19 Diagnostics library [diagnostics]

19.4 Error numbers [errno]

19.4.1 General [errno.general]

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The contents of the header <cerrno> are the same as the POSIX header <errno.h>, except that errno shall be defined as a macro.
[Note 1: 
The intent is to remain in close alignment with the POSIX standard.
— end note]
A separate errno value is provided for each thread.

19.4.2 Header <cerrno> synopsis [cerrno.syn]

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#define errno see below #define E2BIG see below // freestanding #define EACCES see below // freestanding #define EADDRINUSE see below // freestanding #define EADDRNOTAVAIL see below // freestanding #define EAFNOSUPPORT see below // freestanding #define EAGAIN see below // freestanding #define EALREADY see below // freestanding #define EBADF see below // freestanding #define EBADMSG see below // freestanding #define EBUSY see below // freestanding #define ECANCELED see below // freestanding #define ECHILD see below // freestanding #define ECONNABORTED see below // freestanding #define ECONNREFUSED see below // freestanding #define ECONNRESET see below // freestanding #define EDEADLK see below // freestanding #define EDESTADDRREQ see below // freestanding #define EDOM see below // freestanding #define EEXIST see below // freestanding #define EFAULT see below // freestanding #define EFBIG see below // freestanding #define EHOSTUNREACH see below // freestanding #define EIDRM see below // freestanding #define EILSEQ see below // freestanding #define EINPROGRESS see below // freestanding #define EINTR see below // freestanding #define EINVAL see below // freestanding #define EIO see below // freestanding #define EISCONN see below // freestanding #define EISDIR see below // freestanding #define ELOOP see below // freestanding #define EMFILE see below // freestanding #define EMLINK see below // freestanding #define EMSGSIZE see below // freestanding #define ENAMETOOLONG see below // freestanding #define ENETDOWN see below // freestanding #define ENETRESET see below // freestanding #define ENETUNREACH see below // freestanding #define ENFILE see below // freestanding #define ENOBUFS see below // freestanding #define ENODEV see below // freestanding #define ENOENT see below // freestanding #define ENOEXEC see below // freestanding #define ENOLCK see below // freestanding #define ENOLINK see below // freestanding #define ENOMEM see below // freestanding #define ENOMSG see below // freestanding #define ENOPROTOOPT see below // freestanding #define ENOSPC see below // freestanding #define ENOSYS see below // freestanding #define ENOTCONN see below // freestanding #define ENOTDIR see below // freestanding #define ENOTEMPTY see below // freestanding #define ENOTRECOVERABLE see below // freestanding #define ENOTSOCK see below // freestanding #define ENOTSUP see below // freestanding #define ENOTTY see below // freestanding #define ENXIO see below // freestanding #define EOPNOTSUPP see below // freestanding #define EOVERFLOW see below // freestanding #define EOWNERDEAD see below // freestanding #define EPERM see below // freestanding #define EPIPE see below // freestanding #define EPROTO see below // freestanding #define EPROTONOSUPPORT see below // freestanding #define EPROTOTYPE see below // freestanding #define ERANGE see below // freestanding #define EROFS see below // freestanding #define ESPIPE see below // freestanding #define ESRCH see below // freestanding #define ETIMEDOUT see below // freestanding #define ETXTBSY see below // freestanding #define EWOULDBLOCK see below // freestanding #define EXDEV see below // freestanding
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The meaning of the macros in this header is defined by the POSIX standard.
See also: ISO/IEC 9899:2018, 7.5