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Annotation of embedaddon/php/main/streams/mmap.c, revision 1.1.1.2

1.1       misho       1: /*
                      2:   +----------------------------------------------------------------------+
                      3:   | PHP Version 5                                                        |
                      4:   +----------------------------------------------------------------------+
                      5:   | Copyright (c) 1997-2012 The PHP Group                                |
                      6:   +----------------------------------------------------------------------+
                      7:   | This source file is subject to version 3.01 of the PHP license,      |
                      8:   | that is bundled with this package in the file LICENSE, and is        |
                      9:   | available through the world-wide-web at the following url:           |
                     10:   | http://www.php.net/license/3_01.txt                                  |
                     11:   | If you did not receive a copy of the PHP license and are unable to   |
                     12:   | obtain it through the world-wide-web, please send a note to          |
                     13:   | license@php.net so we can mail you a copy immediately.               |
                     14:   +----------------------------------------------------------------------+
                     15:   | Author: Wez Furlong <wez@thebrainroom.com>                           |
                     16:   +----------------------------------------------------------------------+
                     17: */
                     18: 
1.1.1.2 ! misho      19: /* $Id$ */
1.1       misho      20: 
                     21: /* Memory Mapping interface for streams */
                     22: #include "php.h"
                     23: #include "php_streams_int.h"
                     24: 
                     25: 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)
                     26: {
                     27:        php_stream_mmap_range range;
                     28:        
                     29:        range.offset = offset;
                     30:        range.length = length;
                     31:        range.mode = mode;
                     32:        range.mapped = NULL;
                     33: 
                     34:        /* For now, we impose an arbitrary limit to avoid
                     35:         * runaway swapping when large files are passed thru. */
                     36:        if (length > 4 * 1024 * 1024) {
                     37:                return NULL;
                     38:        }
                     39:        
                     40:        if (PHP_STREAM_OPTION_RETURN_OK == php_stream_set_option(stream, PHP_STREAM_OPTION_MMAP_API, PHP_STREAM_MMAP_MAP_RANGE, &range)) {
                     41:                if (mapped_len) {
                     42:                        *mapped_len = range.length;
                     43:                }
                     44:                return range.mapped;
                     45:        }
                     46:        return NULL;
                     47: }
                     48: 
                     49: PHPAPI int _php_stream_mmap_unmap(php_stream *stream TSRMLS_DC)
                     50: {
                     51:        return php_stream_set_option(stream, PHP_STREAM_OPTION_MMAP_API, PHP_STREAM_MMAP_UNMAP, NULL) == PHP_STREAM_OPTION_RETURN_OK ? 1 : 0;
                     52: }
                     53: 
                     54: PHPAPI int _php_stream_mmap_unmap_ex(php_stream *stream, off_t readden TSRMLS_DC)
                     55: {
                     56:        int ret = 1;
                     57: 
                     58:        if (php_stream_seek(stream, readden, SEEK_CUR) != 0) {
                     59:                ret = 0;
                     60:        }
                     61:        if (php_stream_mmap_unmap(stream) == 0) {
                     62:                ret = 0;
                     63:        }
                     64: 
                     65:        return ret;
                     66: }
                     67: 
                     68: /*
                     69:  * Local variables:
                     70:  * tab-width: 4
                     71:  * c-basic-offset: 4
                     72:  * End:
                     73:  * vim600: noet sw=4 ts=4 fdm=marker
                     74:  * vim<600: noet sw=4 ts=4
                     75:  */