sys/mmap.c

   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 <sys/mman.h>
  24 #include <mach/vm_param.h>
  25 #include <errno.h>
  26
  27 void *__mmap(void *addr, size_t len, int prot, int flags, int fildes, off_t off);
  28
  29 /*
  30  * mmap stub, with preemptory failures due to extra parameter checking
  31  * mandated for conformance.
  32  *
  33  * This is for UNIX03 only.
  34  */
  35 void *
  36 mmap(void *addr, size_t len, int prot, int flags, int fildes, off_t off)
  37 {
  38         /*
  39          * Preemptory failures:
  40          *
  41          * o    off is not a multiple of the page size
  42          * o    flags does not contain either MAP_PRIVATE or MAP_SHARED
  43          * o    len is zero
  44          */
  45         extern void cthread_set_errno_self(int);
  46         if ((off & PAGE_MASK) ||
  47             (((flags & MAP_PRIVATE) != MAP_PRIVATE) &&
  48              ((flags & MAP_SHARED) != MAP_SHARED)) ||
  49             (len == 0)) {
  50                 cthread_set_errno_self(EINVAL);
  51                 return(MAP_FAILED);
  52         }
  53
  54         return(__mmap(addr, len, prot, flags, fildes, off));
  55 }