libstdc++-v3/testsuite/27_io/basic_filebuf/close/char/4879.cc

   1 // { dg-require-fork "" }
   2 // { dg-require-mkfifo "" }
   3
   4 // Copyright (C) 2001-2021 Free Software Foundation, Inc.
   5 //
   6 // This file is part of the GNU ISO C++ Library.  This library is free
   7 // software; you can redistribute it and/or modify it under the
   8 // terms of the GNU General Public License as published by the
   9 // Free Software Foundation; either version 3, or (at your option)
  10 // any later version.
  11
  12 // This library is distributed in the hope that it will be useful,
  13 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 // GNU General Public License for more details.
  16
  17 // You should have received a copy of the GNU General Public License along
  18 // with this library; see the file COPYING3.  If not see
  19 // <http://www.gnu.org/licenses/>.
  20
  21 // 27.8.1.3 filebuf member functions
  22 // @require@ %-*.tst %-*.txt
  23 // @diff@ %-*.tst %-*.txt
  24
  25 // various tests for filebuf::open() and filebuf::close() including
  26 // the non-portable functionality in the libstdc++-v3 IO library
  27
  28 #include <fstream>
  29 #include <iostream>
  30 #include <cstdlib>
  31 #include <unistd.h>
  32 #include <signal.h>
  33 #include <fcntl.h>
  34 #include <sys/types.h>
  35 #include <sys/stat.h>
  36
  37 #include <testsuite_hooks.h>
  38
  39 // libstdc++/2913, libstdc++/4879
  40 // John Fardo  <jfardo@laurelnetworks.com>, Brad Garcia <garsh@attbi.com>
  41 bool
  42 test_04()
  43 {
  44   using namespace __gnu_test;
  45
  46   bool test = true;
  47   const char* name = "tmp_fifo1";
  48   semaphore s1, s2;
  49
  50   signal(SIGPIPE, SIG_IGN);
  51
  52   unlink(name);
  53   if (0 != mkfifo(name, S_IRWXU))
  54     {
  55       std::cerr << "failed to create fifo" << std::endl;
  56       exit(-1);
  57     }
  58
  59   int fval = fork();
  60   if (fval == -1)
  61     {
  62       std::cerr << "failed to fork" << std::endl;
  63       unlink(name);
  64       return false;
  65     }
  66   else if (fval == 0)
  67     {
  68       std::ifstream ifs(name);
  69       s1.wait();
  70       ifs.close();
  71       s2.signal();
  72       exit(0);
  73     }
  74
  75   std::ofstream ofs(name);
  76   s1.signal();
  77   s2.wait();
  78   ofs.put('t');
  79
  80   /*
  81    * ISO/IED 14882:1998(E) 27.8.1.10.4
  82    *
  83    * void close();
  84    *
  85    * Effects:  Calls rdbuf()->close() and, if that function fails
  86    * (returns a null pointer), calls setstate(failbit)...
  87    */
  88   ofs.close();
  89   if (!(ofs.rdstate() & std::ios::failbit))
  90     {
  91       test = false;
  92     }
  93
  94   unlink(name);
  95
  96   return test;
  97 }
  98
  99 int
 100 main()
 101 {
 102   return !test_04();
 103 }