POSIX Error Codes

Error codes defined by the POSIX standard, returned via errno. Symbolic names are standardised; numeric values may differ between platforms such as Linux and macOS.

77 codes

• E2BIG Argument list too long
• EACCES Permission denied
• EADDRINUSE Address already in use
• EADDRNOTAVAIL Address not available
• EAFNOSUPPORT Address family not supported
• EAGAIN Resource temporarily unavailable
• EALREADY Connection already in progress
• EBADF Bad file descriptor
• EBADMSG Bad message
• EBUSY Device or resource busy
• ECANCELED Operation cancelled
• ECHILD No child processes
• ECONNABORTED Connection aborted
• ECONNREFUSED Connection refused
• ECONNRESET Connection reset
• EDEADLK Resource deadlock avoided
• EDESTADDRREQ Destination address required
• EDOM Mathematics argument out of domain
• EDQUOT Disk quota exceeded
• EEXIST File exists
• EFAULT Bad address
• EFBIG File too large
• EHOSTUNREACH Host unreachable
• EIDRM Identifier removed
• EILSEQ Illegal byte sequence
• EINPROGRESS Operation in progress
• EINTR Interrupted function call
• EINVAL Invalid argument
• EIO Input/output error
• EISCONN Socket is already connected
• EISDIR Is a directory
• ELOOP Too many levels of symbolic links
• EMFILE Too many open files
• EMLINK Too many links
• EMSGSIZE Message too long
• EMULTIHOP Multihop attempted
• ENAMETOOLONG Filename too long
• ENETDOWN Network is down
• ENETRESET Connection aborted by network
• ENETUNREACH Network unreachable
• ENFILE Too many open files in system
• ENOBUFS No buffer space available
• ENODEV No such device
• ENOENT No such file or directory
• ENOEXEC Executable file format error
• ENOLCK No locks available
• ENOLINK Link has been severed
• ENOMEM Not enough space
• ENOMSG No message of the desired type
• ENOPROTOOPT Protocol not available
• ENOSPC No space left on device
• ENOSYS Function not implemented
• ENOTCONN Socket is not connected
• ENOTDIR Not a directory
• ENOTEMPTY Directory not empty
• ENOTRECOVERABLE State not recoverable
• ENOTSOCK Not a socket
• ENOTSUP Operation not supported
• ENOTTY Inappropriate I/O control operation
• ENXIO No such device or address
• EOPNOTSUPP Operation not supported on socket
• EOVERFLOW Value too large to be stored in data type
• EOWNERDEAD Previous owner died
• EPERM Operation not permitted
• EPIPE Broken pipe
• EPROTO Protocol error
• EPROTONOSUPPORT Protocol not supported
• EPROTOTYPE Protocol wrong type for socket
• ERANGE Result too large
• EROFS Read-only file system
• ESPIPE Invalid seek
• ESRCH No such process
• ESTALE Stale file handle
• ETIMEDOUT Connection timed out
• ETXTBSY Text file busy
• EWOULDBLOCK Operation would block
• EXDEV Improper link