diff options
Diffstat (limited to 'main/streams/mmap.c')
| -rw-r--r-- | main/streams/mmap.c | 75 |
1 files changed, 75 insertions, 0 deletions
diff --git a/main/streams/mmap.c b/main/streams/mmap.c new file mode 100644 index 0000000..4f9388c --- /dev/null +++ b/main/streams/mmap.c @@ -0,0 +1,75 @@ +/* + +----------------------------------------------------------------------+ + | PHP Version 5 | + +----------------------------------------------------------------------+ + | Copyright (c) 1997-2013 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 */ +#include "php.h" +#include "php_streams_int.h" + +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) +{ + php_stream_mmap_range range; + + range.offset = offset; + range.length = length; + range.mode = mode; + range.mapped = NULL; + + /* For now, we impose an arbitrary limit to avoid + * runaway swapping when large files are passed thru. */ + if (length > 4 * 1024 * 1024) { + return NULL; + } + + if (PHP_STREAM_OPTION_RETURN_OK == php_stream_set_option(stream, PHP_STREAM_OPTION_MMAP_API, PHP_STREAM_MMAP_MAP_RANGE, &range)) { + if (mapped_len) { + *mapped_len = range.length; + } + return range.mapped; + } + return NULL; +} + +PHPAPI int _php_stream_mmap_unmap(php_stream *stream TSRMLS_DC) +{ + return php_stream_set_option(stream, PHP_STREAM_OPTION_MMAP_API, PHP_STREAM_MMAP_UNMAP, NULL) == PHP_STREAM_OPTION_RETURN_OK ? 1 : 0; +} + +PHPAPI int _php_stream_mmap_unmap_ex(php_stream *stream, off_t readden TSRMLS_DC) +{ + int ret = 1; + + if (php_stream_seek(stream, readden, SEEK_CUR) != 0) { + ret = 0; + } + if (php_stream_mmap_unmap(stream) == 0) { + ret = 0; + } + + return ret; +} + +/* + * 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 + */ |