This header was originally in the C standard library as<errno.h>.
This header is part of theerror handling library.
Contents |
| macro which expands to POSIX-compatible thread-local error number variable (macro variable)[edit] | |
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) | Streamioctl() 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.
#define errno /* see description */#define E2BIG /* see description */ // freestanding#define EACCES /* see description */ // freestanding#define EADDRINUSE /* see description */ // freestanding#define EADDRNOTAVAIL /* see description */ // freestanding#define EAFNOSUPPORT /* see description */ // freestanding#define EAGAIN /* see description */ // freestanding#define EALREADY /* see description */ // freestanding#define EBADF /* see description */ // freestanding#define EBADMSG /* see description */ // freestanding#define EBUSY /* see description */ // freestanding#define ECANCELED /* see description */ // freestanding#define ECHILD /* see description */ // freestanding#define ECONNABORTED /* see description */ // freestanding#define ECONNREFUSED /* see description */ // freestanding#define ECONNRESET /* see description */ // freestanding#define EDEADLK /* see description */ // freestanding#define EDESTADDRREQ /* see description */ // freestanding#define EDOM /* see description */ // freestanding#define EEXIST /* see description */ // freestanding#define EFAULT /* see description */ // freestanding#define EFBIG /* see description */ // freestanding#define EHOSTUNREACH /* see description */ // freestanding#define EIDRM /* see description */ // freestanding#define EILSEQ /* see description */ // freestanding#define EINPROGRESS /* see description */ // freestanding#define EINTR /* see description */ // freestanding#define EINVAL /* see description */ // freestanding#define EIO /* see description */ // freestanding#define EISCONN /* see description */ // freestanding#define EISDIR /* see description */ // freestanding#define ELOOP /* see description */ // freestanding#define EMFILE /* see description */ // freestanding#define EMLINK /* see description */ // freestanding#define EMSGSIZE /* see description */ // freestanding#define ENAMETOOLONG /* see description */ // freestanding#define ENETDOWN /* see description */ // freestanding#define ENETRESET /* see description */ // freestanding#define ENETUNREACH /* see description */ // freestanding#define ENFILE /* see description */ // freestanding#define ENOBUFS /* see description */ // freestanding#define ENODEV /* see description */ // freestanding#define ENOENT /* see description */ // freestanding#define ENOEXEC /* see description */ // freestanding#define ENOLCK /* see description */ // freestanding#define ENOLINK /* see description */ // freestanding#define ENOMEM /* see description */ // freestanding#define ENOMSG /* see description */ // freestanding#define ENOPROTOOPT /* see description */ // freestanding#define ENOSPC /* see description */ // freestanding#define ENOSYS /* see description */ // freestanding#define ENOTCONN /* see description */ // freestanding#define ENOTDIR /* see description */ // freestanding#define ENOTEMPTY /* see description */ // freestanding#define ENOTRECOVERABLE /* see description */ // freestanding#define ENOTSOCK /* see description */ // freestanding#define ENOTSUP /* see description */ // freestanding#define ENOTTY /* see description */ // freestanding#define ENXIO /* see description */ // freestanding#define EOPNOTSUPP /* see description */ // freestanding#define EOVERFLOW /* see description */ // freestanding#define EOWNERDEAD /* see description */ // freestanding#define EPERM /* see description */ // freestanding#define EPIPE /* see description */ // freestanding#define EPROTO /* see description */ // freestanding#define EPROTONOSUPPORT /* see description */ // freestanding#define EPROTOTYPE /* see description */ // freestanding#define ERANGE /* see description */ // freestanding#define EROFS /* see description */ // freestanding#define ESPIPE /* see description */ // freestanding#define ESRCH /* see description */ // freestanding#define ETIMEDOUT /* see description */ // freestanding#define ETXTBSY /* see description */ // freestanding#define EWOULDBLOCK /* see description */ // freestanding#define EXDEV /* see description */ // freestanding
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 macroEILSEQ was not defined in<cerrno> | defined |
