From 64249acad0332e3b28aa89adf3390778d8839295 Mon Sep 17 00:00:00 2001
From: Nir Cohen <nir36g@gmail.com>
Date: Tue, 17 Jan 2017 21:03:07 +0200
Subject: [PATCH] Fix empty stdin results in a hung process

---
 backtrace.py | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/backtrace.py b/backtrace.py
index 6a114cb..7c4e9ae 100644
--- a/backtrace.py
+++ b/backtrace.py
@@ -222,12 +222,17 @@ def _extract_traceback(text):
 
 
 def _stdin_hook(args):
-    output = sys.stdin.readlines()
+    if not sys.stdin.isatty():
+        output = sys.stdin.readlines()
+    else:
+        sys.exit(
+            'No input provided. Make sure you pipe stderr into '
+            'backtrace.')
 
     if TRACEBACK_IDENTIFIER not in output:
         sys.exit(
             'No Traceback detected. Make sure you pipe stderr to '
-            'backtrace correctly.')
+            'backtrace.')
 
     tb, all_else = _extract_traceback(output)
     sys.stdout.write(''.join(all_else))