libstdc++-v3/testsuite/27_io/objects/char/9661-1.cc

   1 // 2003-04-30  Petur Runolfsson <peturr02@ru.is>
   2
   3 // Copyright (C) 2003, 2005 Free Software Foundation, Inc.
   4 //
   5 // This file is part of the GNU ISO C++ Library.  This library is free
   6 // software; you can redistribute it and/or modify it under the
   7 // terms of the GNU General Public License as published by the
   8 // Free Software Foundation; either version 2, or (at your option)
   9 // any later version.
  10
  11 // This library is distributed in the hope that it will be useful,
  12 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 // GNU General Public License for more details.
  15
  16 // You should have received a copy of the GNU General Public License along
  17 // with this library; see the file COPYING.  If not, write to the Free
  18 // Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
  19 // USA.
  20
  21 #include <testsuite_hooks.h>
  22 #include <cstdio>
  23 #include <iostream>
  24 #include <unistd.h>
  25 #include <signal.h>
  26 #include <fcntl.h>
  27 #include <sys/types.h>
  28 #include <sys/stat.h>
  29
  30 // Check that cin.rdbuf()->sputbackc() puts characters back to stdin.
  31 // If cin.rdbuf() is a filebuf, this succeeds when stdin is a regular
  32 // file, but fails otherwise, hence the named fifo.
  33 void test01()
  34 {
  35   using namespace std;
  36   using namespace __gnu_test;
  37
  38   bool test __attribute__((unused)) = true;
  39
  40   const char* name = "tmp_fifo5";
  41
  42   signal(SIGPIPE, SIG_IGN);
  43
  44   unlink(name);
  45   try_mkfifo(name, S_IRWXU);
  46   semaphore s1, s2;
  47
  48   int child = fork();
  49   VERIFY( child != -1 );
  50
  51   if (child == 0)
  52     {
  53       FILE* file = fopen(name, "r+");
  54       VERIFY (file != NULL);
  55       fputs("Whatever\n", file);
  56       fflush(file);
  57       s1.signal ();
  58       s2.wait ();
  59       fclose(file);
  60       exit(0);
  61     }
  62
  63   freopen(name, "r", stdin);
  64   s1.wait ();
  65
  66   int c1 = fgetc(stdin);
  67   VERIFY( c1 != EOF );
  68   int c2 = cin.rdbuf()->sputbackc('a');
  69   VERIFY( c2 != EOF );
  70   VERIFY( c2 == 'a' );
  71
  72   int c3 = fgetc(stdin);
  73   VERIFY( c3 != EOF );
  74   VERIFY( c3 == c2 );
  75   int c4 = ungetc('b', stdin);
  76   VERIFY( c4 != EOF );
  77   VERIFY( c4 == 'b' );
  78
  79   int c5 = cin.rdbuf()->sgetc();
  80   VERIFY( c5 != EOF );
  81   VERIFY( c5 == c4 );
  82   s2.signal ();
  83 }
  84
  85 int main()
  86 {
  87   test01();
  88   return 0;
  89 }