/* * 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 munmap(void *addr, size_t len) { #if __DARWIN_UNIX03 return syscall(SYS_munmap, addr, len); #else /* !__DARWIN_UNIX03 */ int page_mask; size_t offset; int rv; if (len == 0) { /* * Standard compliance now requires the system to return EINVAL * for munmap(addr, 0). Return success now to maintain * backwards compatibility. */ return 0; } /* * Page-align "addr" since the system now requires it * for standards compliance. * Update "len" to reflect the adjustment and still cover the same area. */ page_mask = getpagesize() - 1; offset = ((uintptr_t) addr) & page_mask; addr = (void *) (((uintptr_t) addr) & ~page_mask); len += offset; rv = syscall(SYS_munmap, addr, len); return rv; #endif /* !__DARWIN_UNIX03 */ }