mirror of https://github.com/python/cpython
Issue #9566: _winapi.WriteFile() now truncates length to DWORD_MAX (4294967295)
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@ -62,6 +62,8 @@
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#define T_HANDLE T_POINTER
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#define DWORD_MAX 4294967295U
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/* Grab CancelIoEx dynamically from kernel32 */
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static int has_CancelIoEx = -1;
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static BOOL (CALLBACK *Py_CancelIoEx)(HANDLE, LPOVERLAPPED);
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@ -1142,7 +1144,7 @@ winapi_WriteFile(PyObject *self, PyObject *args, PyObject *kwds)
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HANDLE handle;
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Py_buffer _buf, *buf;
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PyObject *bufobj;
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DWORD written;
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DWORD len, written;
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BOOL ret;
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int use_overlapped = 0;
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DWORD err;
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@ -1170,7 +1172,8 @@ winapi_WriteFile(PyObject *self, PyObject *args, PyObject *kwds)
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}
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Py_BEGIN_ALLOW_THREADS
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ret = WriteFile(handle, buf->buf, buf->len, &written,
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len = (DWORD)Py_MIN(buf->len, DWORD_MAX);
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ret = WriteFile(handle, buf->buf, len, &written,
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overlapped ? &overlapped->overlapped : NULL);
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Py_END_ALLOW_THREADS
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