Annotation of embedaddon/php/main/streams/mmap.c, revision 1.1
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:
! 19: /* $Id: mmap.c 321634 2012-01-01 13:15:04Z felipe $ */
! 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: */
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