1 files changed, 39 insertions, 0 deletions
diff --git a/libstdc++-v3/testsuite/ext/stdio_filebuf/char/79820.cc b/libstdc++-v3/testsuite/ext/stdio_filebuf/char/79820.cc
new file mode 100644
index 00000000000..ba566f869c6
--- /dev/null
+++ b/libstdc++-v3/testsuite/ext/stdio_filebuf/char/79820.cc
@@ -0,0 +1,39 @@
+// Copyright (C) 2017 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library.  This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License along
+// with this library; see the file COPYING3.  If not see
+// <http://www.gnu.org/licenses/>.
+
+// { dg-require-fileio "" }
+
+#include <ext/stdio_filebuf.h>
+#include <cstdio>
+#include <cerrno>
+#include <testsuite_hooks.h>
+
+void
+test01()
+{
+  FILE* f = std::fopen("79820.txt", "w");
+  std::fclose(f);
+  errno = 127;
+  __gnu_cxx::stdio_filebuf<char> b(f, std::ios::out, BUFSIZ);
+  VERIFY(errno == 127); // PR libstdc++/79820
+}
+
+int
+main()
+{
+  test01();
+}