78 lines
3.1 KiB
C
78 lines
3.1 KiB
C
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/*
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+----------------------------------------------------------------------+
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| Copyright (c) The PHP Group |
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+----------------------------------------------------------------------+
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| This source file is subject to version 3.01 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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| https://www.php.net/license/3_01.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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/* Memory Mapping interface for streams.
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* The intention is to provide a uniform interface over the most common
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* operations that are used within PHP itself, rather than a complete
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* API for all memory mapping needs.
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*
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* ATM, we support only mmap(), but win32 memory mapping support will
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* follow soon.
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* */
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typedef enum {
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/* Does the stream support mmap ? */
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PHP_STREAM_MMAP_SUPPORTED,
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/* Request a range and offset to be mapped;
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* while mapped, you MUST NOT use any read/write functions
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* on the stream (win9x compatibility) */
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PHP_STREAM_MMAP_MAP_RANGE,
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/* Unmap the last range that was mapped for the stream */
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PHP_STREAM_MMAP_UNMAP
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} php_stream_mmap_operation_t;
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typedef enum {
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PHP_STREAM_MAP_MODE_READONLY,
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PHP_STREAM_MAP_MODE_READWRITE,
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PHP_STREAM_MAP_MODE_SHARED_READONLY,
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PHP_STREAM_MAP_MODE_SHARED_READWRITE
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} php_stream_mmap_access_t;
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typedef struct {
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/* requested offset and length.
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* If length is 0, the whole file is mapped */
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size_t offset;
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size_t length;
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php_stream_mmap_access_t mode;
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/* returned mapped address */
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char *mapped;
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} php_stream_mmap_range;
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#define PHP_STREAM_MMAP_ALL 0
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#define PHP_STREAM_MMAP_MAX (512 * 1024 * 1024)
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#define php_stream_mmap_supported(stream) (_php_stream_set_option((stream), PHP_STREAM_OPTION_MMAP_API, PHP_STREAM_MMAP_SUPPORTED, NULL) == 0 ? 1 : 0)
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/* Returns 1 if the stream in its current state can be memory mapped,
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* 0 otherwise */
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#define php_stream_mmap_possible(stream) (!php_stream_is_filtered((stream)) && php_stream_mmap_supported((stream)))
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BEGIN_EXTERN_C()
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PHPAPI char *_php_stream_mmap_range(php_stream *stream, size_t offset, size_t length, php_stream_mmap_access_t mode, size_t *mapped_len);
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#define php_stream_mmap_range(stream, offset, length, mode, mapped_len) _php_stream_mmap_range((stream), (offset), (length), (mode), (mapped_len))
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/* un-maps the last mapped range */
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PHPAPI int _php_stream_mmap_unmap(php_stream *stream);
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#define php_stream_mmap_unmap(stream) _php_stream_mmap_unmap((stream))
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PHPAPI int _php_stream_mmap_unmap_ex(php_stream *stream, zend_off_t readden);
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#define php_stream_mmap_unmap_ex(stream, readden) _php_stream_mmap_unmap_ex((stream), (readden))
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END_EXTERN_C()
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