libstdc++-v3/src/system_error.cc

   1 // <system_error> implementation file
   2
   3 // Copyright (C) 2007
   4 // Free Software Foundation, Inc.
   5 //
   6 // This file is part of the GNU ISO C++ Library.  This library is free
   7 // software; you can redistribute it and/or modify it under the
   8 // terms of the GNU General Public License as published by the
   9 // Free Software Foundation; either version 2, or (at your option)
  10 // any later version.
  11
  12 // This library is distributed in the hope that it will be useful,
  13 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 // GNU General Public License for more details.
  16
  17 // You should have received a copy of the GNU General Public License along
  18 // with this library; see the file COPYING.  If not, write to the Free
  19 // Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
  20 // USA.
  21
  22 // As a special exception, you may use this file as part of a free software
  23 // library without restriction.  Specifically, if other files instantiate
  24 // templates or use macros or inline functions from this file, or you compile
  25 // this file and link it with other files to produce an executable, this
  26 // file does not by itself cause the resulting executable to be covered by
  27 // the GNU General Public License.  This exception does not however
  28 // invalidate any other reasons why the executable file might be covered by
  29 // the GNU General Public License.
  30
  31 #include <cstring>
  32 #include <system_error>
  33 #include <bits/functexcept.h>
  34 #include <limits>
  35
  36 namespace
  37 {
  38   struct gnu_error_category : public std::error_category
  39   {
  40     virtual const std::string&
  41     name() const
  42     {
  43       static const std::string category("GNU");
  44       return category;
  45     }
  46
  47     virtual std::posix_errno
  48     posix(int __v) const
  49     {
  50 #ifdef _GLIBCXX_HAVE_SYS_NERR
  51       const int last_errorno = sys_nerr;
  52 #else
  53       const int last_errorno = std::numeric_limits<int>::max();
  54 #endif
  55       if (__v > 0 && __v <= last_errorno)
  56         return std::posix_errno(__v);
  57       else
  58         return std::no_posix_equivalent;
  59     }
  60   };
  61
  62   const gnu_error_category gnu_category;
  63 }
  64
  65 _GLIBCXX_BEGIN_NAMESPACE(std)
  66
  67   const error_category& system_category = gnu_category;
  68
  69   system_error::~system_error() throw() { }
  70
  71 _GLIBCXX_END_NAMESPACE