freebsd-nq/lib/libc/sys/minherit.2

.\"	$Id: minherit.2,v 1.5 1997/12/31 01:21:50 alex Exp $
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.\"	@(#)minherit.2	8.1 (Berkeley) 6/9/93
.\"
.Dd Feb 17, 1996
.Dt MINHERIT 2
.Os
.Sh NAME
.Nm minherit
.Nd control the inheritance of pages
.Sh SYNOPSIS
.Fd #include <sys/types.h>
.Fd #include <sys/mman.h>
.Ft int
.Fn minherit "void *addr" "size_t len" "int inherit"
.Sh DESCRIPTION
The
.Fn minherit
system call
changes the specified pages to have the inheritance characteristic
.Fa inherit .
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.
.Sh RETURN VALUES
Upon successful completion,
.Fn minherit
returns 0.  Otherwise, a value of -1 is returned and
.Va errno
is set to indicate the error.
.Sh ERRORS
The
.Fn minherit
function will fail if:
.Bl -tag -width Er
.It Bq Er EINVAL
The virtual address range specified by the
.Fa addr
and
.Fa len
arguments is not valid.
.It Bq Er EACCES
The flags specified by the
.Fa inherit
argument were not valid for the pages specified
by the
.Fa addr
and
.Fa len
arguments.
.El
.Sh SEE ALSO
.Xr fork 2 ,
.Xr madvise 2 , 
.Xr mincore 2 , 
.Xr mprotect 2 , 
.Xr msync 2 ,
.Xr munmap 2 ,
.Xr rfork 2
.Sh HISTORY
The
.Fn minherit
function first appeared in OpenBSD.