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Whitespace fix, noted by John Hawkinson.
2000-08-05 00:03:07 +04:00
.\" $NetBSD: minherit.2,v 1.8 2000/08/04 20:03:07 wiz Exp $
import minherit from OpenBSD
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.\"
.\" Copyright (c) 1991, 1993
.\" The Regents of the University of California. 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.
.\" 3. All advertising materials mentioning features or use of this software
.\" must display the following acknowledgement:
.\" This product includes software developed by the University of
.\" California, Berkeley and its contributors.
.\" 4. Neither the name of the University nor the names of its contributors
.\" may be used to endorse or promote products derived from this software
.\" without specific prior written permission.
.\"
.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.
.\"
.\" @(#)minherit.2 8.1 (Berkeley) 6/9/93
.\"
.Dd June 9, 1993
.Dt MINHERIT 2
.Os
.Sh NAME
.Nm minherit
.Nd control the inheritance of pages
Add a LIBRARY section to system call manual pages. While it's clear that the libraries contain stubs only (with minor exceptions a la pipe(2)), the purpose of this section is to provide linkage information.
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.Sh LIBRARY
.Lb libc
import minherit from OpenBSD
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.Sh SYNOPSIS
.Fd #include <sys/mman.h>
.Ft int
caddr_t -> void * PR/4269: Chris Demetriou: Add MS_* to msync()
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.Fn minherit "void *addr" "size_t len" "int inherit"
import minherit from OpenBSD
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.Sh DESCRIPTION
The
Explain what this function actually does
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.Fn minherit
import minherit from OpenBSD
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system call
Explain what this function actually does
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changes the specified range of virtual addresses to have the specified
fork-time inheritance characteristic
punctuation fix (. -> ,)
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.Fa inherit ,
Rename VM_INHERIT_* to MAP_INHERIT_* and move them to sys/sys/mman.h as discussed on tech-kern. Retire sys/uvm/uvm_inherit.h, update man page for minherit(2).
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which can be set to
.Dv MAP_INHERIT_NONE ,
Whitespace fix, noted by John Hawkinson.
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.Dv MAP_INHERIT_COPY ,
Rename VM_INHERIT_* to MAP_INHERIT_* and move them to sys/sys/mman.h as discussed on tech-kern. Retire sys/uvm/uvm_inherit.h, update man page for minherit(2).
2000-08-01 04:53:07 +04:00
or
.Dv MAP_INHERIT_SHARE .
Also possible is
.Dv MAP_INHERIT_DEFAULT ,
which defaults to
.Dv MAP_INHERIT_COPY .
import minherit from OpenBSD
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Not all implementations will guarantee that the inheritance characteristic
can be set on a page basis;
the granularity of changes may be as large as an entire region.
Explain what this function actually does
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.Pp
Rename VM_INHERIT_* to MAP_INHERIT_* and move them to sys/sys/mman.h as discussed on tech-kern. Retire sys/uvm/uvm_inherit.h, update man page for minherit(2).
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Normally, the entire address space is marked
.Dv MAP_INHERIT_COPY ;
when the process calls
Explain what this function actually does
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.Fn fork ,
the child receives a (virtual) copy of the entire address space.
Rename VM_INHERIT_* to MAP_INHERIT_* and move them to sys/sys/mman.h as discussed on tech-kern. Retire sys/uvm/uvm_inherit.h, update man page for minherit(2).
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Pages or regions marked
.Dv MAP_INHERIT_SHARE
are shared between the address spaces, while pages or regions marked
.Dv MAP_INHERIT_NONE
will be unmapped in the child.
Explain what this function actually does
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.Sh BUGS
If the a particular port does not support page-granularity
inheritance, there's no way to figure out how large a region is
actually affected by
.Fn minherit .
import minherit from OpenBSD
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.Sh SEE ALSO
Explain what this function actually does
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.Xr fork 2 ,
import minherit from OpenBSD
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.Xr madvise 2 ,
.Xr mincore 2 ,
.Xr mprotect 2 ,
.Xr msync 2 ,
.Xr munmap 2
.Sh HISTORY
The
.Fn minherit
function first appeared in
.Bx Open .