// <system_error> -*- C++ -*-

// Copyright (C) 2007 Free Software Foundation, Inc.
//
// This file is part of the GNU ISO C++ Library.  This library is free
// software; you can redistribute it and/or modify it under the
// terms of the GNU General Public License as published by the
// Free Software Foundation; either version 2, or (at your option)
// any later version.

// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.

// You should have received a copy of the GNU General Public License
// along with this library; see the file COPYING.  If not, write to
// the Free Software Foundation, 51 Franklin Street, Fifth Floor,
// Boston, MA 02110-1301, USA.

// As a special exception, you may use this file as part of a free software
// library without restriction.  Specifically, if other files instantiate
// templates or use macros or inline functions from this file, or you compile
// this file and link it with other files to produce an executable, this
// file does not by itself cause the resulting executable to be covered by
// the GNU General Public License.  This exception does not however
// invalidate any other reasons why the executable file might be covered by
// the GNU General Public License.

/** @file include/system_error
 *  This is a Standard C++ Library header.
 */

#ifndef _GLIBCXX_SYSTEM_ERROR
#define _GLIBCXX_SYSTEM_ERROR 1

#pragma GCC system_header

#ifndef __GXX_EXPERIMENTAL_CXX0X__
# include <c++0x_warning.h>
#endif

#include <bits/c++config.h>
#include <cerrno>
#include <iosfwd>
#include <stdexcept>

_GLIBCXX_BEGIN_NAMESPACE(std)

  class system_error;
  class error_code;
  class error_category;

  extern const error_category& system_category;

  enum posix_errno
    {
      address_family_not_supported = 		EAFNOSUPPORT,
      address_in_use = 				EADDRINUSE,
      address_not_available = 			EADDRNOTAVAIL,
      already_connected = 			EISCONN,
      argument_list_too_long = 			E2BIG,
      argument_out_of_domain = 			EDOM,
      bad_address = 				EFAULT,
      bad_file_descriptor = 			EBADF,
      bad_message = 				EBADMSG,
      broken_pipe = 				EPIPE,
      connection_aborted = 			ECONNABORTED,
      connection_already_in_progress = 		EALREADY,
      connection_refused = 			ECONNREFUSED,
      connection_reset = 			ECONNRESET,
      cross_device_link = 			EXDEV,
      destination_address_required = 		EDESTADDRREQ,
      device_or_resource_busy = 		EBUSY,
      directory_not_empty = 			ENOTEMPTY,
      executable_format_error = 		ENOEXEC,
      file_exists = 	       			EEXIST,
      file_too_large = 				EFBIG,
      filename_too_long = 			ENAMETOOLONG,
      function_not_supported = 			ENOSYS,
      host_unreachable = 			EHOSTUNREACH,
      identifier_removed = 			EIDRM,
      illegal_byte_sequence = 			EILSEQ,
      inappropriate_io_control_operation = 	ENOTTY,
      interrupted = 				EINTR,
      invalid_argument = 			EINVAL,
      invalid_seek = 				ESPIPE,
      io_error = 				EIO,
      is_a_directory = 				EISDIR,
      message_size = 				EMSGSIZE,
      network_down = 				ENETDOWN,
      network_reset = 				ENETRESET,
      network_unreachable = 			ENETUNREACH,
      no_buffer_space = 			ENOBUFS,
      no_child_process = 			ECHILD,

#ifdef _GLIBCXX_HAVE_ENOLINK
      no_link = 				ENOLINK,
#endif
      no_lock_available = 			ENOLCK,

#ifdef _GLIBCXX_HAVE_ENODATA
      no_message_available = 			ENODATA, 
#endif

      no_message = 				ENOMSG, 
      no_protocol_option = 			ENOPROTOOPT,
      no_space_on_device = 			ENOSPC,

#ifdef _GLIBCXX_HAVE_ENOSR
      no_stream_resources = 			ENOSR,
#endif

      no_such_device_or_address = 		ENXIO,
      no_such_device = 				ENODEV,
      no_such_file_or_directory = 		ENOENT,
      no_such_process = 			ESRCH,
      not_a_directory = 			ENOTDIR,
      not_a_socket = 				ENOTSOCK,

