libstdc++-v3/testsuite/27_io/basic_filebuf/underflow/char/10097.cc

   1 // 2001-05-21 Benjamin Kosnik  <bkoz@redhat.com>
   2
   3 // Copyright (C) 2001, 2002, 2003, 2005 Free Software Foundation, Inc.
   4 //
   5 // This file is part of the GNU ISO C++ Library.  This library is free
   6 // software; you can redistribute it and/or modify it under the
   7 // terms of the GNU General Public License as published by the
   8 // Free Software Foundation; either version 2, or (at your option)
   9 // any later version.
  10
  11 // This library is distributed in the hope that it will be useful,
  12 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 // GNU General Public License for more details.
  15
  16 // You should have received a copy of the GNU General Public License along
  17 // with this library; see the file COPYING.  If not, write to the Free
  18 // Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
  19 // USA.
  20
  21 // 27.8.1.4 Overridden virtual functions
  22
  23 #include <fstream>
  24 #include <unistd.h>
  25 #include <signal.h>
  26 #include <fcntl.h>
  27 #include <sys/types.h>
  28 #include <sys/stat.h>
  29 #include <testsuite_hooks.h>
  30
  31 class UnderBuf : public std::filebuf
  32 {
  33 public:
  34   int_type
  35   pub_underflow()
  36   { return underflow(); }
  37
  38   std::streamsize
  39   pub_showmanyc()
  40   { return showmanyc(); }
  41 };
  42
  43 // libstdc++/10097
  44 // filebuf::underflow drops characters.
  45 void test16()
  46 {
  47   using namespace std;
  48   using namespace __gnu_test;
  49   bool test __attribute__((unused)) = true;
  50
  51   const char* name = "tmp_fifo1";
  52
  53   signal(SIGPIPE, SIG_IGN);
  54   unlink(name);
  55
  56   if (0 != try_mkfifo(name, S_IRWXU))
  57     {
  58       VERIFY( false );
  59     }
  60
  61   semaphore s1;
  62   int fval = fork();
  63   if (fval == -1)
  64     {
  65       unlink(name);
  66       VERIFY( false );
  67     }
  68   else if (fval == 0)
  69     {
  70       filebuf fbout;
  71       fbout.open(name, ios_base::in|ios_base::out);
  72       VERIFY ( fbout.is_open() );
  73       fbout.sputn("0123456789", 10);
  74       fbout.pubsync();
  75       s1.wait ();
  76       fbout.close();
  77       exit(0);
  78     }
  79
  80   UnderBuf fb;
  81   fb.open(name, ios_base::in);
  82
  83   fb.sgetc();
  84   streamsize n = fb.pub_showmanyc();
  85
  86   while (n > 0)
  87     {
  88       --n;
  89
  90       UnderBuf::int_type c = fb.pub_underflow();
  91       VERIFY( c != UnderBuf::traits_type::eof() );
  92
  93       fb.sbumpc();
  94     }
  95
  96   fb.close();
  97   s1.signal ();
  98 }
  99
 100 int main()
 101 {
 102   test16();
 103   return 0;
 104 }