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) 2003-2014 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 // No asserts, avoid leaking the semaphores if a VERIFY fails.
  24 #undef _GLIBCXX_ASSERT
  25
  26 #include <testsuite_hooks.h>
  27 #include <cstdio>
  28 #include <cstdlib>
  29 #include <iostream>
  30 #include <unistd.h>
  31 #include <signal.h>
  32 #include <fcntl.h>
  33 #include <sys/types.h>
  34 #include <sys/stat.h>
  35
  36 // Check that wcin.rdbuf()->sputbackc() puts characters back to stdin.
  37 // If wcin.rdbuf() is a filebuf, this succeeds when stdin is a regular
  38 // file, but fails otherwise, hence the named fifo.
  39 bool test01()
  40 {
  41   using namespace std;
  42   using namespace __gnu_test;
  43
  44   bool test __attribute__((unused)) = true;
  45
  46   const char* name = "tmp_fifo5";
  47
  48   signal(SIGPIPE, SIG_IGN);
  49
  50   unlink(name);
  51   mkfifo(name, S_IRWXU);
  52   semaphore s1, s2;
  53
  54   int child = fork();
  55   VERIFY( child != -1 );
  56
  57   if (child == 0)
  58     {
  59       FILE* file = fopen(name, "w");
  60       fputs("Whatever\n", file);
  61       fflush(file);
  62       s1.signal();
  63       s2.wait();
  64       fclose(file);
  65       s1.signal();
  66       exit(0);
  67     }
  68
  69   VERIFY( freopen(name, "r", stdin) );
  70   s1.wait();
  71
  72   wint_t c1 = fgetwc(stdin);
  73   VERIFY( c1 != WEOF );
  74   wint_t c2 = wcin.rdbuf()->sputbackc(L'a');
  75   VERIFY( c2 != WEOF );
  76   VERIFY( c2 == L'a' );
  77
  78   wint_t c3 = fgetwc(stdin);
  79   VERIFY( c3 != WEOF );
  80   VERIFY( c3 == c2 );
  81   wint_t c4 = ungetwc(L'b', stdin);
  82   VERIFY( c4 != WEOF );
  83   VERIFY( c4 == L'b' );
  84
  85   wint_t c5 = wcin.rdbuf()->sgetc();
  86   VERIFY( c5 != WEOF );
  87   VERIFY( c5 == c4 );
  88   s2.signal();
  89   s1.wait();
  90
  91   return test;
  92 }
  93
  94 int main()
  95 {
  96   return !test01();
  97 }