obtained gcc-4.6.4.tar.bz2 from upstream website;upstream

verified gcc-4.6.4.tar.bz2.sig;
imported gcc-4.6.4 source tree from verified upstream tarball.

downloading a git-generated archive based on the 'upstream' tag
should provide you with a source tree that is binary identical
to the one extracted from the above tarball.

if you have obtained the source via the command 'git clone',
however, do note that line-endings of files in your working
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files in the upstream repository.

1 files changed, 115 insertions, 0 deletions

diff --git a/libstdc++-v3/testsuite/27_io/basic_filebuf/underflow/char/10097.cc b/libstdc++-v3/testsuite/27_io/basic_filebuf/underflow/char/10097.cc
new file mode 100644
index 000000000..af0e9141c
--- /dev/null
+++ b/libstdc++-v3/testsuite/27_io/basic_filebuf/underflow/char/10097.cc
@@ -0,0 +1,115 @@
+// { dg-require-fork "" }
+// { dg-require-mkfifo "" }
+
+// 2001-05-21 Benjamin Kosnik  <bkoz@redhat.com>
+
+// Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2009
+// 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/>.
+
+// 27.8.1.4 Overridden virtual functions
+
+#include <fstream>
+#include <cstdlib>
+#include <unistd.h>
+#include <signal.h>
+#include <fcntl.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+
+// No asserts, avoid leaking the semaphores if a VERIFY fails.
+#undef _GLIBCXX_ASSERT
+
+#include <testsuite_hooks.h>
+
+class UnderBuf : public std::filebuf
+{
+public:
+  int_type
+  pub_underflow()
+  { return underflow(); }
+
+  std::streamsize
+  pub_showmanyc()
+  { return showmanyc(); }
+};
+
+// libstdc++/10097
+// filebuf::underflow drops characters.
+bool test16()
+{
+  using namespace std;
+  using namespace __gnu_test;
+  bool test __attribute__((unused)) = true;
+
+  const char* name = "tmp_fifo1";
+  
+  signal(SIGPIPE, SIG_IGN);
+  unlink(name);
+  
+  if (0 != mkfifo(name, S_IRWXU))
+    {
+      VERIFY( false );
+    }
+  
+  semaphore s1, s2;
+  int fval = fork();
+  if (fval == -1)
+    {
+      unlink(name);
+      VERIFY( false );
+    }
+  else if (fval == 0)
+    {
+      filebuf fbout;
+      fbout.open(name, ios_base::in|ios_base::out);
+      VERIFY( fbout.is_open() );
+      fbout.sputn("0123456789", 10);
+      fbout.pubsync();
+      s1.wait();
+      fbout.close();
+      s2.signal();
+      exit(0);
+    }
+
+  UnderBuf fb;
+  fb.open(name, ios_base::in);
+
+  fb.sgetc();
+  streamsize n = fb.pub_showmanyc();
+
+  while (n > 0)
+    {
+      --n;
+      
+      UnderBuf::int_type c = fb.pub_underflow();
+      VERIFY( c != UnderBuf::traits_type::eof() );
+      
+      fb.sbumpc();
+    }
+
+  fb.close();
+  s1.signal();
+  s2.wait();
+
+  return test;
+}
+
+int main() 
+{
+  return !test16();
+}