C++ - <cerrno> (errno.h)
The C++ <cerrno> header defines macro variable errno plus at least three additional macro constants: EDOM, ERANGE and EILSEQ. Along with this, the majority of the macros defined by this header file were adopted by C++11 available in POSIX environments.
These macros are available to use in a current program after including the header file using - #include <cerrno> or #include <errno.h>. All macros of this header file are listed below:
Library Macros
Macro variables
| Macro | Description |
|---|---|
| errno | macro which expands to POSIX-compatible thread-local error number variable. |
Macro constants
| Macros | Description |
|---|---|
| E2BIG (C++11) | Argument list too long |
| EACCES (C++11) | Permission denied |
| EADDRINUSE (C++11) | Address in use |
| EADDRNOTAVAIL (C++11) | Address not available |
| EAFNOSUPPORT (C++11) | Address family not supported |
| EAGAIN (C++11) | Resource unavailable, try again |
| EALREADY (C++11) | Connection already in progress |
| EBADF (C++11) | Bad file descriptor |
| EBADMSG (C++11) | Bad message |
| EBUSY (C++11) | Device or resource busy |
| ECANCELED (C++11) | Operation canceled |
| ECHILD (C++11) | No child processes |
| ECONNABORTED (C++11) | Connection aborted |
| ECONNREFUSED (C++11) | Connection refused |
| ECONNRESET (C++11) | Connection reset |
| EDEADLK (C++11) | Resource deadlock would occur |
| EDESTADDRREQ (C++11) | Destination address required |
| EDOM | Mathematics argument out of domain of function |
| EEXIST (C++11) | File exists |
| EFAULT (C++11) | Bad address |
| EFBIG (C++11) | File too large |
| EHOSTUNREACH (C++11) | Host is unreachable |
| EIDRM (C++11) | Identifier removed |
| EILSEQ (C++11) | Illegal byte sequence |
| EINPROGRESS (C++11) | Operation in progress |
| EINTR (C++11) | Interrupted function |
| EINVAL (C++11) | Invalid argument |
| EIO (C++11) | I/O error |
| EISCONN (C++11) | Socket is connected |
| EISDIR (C++11) | Is a directory |
| ELOOP (C++11) | Too many levels of symbolic links |
| EMFILE (C++11) | File descriptor value too large |
| EMLINK (C++11) | Too many links |
| EMSGSIZE (C++11) | Message too large |
| ENAMETOOLONG (C++11) | Filename too long |
| ENETDOWN (C++11) | Network is down |
| ENETRESET (C++11) | Connection aborted by network |
| ENETUNREACH (C++11) | Network unreachable |
| ENFILE (C++11) | Too many files open in system |
| ENOBUFS (C++11) | No buffer space available |
| ENODATA (C++11) | No message is available on the STREAM head read queue |
| ENODEV (C++11) | No such device |
| ENOENT (C++11) | No such file or directory |
| ENOEXEC (C++11) | Executable file format error |
| ENOLCK (C++11) | No locks available |
| ENOLINK (C++11) | Link has been severed |
| ENOMEM (C++11) | Not enough space |
| ENOMSG (C++11) | No message of the desired type |
| ENOPROTOOPT (C++11) | Protocol not available |
| ENOSPC (C++11) | No space left on device |
| ENOSR (C++11) | No STREAM resources |
| ENOSTR (C++11) | Not a STREAM |
| ENOSYS (C++11) | Function not supported |
| ENOTCONN (C++11) | The socket is not connected |
| ENOTDIR (C++11) | Not a directory |
| ENOTEMPTY (C++11) | Directory not empty |
| ENOTRECOVERABLE (C++11) | State not recoverable |
| ENOTSOCK (C++11) | Not a socket |
| ENOTSUP (C++11) | Not supported |
| ENOTTY (C++11) | Inappropriate I/O control operation |
| ENXIO (C++11) | No such device or address |
| EOPNOTSUPP (C++11) | Operation not supported on socket |
| EOVERFLOW (C++11) | Value too large to be stored in data type |
| EOWNERDEAD (C++11) | Previous owner died |
| EPERM (C++11) | Operation not permitted |
| EPIPE (C++11) | Broken pipe |
| EPROTO (C++11) | Protocol error |
| EPROTONOSUPPORT (C++11) | Protocol not supported |
| EPROTOTYPE (C++11) | Protocol wrong type for socket |
| ERANGE | Result too large |
| EROFS (C++11) | Read-only file system |
| ESPIPE (C++11) | Invalid seek |
| ESRCH (C++11) | No such process |
| ETIME (C++11) | Stream ioctl() timeout |
| ETIMEDOUT (C++11) | Connection timed out |
| ETXTBSY (C++11) | Text file busy |
| EWOULDBLOCK (C++11) | Operation would block |
| EXDEV (C++11) | Cross-device link |
Note: 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.
