This header was originally in the C standard library as <errno.h>.
This header is part of the error handling library.
| macro which expands to POSIX-compatible thread-local error number variable (macro variable) |
|
| E2BIG
(C++11) | Argument list too long (macro constant) |
| EACCES
(C++11) | Permission denied (macro constant) |
| EADDRINUSE
(C++11) | Address in use (macro constant) |
| EADDRNOTAVAIL
(C++11) | Address not available (macro constant) |
| EAFNOSUPPORT
(C++11) | Address family not supported (macro constant) |
| EAGAIN
(C++11) | Resource unavailable, try again (macro constant) |
| EALREADY
(C++11) | Connection already in progress (macro constant) |
| EBADF
(C++11) | Bad file descriptor (macro constant) |
| EBADMSG
(C++11) | Bad message (macro constant) |
| EBUSY
(C++11) | Device or resource busy (macro constant) |
| ECANCELED
(C++11) | Operation canceled (macro constant) |
| ECHILD
(C++11) | No child processes (macro constant) |
| ECONNABORTED
(C++11) | Connection aborted (macro constant) |
| ECONNREFUSED
(C++11) | Connection refused (macro constant) |
| ECONNRESET
(C++11) | Connection reset (macro constant) |
| EDEADLK
(C++11) | Resource deadlock would occur (macro constant) |
| EDESTADDRREQ
(C++11) | Destination address required (macro constant) |
| EDOM | Mathematics argument out of domain of function (macro constant) |
| EEXIST
(C++11) | File exists (macro constant) |
| EFAULT
(C++11) | Bad address (macro constant) |
| EFBIG
(C++11) | File too large (macro constant) |
| EHOSTUNREACH
(C++11) | Host is unreachable (macro constant) |
| EIDRM
(C++11) | Identifier removed (macro constant) |
| EILSEQ | Illegal byte sequence (macro constant) |
| EINPROGRESS
(C++11) | Operation in progress (macro constant) |
| EINTR
(C++11) | Interrupted function (macro constant) |
| EINVAL
(C++11) | Invalid argument (macro constant) |
| EIO
(C++11) | I/O error (macro constant) |
| EISCONN
(C++11) | Socket is connected (macro constant) |
| EISDIR
(C++11) | Is a directory (macro constant) |
| ELOOP
(C++11) | Too many levels of symbolic links (macro constant) |
| EMFILE
(C++11) | File descriptor value too large (macro constant) |
| EMLINK
(C++11) | Too many links (macro constant) |
| EMSGSIZE
(C++11) | Message too large (macro constant) |
| ENAMETOOLONG
(C++11) | Filename too long (macro constant) |
| ENETDOWN
(C++11) | Network is down (macro constant) |
| ENETRESET
(C++11) | Connection aborted by network (macro constant) |
| ENETUNREACH
(C++11) | Network unreachable (macro constant) |
| ENFILE
(C++11) | Too many files open in system (macro constant) |
| ENOBUFS
(C++11) | No buffer space available (macro constant) |
| ENODATA
(C++11) (deprecated in C++23) | No message is available on the STREAM head read queue (macro constant) |
| ENODEV
(C++11) | No such device (macro constant) |
| ENOENT
(C++11) | No such file or directory (macro constant) |
| ENOEXEC
(C++11) | Executable file format error (macro constant) |
| ENOLCK
(C++11) | No locks available (macro constant) |
| ENOLINK
(C++11) | Link has been severed (macro constant) |
| ENOMEM
(C++11) | Not enough space (macro constant) |
| ENOMSG
(C++11) | No message of the desired type (macro constant) |
| ENOPROTOOPT
(C++11) | Protocol not available (macro constant) |
| ENOSPC
(C++11) | No space left on device (macro constant) |
| ENOSR
(C++11) (deprecated in C++23) | No STREAM resources (macro constant) |
| ENOSTR
(C++11) (deprecated in C++23) | Not a STREAM (macro constant) |
| ENOSYS
(C++11) | Function not supported (macro constant) |
| ENOTCONN
(C++11) | The socket is not connected (macro constant) |
| ENOTDIR
(C++11) | Not a directory (macro constant) |
| ENOTEMPTY
(C++11) | Directory not empty (macro constant) |
| ENOTRECOVERABLE
(C++11) | State not recoverable (macro constant) |
| ENOTSOCK
(C++11) | Not a socket (macro constant) |
| ENOTSUP
(C++11) | Not supported (macro constant) |
| ENOTTY
(C++11) | Inappropriate I/O control operation (macro constant) |
| ENXIO
(C++11) | No such device or address (macro constant) |
| EOPNOTSUPP
(C++11) | Operation not supported on socket (macro constant) |
| EOVERFLOW
(C++11) | Value too large to be stored in data type (macro constant) |
| EOWNERDEAD
(C++11) | Previous owner died (macro constant) |
| EPERM
(C++11) | Operation not permitted (macro constant) |
| EPIPE
(C++11) | Broken pipe (macro constant) |
| EPROTO
(C++11) | Protocol error (macro constant) |
| EPROTONOSUPPORT
(C++11) | Protocol not supported (macro constant) |
| EPROTOTYPE
(C++11) | Protocol wrong type for socket (macro constant) |
| ERANGE | Result too large (macro constant) |
| EROFS
(C++11) | Read-only file system (macro constant) |
| ESPIPE
(C++11) | Invalid seek (macro constant) |
| ESRCH
(C++11) | No such process (macro constant) |
| ETIME
(C++11) (deprecated in C++23) | Stream ioctl() timeout (macro constant) |
| ETIMEDOUT
(C++11) | Connection timed out (macro constant) |
| ETXTBSY
(C++11) | Text file busy (macro constant) |
| EWOULDBLOCK
(C++11) | Operation would block (macro constant) |
| EXDEV
(C++11) | Cross-device link (macro constant) |
Although the header <cerrno> is based on the C standard library header <errno.h>, the majority of the macros defined by <cerrno> were adopted by C++ from the POSIX standard, rather than the C standard library.
The following behavior-changing defect reports were applied retroactively to previously published C++ standards.
| DR | Applied to | Behavior as published | Correct behavior |
|---|---|---|---|
| LWG 288 | C++98 | the macro EILSEQ was not defined in <cerrno> | defined |
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