1.\" $OpenBSD: minherit.2,v 1.13 2007/05/31 19:19:33 jmc Exp $ 2.\" 3.\" Copyright (c) 1991, 1993 4.\" The Regents of the University of California. All rights reserved. 5.\" 6.\" Redistribution and use in source and binary forms, with or without 7.\" modification, are permitted provided that the following conditions 8.\" are met: 9.\" 1. Redistributions of source code must retain the above copyright 10.\" notice, this list of conditions and the following disclaimer. 11.\" 2. Redistributions in binary form must reproduce the above copyright 12.\" notice, this list of conditions and the following disclaimer in the 13.\" documentation and/or other materials provided with the distribution. 14.\" 3. Neither the name of the University nor the names of its contributors 15.\" may be used to endorse or promote products derived from this software 16.\" without specific prior written permission. 17.\" 18.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 19.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 22.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 23.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 24.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 26.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28.\" SUCH DAMAGE. 29.\" 30.\" @(#)minherit.2 8.1 (Berkeley) 6/9/93 31.\" 32.Dd $Mdocdate: May 31 2007 $ 33.Dt MINHERIT 2 34.Os 35.Sh NAME 36.Nm minherit 37.Nd control the inheritance of pages 38.Sh SYNOPSIS 39.Fd #include <sys/types.h> 40.Fd #include <sys/mman.h> 41.Ft int 42.Fn minherit "void *addr" "size_t len" "int inherit" 43.Sh DESCRIPTION 44The 45.Fn minherit 46system call 47changes the specified pages to have the inheritance characteristic 48.Fa inherit , 49which can be set to 50.Dv MAP_INHERIT_NONE , 51.Dv MAP_INHERIT_COPY , 52or 53.Dv MAP_INHERIT_SHARE . 54Not all implementations will guarantee that the inheritance characteristic 55can be set on a page basis; 56the granularity of changes may be as large as an entire region. 57.Sh RETURN VALUES 58The 59.Fn minherit 60function returns the value 0 if successful; 61otherwise the value \-1 is returned and the global variable 62.Va errno 63is set to indicate the error. 64.Sh ERRORS 65The 66.Fn minherit 67system call will fail if: 68.Bl -tag -width Er 69.It Bq Er EINVAL 70The virtual address range specified by the 71.Fa addr 72and 73.Fa len 74arguments is not valid. 75.It Bq Er EACCES 76The flags specified by the 77.Fa inherit 78argument were not valid for the pages specified 79by the 80.Fa addr 81and 82.Fa len 83arguments. 84.El 85.Sh SEE ALSO 86.Xr madvise 2 , 87.Xr mincore 2 , 88.Xr mprotect 2 , 89.Xr msync 2 , 90.Xr munmap 2 91.Sh HISTORY 92The 93.Fn minherit 94function first appeared in 95.Ox 2.0 . 96