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auxiliary/os: add wrappers for mmap/munmap

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The use of mmap() in winsys requires large file support.  Not all OSes
have LFS so a wrapper should be used.  In particular, os_mmap() should
call __mmap2() on Android.
This commit is contained in:
Chia-I Wu 2011-08-21 11:58:30 +08:00
parent 0d636213d4
commit 9bda86c355
1 changed files with 87 additions and 0 deletions
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87
src/gallium/auxiliary/os/os_mman.h Normal file
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/**************************************************************************
*
* Copyright 2011 LunarG, Inc.
* All Rights Reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sub license, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice (including the
* next paragraph) shall be included in all copies or substantial portions
* of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
* IN NO EVENT SHALL VMWARE AND/OR ITS SUPPLIERS BE LIABLE FOR
* ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*
**************************************************************************/
/**
* @file
* OS independent memory mapping (with large file support).
*
* @author Chia-I Wu <olvaffe@gmail.com>
*/
#ifndef _OS_MMAN_H_
#define _OS_MMAN_H_
#include "pipe/p_config.h"
#include "pipe/p_compiler.h"
#if defined(PIPE_OS_UNIX)
# ifndef _FILE_OFFSET_BITS
# error _FILE_OFFSET_BITS must be defined to 64
# endif
# include <sys/mman.h>
#else
# error Unsupported OS
#endif
#if defined(PIPE_OS_ANDROID)
# include <errno.h> /* for EINVAL */
#endif
#ifdef __cplusplus
extern "C" {
#endif
#if defined(PIPE_OS_ANDROID)
extern void *__mmap2(void *, size_t, int, int, int, size_t);
static INLINE void *os_mmap(void *addr, size_t length, int prot, int flags, int fd, loff_t offset)
{
/* offset must be aligned to 4096 (not necessarily the page size) */
if (unlikely(offset & 4095)) {
errno = EINVAL;
return MAP_FAILED;
}
return __mmap2(addr, length, prot, flags, fd, (size_t) (offset >> 12));
}
#else
/* assume large file support exists */
# define os_mmap(addr, length, prot, flags, fd, offset) mmap(addr, length, prot, flags, fd, offset)
#endif
#define os_munmap(addr, length) munmap(addr, length)
#ifdef __cplusplus
}
#endif
#endif /* _OS_MMAN_H_ */