From 710e9b2b5c16f74f66420c66d12455ad518d42c7 Mon Sep 17 00:00:00 2001
From: dzwdz
Date: Sun, 2 Oct 2022 19:25:17 +0200
Subject: syscall/open: add the full suite of READ/WRITE flags

---
 src/shared/include/camellia/flags.h | 19 ++++++++++++++++---
 1 file changed, 16 insertions(+), 3 deletions(-)

(limited to 'src/shared')

diff --git a/src/shared/include/camellia/flags.h b/src/shared/include/camellia/flags.h
index 0eaa02e..b7cc42d 100644
--- a/src/shared/include/camellia/flags.h
+++ b/src/shared/include/camellia/flags.h
@@ -10,7 +10,20 @@
 
 #define WRITE_TRUNCATE 1
 
-#define OPEN_CREATE 1
-#define OPEN_RO 2
-
 #define FSR_DELEGATE 1
+
+
+#define OPEN_READ 1
+#define OPEN_WRITE 2
+#define OPEN_RW 3
+/* not setting OPEN_READ nor OPEN_WRITE works as if OPEN_READ was set, but it also checks the execute bit.
+ * same as in plan9. */
+#define OPEN_EXEC 0
+
+#define OPEN_READABLE(flags) ((flags & 3) != OPEN_WRITE)
+#define OPEN_WRITEABLE(flags) (flags & OPEN_WRITE)
+
+/* Requires OPEN_WRITE to be set, enforced by the kernel.
+ * The idea is that if all flags which allow modifying the filesystem state require
+ * OPEN_WRITE to be set, filesystem handlers could just check for the OPEN_WRITE flag. */
+#define OPEN_CREATE 4
-- 
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