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

   1 // { dg-require-fork "" }
   2 // { dg-require-mkfifo "" }
   3
   4 // 2001-05-21 Benjamin Kosnik  <bkoz@redhat.com>
   5
   6 // Copyright (C) 2001, 2002, 2003, 2005 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 2, 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 COPYING.  If not, write to the Free
  21 // Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
  22 // USA.
  23
  24 // 27.8.1.4 Overridden virtual functions
  25
  26 #include <fstream>
  27 #include <unistd.h>
  28 #include <signal.h>
  29 #include <fcntl.h>
  30 #include <sys/types.h>
  31 #include <sys/stat.h>
  32 #include <testsuite_hooks.h>
  33
  34 class UnderBuf : public std::filebuf
  35 {
  36 public:
  37   int_type
  38   pub_underflow()
  39   { return underflow(); }
  40
  41   std::streamsize
  42   pub_showmanyc()
  43   { return showmanyc(); }
  44 };
  45
  46 // libstdc++/10097
  47 // filebuf::underflow drops characters.
  48 void test16()
  49 {
  50   using namespace std;
  51   using namespace __gnu_test;
  52   bool test __attribute__((unused)) = true;
  53
  54   const char* name = "tmp_fifo1";
  55
  56   signal(SIGPIPE, SIG_IGN);
  57   unlink(name);
  58
  59   if (0 != mkfifo(name, S_IRWXU))
  60     {
  61       VERIFY( false );
  62     }
  63
  64   semaphore s1;
  65   int fval = fork();
  66   if (fval == -1)
  67     {
  68       unlink(name);
  69       VERIFY( false );
  70     }
  71   else if (fval == 0)
  72     {
  73       filebuf fbout;
  74       fbout.open(name, ios_base::in|ios_base::out);
  75       VERIFY ( fbout.is_open() );
  76       fbout.sputn("0123456789", 10);
  77       fbout.pubsync();
  78       s1.wait ();
  79       fbout.close();
  80       exit(0);
  81     }
  82
  83   UnderBuf fb;
  84   fb.open(name, ios_base::in);
  85
  86   fb.sgetc();
  87   streamsize n = fb.pub_showmanyc();
  88
  89   while (n > 0)
  90     {
  91       --n;
  92
  93       UnderBuf::int_type c = fb.pub_underflow();
  94       VERIFY( c != UnderBuf::traits_type::eof() );
  95
  96       fb.sbumpc();
  97     }
  98
  99   fb.close();
 100   s1.signal ();
 101 }
 102
 103 int main()
 104 {
 105   test16();
 106   return 0;
 107 }