[Mesa-dev] [PATCH 1/3] auxiliary/os: add wrappers for mmap/munmap

[Chia-I Wu]

On Sun, Aug 21, 2011 at 8:41 PM, Chia-I Wu <olvaffe at gmail.com> wrote:
> From: Chia-I Wu <olv at lunarg.com>
>
> 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.
If there is no objection, I plan to commit this series later today.
> ---
>  src/gallium/auxiliary/os/os_mman.h |   87 ++++++++++++++++++++++++++++++++++++
>  1 files changed, 87 insertions(+), 0 deletions(-)
>  create mode 100644 src/gallium/auxiliary/os/os_mman.h
>
> diff --git a/src/gallium/auxiliary/os/os_mman.h b/src/gallium/auxiliary/os/os_mman.h
> new file mode 100644
> index 0000000..b48eb053
> --- /dev/null
> +++ b/src/gallium/auxiliary/os/os_mman.h
> @@ -0,0 +1,87 @@
> +/**************************************************************************
> + *
> + * 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 at 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_ */
> --
> 1.7.5.4
>
>



-- 
olv at LunarG.com