添加rtthread相关代码

riscv/rtthread/components/libc/compilers/newlib/fcntl.h

@@ -0,0 +1,36 @@
+/*
+ * Copyright (c) 2006-2021, RT-Thread Development Team
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2021-09-02     Meco Man     First version
+ */
+
+#ifndef __FCNTL_H__
+#define __FCNTL_H__
+
+#include <sys/_default_fcntl.h>
+
+#ifndef O_EXEC
+#define O_EXEC      0x400000
+#endif
+
+#ifndef O_TMPFILE
+#define O_TMPFILE   0x800000
+#endif
+
+#ifndef O_BINARY
+#define O_BINARY 0x10000
+#endif
+
+#ifndef O_NOFOLLOW
+#define O_NOFOLLOW 0x100000
+#endif
+
+#ifndef O_DIRECTORY
+#define O_DIRECTORY 0x200000
+#endif
+
+#endif