libstdc++-v3/testsuite/27_io/basic_filebuf/open/char/2.cc

   1 // Copyright (C) 2001-2023 Free Software Foundation, Inc.
   2 //
   3 // This file is part of the GNU ISO C++ Library.  This library is free
   4 // software; you can redistribute it and/or modify it under the
   5 // terms of the GNU General Public License as published by the
   6 // Free Software Foundation; either version 3, or (at your option)
   7 // any later version.
   8
   9 // This library is distributed in the hope that it will be useful,
  10 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 // GNU General Public License for more details.
  13
  14 // You should have received a copy of the GNU General Public License along
  15 // with this library; see the file COPYING3.  If not see
  16 // <http://www.gnu.org/licenses/>.
  17
  18 // 27.8.1.3 filebuf member functions
  19 // @require@ %-*.tst %-*.txt
  20 // @diff@ %-*.tst %-*.txt
  21
  22 // various tests for filebuf::open() and filebuf::close() including
  23 // the non-portable functionality in the libstdc++-v3 IO library
  24
  25 // { dg-require-fileio "" }
  26
  27 #include <fstream>
  28 #include <unistd.h>
  29 #include <signal.h>
  30 #include <fcntl.h>
  31 #include <sys/types.h>
  32 #include <sys/stat.h>
  33 #include <ext/stdio_filebuf.h>
  34 #include <testsuite_hooks.h>
  35
  36 const char name_01[] = "filebuf_virtuals-1.txt"; // file with data in it
  37
  38 void test_03()
  39 {
  40   int first_fd = ::open(name_01, O_RDONLY);
  41   VERIFY( first_fd != -1 );
  42   FILE* first_file = ::fdopen(first_fd, "r");
  43   VERIFY( first_file );
  44   __gnu_cxx::stdio_filebuf<char> fb(first_file, std::ios_base::in);
  45
  46   int second_fd = fb.fd();
  47
  48   VERIFY( first_fd == second_fd );
  49 }
  50
  51 int
  52 main()
  53 {
  54   test_03();
  55   return 0;
  56 }
  57
  58