#ifdef _GLIBCXX_HAVE_ENOSTR
      not_a_stream = 				ENOSTR,
#endif

      not_connected = 				ENOTCONN,
      not_enough_memory = 			ENOMEM,
      not_supported = 				ENOTSUP,
      operation_canceled = 			ECANCELED,
      operation_in_progress = 			EINPROGRESS,
      operation_not_permitted = 		EPERM,
      operation_not_supported = 		EOPNOTSUPP,
      operation_would_block = 			EWOULDBLOCK,
#ifdef _GLIBCXX_HAVE_EOWNERDEAD
      owner_dead = 				EOWNERDEAD,
#endif
      permission_denied = 			EACCES,
#ifdef _GLIBCXX_HAVE_EPROTO
      protocol_error = 				EPROTO,
#endif
      protocol_not_supported = 			EPROTONOSUPPORT,
      read_only_file_system = 			EROFS,
      resource_deadlock_would_occur = 		EDEADLK,
      resource_unavailable_try_again = 		EAGAIN,
      result_out_of_range = 			ERANGE,
#ifdef _GLIBCXX_HAVE_ENOTRECOVERABLE
      state_not_recoverable = 			ENOTRECOVERABLE,
#endif

#ifdef _GLIBCXX_HAVE_ETIME
      stream_timeout = 				ETIME,
#endif

      text_file_busy = 				ETXTBSY,
      timed_out = 				ETIMEDOUT,
      too_many_files_open_in_system = 		ENFILE,
      too_many_files_open = 			EMFILE,
      too_many_links = 				EMLINK,
      too_many_synbolic_link_levels = 		ELOOP,
      value_too_large = 			EOVERFLOW,
      wrong_protocol_type = 			EPROTOTYPE,
      no_posix_equivalent = 1L << 16
    };

  struct error_category
  {
    error_category() { }

    bool 
    operator==(const error_category& __other) const
    { return this == &__other; }

    bool 
    operator!=(const error_category& __other) const
    { return this != &__other; }

    virtual posix_errno 
    posix(int __v) const = 0;

    virtual const string& 
    name() const = 0;

  private:
    error_category(const error_category&);

    error_category& 
    operator=(const error_category&);
  };

  struct error_code
  {
    error_code() throw()
    : _M_value(0), _M_cat(&system_category) { }

    error_code(int __v, const error_category& __cat) throw()
    : _M_value(__v), _M_cat(&__cat) { }

    error_code(posix_errno __v)
    : _M_value(__v), _M_cat(&system_category) { }

    void 
    assign(int __v, const error_category& __cat) throw()
    {
      _M_value = __v;
      _M_cat = &__cat; 
    }

    void 
    clear() throw()
    { 
      _M_value = 0;
      _M_cat = &system_category;
   } 

    int
    value() const throw() { return _M_value; }
      
    const error_category&  
    category() const { return *_M_cat; }

    posix_errno            
    posix() const throw() { return this->category().posix(_M_value); }

    // Safe bool idiom.
    // explicit operator bool() const throw()
    // { return _M_value != 0; }
    typedef void (*__bool_type)();

    static void __not_bool_type() { }

    operator __bool_type() const throw()
    { return _M_value != 0 ? &__not_bool_type : false; }

    bool operator==(const error_code& __other) const
    { return value() == __other.value() && category() == __other.category(); }

    bool operator!=(const error_code& __other) const
    { return !(this == &__other); }

  private:
    int            		_M_value;
    const error_category* 	_M_cat;
  };

  class system_error : public std::runtime_error
  {
  private:
    error_code 	_M_code;

  public:
    system_error(const string& __what, error_code __ec = error_code())
    : runtime_error(__what), _M_code(__ec) { }

    system_error(const string& __what, int __v, const error_category& __ecat)
    : runtime_error(__what), _M_code(error_code(__v, __ecat)) { }

    virtual ~system_error() throw();

    const error_code& 
    code() const throw() { return _M_code; }
  };

_GLIBCXX_END_NAMESPACE

#endif