From 80e1c3d17c00fb4f40e6742202c7a28fc7a22585 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Kai=20M=C3=A4kisara?= <kai.makisara@kolumbus.fi>
Date: Mon, 16 Feb 2009 19:55:20 +0200
Subject: [PATCH] Check that the default tape device is a chardev

When using the default tape device (no $TAPE env. var and no explicit
tape given), check that it is indeed a character device; this will
help with better error messages on systems using udev, where /dev/tape
is a directory instead.
---
 mt.c | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/mt.c b/mt.c
index 41b85b8..cd2893f 100644
--- a/mt.c
+++ b/mt.c
@@ -319,8 +319,17 @@ main(int argc, char **argv)
 	else
 	    break;
 
-    if (tape_name == NULL && (tape_name = getenv("TAPE")) == NULL)
+    if (tape_name == NULL && (tape_name = getenv("TAPE")) == NULL) {
+	struct stat stbuf;
+
 	tape_name = DEFTAPE;
+	if (!stat(tape_name, &stbuf) &&
+	    !S_ISCHR(stbuf.st_mode)) {
+	    fprintf(stderr, "The default '%s' is not a character device.\n\n", tape_name);
+	    usage(1);
+	    exit(1);
+	}
+    }
        
     if (argn >= argc ) {
 	usage(0);