windows: Make unistd.h more posix compatible

- add SEEK_XXX definitions, this fixes missing definition in py/stream.c
- move R_OK from realpath.c and add W_OK/F_OK defintions
- move STDXXX_FILENO definitions from mpconfigport for consistency

1 files changed, 12 insertions, 0 deletions

diff --git a/windows/msvc/unistd.h b/windows/msvc/unistd.h
index ece86fa74..add10c884 100644
--- a/windows/msvc/unistd.h
+++ b/windows/msvc/unistd.h
@@ -26,3 +26,15 @@
 
 // There's no unistd.h, but this is the equivalent
 #include <io.h>
+
+#define F_OK 0
+#define W_OK 2
+#define R_OK 4
+
+#define STDIN_FILENO  0
+#define STDOUT_FILENO 1
+#define STDERR_FILENO 2
+
+#define SEEK_CUR 1
+#define SEEK_END 2
+#define SEEK_SET 0