NetBSD-5.0.2/regress/sys/uvm/mmap/mmap.c
/* $NetBSD: mmap.c,v 1.18 2008/04/28 20:23:07 martin 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.
*
* 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 <sys/ipc.h>
#include <sys/shm.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h> /* for memset declaration (?) */
int main(int, char *[]);
void usage(void);
int check_residency(void *, int);
int pgsize;
int verbose;
#define MAPPED_FILE "mapped_file"
#define TEST_PATTERN 0xa5
int
main(argc, argv)
int argc;
char *argv[];
{
struct stat st;
void *addr, *addr2, *addr3;
int i, ch, ecode, fd, npgs, shmid;
const char *filename;
u_int8_t *cp;
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);
if (st.st_size % pgsize != 0)
npgs++;
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 THE MAP_WIRED FLAG TO MMAP.
*/
npgs = 128;
printf(">>> MAPPING %d PAGE ANONYMOUS REGION WITH MAP_WIRED <<<\n",
npgs);
addr = mmap(NULL, npgs * pgsize, PROT_READ|PROT_WRITE,
MAP_ANON|MAP_PRIVATE|MAP_WIRED, -1, (off_t) 0);
if (addr == MAP_FAILED)
err(1, "mmap anon MAP_WIRED");
printf(" CHECKING RESIDENCY\n");
if (check_residency(addr, npgs) != npgs) {
printf(" RESIDENCY CHECK FAILED!\n");
ecode = 1;
}
(void) munmap(addr, npgs * pgsize);
/*
* TEST MLOCKALL'ING AN ANONYMOUS MEMORY RANGE.
*/
npgs = 128;
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");
if (check_residency(addr, npgs) != 0) {
printf(" RESIDENCY CHECK FAILED!\n");
ecode = 1;
}
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 (addr2 == 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(">>> MAPPING THIRD %d PAGE ANONYMOUS REGION, PROT_NONE <<<\n",
npgs);
addr3 = mmap(NULL, npgs * pgsize, PROT_NONE, MAP_ANON, -1, (off_t) 0);
if (addr3 == MAP_FAILED)
err(1, "mmap anon #3");
printf(" CHECKING RESIDENCY\n");
if (check_residency(addr3, npgs) != 0) {
printf(" RESIDENCY CHECK FAILED!\n");
ecode = 1;
}
printf(" PROT_READ'ING MAPPING\n");
if (mprotect(addr3, npgs * pgsize, PROT_READ) == -1)
err(1, "mprotect");
printf(" CHECKING RESIDENCY\n");
if (check_residency(addr3, npgs) != npgs) {
printf(" RESIDENCY CHECK FAILED!\n");
ecode = 1;
}
printf(" UNLOCKING ALL\n");
printf(" CHECKING RESIDENCY\n");
if (check_residency(addr, npgs) != npgs ||
check_residency(addr2, npgs) != npgs) {
printf(" RESIDENCY CHECK FAILED!\n");
ecode = 1;
}
(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(" CHECKING RESIDENCY\n");
if (check_residency(addr, npgs) != npgs) {
printf(" RESIDENCY CHECK FAILED!\n");
ecode = 1;
}
printf(">>> MADV_FREE'ING FIRST ANONYMOUS REGION AGAIN <<<\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(">>> UNMAPPING ANONYMOUS REGIONS <<<\n");
(void) munmap(addr, npgs * pgsize);
(void) munmap(addr2, npgs * pgsize);
(void) munmap(addr3, npgs * pgsize);
printf(">>> CREATING MAPPED FILE <<<\n");
(void) unlink(MAPPED_FILE);
if ((fd = open(MAPPED_FILE, O_RDWR|O_CREAT|O_TRUNC, 0666)) == -1)
err(1, "open %s", MAPPED_FILE);
if ((cp = malloc(npgs * pgsize)) == NULL)
err(1, "malloc %d bytes", npgs * pgsize);
memset(cp, 0x01, npgs * pgsize);
if (write(fd, cp, npgs * pgsize) != npgs * pgsize)
err(1, "write %s", MAPPED_FILE);
addr = mmap(NULL, npgs * pgsize, PROT_READ|PROT_WRITE,
MAP_FILE|MAP_SHARED, fd, (off_t) 0);
if (addr == MAP_FAILED)
err(1, "mmap %s", MAPPED_FILE);
(void) close(fd);
printf(" WRITING TEST PATTERN\n");
for (i = 0; i < npgs * pgsize; i++)
((u_int8_t *)addr)[i] = TEST_PATTERN;
printf(" SYNCING FILE\n");
if (msync(addr, npgs * pgsize, MS_SYNC|MS_INVALIDATE) == -1)
err(1, "msync %s", MAPPED_FILE);
printf(" UNMAPPING FILE\n");
(void) munmap(addr, npgs * pgsize);
printf(" READING FILE\n");
if ((fd = open(MAPPED_FILE, O_RDONLY, 0666)) == -1)
err(1, "open %s", MAPPED_FILE);
if (read(fd, cp, npgs * pgsize) != npgs * pgsize)
err(1, "read %s", MAPPED_FILE);
(void) close(fd);
printf(" CHECKING TEST PATTERN\n");
for (i = 0; i < npgs * pgsize; i++) {
if (cp[i] != TEST_PATTERN) {
printf(" INCORRECT BYTE AT OFFSET %d: "
"0x%02x should be 0x%02x\n", i, cp[i],
TEST_PATTERN);
ecode = 1;
break;
}
}
printf(">>> CREATING SYSV SHM SEGMENT <<<\n");
if ((shmid = shmget(IPC_PRIVATE, npgs * pgsize,
IPC_CREAT|S_IRUSR|S_IWUSR)) == -1)
err(1, "shmget");
if ((addr = shmat(shmid, NULL, 0)) == (void *) -1)
err(1, "shmat");
printf(" CHECKING RESIDENCY\n");
if (check_residency(addr, npgs) != 0) {
printf(" RESIDENCY CHECK FAILED!\n");
ecode = 1;
}
printf(" ZEROING SEGMENT\n");
memset(addr, 0xff, npgs * pgsize);
printf(" CHECKING RESIDENCY\n");
if (check_residency(addr, npgs) != npgs) {
printf(" RESIDENCY CHECK FAILED!\n");
ecode = 1;
}
printf(" MADV_FREE'ING SEGMENT\n");
if (madvise(addr, npgs * pgsize, MADV_FREE) == -1)
err(1, "madvise");
printf(" CHECKING RESIDENCY\n");
/*
* NOTE! Even though we have MADV_FREE'd the range,
* there is another reference (the kernel's) to the
* object which owns the pages. In this case, the
* kernel does not simply free the pages, as haphazardly
* freeing pages when there are still references to
* an object can cause data corruption (say, the other
* referencer doesn't expect the pages to be freed,
* and is surprised by the subsequent ZFOD).
*
* Because of this, we simply report the number of
* pages still resident, for information only.
*/
npgs = check_residency(addr, npgs);
printf(" RESIDENCY CHECK: %d pages still resident\n", npgs);
if (shmdt(addr) == -1)
warn("shmdt");
if (shmctl(shmid, IPC_RMID, NULL) == -1)
err(1, "shmctl");
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()
{
fprintf(stderr, "usage: %s [-v] filename\n", getprogname());
exit(1);
}