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// { dg-require-fork "" }

// { dg-require-mkfifo "" }

// 2003-04-30  Petur Runolfsson <peturr02@ru.is>

// Copyright (C) 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/>.

// No asserts, avoid leaking the semaphores if a VERIFY fails.

#undef _GLIBCXX_ASSERT

#include <testsuite_hooks.h>

#include <cstdio>

#include <cstdlib>

#include <iostream>

#include <unistd.h>

#include <signal.h>

#include <fcntl.h>

#include <sys/types.h>

#include <sys/stat.h>

// Check that wcin.rdbuf()->sputbackc() puts characters back to stdin.

// If wcin.rdbuf() is a filebuf, this succeeds when stdin is a regular

// file, but fails otherwise, hence the named fifo.

bool test01()

{

  using namespace std;

  using namespace __gnu_test;

  bool test __attribute__((unused)) = true;

  const char* name = "tmp_fifo5";

  signal(SIGPIPE, SIG_IGN);

  unlink(name);

  mkfifo(name, S_IRWXU);

  semaphore s1, s2;

  int child = fork();

  VERIFY( child != -1 );

  if (child == 0)

    {

      FILE* file = fopen(name, "w");

      fputs("Whatever\n", file);

      fflush(file);

      s1.signal();

      s2.wait();

      fclose(file);

      s1.signal();

      exit(0);

    }

  VERIFY( freopen(name, "r", stdin) );

  s1.wait();

  wint_t c1 = fgetwc(stdin);

  VERIFY( c1 != WEOF );

  wint_t c2 = wcin.rdbuf()->sputbackc(L'a');

  VERIFY( c2 != WEOF );

  VERIFY( c2 == L'a' );

  wint_t c3 = fgetwc(stdin);

  VERIFY( c3 != WEOF );

  VERIFY( c3 == c2 );

  wint_t c4 = ungetwc(L'b', stdin);

  VERIFY( c4 != WEOF );

  VERIFY( c4 == L'b' );

  wint_t c5 = wcin.rdbuf()->sgetc();

  VERIFY( c5 != WEOF );

  VERIFY( c5 == c4 );

  s2.signal();

  s1.wait();

  return test;

}

int main()

{

  return !test01();

}