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Viewing changes to main/streams/mmap.c

  • Committer: Bazaar Package Importer
  • Author(s): Adam Conrad
  • Date: 2005-10-09 03:14:32 UTC
  • Revision ID: james.westby@ubuntu.com-20051009031432-kspik3lobxstafv9
Tags: upstream-5.0.5
Import upstream version 5.0.5

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main/streams/mmap.c
 
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/*
 
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  +----------------------------------------------------------------------+
 
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  | PHP Version 5                                                        |
 
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  +----------------------------------------------------------------------+
 
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  | Copyright (c) 1997-2004 The PHP Group                                |
 
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  +----------------------------------------------------------------------+
 
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  | This source file is subject to version 3.0 of the PHP license,       |
 
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  | that is bundled with this package in the file LICENSE, and is        |
 
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  | available through the world-wide-web at the following url:           |
 
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  | http://www.php.net/license/3_0.txt.                                  |
 
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  | If you did not receive a copy of the PHP license and are unable to   |
 
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  | obtain it through the world-wide-web, please send a note to          |
 
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  | license@php.net so we can mail you a copy immediately.               |
 
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  +----------------------------------------------------------------------+
 
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  | Author: Wez Furlong <wez@thebrainroom.com>                           |
 
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  +----------------------------------------------------------------------+
 
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*/
 
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/* $Id: mmap.c,v 1.5.2.2 2005/02/24 11:35:10 sniper Exp $ */
 
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/* Memory Mapping interface for streams */
 
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#include "php.h"
 
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#include "php_streams_int.h"
 
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PHPAPI char *_php_stream_mmap_range(php_stream *stream, size_t offset, size_t length, php_stream_mmap_operation_t mode, size_t *mapped_len TSRMLS_DC)
 
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{
 
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        php_stream_mmap_range range;
 
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        range.offset = offset;
 
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        range.length = length;
 
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        range.mode = mode;
 
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        range.mapped = NULL;
 
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        /* For now, we impose an arbitrary 2MB limit to avoid
 
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         * runaway swapping when large files are passed thru. */
 
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        if (length > 2 * 1024 * 1024) {
 
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                return NULL;
 
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        }
 
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        if (PHP_STREAM_OPTION_RETURN_OK == php_stream_set_option(stream, PHP_STREAM_OPTION_MMAP_API, PHP_STREAM_MMAP_MAP_RANGE, &range)) {
 
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                if (mapped_len) {
 
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                        *mapped_len = range.length;
 
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                }
 
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                return range.mapped;
 
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        }
 
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        return NULL;
 
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}
 
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PHPAPI int _php_stream_mmap_unmap(php_stream *stream TSRMLS_DC)
 
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{
 
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        return php_stream_set_option(stream, PHP_STREAM_OPTION_MMAP_API, PHP_STREAM_MMAP_UNMAP, NULL) == PHP_STREAM_OPTION_RETURN_OK ? 1 : 0;
 
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}
 
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/*
 
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 * Local variables:
 
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 * tab-width: 4
 
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 * c-basic-offset: 4
 
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 * End:
 
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 * vim600: noet sw=4 ts=4 fdm=marker
 
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 * vim<600: noet sw=4 ts=4
 
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 */