errno — Standard errno system symbols

This module makes available standard errno system symbols. The value of each symbol is the corresponding integer value. The names and descriptions are borrowed from linux/include/errno.h, which should be all-inclusive.

errno.errorcode

Dictionary providing a mapping from the errno value to the string name in the underlying system. For instance, errno.errorcode[errno.EPERM] maps to 'EPERM'.

To translate a numeric error code to an error message, use os.strerror().

Of the following list, symbols that are not used on the current platform are not defined by the module. The specific list of defined symbols is available as errno.errorcode.keys(). Symbols available can include:

errno.EPERM

Operation not permitted. This error is mapped to the exception PermissionError.

errno.ENOENT

No such file or directory. This error is mapped to the exception FileNotFoundError.

errno.ESRCH

No such process. This error is mapped to the exception ProcessLookupError.

errno.EINTR

Interrupted system call. This error is mapped to the exception InterruptedError.

errno.EIO

I/O error

errno.ENXIO

No such device or address

errno.E2BIG

Arg list too long

errno.ENOEXEC

Exec format error

errno.EBADF

Bad file number

errno.ECHILD

No child processes. This error is mapped to the exception ChildProcessError.

errno.EAGAIN

Try again. This error is mapped to the exception BlockingIOError.

errno.ENOMEM

Out of memory

errno.EACCES

Permission denied. This error is mapped to the exception PermissionError.

errno.EFAULT

Bad address

errno.ENOTBLK

Block device required

errno.EBUSY

Device or resource busy

errno.EEXIST

File exists. This error is mapped to the exception FileExistsError.

errno.EXDEV

Cross-device link

errno.ENODEV

No such device

errno.ENOTDIR

Not a directory. This error is mapped to the exception NotADirectoryError.

errno.EISDIR

Is a directory. This error is mapped to the exception IsADirectoryError.

errno.EINVAL

Invalid argument

errno.ENFILE

File table overflow

errno.EMFILE

Too many open files

errno.ENOTTY

Not a typewriter

errno.ETXTBSY

Text file busy

errno.EFBIG

File too large

errno.ENOSPC

No space left on device

errno.ESPIPE

Illegal seek

errno.EROFS

Read-only file system

Too many links

errno.EPIPE

Broken pipe. This error is mapped to the exception BrokenPipeError.

errno.EDOM

Math argument out of domain of func

errno.ERANGE

Math result not representable

errno.EDEADLK

Resource deadlock would occur

errno.ENAMETOOLONG

File name too long

errno.ENOLCK

No record locks available

errno.ENOSYS

Function not implemented

errno.ENOTEMPTY

Directory not empty

errno.ELOOP

Too many symbolic links encountered

errno.EWOULDBLOCK

Operation would block. This error is mapped to the exception BlockingIOError.

errno.ENOMSG

No message of desired type

errno.EIDRM

Identifier removed

errno.ECHRNG

Channel number out of range

errno.EL2NSYNC

Level 2 not synchronized

errno.EL3HLT

Level 3 halted

errno.EL3RST

Level 3 reset

errno.ELNRNG

Link number out of range

errno.EUNATCH

Protocol driver not attached

errno.ENOCSI

No CSI structure available

errno.EL2HLT

Level 2 halted

errno.EBADE

Invalid exchange

errno.EBADR

Invalid request descriptor

errno.EXFULL

Exchange full

errno.ENOANO

No anode

errno.EBADRQC

Invalid request code

errno.EBADSLT

Invalid slot

errno.EDEADLOCK

File locking deadlock error

errno.EBFONT

Bad font file format

errno.ENOSTR

Device not a stream

errno.ENODATA

No data available

errno.ETIME

Timer expired

errno.ENOSR

Out of streams resources

errno.ENONET

Machine is not on the network

errno.ENOPKG

Package not installed

errno.EREMOTE

Object is remote

Link has been severed

errno.EADV

Advertise error

errno.ESRMNT

Srmount error

errno.ECOMM

Communication error on send

errno.EPROTO

Protocol error

errno.EMULTIHOP

Multihop attempted

errno.EDOTDOT

RFS specific error

errno.EBADMSG

Not a data message

errno.EOVERFLOW

Value too large for defined data type

errno.ENOTUNIQ

Name not unique on network

errno.EBADFD

File descriptor in bad state

errno.EREMCHG

Remote address changed

errno.ELIBACC

Can not access a needed shared library

errno.ELIBBAD

Accessing a corrupted shared library

errno.ELIBSCN

.lib section in a.out corrupted

errno.ELIBMAX

Attempting to link in too many shared libraries

errno.ELIBEXEC

Cannot exec a shared library directly

errno.EILSEQ

Illegal byte sequence

errno.ERESTART

Interrupted system call should be restarted

errno.ESTRPIPE

Streams pipe error

errno.EUSERS

Too many users

errno.ENOTSOCK

Socket operation on non-socket

errno.EDESTADDRREQ

Destination address required

errno.EMSGSIZE

Message too long

errno.EPROTOTYPE

Protocol wrong type for socket

errno.ENOPROTOOPT

Protocol not available

errno.EPROTONOSUPPORT

Protocol not supported

errno.ESOCKTNOSUPPORT

Socket type not supported

errno.EOPNOTSUPP

Operation not supported on transport endpoint

errno.ENOTSUP

Operation not supported

Added in version 3.2.

errno.EPFNOSUPPORT

Protocol family not supported

errno.EAFNOSUPPORT

Address family not supported by protocol

errno.EADDRINUSE

Address already in use

errno.EADDRNOTAVAIL

Cannot assign requested address

errno.ENETDOWN

Network is down

errno.ENETUNREACH

Network is unreachable

errno.ENETRESET

Network dropped connection because of reset

errno.ECONNABORTED

Software caused connection abort. This error is mapped to the exception ConnectionAbortedError.

errno.ECONNRESET

Connection reset by peer. This error is mapped to the exception ConnectionResetError.

errno.ENOBUFS

No buffer space available

errno.EISCONN

Transport endpoint is already connected

errno.ENOTCONN

Transport endpoint is not connected

errno.ESHUTDOWN

Cannot send after transport endpoint shutdown. This error is mapped to the exception BrokenPipeError.

errno.ETOOMANYREFS

Too many references: cannot splice

errno.ETIMEDOUT

Connection timed out. This error is mapped to the exception TimeoutError.

errno.ECONNREFUSED

Connection refused. This error is mapped to the exception ConnectionRefusedError.

errno.EHOSTDOWN

Host is down

errno.EHOSTUNREACH

No route to host

errno.EHWPOISON

Memory page has hardware error.

Added in version 3.14.

errno.EALREADY

Operation already in progress. This error is mapped to the exception BlockingIOError.

errno.EINPROGRESS

Operation now in progress. This error is mapped to the exception BlockingIOError.

errno.ESTALE

Stale NFS file handle

errno.EUCLEAN

Structure needs cleaning

errno.ENOTNAM

Not a XENIX named type file

errno.ENAVAIL

No XENIX semaphores available

errno.EISNAM

Is a named type file

errno.EREMOTEIO

Remote I/O error

errno.EDQUOT

Quota exceeded

errno.EQFULL

Interface output queue is full

Added in version 3.11.

errno.ENOTCAPABLE

Capabilities insufficient. This error is mapped to the exception PermissionError.

Availability: WASI, FreeBSD

Added in version 3.11.1.

errno.ECANCELED

Operation canceled

Added in version 3.2.

errno.EOWNERDEAD

Owner died

Added in version 3.2.

errno.ENOTRECOVERABLE

State not recoverable

Added in version 3.2.