96 lines
2.3 KiB
C++
96 lines
2.3 KiB
C++
// { dg-require-fork "" }
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// { dg-require-mkfifo "" }
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// 2003-04-30 Petur Runolfsson <peturr02@ru.is>
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// Copyright (C) 2003-2020 Free Software Foundation, Inc.
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//
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// This file is part of the GNU ISO C++ Library. This library is free
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// software; you can redistribute it and/or modify it under the
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// terms of the GNU General Public License as published by the
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// Free Software Foundation; either version 3, or (at your option)
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// any later version.
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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// You should have received a copy of the GNU General Public License along
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// with this library; see the file COPYING3. If not see
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// <http://www.gnu.org/licenses/>.
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#include <testsuite_hooks.h>
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#include <cstdio>
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#include <cstdlib>
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#include <iostream>
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#include <unistd.h>
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#include <signal.h>
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#include <fcntl.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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// Check that cin.rdbuf()->sputbackc() puts characters back to stdin.
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// If cin.rdbuf() is a filebuf, this succeeds when stdin is a regular
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// file, but fails otherwise, hence the named fifo.
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bool test01()
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{
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using namespace std;
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using namespace __gnu_test;
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bool test = true;
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const char* name = "tmp_fifo5";
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signal(SIGPIPE, SIG_IGN);
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unlink(name);
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mkfifo(name, S_IRWXU);
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semaphore s1, s2;
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int child = fork();
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test &= bool( child != -1 );
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if (child == 0)
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{
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FILE* file = fopen(name, "r+");
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test &= bool( file != 0 );
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fputs("Whatever\n", file);
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fflush(file);
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s1.signal();
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s2.wait();
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fclose(file);
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s1.signal();
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exit(0);
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}
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test &= bool( freopen(name, "r", stdin) );
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s1.wait();
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int c1 = fgetc(stdin);
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test &= bool( c1 != EOF );
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int c2 = cin.rdbuf()->sputbackc('a');
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test &= bool( c2 != EOF );
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test &= bool( c2 == 'a' );
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int c3 = fgetc(stdin);
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test &= bool( c3 != EOF );
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test &= bool( c3 == c2 );
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int c4 = ungetc('b', stdin);
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test &= bool( c4 != EOF );
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test &= bool( c4 == 'b' );
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int c5 = cin.rdbuf()->sgetc();
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test &= bool( c5 != EOF );
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test &= bool( c5 == c4 );
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s2.signal();
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s1.wait();
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return test;
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}
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int main()
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{
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return !test01();
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}
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