minix/tests/lib/libc/sys/t_mincore.c

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/* $NetBSD: t_mincore.c,v 1.8 2012/06/08 07:18:58 martin Exp $ */
/*-
* Copyright (c) 2011 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Jukka Ruohonen.
*
* 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.
*/
/*-
* 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.
*/
#include <sys/cdefs.h>
__RCSID("$NetBSD: t_mincore.c,v 1.8 2012/06/08 07:18:58 martin Exp $");
#include <sys/mman.h>
#include <sys/shm.h>
#include <atf-c.h>
#include <errno.h>
#include <fcntl.h>
#include <kvm.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/resource.h>
static long page = 0;
static const char path[] = "mincore";
static size_t check_residency(void *, size_t);
static size_t
check_residency(void *addr, size_t npgs)
{
size_t i, resident;
char *vec;
vec = malloc(npgs);
ATF_REQUIRE(vec != NULL);
ATF_REQUIRE(mincore(addr, npgs * page, vec) == 0);
for (i = resident = 0; i < npgs; i++) {
if (vec[i] != 0)
resident++;
#if 0
(void)fprintf(stderr, "page 0x%p is %sresident\n",
(char *)addr + (i * page), vec[i] ? "" : "not ");
#endif
}
free(vec);
return resident;
}
ATF_TC(mincore_err);
ATF_TC_HEAD(mincore_err, tc)
{
atf_tc_set_md_var(tc, "descr", "Test errors from mincore(2)");
}
ATF_TC_BODY(mincore_err, tc)
{
char *map, *vec;
map = mmap(NULL, page, PROT_WRITE, MAP_ANON | MAP_PRIVATE, -1, 0);
vec = malloc(page);
ATF_REQUIRE(vec != NULL);
ATF_REQUIRE(map != MAP_FAILED);
errno = 0;
ATF_REQUIRE_ERRNO(EINVAL, mincore(map, 0, vec) == -1);
errno = 0;
ATF_REQUIRE_ERRNO(ENOMEM, mincore(0, page, vec) == -1);
errno = 0;
ATF_REQUIRE_ERRNO(EFAULT, mincore(map, page, (void *)-1) == -1);
free(vec);
ATF_REQUIRE(munmap(map, page) == 0);
}
ATF_TC_WITH_CLEANUP(mincore_resid);
ATF_TC_HEAD(mincore_resid, tc)
{
atf_tc_set_md_var(tc, "descr", "Test page residency with mincore(2)");
}
ATF_TC_BODY(mincore_resid, tc)
{
void *addr, *addr2, *addr3, *buf;
size_t npgs = 0, resident;
struct stat st;
int fd, rv;
struct rlimit rlim;
ATF_REQUIRE(getrlimit(RLIMIT_MEMLOCK, &rlim) == 0);
rlim.rlim_cur = rlim.rlim_max;
ATF_REQUIRE(setrlimit(RLIMIT_MEMLOCK, &rlim) == 0);
(void)memset(&st, 0, sizeof(struct stat));
fd = open(path, O_RDWR | O_CREAT, 0700);
buf = malloc(page * 5);
ATF_REQUIRE(fd >= 0);
ATF_REQUIRE(buf != NULL);
rv = write(fd, buf, page * 5);
ATF_REQUIRE(rv >= 0);
ATF_REQUIRE(fd >= 0);
ATF_REQUIRE(fstat(fd, &st) == 0);
addr = mmap(NULL, (size_t)st.st_size, PROT_READ,
MAP_FILE | MAP_SHARED, fd, (off_t) 0);
ATF_REQUIRE(addr != MAP_FAILED);
(void)close(fd);
npgs = st.st_size / page;
if (st.st_size % page != 0)
npgs++;
(void)check_residency(addr, npgs);
rv = mlock(addr, npgs * page);
if (rv == -1 && errno == EAGAIN)
atf_tc_skip("hit process resource limits");
ATF_REQUIRE(munmap(addr, st.st_size) == 0);
npgs = 128;
addr = mmap(NULL, npgs * page, PROT_READ | PROT_WRITE,
MAP_ANON | MAP_PRIVATE | MAP_WIRED, -1, (off_t)0);
if (addr == MAP_FAILED)
atf_tc_skip("could not mmap wired anonymous test area, system "
"might be low on memory");
ATF_REQUIRE(check_residency(addr, npgs) == npgs);
ATF_REQUIRE(munmap(addr, npgs * page) == 0);
npgs = 128;
addr = mmap(NULL, npgs * page, PROT_READ | PROT_WRITE,
MAP_ANON | MAP_PRIVATE, -1, (off_t)0);
ATF_REQUIRE(addr != MAP_FAILED);
/*
* Check that the in-core pages match the locked pages.
