error_code.cpp

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//  error_code support implementation file  ----------------------------------//

//  Copyright Beman Dawes 2002, 2006

//  Distributed under the Boost Software License, Version 1.0. (See accompanying
//  file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)

//  See library home page at http://www.boost.org/libs/system

//----------------------------------------------------------------------------//

#include <boost/config/warning_disable.hpp>

// define BOOST_SYSTEM_SOURCE so that <boost/system/config.hpp> knows
// the library is being built (possibly exporting rather than importing code)
#define BOOST_SYSTEM_SOURCE 

#include <boost/system/config.hpp>
#include <boost/system/error_code.hpp>
#include <boost/cerrno.hpp>
#include <vector>
#include <cstdlib>
#include <cassert>

using namespace boost::system;
using namespace boost::system::posix_error;

#include <cstring> // for strerror/strerror_r

# if defined( BOOST_WINDOWS_API )
#   include <windows.h>
#   ifndef ERROR_INCORRECT_SIZE
#    define ERROR_INCORRECT_SIZE ERROR_BAD_ARGUMENTS
#   endif
# endif

//----------------------------------------------------------------------------//

namespace
{
  //  standard error categories  ---------------------------------------------//

  class generic_error_category : public error_category
  {
  public:
    generic_error_category(){}
    const char *   name() const;
    std::string    message( int ev ) const;
  };

  class system_error_category : public error_category
  {
  public:
    system_error_category(){}
    const char *        name() const;
    std::string         message( int ev ) const;
    error_condition     default_error_condition( int ev ) const;
  };

  //  generic_error_category implementation  ---------------------------------//

  const char * generic_error_category::name() const
  {
    return "generic";
  }

  std::string generic_error_category::message( int ev ) const
  {
    static std::string unknown_err( "Unknown error" );
  // strerror_r is preferred because it is always thread safe,
  // however, we fallback to strerror in certain cases because:
  //   -- Windows doesn't provide strerror_r.
  //   -- HP and Sundo provide strerror_r on newer systems, but there is
  //      no way to tell if is available at runtime and in any case their
  //      versions of strerror are thread safe anyhow.
  //   -- Linux only sometimes provides strerror_r.
  //   -- Tru64 provides strerror_r only when compiled -pthread.
  //   -- VMS doesn't provide strerror_r, but on this platform, strerror is
  //      thread safe.
  # if defined(BOOST_WINDOWS_API) || defined(__hpux) || defined(__sun)\
     || (defined(__linux) && (!defined(__USE_XOPEN2K) || defined(BOOST_SYSTEM_USE_STRERROR)))\
     || (defined(__osf__) && !defined(_REENTRANT))\
     || (defined(__vms))
      const char * c_str = std::strerror( ev );
      return  c_str
        ? std::string( c_str )
        : unknown_err;
  # else  // use strerror_r
      char buf[64];
      char * bp = buf;
      std::size_t sz = sizeof(buf);
  #  if defined(__CYGWIN__) || defined(__USE_GNU)
      // Oddball version of strerror_r
      const char * c_str = strerror_r( ev, bp, sz );
      return  c_str
        ? std::string( c_str )
        : unknown_err;
  #  else
      // POSIX version of strerror_r
      int result;
      for (;;)
      {
        // strerror_r returns 0 on success, otherwise ERANGE if buffer too small,
        // invalid_argument if ev not a valid error number
  #  if defined (__sgi)
        const char * c_str = strerror( ev );
        result = 0;
      return  c_str
        ? std::string( c_str )
        : unknown_err;
  #  else
        result = strerror_r( ev, bp, sz );
  #  endif
        if (result == 0 )
          break;
        else
        {
  #  if defined(__linux)
          // Linux strerror_r returns -1 on error, with error number in errno
          result = errno;
  #  endif
          if ( result !=  ERANGE ) break;
          if ( sz > sizeof(buf) ) std::free( bp );
          sz *= 2;
          if ( (bp = static_cast<char*>(std::malloc( sz ))) == 0 )
            return std::string( "ENOMEM" );
        }
      }
      std::string msg;
      try
      {
        msg = ( ( result == invalid_argument ) ? "Unknown error" : bp );
      }

