libs/system/src/error_code.cpp
// 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::errc; #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))\ || (defined(__QNXNTO__)) 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_symbolic_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 ); case ENOTCONN: return make_error_condition( not_connected ); case ENOTDIR: return make_error_condition( not_a_directory ); # if ENOTEMPTY != EEXIST // AIX treats ENOTEMPTY and EEXIST as the same value case ENOTEMPTY: return make_error_condition( directory_not_empty ); # endif // ENOTEMPTY != EEXIST case ENOTRECOVERABLE: return make_error_condition( state_not_recoverable ); case ENOTSOCK: return make_error_condition( not_a_socket ); case ENOTSUP: return make_error_condition( not_supported ); case ENOTTY: return make_error_condition( inappropriate_io_control_operation ); case ENXIO: return make_error_condition( no_such_device_or_address ); # if EOPNOTSUPP != ENOTSUP case EOPNOTSUPP: return make_error_condition( operation_not_supported ); # endif // EOPNOTSUPP != ENOTSUP case EOVERFLOW: return make_error_condition( value_too_large ); case EOWNERDEAD: return make_error_condition( owner_dead ); case EPERM: return make_error_condition( operation_not_permitted ); case EPIPE: return make_error_condition( broken_pipe ); case EPROTO: return make_error_condition( protocol_error ); case EPROTONOSUPPORT: return make_error_condition( protocol_not_supported ); case EPROTOTYPE: return make_error_condition( wrong_protocol_type ); case ERANGE: return make_error_condition( result_out_of_range ); case EROFS: return make_error_condition( read_only_file_system ); case ESPIPE: return make_error_condition( invalid_seek ); case ESRCH: return make_error_condition( no_such_process ); case ETIME: return make_error_condition( stream_timeout ); case ETIMEDOUT: return make_error_condition( timed_out ); case ETXTBSY: return make_error_condition( text_file_busy ); # if EAGAIN != EWOULDBLOCK case EWOULDBLOCK: return make_error_condition( operation_would_block ); # endif // EAGAIN != EWOULDBLOCK case EXDEV: return make_error_condition( cross_device_link ); #else // Windows system -> posix_errno decode table ---------------------------// // see WinError.h comments for descriptions of errors case ERROR_ACCESS_DENIED: return make_error_condition( permission_denied ); case ERROR_ALREADY_EXISTS: return make_error_condition( file_exists ); case ERROR_BAD_UNIT: return make_error_condition( no_such_device ); case ERROR_BUFFER_OVERFLOW: return make_error_condition( filename_too_long ); case ERROR_BUSY: return make_error_condition( device_or_resource_busy ); case ERROR_BUSY_DRIVE: return make_error_condition( device_or_resource_busy ); case ERROR_CANNOT_MAKE: return make_error_condition( permission_denied ); case ERROR_CANTOPEN: return make_error_condition( io_error ); case ERROR_CANTREAD: return make_error_condition( io_error ); case ERROR_CANTWRITE: return make_error_condition( io_error ); case ERROR_CURRENT_DIRECTORY: return make_error_condition( permission_denied ); case ERROR_DEV_NOT_EXIST: return make_error_condition( no_such_device ); case ERROR_DEVICE_IN_USE: return make_error_condition( device_or_resource_busy ); case ERROR_DIR_NOT_EMPTY: return make_error_condition( directory_not_empty ); case ERROR_DIRECTORY: return make_error_condition( invalid_argument ); // WinError.h: "The directory name is invalid" case ERROR_DISK_FULL: return make_error_condition( no_space_on_device ); case ERROR_FILE_EXISTS: return make_error_condition( file_exists ); case ERROR_FILE_NOT_FOUND: return make_error_condition( no_such_file_or_directory ); case ERROR_HANDLE_DISK_FULL: return make_error_condition( no_space_on_device ); case ERROR_INVALID_ACCESS: return make_error_condition( permission_denied ); case ERROR_INVALID_DRIVE: return make_error_condition( no_such_device ); case ERROR_INVALID_FUNCTION: return make_error_condition( function_not_supported ); case ERROR_INVALID_HANDLE: return make_error_condition( invalid_argument ); case ERROR_INVALID_NAME: return make_error_condition( invalid_argument ); case ERROR_LOCK_VIOLATION: return make_error_condition( no_lock_available ); case ERROR_LOCKED: return make_error_condition( no_lock_available ); case ERROR_NEGATIVE_SEEK: return make_error_condition( invalid_argument ); case ERROR_NOACCESS: return make_error_condition( permission_denied ); case ERROR_NOT_ENOUGH_MEMORY: return make_error_condition( not_enough_memory ); case ERROR_NOT_READY: return make_error_condition( resource_unavailable_try_again ); case ERROR_NOT_SAME_DEVICE: return make_error_condition( cross_device_link ); case ERROR_OPEN_FAILED: return make_error_condition( io_error ); case ERROR_OPEN_FILES: return make_error_condition( device_or_resource_busy ); case ERROR_OPERATION_ABORTED: return make_error_condition( operation_canceled ); case ERROR_OUTOFMEMORY: return make_error_condition( not_enough_memory ); case ERROR_PATH_NOT_FOUND: return make_error_condition( no_such_file_or_directory ); case ERROR_READ_FAULT: return make_error_condition( io_error ); case ERROR_RETRY: return