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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, 2010
// 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 cin.rdbuf()->sputbackc() puts characters back to stdin.
// If cin.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, "r+");
VERIFY( file != 0 );
fputs("Whatever\n", file);
fflush(file);
s1.signal();
s2.wait();
fclose(file);
s1.signal();
exit(0);
}
VERIFY( freopen(name, "r", stdin) );
s1.wait();
int c1 = fgetc(stdin);
VERIFY( c1 != EOF );
int c2 = cin.rdbuf()->sputbackc('a');
VERIFY( c2 != EOF );
VERIFY( c2 == 'a' );
int c3 = fgetc(stdin);
VERIFY( c3 != EOF );
VERIFY( c3 == c2 );
int c4 = ungetc('b', stdin);
VERIFY( c4 != EOF );
VERIFY( c4 == 'b' );
int c5 = cin.rdbuf()->sgetc();
VERIFY( c5 != EOF );
VERIFY( c5 == c4 );
s2.signal();
s1.wait();
return test;
}
int main()
{
return !test01();
}
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