text: /* $NetBSD: t_msync.c,v 1.3 2017/01/14 20:52:42 christos 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 1.3 2017/01/14 20:52:42 christos 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 len;
  	int fd, rv;
  
  	/*
  	 * Create a temporary file, write
  	 * one page to it, and map the file.
  	 */
  	buf = malloc(page);
  
  	if (buf == NULL)
  		return NULL;
  
  	memset(buf, 'x', page);
  
  	fd = open(path, O_RDWR | O_CREAT, 0700);
  
  	if (fd < 0) {
  		free(buf);
  		return "failed to open";
  	}
  
  	ATF_REQUIRE_MSG(write(fd, buf, page) != -1, "write(2) failed: %s",
  	    strerror(errno));
  
  	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.
  	 */
  #ifdef __FreeBSD__
  	errno = 0;
  	ATF_REQUIRE_ERRNO(EINVAL, msync_sync("error", -1) != NULL);
  	errno = 0;
  	ATF_REQUIRE_ERRNO(EINVAL, msync_sync("error", INT_MAX) != NULL);
  #else
  	ATF_REQUIRE(msync_sync("error", -1) != NULL);
  	ATF_REQUIRE(msync_sync("error", INT_MAX) != NULL);
  #endif
  
  	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);
  #ifdef __FreeBSD__
  	ATF_REQUIRE(errno == ENOMEM);
  #else
  	ATF_REQUIRE(errno == EFAULT);
  #endif
  }
  
  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();
  }
  