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) 2003-2019 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 3, 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 COPYING3.  If not see
  21 // <http://www.gnu.org/licenses/>.
  22
  23 #include <testsuite_hooks.h>
  24 #include <cstdio>
  25 #include <cstdlib>
  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 bool test01()
  37 {
  38   using namespace std;
  39   using namespace __gnu_test;
  40
  41   bool test = 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   test &= bool( child != -1 );
  53
  54   if (child == 0)
  55     {
  56       FILE* file = fopen(name, "r+");
  57       test &= bool( file != 0 );
  58       fputs("Whatever\n", file);
  59       fflush(file);
  60       s1.signal();
  61       s2.wait();
  62       fclose(file);
  63       s1.signal();
  64       exit(0);
  65     }
  66
  67   test &= bool( freopen(name, "r", stdin) );
  68   s1.wait();
  69
  70   int c1 = fgetc(stdin);
  71   test &= bool( c1 != EOF );
  72   int c2 = cin.rdbuf()->sputbackc('a');
  73   test &= bool( c2 != EOF );
  74   test &= bool( c2 == 'a' );
  75
  76   int c3 = fgetc(stdin);
  77   test &= bool( c3 != EOF );
  78   test &= bool( c3 == c2 );
  79   int c4 = ungetc('b', stdin);
  80   test &= bool( c4 != EOF );
  81   test &= bool( c4 == 'b' );
  82
  83   int c5 = cin.rdbuf()->sgetc();
  84   test &= bool( c5 != EOF );
  85   test &= bool( c5 == c4 );
  86   s2.signal();
  87   s1.wait();
  88
  89   return test;
  90 }
  91
  92 int main()
  93 {
  94   return !test01();
  95 }