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	1	.\" $NetBSD: mincore.2,v 1.7 1995/10/12 15:41:05 jtc 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. All advertising materials mentioning features or use of this software
	15	.\" must display the following acknowledgement:
	16	.\" This product includes software developed by the University of
	17	.\" California, Berkeley and its contributors.
	18	.\" 4. Neither the name of the University nor the names of its contributors
	19	.\" may be used to endorse or promote products derived from this software
	20	.\" without specific prior written permission.
	21	.\"
	22	.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
	23	.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	24	.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	25	.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
	26	.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	27	.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	28	.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	29	.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	30	.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	31	.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	32	.\" SUCH DAMAGE.
	33	.\"
	34	.\" @(#)mincore.2 8.1 (Berkeley) 6/9/93
	35	.\"
	36	.Dd June 9, 1993
	37	.Dt MINCORE 2
	38	.Os
	39	.Sh NAME
	40	.Nm mincore
	41	.Nd determine residency of memory pages
	42	.Sh SYNOPSIS
	43	.Fd #include <sys/types.h>
	44	.Fd #include <sys/mman.h>
	45	.Ft int
	46	.Fn mincore "caddr_t addr" "size_t len" "char *vec"
	47	.Sh DESCRIPTION
	48	The
	49	.Fn mincore
	50	system call
	51	allows a process to obtain information about whether pages are
	52	core resident.
	53	The current core residency of the pages is returned
	54	in the character array
	55	.Fa vec .
	56	For each entry in the character array
	57	.Fa vec ,
	58	the following bit values may be set
	59	depending upon the state of the page:
	60	.Bd -literal -offset indent
	61	.nf
	62	MINCORE_INCORE 0x1 /* Page is incore */
	63	MINCORE_REFERENCED 0x2 /* Page has been referenced by us */
	64	MINCORE_MODIFIED 0x4 /* Page has been modified by us */
	65	MINCORE_REFERENCED_OTHER 0x8 /* Page has been referenced */
	66	MINCORE_MODIFIED_OTHER 0x10 /* Page has been modified */
	67	.fi
	68	.Ed
	69	.Sh RETURN VALUES
	70	Upon successful completion,
	71	a value of 0 is returned.
	72	Otherwise, a value of -1 is returned and
	73	.Va errno
	74	is set to indicate the error.
	75	.Sh ERRORS
	76	.Bl -tag -width Er
	77	.\" ===========
	78	.It Bq Er EINVAL
	79	.Fa addr
	80	is not a valid address for user mode.
	81	.\" ===========
	82	.It Bq Er EFAULT
	83	an error occurred trying to copy to the output character array
	84	.Fa vec .
	85	.El
	86	.Sh SEE ALSO
	87	.Xr madvise 2 ,
	88	.Xr minherit 2 ,
	89	.Xr mlock 2 ,
	90	.Xr mprotect 2 ,
	91	.Xr msync 2 ,
	92	.Xr munmap 2
	93	.Sh HISTORY
	94	The
	95	.Fn mincore
	96	function first appeared in 4.4BSD.