projects / apple / libc.git / blame
| Commit | Line | Data |
|---|---|---|
| 3d9156a7 A |
1 | /* |
| 2 | * Copyright (c) 2004 Apple Computer, Inc. All rights reserved. | |
| 3 | * | |
| 4 | * @APPLE_LICENSE_HEADER_START@ | |
| 5 | * | |
| 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 | */ | |
| 23 | #include <unistd.h> | |
| 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 | munmap(void *addr, size_t len) | |
| 34 | { | |
| 35 | #if __DARWIN_UNIX03 | |
| 36 | return syscall(SYS_munmap, addr, len); | |
| 37 | #else /* !__DARWIN_UNIX03 */ | |
| 38 | int page_mask; | |
| 39 | size_t offset; | |
| 40 | int rv; | |
| 41 | ||
| 42 | if (len == 0) { | |
| 43 | /* | |
| 44 | * Standard compliance now requires the system to return EINVAL | |
| 45 | * for munmap(addr, 0). Return success now to maintain | |
| 46 | * backwards compatibility. | |
| 47 | */ | |
| 48 | return 0; | |
| 49 | } | |
| 50 | /* | |
| 51 | * Page-align "addr" since the system now requires it | |
| 52 | * for standards compliance. | |
| 53 | * Update "len" to reflect the adjustment and still cover the same area. | |
| 54 | */ | |
| 55 | page_mask = getpagesize() - 1; | |
| 56 | offset = ((uintptr_t) addr) & page_mask; | |
| 57 | addr = (void *) (((uintptr_t) addr) & ~page_mask); | |
| 58 | len += offset; | |
| 59 | rv = syscall(SYS_munmap, addr, len); | |
| 60 | return rv; | |
| 61 | #endif /* !__DARWIN_UNIX03 */ | |
| 62 | } |