7e6cabd06e
Renumber cluase 4 to 3, per what everybody else did when BSD granted them permission to remove clause 3. My insistance on keeping the same numbering for legal reasons is too pedantic, so give up on that point. Submitted by: Jan Schaumann <jschauma@stevens.edu> Pull Request: https://github.com/freebsd/freebsd/pull/96
116 lines
3.5 KiB
Groff
116 lines
3.5 KiB
Groff
.\" Copyright (c) 1991, 1993
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.\" The Regents of the University of California. 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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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" @(#)mincore.2 8.1 (Berkeley) 6/9/93
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.\" $FreeBSD$
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.\"
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.Dd January 17, 2003
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.Dt MINCORE 2
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.Os
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.Sh NAME
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.Nm mincore
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.Nd determine residency of memory pages
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.Sh LIBRARY
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.Lb libc
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.Sh SYNOPSIS
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.In sys/mman.h
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.Ft int
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.Fn mincore "const void *addr" "size_t len" "char *vec"
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.Sh DESCRIPTION
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The
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.Fn mincore
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system call determines whether each of the pages in the region beginning at
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.Fa addr
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and continuing for
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.Fa len
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bytes is resident.
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.\"The beginning address,
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.\".Fa addr ,
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.\"is first rounded down to a multiple of the page size (see
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.\".Xr getpagesize 3 ) .
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.\"The end address,
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.\".Fa addr No + Fa len ,
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.\"is rounded up to a multiple of the page size.
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The status is returned in the
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.Fa vec
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array, one character per page.
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Each character is either 0 if the page is not resident, or a combination of
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the following flags (defined in
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.In sys/mman.h ) :
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.Bl -tag -width ".Dv MINCORE_REFERENCED_OTHER"
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.It Dv MINCORE_INCORE
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Page is in core (resident).
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.It Dv MINCORE_REFERENCED
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Page has been referenced by us.
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.It Dv MINCORE_MODIFIED
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Page has been modified by us.
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.It Dv MINCORE_REFERENCED_OTHER
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Page has been referenced.
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.It Dv MINCORE_MODIFIED_OTHER
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Page has been modified.
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.It Dv MINCORE_SUPER
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Page is part of a "super" page. (only i386 & amd64)
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.El
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.Pp
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The information returned by
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.Fn mincore
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may be out of date by the time the system call returns.
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The only way to ensure that a page is resident is to lock it into memory
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with the
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.Xr mlock 2
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system call.
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.Sh RETURN VALUES
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.Rv -std mincore
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.Sh ERRORS
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The
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.Fn mincore
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system call will fail if:
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.Bl -tag -width Er
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.It Bq Er ENOMEM
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The virtual address range specified by the
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.Fa addr
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and
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.Fa len
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arguments is not fully mapped.
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.It Bq Er EFAULT
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The
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.Fa vec
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argument points to an illegal address.
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.El
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.Sh SEE ALSO
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.Xr madvise 2 ,
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.Xr mlock 2 ,
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.Xr mprotect 2 ,
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.Xr msync 2 ,
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.Xr munmap 2 ,
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.Xr getpagesize 3
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.Sh HISTORY
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The
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.Fn mincore
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system call first appeared in
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.Bx 4.4 .
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