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# std::errc

From cppreference.com
< cpp‎ | error

Defined in header `<system_error>` |  |
enum class errc; |  | (since C++11)

The scoped enumeration `std::errc` defines the values of portable error conditions that correspond to the POSIX error codes.

### [edit] Member constants

Constant | Explanation
`address_family_not_supported` | error condition corresponding to POSIX code EAFNOSUPPORT
`address_in_use` | error condition corresponding to POSIX code EADDRINUSE
`address_not_available` | error condition corresponding to POSIX code EADDRNOTAVAIL
`already_connected` | error condition corresponding to POSIX code EISCONN
`argument_list_too_long` | error condition corresponding to POSIX code E2BIG
`argument_out_of_domain` | error condition corresponding to POSIX code EDOM
`bad_address` | error condition corresponding to POSIX code EFAULT
`bad_file_descriptor` | error condition corresponding to POSIX code EBADF
`bad_message` | error condition corresponding to POSIX code EBADMSG
`broken_pipe` | error condition corresponding to POSIX code EPIPE
`connection_aborted` | error condition corresponding to POSIX code ECONNABORTED
`connection_already_in_progress` | error condition corresponding to POSIX code EALREADY
`connection_refused` | error condition corresponding to POSIX code ECONNREFUSED
`connection_reset` | error condition corresponding to POSIX code ECONNRESET
`cross_device_link` | error condition corresponding to POSIX code EXDEV
`destination_address_required` | error condition corresponding to POSIX code EDESTADDRREQ
`device_or_resource_busy` | error condition corresponding to POSIX code EBUSY
`directory_not_empty` | error condition corresponding to POSIX code ENOTEMPTY
`executable_format_error` | error condition corresponding to POSIX code ENOEXEC
`file_exists` | error condition corresponding to POSIX code EEXIST
`file_too_large` | error condition corresponding to POSIX code EFBIG
`filename_too_long` | error condition corresponding to POSIX code ENAMETOOLONG
`function_not_supported` | error condition corresponding to POSIX code ENOSYS
`host_unreachable` | error condition corresponding to POSIX code EHOSTUNREACH
`identifier_removed` | error condition corresponding to POSIX code EIDRM
`illegal_byte_sequence` | error condition corresponding to POSIX code EILSEQ
`inappropriate_io_control_operation` | error condition corresponding to POSIX code ENOTTY
`interrupted` | error condition corresponding to POSIX code EINTR
`invalid_argument` | error condition corresponding to POSIX code EINVAL
`invalid_seek` | error condition corresponding to POSIX code ESPIPE
`io_error` | error condition corresponding to POSIX code EIO
`is_a_directory` | error condition corresponding to POSIX code EISDIR
`message_size` | error condition corresponding to POSIX code EMSGSIZE
`network_down` | error condition corresponding to POSIX code ENETDOWN
`network_reset` | error condition corresponding to POSIX code ENETRESET
`network_unreachable` | error condition corresponding to POSIX code ENETUNREACH
`no_buffer_space` | error condition corresponding to POSIX code ENOBUFS
`no_child_process` | error condition corresponding to POSIX code ECHILD
`no_link` | error condition corresponding to POSIX code ENOLINK
`no_lock_available` | error condition corresponding to POSIX code ENOLCK
`no_message_available` | error condition corresponding to POSIX code ENODATA
`no_message` | error condition corresponding to POSIX code ENOMSG
`no_protocol_option` | error condition corresponding to POSIX code ENOPROTOOPT
`no_space_on_device` | error condition corresponding to POSIX code ENOSPC
`no_stream_resources` | error condition corresponding to POSIX code ENOSR
`no_such_device_or_address` | error condition corresponding to POSIX code ENXIO
`no_such_device` | error condition corresponding to POSIX code ENODEV
`no_such_file_or_directory` | error condition corresponding to POSIX code ENOENT
`no_such_process` | error condition corresponding to POSIX code ESRCH
`not_a_directory` | error condition corresponding to POSIX code ENOTDIR
`not_a_socket` | error condition corresponding to POSIX code ENOTSOCK
`not_a_stream` | error condition corresponding to POSIX code ENOSTR
`not_connected` | error condition corresponding to POSIX code ENOTCONN
`not_enough_memory` | error condition corresponding to POSIX code ENOMEM
`not_supported` | error condition corresponding to POSIX code ENOTSUP
`operation_canceled` | error condition corresponding to POSIX code ECANCELED
`operation_in_progress` | error condition corresponding to POSIX code EINPROGRESS
`operation_not_permitted` | error condition corresponding to POSIX code EPERM
`operation_not_supported` | error condition corresponding to POSIX code EOPNOTSUPP
`operation_would_block` | error condition corresponding to POSIX code EWOULDBLOCK
`owner_dead` | error condition corresponding to POSIX code EOWNERDEAD
`permission_denied` | error condition corresponding to POSIX code EACCES
`protocol_error` | error condition corresponding to POSIX code EPROTO
`protocol_not_supported` | error condition corresponding to POSIX code EPROTONOSUPPORT
`read_only_file_system` | error condition corresponding to POSIX code EROFS
`resource_deadlock_would_occur` | error condition corresponding to POSIX code EDEADLK
`resource_unavailable_try_again` | error condition corresponding to POSIX code EAGAIN
`result_out_of_range` | error condition corresponding to POSIX code ERANGE
`state_not_recoverable` | error condition corresponding to POSIX code ENOTRECOVERABLE
`stream_timeout` | error condition corresponding to POSIX code ETIME
`text_file_busy` | error condition corresponding to POSIX code ETXTBSY
`timed_out` | error condition corresponding to POSIX code ETIMEDOUT
`too_many_files_open_in_system` | error condition corresponding to POSIX code ENFILE
`too_many_files_open` | error condition corresponding to POSIX code EMFILE
`too_many_links` | error condition corresponding to POSIX code EMLINK
`too_many_symbolic_link_levels` | error condition corresponding to POSIX code ELOOP
`value_too_large` | error condition corresponding to POSIX code EOVERFLOW
`wrong_protocol_type` | error condition corresponding to POSIX code EPROTOTYPE

### [edit] Non-member functions

make_error_code(std::errc) (C++11) | constructs an std::errc error code (function) [edit]
make_error_condition(std::errc) (C++11) | constructs an std::errc error condition (function) [edit]

### [edit] Helper classes

is_error_condition_enum<std::errc> (C++11) | extends the type trait std::is_error_condition_enum to identify the the std::errc values as error conditions (function template) [edit]

### [edit] Example

Run this code

    #include <iostream>
    #include <system_error>
    #include <thread>
    int main()
    {
        try {
            std::thread().detach(); // detaching a not-a-thread
        } catch (const std::system_error& e) {
            std::cout << "Caught a system_error\n";
            if(e.code() == std::errc::invalid_argument)
                std::cout << "The error condition is std::errc::invalid_argument\n";
            std::cout << "the error description is " << e.what() << '\n';
        }
    }

Output:

    Caught a system_error
    The error condition is std::errc::invalid_argument
    the error description is Invalid argument

### [edit] See also

error_code (C++11) | holds a platform-dependent error code (class) [edit]
error_condition (C++11) | holds a portable error code (class) [edit]

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