From 9e080e8aa5c219b4f621afa4730914e265fa5848 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Yannic=20Schr=C3=B6der?= <schroeder@ibr.cs.tu-bs.de>
Date: Tue, 20 Sep 2016 14:16:40 +0200
Subject: [PATCH] Terminate serialdump when serial device disconnects

The running serialdump does not recover from a disconnected device but
runs indefinitely with outputting anything. This makes it quit with a
proper error message.
---
 tools/sky/serialdump.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/tools/sky/serialdump.c b/tools/sky/serialdump.c
index deab56df4..7cc0d0e1e 100644
--- a/tools/sky/serialdump.c
+++ b/tools/sky/serialdump.c
@@ -281,6 +281,11 @@ main(int argc, char **argv)
         perror("could not read");
         exit(-1);
       }
+      if(n == 0) {
+        errno = EBADF;
+        perror("serial device disconnected");
+        exit(-1);
+      }
 
       for(i = 0; i < n; i++) {
         switch(mode) {