libsyscall/wrappers/unix03/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
  24 #include <sys/cdefs.h>
  25
  26 #if __DARWIN_UNIX03
  27
  28 #include <sys/mman.h>
  29 #include <mach/vm_param.h>
  30 #include <errno.h>
  31
  32 void *__mmap(void *addr, size_t len, int prot, int flags, int fildes, off_t off);
  33
  34 /*
  35  * mmap stub, with preemptory failures due to extra parameter checking
  36  * mandated for conformance.
  37  *
  38  * This is for UNIX03 only.
  39  */
  40 void *
  41 mmap(void *addr, size_t len, int prot, int flags, int fildes, off_t off)
  42 {
  43         /*
  44          * Preemptory failures:
  45          *
  46          * o    off is not a multiple of the page size
  47          * o    flags does not contain either MAP_PRIVATE or MAP_SHARED
  48          * o    len is zero
  49          */
  50         extern void cthread_set_errno_self(int);
  51         if ((off & PAGE_MASK) ||
  52             (((flags & MAP_PRIVATE) != MAP_PRIVATE) &&
  53              ((flags & MAP_SHARED) != MAP_SHARED)) ||
  54             (len == 0)) {
  55                 cthread_set_errno_self(EINVAL);
  56                 return(MAP_FAILED);
  57         }
  58
  59         return(__mmap(addr, len, prot, flags, fildes, off));
  60 }
  61
  62 #endif /* __DARWIN_UNIX03 */