#   ifndef BOOST_NO_EXCEPTIONS
      // See ticket #2098
      catch(...)
      {
        // just eat the exception
      }
#   endif

      if ( sz > sizeof(buf) ) std::free( bp );
      sz = 0;
      return msg;
  #  endif   // else POSIX version of strerror_r
  # endif  // else use strerror_r
  }
  //  system_error_category implementation  --------------------------------// 

  const char * system_error_category::name() const
  {
    return "system";
  }

  error_condition system_error_category::default_error_condition( int ev ) const
  {
    switch ( ev )
    {
    case 0: return make_error_condition( success );
  # if defined(BOOST_POSIX_API)
    // POSIX-like O/S -> posix_errno decode table  ---------------------------//
    case E2BIG: return make_error_condition( argument_list_too_long );
    case EACCES: return make_error_condition( permission_denied );
    case EADDRINUSE: return make_error_condition( address_in_use );
    case EADDRNOTAVAIL: return make_error_condition( address_not_available );
    case EAFNOSUPPORT: return make_error_condition( address_family_not_supported );
    case EAGAIN: return make_error_condition( resource_unavailable_try_again );
#   if EALREADY != EBUSY  //  EALREADY and EBUSY are the same on QNX Neutrino
    case EALREADY: return make_error_condition( connection_already_in_progress );
#   endif
    case EBADF: return make_error_condition( bad_file_descriptor );
    case EBADMSG: return make_error_condition( bad_message );
    case EBUSY: return make_error_condition( device_or_resource_busy );
    case ECANCELED: return make_error_condition( operation_canceled );
    case ECHILD: return make_error_condition( no_child_process );
    case ECONNABORTED: return make_error_condition( connection_aborted );
    case ECONNREFUSED: return make_error_condition( connection_refused );
    case ECONNRESET: return make_error_condition( connection_reset );
    case EDEADLK: return make_error_condition( resource_deadlock_would_occur );
    case EDESTADDRREQ: return make_error_condition( destination_address_required );
    case EDOM: return make_error_condition( argument_out_of_domain );
    case EEXIST: return make_error_condition( file_exists );
    case EFAULT: return make_error_condition( bad_address );
    case EFBIG: return make_error_condition( file_too_large );
    case EHOSTUNREACH: return make_error_condition( host_unreachable );
    case EIDRM: return make_error_condition( identifier_removed );
    case EILSEQ: return make_error_condition( illegal_byte_sequence );
    case EINPROGRESS: return make_error_condition( operation_in_progress );
    case EINTR: return make_error_condition( interrupted );
    case EINVAL: return make_error_condition( invalid_argument );
    case EIO: return make_error_condition( io_error );
    case EISCONN: return make_error_condition( already_connected );
    case EISDIR: return make_error_condition( is_a_directory );
    case ELOOP: return make_error_condition( too_many_synbolic_link_levels );
    case EMFILE: return make_error_condition( too_many_files_open );
    case EMLINK: return make_error_condition( too_many_links );
    case EMSGSIZE: return make_error_condition( message_size );
    case ENAMETOOLONG: return make_error_condition( filename_too_long );
    case ENETDOWN: return make_error_condition( network_down );
    case ENETRESET: return make_error_condition( network_reset );
    case ENETUNREACH: return make_error_condition( network_unreachable );
    case ENFILE: return make_error_condition( too_many_files_open_in_system );
    case ENOBUFS: return make_error_condition( no_buffer_space );
    case ENODATA: return make_error_condition( no_message_available );
    case ENODEV: return make_error_condition( no_such_device );
    case ENOENT: return make_error_condition( no_such_file_or_directory );
    case ENOEXEC: return make_error_condition( executable_format_error );
    case ENOLCK: return make_error_condition( no_lock_available );
    case ENOLINK: return make_error_condition( no_link );
    case ENOMEM: return make_error_condition( not_enough_memory );
    case ENOMSG: return make_error_condition( no_message );
    case ENOPROTOOPT: return make_error_condition( no_protocol_option );
    case ENOSPC: return make_error_condition( no_space_on_device );
    case ENOSR: return make_error_condition( no_stream_resources );
    case ENOSTR: return make_error_condition( not_a_stream );
    case ENOSYS: return make_error_condition( function_not_supported );