*/
ATF_REQUIRE(check_residency(addr, npgs) == 0);
errno = 0;
if (mlockall(MCL_CURRENT|MCL_FUTURE) != 0 && errno != ENOMEM)
atf_tc_fail("mlockall(2) failed");
if (errno == ENOMEM)
atf_tc_skip("mlockall() exceeded process resource limits");
resident = check_residency(addr, npgs);
if (resident < npgs)
atf_tc_fail("mlockall(MCL_FUTURE) succeeded, still only "
"%zu pages of the newly mapped %zu pages are resident",
resident, npgs);
addr2 = mmap(NULL, npgs * page, PROT_READ, MAP_ANON, -1, (off_t)0);
addr3 = mmap(NULL, npgs * page, PROT_NONE, MAP_ANON, -1, (off_t)0);
if (addr2 == MAP_FAILED || addr3 == MAP_FAILED)
atf_tc_skip("could not mmap more anonymous test pages with "
"mlockall(MCL_FUTURE) in effect, system "
"might be low on memory");
ATF_REQUIRE(check_residency(addr2, npgs) == npgs);
ATF_REQUIRE(check_residency(addr3, npgs) == 0);
ATF_REQUIRE(mprotect(addr3, npgs * page, PROT_READ) == 0);
ATF_REQUIRE(check_residency(addr, npgs) == npgs);
ATF_REQUIRE(check_residency(addr2, npgs) == npgs);
(void)munlockall();
ATF_REQUIRE(madvise(addr2, npgs * page, MADV_FREE) == 0);
ATF_REQUIRE(check_residency(addr2, npgs) == 0);
(void)memset(addr, 0, npgs * page);
ATF_REQUIRE(madvise(addr, npgs * page, MADV_FREE) == 0);
ATF_REQUIRE(check_residency(addr, npgs) == 0);
(void)munmap(addr, npgs * page);
(void)munmap(addr2, npgs * page);
(void)munmap(addr3, npgs * page);
(void)unlink(path);
}
ATF_TC_CLEANUP(mincore_resid, tc)
{
(void)unlink(path);
}
ATF_TC(mincore_shmseg);
ATF_TC_HEAD(mincore_shmseg, tc)
{
atf_tc_set_md_var(tc, "descr", "residency of shared memory");
}
ATF_TC_BODY(mincore_shmseg, tc)
{
size_t npgs = 128;
void *addr = NULL;
int shmid;
shmid = shmget(IPC_PRIVATE, npgs * page,
IPC_CREAT | S_IRUSR | S_IWUSR);
ATF_REQUIRE(shmid != -1);
addr = shmat(shmid, NULL, 0);
ATF_REQUIRE(addr != NULL);
ATF_REQUIRE(check_residency(addr, npgs) == 0);
(void)memset(addr, 0xff, npgs * page);
ATF_REQUIRE(check_residency(addr, npgs) == npgs);
ATF_REQUIRE(madvise(addr, npgs * page, MADV_FREE) == 0);
/*
* 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);
(void)fprintf(stderr, "%zu pages still resident\n", npgs);
ATF_REQUIRE(shmdt(addr) == 0);
ATF_REQUIRE(shmctl(shmid, IPC_RMID, NULL) == 0);
}
ATF_TP_ADD_TCS(tp)
{
page = sysconf(_SC_PAGESIZE);
ATF_REQUIRE(page >= 0);
ATF_TP_ADD_TC(tp, mincore_err);
ATF_TP_ADD_TC(tp, mincore_resid);
ATF_TP_ADD_TC(tp, mincore_shmseg);
return atf_no_error();
}