libstdc++-v3/testsuite/27_io/basic_filebuf/open/char/9507.cc

   1 // { dg-require-mkfifo "" }
   2
   3 // Copyright (C) 2001-2019 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 3, 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 COPYING3.  If not see
  18 // <http://www.gnu.org/licenses/>.
  19
  20 // 27.8.1.3 filebuf member functions
  21 // @require@ %-*.tst %-*.txt
  22 // @diff@ %-*.tst %-*.txt
  23
  24 // various tests for filebuf::open() and filebuf::close() including
  25 // the non-portable functionality in the libstdc++-v3 IO library
  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 <testsuite_hooks.h>
  34
  35 // libstdc++/9507
  36 void test_06()
  37 {
  38   using namespace __gnu_test;
  39   const char* name = "tmp_fifo2";
  40
  41   signal(SIGPIPE, SIG_IGN);
  42
  43   unlink(name);
  44   mkfifo(name, S_IRWXU);
  45
  46   std::filebuf fbuf;
  47   // The use of ios_base::ate implies an attempt to seek on the file
  48   // descriptor.  The seek will fail.  Thus, at the OS level, this
  49   // call to "fbuf.open" will result in a call to "open" (which will
  50   // succeed), a call to "lseek" (which will fail), and, finally, a
  51   // call to "close" (which will succeed).  Thus, after this call, the
  52   // file should be closed.
  53   std::filebuf* r = fbuf.open(name,
  54                               std::ios_base::in
  55                               | std::ios_base::out
  56                               | std::ios_base::ate);
  57   if (!r)
  58     VERIFY( !fbuf.is_open() );
  59   else
  60     VERIFY( fbuf.is_open() );
  61 }
  62
  63 int
  64 main()
  65 {
  66   test_06();
  67   return 0;
  68 }
  69
  70