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// { 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();

}