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 #include <mach/mach_init.h>
  32 #include "stack_logging_internal.h"
  33
  34 void *__mmap(void *addr, size_t len, int prot, int flags, int fildes, off_t off);
  35
  36 /*
  37  * mmap stub, with preemptory failures due to extra parameter checking
  38  * mandated for conformance.
  39  *
  40  * This is for UNIX03 only.
  41  */
  42 void *
  43 mmap(void *addr, size_t len, int prot, int flags, int fildes, off_t off)
  44 {
  45         /*
  46          * Preemptory failures:
  47          *
  48          * o    off is not a multiple of the page size
  49          * o    flags does not contain either MAP_PRIVATE or MAP_SHARED
  50          * o    len is zero
  51          */
  52         extern void cerror_nocancel(int);
  53         if ((off & PAGE_MASK) ||
  54             (((flags & MAP_PRIVATE) != MAP_PRIVATE) &&
  55             ((flags & MAP_SHARED) != MAP_SHARED)) ||
  56             (len == 0)) {
  57                 cerror_nocancel(EINVAL);
  58                 return MAP_FAILED;
  59         }
  60
  61         void *ptr = __mmap(addr, len, prot, flags, fildes, off);
  62
  63         if (__syscall_logger) {
  64                 int stackLoggingFlags = stack_logging_type_vm_allocate;
  65                 if (flags & MAP_ANON) {
  66                         stackLoggingFlags |= (fildes & VM_FLAGS_ALIAS_MASK);
  67                 } else {
  68                         stackLoggingFlags |= stack_logging_type_mapped_file_or_shared_mem;
  69                 }
  70                 __syscall_logger(stackLoggingFlags, (uintptr_t)mach_task_self(), (uintptr_t)len, 0, (uintptr_t)ptr, 0);
  71         }
  72
  73         return ptr;
  74 }
  75
  76 #endif /* __DARWIN_UNIX03 */