libstdc++-v3/testsuite/27_io/basic_filebuf/seekoff/char/26777.cc

   1 // { dg-require-fork "" }
   2 // { dg-require-mkfifo "" }
   3
   4 // 2006-03-22  Paolo Carlini  <pcarlini@suse.de>
   5
   6 // Copyright (C) 2006-2014 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 <fstream>
  28 #include <sstream>
  29 #include <cstdlib>
  30 #include <unistd.h>
  31 #include <signal.h>
  32 #include <fcntl.h>
  33 #include <sys/types.h>
  34 #include <sys/stat.h>
  35
  36 // libstdc++/26777
  37 bool test01()
  38 {
  39   using namespace std;
  40   using namespace __gnu_test;
  41
  42   bool test __attribute__((unused)) = true;
  43
  44   const char* name = "tmp_fifo6";
  45
  46   signal(SIGPIPE, SIG_IGN);
  47
  48   unlink(name);
  49   mkfifo(name, S_IRWXU);
  50   semaphore s1, s2;
  51
  52   int child = fork();
  53   VERIFY( child != -1 );
  54
  55   if (child == 0)
  56     {
  57       filebuf fbout;
  58       fbout.open(name, ios_base::in | ios_base::out);
  59       VERIFY( fbout.is_open() );
  60       fbout.sputn("Whatever", 8);
  61       fbout.pubsync();
  62       s1.signal();
  63       s2.wait();
  64       fbout.close();
  65       s1.signal();
  66       exit(0);
  67     }
  68
  69   filebuf fbin;
  70   fbin.open(name, ios::in);
  71   s1.wait();
  72
  73   fbin.sgetc();
  74   fbin.pubseekoff(0, ios::cur, ios::in);
  75   s2.signal();
  76   s1.wait();
  77
  78   ostringstream oss;
  79   oss << &fbin;
  80   fbin.close();
  81
  82   VERIFY( oss.str() == "Whatever" );
  83
  84   return test;
  85 }
  86
  87 int main()
  88 {
  89   return !test01();
  90 }