[apple/libc.git] / sys / msync.c

/*
 * Copyright (c) 2004 Apple Computer, Inc. All rights reserved.
 *
 * @APPLE_LICENSE_HEADER_START@
 * 
 * This file contains Original Code and/or Modifications of Original Code
 * as defined in and that are subject to the Apple Public Source License
 * Version 2.0 (the 'License'). You may not use this file except in
 * compliance with the License. Please obtain a copy of the License at
 * http://www.opensource.apple.com/apsl/ and read it before using this
 * file.
 * 
 * The Original Code and all software distributed under the License are
 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
 * Please see the License for the specific language governing rights and
 * limitations under the License.
 * 
 * @APPLE_LICENSE_HEADER_END@
 */
#include <unistd.h>
#include <sys/types.h>
#include <sys/mman.h>
#include <sys/syscall.h>

/*
 * Stub function to account for the differences in standard compliance
 * while maintaining binary backward compatibility.
 */
int
msync(void *addr, size_t len, int flags)
{
#if __DARWIN_UNIX03
	return syscall(SYS_msync, addr, len, flags);
#else	/* !__DARWIN_UNIX03 */
	int	page_mask;
	size_t	offset;
	int	rv;

	/*
	 * Page-align "addr" since the system now requires it
	 * for standards compliance.
	 * Update "len" to reflect the alignment.
	 */
	page_mask = getpagesize() - 1;
	offset = ((uintptr_t) addr) & page_mask;
	addr = (void *) (((uintptr_t) addr) & ~page_mask);
	len += offset;
	rv = syscall(SYS_msync, addr, len, flags);
	return rv;
#endif	/* !__DARWIN_UNIX03 */
}
Commit	Line	Data
9385eb3d	1	/*
3d9156a7	2	* Copyright (c) 2004 Apple Computer, Inc. All rights reserved.
9385eb3d A	3	*
	4	* @APPLE_LICENSE_HEADER_START@
	5	*
9385eb3d A	6	* This file contains Original Code and/or Modifications of Original Code
	7	* as defined in and that are subject to the Apple Public Source License
	8	* Version 2.0 (the 'License'). You may not use this file except in
	9	* compliance with the License. Please obtain a copy of the License at
	10	* http://www.opensource.apple.com/apsl/ and read it before using this
	11	* file.
	12	*
	13	* The Original Code and all software distributed under the License are
	14	* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
	15	* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
	16	* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
	17	* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
	18	* Please see the License for the specific language governing rights and
	19	* limitations under the License.
	20	*
	21	* @APPLE_LICENSE_HEADER_END@
	22	*/
e9ce8d39	23	#include <unistd.h>
3d9156a7 A	24	#include <sys/types.h>
	25	#include <sys/mman.h>
	26	#include <sys/syscall.h>
	27
	28	/*
	29	* Stub function to account for the differences in standard compliance
	30	* while maintaining binary backward compatibility.
	31	*/
	32	int
	33	msync(void *addr, size_t len, int flags)
	34	{
	35	#if __DARWIN_UNIX03
	36	return syscall(SYS_msync, addr, len, flags);
	37	#else /* !__DARWIN_UNIX03 */
	38	int page_mask;
	39	size_t offset;
	40	int rv;
e9ce8d39	41
3d9156a7 A	42	/*
	43	* Page-align "addr" since the system now requires it
	44	* for standards compliance.
	45	* Update "len" to reflect the alignment.
	46	*/
	47	page_mask = getpagesize() - 1;
	48	offset = ((uintptr_t) addr) & page_mask;
	49	addr = (void *) (((uintptr_t) addr) & ~page_mask);
	50	len += offset;
	51	rv = syscall(SYS_msync, addr, len, flags);
	52	return rv;
	53	#endif /* !__DARWIN_UNIX03 */
e9ce8d39	54	}