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

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/* $NetBSD: t_msync.c,v 1.2 2012/03/16 06:15:17 matt 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.
*/
#include <sys/cdefs.h>
__RCSID("$NetBSD: t_msync.c,v 1.2 2012/03/16 06:15:17 matt Exp $");
#include <sys/mman.h>
#include <atf-c.h>
#include <errno.h>
#include <fcntl.h>
#include <limits.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
static long page = 0;
static const off_t off = 512;
static const char path[] = "msync";
static const char *msync_sync(const char *, int);
static const char *
msync_sync(const char *garbage, int flags)
{
char *buf, *map = MAP_FAILED;
const char *str = NULL;
size_t i, len;
ssize_t tot;
int fd, rv;
/*
* Create a temporary file, write
* one page to it, and map the file.
*/
buf = malloc(page);
if (buf == NULL)
return NULL;
for (i = 0; i < (size_t)page; i++)
buf[i] = 'x';
fd = open(path, O_RDWR | O_CREAT, 0700);
if (fd < 0) {
str = "failed to open";
goto out;
}
tot = 0;
while (tot < page) {
rv = write(fd, buf, sizeof(buf));
if (rv < 0) {
str = "failed to write";
goto out;
}
tot += rv;
}
map = mmap(NULL, page, PROT_READ | PROT_WRITE, MAP_FILE|MAP_PRIVATE,
fd, 0);
if (map == MAP_FAILED) {
str = "failed to map";
goto out;
}
/*
* Seek to an arbitrary offset and
* write garbage to this position.
*/
if (lseek(fd, off, SEEK_SET) != off) {
str = "failed to seek";
goto out;
}
len = strlen(garbage);
rv = write(fd, garbage, len);
if (rv != (ssize_t)len) {
str = "failed to write garbage";
goto out;
}
/*
* Synchronize the mapping and verify
* that garbage is at the given offset.
*/
if (msync(map, page, flags) != 0) {
str = "failed to msync";
goto out;
}
if (memcmp(map + off, garbage, len) != 0) {
str = "msync did not synchronize";
goto out;
}
out:
free(buf);
(void)close(fd);
(void)unlink(path);
if (map != MAP_FAILED)
(void)munmap(map, page);
return str;
}
ATF_TC(msync_async);
ATF_TC_HEAD(msync_async, tc)
{
atf_tc_set_md_var(tc, "descr", "Test of msync(2), MS_ASYNC");
}
ATF_TC_BODY(msync_async, tc)
{
const char *str;
str = msync_sync("garbage", MS_ASYNC);
if (str != NULL)
atf_tc_fail("%s", str);
}
ATF_TC(msync_err);
ATF_TC_HEAD(msync_err, tc)
{
atf_tc_set_md_var(tc, "descr", "Test error conditions in msync(2)");
}
ATF_TC_BODY(msync_err, tc)
{
char *map = MAP_FAILED;
/*
* Test that invalid flags error out.
*/
ATF_REQUIRE(msync_sync("error", -1) != NULL);
ATF_REQUIRE(msync_sync("error", INT_MAX) != NULL);
errno = 0;
/*
* Map a page and then unmap to get an unmapped address.
*/
map = mmap(NULL, page, PROT_READ | PROT_WRITE, MAP_ANON | MAP_PRIVATE,
-1, 0);
ATF_REQUIRE(map != MAP_FAILED);
(void)munmap(map, page);
ATF_REQUIRE(msync(map, page, MS_SYNC) != 0);
ATF_REQUIRE(errno == EFAULT);
}
ATF_TC(msync_invalidate);
ATF_TC_HEAD(msync_invalidate, tc)
{
atf_tc_set_md_var(tc, "descr", "Test of msync(2), MS_INVALIDATE");
}
ATF_TC_BODY(msync_invalidate, tc)
{
const char *str;
str = msync_sync("garbage", MS_INVALIDATE);
if (str != NULL)
atf_tc_fail("%s", str);
}
ATF_TC(msync_sync);
ATF_TC_HEAD(msync_sync, tc)
{
atf_tc_set_md_var(tc, "descr", "Test of msync(2), MS_SYNC");
}
ATF_TC_BODY(msync_sync, tc)
{
const char *str;
str = msync_sync("garbage", MS_SYNC);
if (str != NULL)
atf_tc_fail("%s", str);
}
ATF_TP_ADD_TCS(tp)
{
page = sysconf(_SC_PAGESIZE);
ATF_REQUIRE(page >= 0);
ATF_REQUIRE(page > off);
ATF_TP_ADD_TC(tp, msync_async);
ATF_TP_ADD_TC(tp, msync_err);
ATF_TP_ADD_TC(tp, msync_invalidate);
ATF_TP_ADD_TC(tp, msync_sync);
return atf_no_error();
}