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/*
+----------------------------------------------------------------------+
| PHP Version 7 |
+----------------------------------------------------------------------+
| Copyright (c) 1997-2018 The PHP Group |
+----------------------------------------------------------------------+
| This source file is subject to version 3.01 of the PHP license, |
| that is bundled with this package in the file LICENSE, and is |
| available through the world-wide-web at the following url: |
| http://www.php.net/license/3_01.txt |
| If you did not receive a copy of the PHP license and are unable to |
| obtain it through the world-wide-web, please send a note to |
| license@php.net so we can mail you a copy immediately. |
+----------------------------------------------------------------------+
| Author: Wez Furlong <wez@thebrainroom.com> |
+----------------------------------------------------------------------+
*/
/* $Id$ */
/* Memory Mapping interface for streams.
* The intention is to provide a uniform interface over the most common
* operations that are used within PHP itself, rather than a complete
* API for all memory mapping needs.
*
* ATM, we support only mmap(), but win32 memory mapping support will
* follow soon.
* */
typedef enum {
/* Does the stream support mmap ? */
PHP_STREAM_MMAP_SUPPORTED,
/* Request a range and offset to be mapped;
* while mapped, you MUST NOT use any read/write functions
* on the stream (win9x compatibility) */
PHP_STREAM_MMAP_MAP_RANGE,
/* Unmap the last range that was mapped for the stream */
PHP_STREAM_MMAP_UNMAP
} php_stream_mmap_operation_t;
typedef enum {
PHP_STREAM_MAP_MODE_READONLY,
PHP_STREAM_MAP_MODE_READWRITE,
PHP_STREAM_MAP_MODE_SHARED_READONLY,
PHP_STREAM_MAP_MODE_SHARED_READWRITE
} php_stream_mmap_access_t;
typedef struct {
/* requested offset and length.
* If length is 0, the whole file is mapped */
size_t offset;
size_t length;
php_stream_mmap_access_t mode;
/* returned mapped address */
char *mapped;
} php_stream_mmap_range;
#define PHP_STREAM_MMAP_ALL 0
#define php_stream_mmap_supported(stream) (_php_stream_set_option((stream), PHP_STREAM_OPTION_MMAP_API, PHP_STREAM_MMAP_SUPPORTED, NULL) == 0 ? 1 : 0)
/* Returns 1 if the stream in its current state can be memory mapped,
* 0 otherwise */
#define php_stream_mmap_possible(stream) (!php_stream_is_filtered((stream)) && php_stream_mmap_supported((stream)))
BEGIN_EXTERN_C()
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);
#define php_stream_mmap_range(stream, offset, length, mode, mapped_len) _php_stream_mmap_range((stream), (offset), (length), (mode), (mapped_len))
/* un-maps the last mapped range */
PHPAPI int _php_stream_mmap_unmap(php_stream *stream);
#define php_stream_mmap_unmap(stream) _php_stream_mmap_unmap((stream))
PHPAPI int _php_stream_mmap_unmap_ex(php_stream *stream, zend_off_t readden);
#define php_stream_mmap_unmap_ex(stream, readden) _php_stream_mmap_unmap_ex((stream), (readden))
END_EXTERN_C()
/*
* Local variables:
* tab-width: 4
* c-basic-offset: 4
* End:
* vim600: noet sw=4 ts=4 fdm=marker
* vim<600: noet sw=4 ts=4
*/
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