From 44ec7ce70e6b0beb13019b821c3831935f01c6f9 Mon Sep 17 00:00:00 2001
From: Michel Machado <michel@digirati.com.br>
Date: Tue, 20 May 2014 09:58:58 -0400
Subject: [PATCH] f3read: fix for Windows/Cygwin

Windows requires that the file descriptor passed to fdatasync(2)
to be writable.

Tom Hall reported the issue and proposed the solution.
---
 f3read.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/f3read.c b/f3read.c
index 60771f0..6e95385 100644
--- a/f3read.c
+++ b/f3read.c
@@ -54,7 +54,14 @@ static void validate_file(const char *path, int number,
 	full_fn_from_number(full_fn, &filename, path, number);
 	printf("Validating file %s ... %s", filename, progress ? BLANK : "");
 	fflush(stdout);
+#ifdef CYGWIN
+	/* We don't need write access, but some kernels require that
+	 * the file descriptor passed to fdatasync(2) to be writable.
+	 */
+	f = fopen(full_fn, "rb+");
+#else
 	f = fopen(full_fn, "rb");
+#endif
 	if (!f)
 		err(errno, "Can't open file %s", full_fn);
 	fd = fileno(f);