From 1cdbeecc8580746359f484496f1866f754da80a2 Mon Sep 17 00:00:00 2001
From: David Wells <wellsd2@rpi.edu>
Date: Thu, 16 Mar 2017 18:22:39 -0400
Subject: [PATCH] Check that we successfully created a directory.

---
 examples/step-42/step-42.cc | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/examples/step-42/step-42.cc b/examples/step-42/step-42.cc
index a238022859..33220e4dae 100644
--- a/examples/step-42/step-42.cc
+++ b/examples/step-42/step-42.cc
@@ -876,7 +876,8 @@ namespace Step42
     output_dir = prm.get("output directory");
     if (output_dir != "" && *(output_dir.rbegin()) != '/')
       output_dir += "/";
-    mkdir(output_dir.c_str(), 0777);
+    const int ierr = mkdir(output_dir.c_str(), 0777);
+    AssertThrow(ierr == 0, ExcIO());
 
     pcout << "    Using output directory '" << output_dir << "'" << std::endl;
     pcout << "    FE degree " << fe_degree << std::endl;
-- 
2.39.5