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php 5.4.29

    1: /*
    2:   +----------------------------------------------------------------------+
    3:   | PHP Version 5                                                        |
    4:   +----------------------------------------------------------------------+
    5:   | Copyright (c) 1997-2014 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: 
   19: /* $Id: mmap.c,v 1.1.1.4 2014/06/15 20:04:01 misho Exp $ */
   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:  */