make_error_condition( resource_unavailable_try_again ); case ERROR_SEEK: return make_error_condition( io_error ); case ERROR_SHARING_VIOLATION: return make_error_condition( permission_denied ); case ERROR_TOO_MANY_OPEN_FILES: return make_error_condition( too_many_files_open ); case ERROR_WRITE_FAULT: return make_error_condition( io_error ); case ERROR_WRITE_PROTECT: return make_error_condition( permission_denied ); case WSAEACCES: return make_error_condition( permission_denied ); case WSAEADDRINUSE: return make_error_condition( address_in_use ); case WSAEADDRNOTAVAIL: return make_error_condition( address_not_available ); case WSAEAFNOSUPPORT: return make_error_condition( address_family_not_supported ); case WSAEALREADY: return make_error_condition( connection_already_in_progress ); case WSAEBADF: return make_error_condition( bad_file_descriptor ); case WSAECONNABORTED: return make_error_condition( connection_aborted ); case WSAECONNREFUSED: return make_error_condition( connection_refused ); case WSAECONNRESET: return make_error_condition( connection_reset ); case WSAEDESTADDRREQ: return make_error_condition( destination_address_required ); case WSAEFAULT: return make_error_condition( bad_address ); case WSAEHOSTUNREACH: return make_error_condition( host_unreachable ); case WSAEINPROGRESS: return make_error_condition( operation_in_progress ); case WSAEINTR: return make_error_condition( interrupted ); case WSAEINVAL: return make_error_condition( invalid_argument ); case WSAEISCONN: return make_error_condition( already_connected ); case WSAEMFILE: return make_error_condition( too_many_files_open ); case WSAEMSGSIZE: return make_error_condition( message_size ); case WSAENAMETOOLONG: return make_error_condition( filename_too_long ); case WSAENETDOWN: return make_error_condition( network_down ); case WSAENETRESET: return make_error_condition( network_reset ); case WSAENETUNREACH: return make_error_condition( network_unreachable ); case WSAENOBUFS: return make_error_condition( no_buffer_space ); case WSAENOPROTOOPT: return make_error_condition( no_protocol_option ); case WSAENOTCONN: return make_error_condition( not_connected ); case WSAENOTSOCK: return make_error_condition( not_a_socket ); case WSAEOPNOTSUPP: return make_error_condition( operation_not_supported ); case WSAEPROTONOSUPPORT: return make_error_condition( protocol_not_supported ); case WSAEPROTOTYPE: return make_error_condition( wrong_protocol_type ); case WSAETIMEDOUT: return make_error_condition( timed_out ); case WSAEWOULDBLOCK: return make_error_condition( operation_would_block ); #endif default: return error_condition( ev, system_category ); } } # if !defined( BOOST_WINDOWS_API ) std::string system_error_category::message( int ev ) const { return generic_category.message( ev ); } # else // TODO: //Some quick notes on the implementation (sorry for the noise if //someone has already mentioned them): // //- The ::LocalFree() usage isn't exception safe. // //See: // //<http://boost.cvs.sourceforge.net/boost/boost/boost/asio/system_exception.hpp?revision=1.1&view=markup> // //in the implementation of what() for an example. // //Cheers, //Chris std::string system_error_category::message( int ev ) const { # ifndef BOOST_NO_ANSI_APIS LPVOID lpMsgBuf; DWORD retval = ::FormatMessageA( FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS, NULL, ev, MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), // Default language (LPSTR) &lpMsgBuf, 0, NULL ); if (retval == 0) return std::string("Unknown error"); std::string str( static_cast<LPCSTR>(lpMsgBuf) ); ::LocalFree( lpMsgBuf ); // free the buffer # else // WinCE workaround LPVOID lpMsgBuf; DWORD retval = ::FormatMessageW( FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS, NULL, ev, MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), // Default language (LPWSTR) &lpMsgBuf, 0, NULL ); if (retval == 0) return std::string("Unknown error"); int num_chars = (wcslen( static_cast<LPCWSTR>(lpMsgBuf) ) + 1) * 2; LPSTR narrow_buffer = (LPSTR)_alloca( num_chars ); if (::WideCharToMultiByte(CP_ACP, 0, static_cast<LPCWSTR>(lpMsgBuf), -1, narrow_buffer, num_chars, NULL, NULL) == 0) return std::string("Unknown error"); std::string str( narrow_buffer ); ::LocalFree( lpMsgBuf ); // free the buffer # endif while ( str.size() && (str[str.size()-1] == '\n' || str[str.size()-1] == '\r') ) str.erase( str.size()-1 ); if ( str.size() && str[str.size()-1] == '.' ) { str.erase( str.size()-1 ); } return str; } # endif } // unnamed namespace namespace boost { namespace system { # ifndef BOOST_SYSTEM_NO_DEPRECATED BOOST_SYSTEM_DECL error_code throws; // "throw on error" special error_code; // note that it doesn't matter if this // isn't initialized before use since // the only use is to take its // address for comparison purposes # endif BOOST_SYSTEM_DECL const error_category & get_system_category() { static const system_error_category system_category_const; return system_category_const; } BOOST_SYSTEM_DECL const error_category & get_generic_category() { static const generic_error_category generic_category_const; return generic_category_const; } } // namespace system } // namespace boost