From 8938562563541f855e567662c6e13e0949413ec5 Mon Sep 17 00:00:00 2001
From: deuce <>
Date: Mon, 27 Mar 2006 01:19:09 +0000
Subject: [PATCH] Add logic table comment for sopen(). Eventually, that's how
it *should* work.
---
src/xpdev/filewrap.c | 28 ++++++++++++++++++++++++++++
1 file changed, 28 insertions(+)
diff --git a/src/xpdev/filewrap.c b/src/xpdev/filewrap.c
index 6d642a992b..6efd714345 100644
--- a/src/xpdev/filewrap.c
+++ b/src/xpdev/filewrap.c
@@ -144,6 +144,34 @@ int DLLCALL unlock(int fd, long pos, long len)
}
/* Opens a file in specified sharing (file-locking) mode */
+/*
+ * This is how it *SHOULD* work:
+ * Values of DOS 2-6.22 file sharing behavior:
+ * | Second and subsequent Opens
+ * First |Compat Deny Deny Deny Deny
+ * Open | All Write Read None
+ * |R W RW R W RW R W RW R W RW R W RW
+ * - - - - -| - - - - - - - - - - - - - - - - -
+ * Compat R |Y Y Y N N N 1 N N N N N 1 N N
+ * W |Y Y Y N N N N N N N N N N N N
+ * RW|Y Y Y N N N N N N N N N N N N
+ * - - - - -|
+ * Deny R |C C C N N N N N N N N N N N N
+ * All W |C C C N N N N N N N N N N N N
+ * RW|C C C N N N N N N N N N N N N
+ * - - - - -|
+ * Deny R |2 C C N N N Y N N N N N Y N N
+ * Write W |C C C N N N N N N Y N N Y N N
+ * RW|C C C N N N N N N N N N Y N N
+ * - - - - -|
+ * Deny R |C C C N N N N Y N N N N N Y N
+ * Read W |C C C N N N N N N N Y N N Y N
+ * RW|C C C N N N N N N N N N N Y N
+ * - - - - -|
+ * Deny R |2 C C N N N Y Y Y N N N Y Y Y
+ * None W |C C C N N N N N N Y Y Y Y Y Y
+ * RW|C C C N N N N N N N N N Y Y Y
+ */
#if !defined(__QNX__)
int DLLCALL sopen(const char *fn, int access, int share, ...)
{
--
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