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1//
2// closeall.cpp
3//
4// Copyright (c) Microsoft Corporation. All rights reserved.
5//
6// Defines _fcloseall(), which closes all opened files.
7//
8#include <corecrt_internal_stdio.h>
9
10
11
12// Closes all streams currently open except for stdin, stdout, and stderr. All
13// tmpfile()-created streams are closed as well. Returns EOF on failure; returns
14// the number of closed streams on success.
15extern "C" int __cdecl _fcloseall()
16{
17 int count = 0;
18
19 __acrt_lock(__acrt_stdio_index_lock);
20 __try
21 {
22 for (int i = _IOB_ENTRIES; i != _nstream; ++i)
23 {
24 if (__piob[i] == nullptr)
25 continue;
26
27 // If the stream is in use, close it:
28 if (__crt_stdio_stream(__piob[i]).is_in_use() && fclose(&__piob[i]->_public_file) != EOF)
29 {
30 ++count;
31 }
32
33 DeleteCriticalSection(&__piob[i]->_lock);
34 _free_crt(__piob[i]);
35 __piob[i] = nullptr;
36 }
37 }
38 __finally
39 {
40 __acrt_unlock(__acrt_stdio_index_lock);
41 }
42 __endtry
43
44 return count;
45}