reactos/dll/opengl/mesa/src/gallium/auxiliary/os/os_mman.h

   1 /**************************************************************************
   2  *
   3  * Copyright 2011 LunarG, Inc.
   4  * All Rights Reserved.
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a
   7  * copy of this software and associated documentation files (the
   8  * "Software"), to deal in the Software without restriction, including
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  11  * permit persons to whom the Software is furnished to do so, subject to
  12  * the following conditions:
  13  *
  14  * The above copyright notice and this permission notice (including the
  15  * next paragraph) shall be included in all copies or substantial portions
  16  * of the Software.
  17  *
  18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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  25  *
  26  **************************************************************************/
  27
  28 /**
  29  * @file
  30  * OS independent memory mapping (with large file support).
  31  *
  32  * @author Chia-I Wu <olvaffe@gmail.com>
  33  */
  34
  35 #ifndef _OS_MMAN_H_
  36 #define _OS_MMAN_H_
  37
  38
  39 #include "pipe/p_config.h"
  40 #include "pipe/p_compiler.h"
  41
  42 #if defined(PIPE_OS_UNIX)
  43 #  ifndef _FILE_OFFSET_BITS
  44 #    error _FILE_OFFSET_BITS must be defined to 64
  45 #  endif
  46 #  include <sys/mman.h>
  47 #else
  48 #  error Unsupported OS
  49 #endif
  50
  51 #if defined(PIPE_OS_ANDROID)
  52 #  include <errno.h> /* for EINVAL */
  53 #endif
  54
  55 #ifdef  __cplusplus
  56 extern "C" {
  57 #endif
  58
  59
  60 #if defined(PIPE_OS_ANDROID)
  61
  62 extern void *__mmap2(void *, size_t, int, int, int, size_t);
  63
  64 static INLINE void *os_mmap(void *addr, size_t length, int prot, int flags, int fd, loff_t offset)
  65 {
  66    /* offset must be aligned to 4096 (not necessarily the page size) */
  67    if (unlikely(offset & 4095)) {
  68       errno = EINVAL;
  69       return MAP_FAILED;
  70    }
  71
  72    return __mmap2(addr, length, prot, flags, fd, (size_t) (offset >> 12));
  73 }
  74
  75 #else
  76 /* assume large file support exists */
  77 #  define os_mmap(addr, length, prot, flags, fd, offset) mmap(addr, length, prot, flags, fd, offset)
  78 #endif
  79
  80 #define os_munmap(addr, length) munmap(addr, length)
  81
  82
  83 #ifdef  __cplusplus
  84 }
  85 #endif
  86
  87 #endif /* _OS_MMAN_H_ */