:19 +00:00
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This manual page was written by
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2003-09-30 00:51:31 +00:00
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.An Bruce M Simpson Aq bms@spc.org .
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