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

   1 // { dg-require-fork "" }
   2 // { dg-require-mkfifo "" }
   3
   4 // 2003-04-30  Petur Runolfsson <peturr02@ru.is>
   5
   6 // Copyright (C) 2003, 2005 Free Software Foundation, Inc.
   7 //
   8 // This file is part of the GNU ISO C++ Library.  This library is free
   9 // software; you can redistribute it and/or modify it under the
  10 // terms of the GNU General Public License as published by the
  11 // Free Software Foundation; either version 2, or (at your option)
  12 // any later version.
  13
  14 // This library is distributed in the hope that it will be useful,
  15 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  16 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17 // GNU General Public License for more details.
  18
  19 // You should have received a copy of the GNU General Public License along
  20 // with this library; see the file COPYING.  If not, write to the Free
  21 // Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
  22 // USA.
  23
  24 #include <testsuite_hooks.h>
  25 #include <cstdio>
  26 #include <iostream>
  27 #include <unistd.h>
  28 #include <signal.h>
  29 #include <fcntl.h>
  30 #include <sys/types.h>
  31 #include <sys/stat.h>
  32
  33 // Check that cin.rdbuf()->sputbackc() puts characters back to stdin.
  34 // If cin.rdbuf() is a filebuf, this succeeds when stdin is a regular
  35 // file, but fails otherwise, hence the named fifo.
  36 void test01()
  37 {
  38   using namespace std;
  39   using namespace __gnu_test;
  40
  41   bool test __attribute__((unused)) = true;
  42
  43   const char* name = "tmp_fifo5";
  44
  45   signal(SIGPIPE, SIG_IGN);
  46
  47   unlink(name);
  48   mkfifo(name, S_IRWXU);
  49   semaphore s1, s2;
  50
  51   int child = fork();
  52   VERIFY( child != -1 );
  53
  54   if (child == 0)
  55     {
  56       FILE* file = fopen(name, "r+");
  57       VERIFY (file != NULL);
  58       fputs("Whatever\n", file);
  59       fflush(file);
  60       s1.signal ();
  61       s2.wait ();
  62       fclose(file);
  63       exit(0);
  64     }
  65
  66   freopen(name, "r", stdin);
  67   s1.wait ();
  68
  69   int c1 = fgetc(stdin);
  70   VERIFY( c1 != EOF );
  71   int c2 = cin.rdbuf()->sputbackc('a');
  72   VERIFY( c2 != EOF );
  73   VERIFY( c2 == 'a' );
  74
  75   int c3 = fgetc(stdin);
  76   VERIFY( c3 != EOF );
  77   VERIFY( c3 == c2 );
  78   int c4 = ungetc('b', stdin);
  79   VERIFY( c4 != EOF );
  80   VERIFY( c4 == 'b' );
  81
  82   int c5 = cin.rdbuf()->sgetc();
  83   VERIFY( c5 != EOF );
  84   VERIFY( c5 == c4 );
  85   s2.signal ();
  86 }
  87
  88 int main()
  89 {
  90   test01();
  91   return 0;
  92 }