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) 2006-2022 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 <fstream>
  25 #include <sstream>
  26 #include <cstdlib>
  27 #include <unistd.h>
  28 #include <signal.h>
  29 #include <fcntl.h>
  30 #include <sys/types.h>
  31 #include <sys/stat.h>
  32
  33 // libstdc++/26777
  34 bool test01()
  35 {
  36   using namespace std;
  37   using namespace __gnu_test;
  38
  39   bool test = true;
  40
  41   const char* name = "tmp_fifo6";
  42
  43   signal(SIGPIPE, SIG_IGN);
  44
  45   unlink(name);
  46   mkfifo(name, S_IRWXU);
  47   semaphore s1, s2;
  48
  49   int child = fork();
  50   test &= bool( child != -1 );
  51
  52   if (child == 0)
  53     {
  54       filebuf fbout;
  55       fbout.open(name, ios_base::in | ios_base::out);
  56       test &= bool( fbout.is_open() );
  57       fbout.sputn("Whatever", 8);
  58       fbout.pubsync();
  59       s1.signal();
  60       s2.wait();
  61       fbout.close();
  62       s1.signal();
  63       exit(0);
  64     }
  65
  66   filebuf fbin;
  67   fbin.open(name, ios::in);
  68   s1.wait();
  69
  70   fbin.sgetc();
  71   fbin.pubseekoff(0, ios::cur, ios::in);
  72   s2.signal();
  73   s1.wait();
  74
  75   ostringstream oss;
  76   oss << &fbin;
  77   fbin.close();
  78
  79   test &= bool( oss.str() == "Whatever" );
  80
  81   return test;
  82 }
  83
  84 int main()
  85 {
  86   return !test01();
  87 }