libstdc++-v3/testsuite/27_io/objects/wchar_t/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) 2003-2018 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 wcin.rdbuf()->sputbackc() puts characters back to stdin.
  34 // If wcin.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, "w");
  57       fputs("Whatever\n", file);
  58       fflush(file);
  59       s1.signal();
  60       s2.wait();
  61       fclose(file);
  62       s1.signal();
  63       exit(0);
  64     }
  65
  66   test &= bool( freopen(name, "r", stdin) );
  67   s1.wait();
  68
  69   wint_t c1 = fgetwc(stdin);
  70   test &= bool( c1 != WEOF );
  71   wint_t c2 = wcin.rdbuf()->sputbackc(L'a');
  72   test &= bool( c2 != WEOF );
  73   test &= bool( c2 == L'a' );
  74
  75   wint_t c3 = fgetwc(stdin);
  76   test &= bool( c3 != WEOF );
  77   test &= bool( c3 == c2 );
  78   wint_t c4 = ungetwc(L'b', stdin);
  79   test &= bool( c4 != WEOF );
  80   test &= bool( c4 == L'b' );
  81
  82   wint_t c5 = wcin.rdbuf()->sgetc();
  83   test &= bool( c5 != WEOF );
  84   test &= bool( c5 == c4 );
  85   s2.signal();
  86   s1.wait();
  87
  88   return test;
  89 }
  90
  91 int main()
  92 {
  93   return !test01();
  94 }