#define O_WR (OPENFLAG_WRITE)
#define O_RD (OPENFLAG_READ)
#define O_CREAT (OPENFLAG_CREATE)
+#define O_RDONLY OPENFLAG_READ
+#define O_WRONLY OPENFLAG_WRITE
+#define O_TRUNC OPENFLAG_TRUNCATE
+#define O_APPEND OPENFLAG_APPEND
typedef intptr_t ssize_t;