Update os.h
Provide shared read access to log files under windows
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		@@ -120,7 +120,8 @@ constexpr inline unsigned short eol_size()
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inline int fopen_s(FILE** fp, const std::string& filename, const char* mode)
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					inline int fopen_s(FILE** fp, const std::string& filename, const char* mode)
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{
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					{
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#ifdef _WIN32
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					#ifdef _WIN32
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    return ::fopen_s(fp, filename.c_str(), mode);
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					    *fp = _fsopen((filename.c_str()), mode, _SH_DENYWR);
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					    return *fp == nullptr;
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#else
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					#else
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    *fp = fopen((filename.c_str()), mode);
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					    *fp = fopen((filename.c_str()), mode);
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    return *fp == nullptr;
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					    return *fp == nullptr;
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