NetBSD/regress/sys/uvm/mmap/mmap.c

/*	$NetBSD: mmap.c,v 1.2 1999/07/07 22:00:31 thorpej Exp $	*/

/*-
 * Copyright (c) 1999 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Jason R. Thorpe of the Numerical Aerospace Simulation Facility,
 * NASA Ames Research Center.
 *
 * 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 NetBSD
 *	Foundation, Inc. and its contributors.
 * 4. Neither the name of The NetBSD Foundation 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 NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
 */

/*
 * Test various memory mapping facilities.
 */

#include <sys/param.h>
#include <sys/mman.h>
#include <sys/stat.h>

#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>

int	main __P((int, char *[]));
void	usage __P((void));

int	check_residency __P((void *, int));

int	pgsize;
int	verbose;

int
main(argc, argv)
	int argc;
	char *argv[];
{
	struct stat st;
	void *addr, *addr2;
	int ch, ecode, fd, npgs;
	const char *filename;

	while ((ch = getopt(argc, argv, "v")) != -1) {
		switch (ch) {
		case 'v':
			verbose = 1;
			break;

		default:
			usage();
		}
	}
	argv += optind;
	argc -= optind;

	if (argc != 1)
		usage();

	filename = argv[0];

	ecode = 0;

	pgsize = sysconf(_SC_PAGESIZE);

	/*
	 * TEST MLOCKING A FILE.
	 */

	printf(">>> MAPPING FILE <<<\n");

	fd = open(filename, O_RDONLY, 0666);
	if (fd == -1)
		err(1, "open %s", filename);

	if (fstat(fd, &st) == -1)
		err(1, "fstat %s", filename);

	addr = mmap(NULL, (size_t) st.st_size, PROT_READ, MAP_FILE|MAP_SHARED,
	    fd, (off_t) 0);
	if (addr == MAP_FAILED)
		err(1, "mmap %s", filename);

	(void) close(fd);

	npgs = (st.st_size / pgsize) + 1;

	printf("    CHECKING RESIDENCY\n");

	(void) check_residency(addr, npgs);

	printf("    LOCKING RANGE\n");

	if (mlock(addr, npgs * pgsize) == -1)
		err(1, "mlock %s", filename);

	printf("    CHECKING RESIDENCY\n");

	if (check_residency(addr, npgs) != npgs) {
		printf("    RESIDENCY CHECK FAILED!\n");
		ecode = 1;
	}

	printf("    UNLOCKING RANGE\n");

	if (munlock(addr, pgsize) == -1)
		err(1, "munlock %s", filename);

	(void) munmap(addr, st.st_size);

	/*
	 * TEST MLOCKALL'ING AN ANONYMOUS MEMORY RANGE.
	 */

	npgs = 8;

	printf(">>> MAPPING %d PAGE ANONYMOUS REGION <<<\n", npgs);

	addr = mmap(NULL, npgs * pgsize, PROT_READ|PROT_WRITE,
	    MAP_ANON|MAP_PRIVATE, -1, (off_t) 0);
	if (addr == MAP_FAILED)
		err(1, "mmap anon #1");

	printf("    CHECKING RESIDENCY\n");

	(void) check_residency(addr, npgs);

	printf("    LOCKING ALL - CURRENT and FUTURE\n");

	if (mlockall(MCL_CURRENT|MCL_FUTURE) == -1)
		err(1, "mlockall current/future");

	printf("    CHECKING RESIDENCY\n");

	if (check_residency(addr, npgs) != npgs) {
		printf("    RESIDENCY CHECK FAILED!\n");
		ecode = 1;
	}

	printf(">>> MAPPING ANOTHER %d PAGE ANONYMOUS REGION <<<\n", npgs);

	addr2 = mmap(NULL, npgs * pgsize, PROT_READ, MAP_ANON, -1, (off_t) 0);
	if (addr == MAP_FAILED)
		err(1, "mmap anon #2");

	printf("    CHECKING RESIDENCY\n");

	if (check_residency(addr2, npgs) != npgs) {
		printf("    RESIDENCY CHECK FAILED!\n");
		ecode = 1;
	}

	printf("    UNLOCKING ALL\n");

	(void) munlockall();

	printf(">>> MADV_FREE'ING SECOND ANONYMOUS REGION <<<\n");

	if (madvise(addr2, npgs * pgsize, MADV_FREE) == -1)
		err(1, "madvise");

	printf("    CHECKING RESIDENCY\n");

	if (check_residency(addr2, npgs) != 0) {
		printf("    RESIDENCY CHECK FAILED!\n");
		ecode = 1;
	}

	printf(">>> MADV_FREE'ING FIRST ANONYMOUS REGION <<<\n");

	if (madvise(addr, npgs * pgsize, MADV_FREE) == -1)
		err(1, "madvise");

	printf("    CHECKING RESIDENCY\n");

	if (check_residency(addr, npgs) != 0) {
		printf("    RESIDENCY CHECK FAILED!\n");
		ecode = 1;
	}

	printf(">>> ZEROING FIRST ANONYMOUS REGION <<<\n");

	memset(addr, 0, npgs * pgsize);

	printf(">>> MADV_FREE'ING FIRST ANYMOUS REGION AGAIN <<<\n");

	if (madvise(addr, npgs * pgsize, MADV_FREE) == -1)
		err(1, "madvise");

	printf("    CHECKING RESIDENCY\n");

	if (check_residency(addr2, npgs) != 0) {
		printf("    RESIDENCY CHECK FAILED!\n");
		ecode = 1;
	}

	exit(ecode);
}

int
check_residency(addr, npgs)
	void *addr;
	int npgs;
{
	char *vec;
	int i, resident;

	vec = malloc(npgs);
	if (vec == NULL)
		err(1, "malloc mincore vec");

	if (mincore(addr, npgs * pgsize, vec) == -1)
		err(1, "mincore");

	for (i = 0, resident = 0; i < npgs; i++) {
		if (vec[i] != 0)
			resident++;
		if (verbose)
			printf("page 0x%lx is %sresident\n",
			    addr + (i * pgsize), vec[i] ? "" : "not ");
	}

	free(vec);

	return (resident);
}

void
usage()
{
	extern const char *__progname;

	fprintf(stderr, "usage: %s [-v] filename\n", __progname);
	exit(1);
}