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9.9 errno.h

POSIX specification:
https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/errno.h.html

Gnulib module: errno

Portability problems fixed by Gnulib:

• The macro EOVERFLOW is not defined on some platforms: OpenBSD 4.0, mingw, MSVC 9.
• The macro ENOLINK is not defined on some platforms: OpenBSD 6.7, mingw, MSVC 9.
• The macro EMULTIHOP is not defined on some platforms: OpenBSD 6.7, mingw, MSVC 14.
• The macro ECANCELED is not defined on some platforms: OpenBSD 4.0, Cygwin, mingw, MSVC 9.
• The macros ENOMSG, EIDRM, EPROTO, EBADMSG, ENOTSUP are not defined on some platforms: OpenBSD 4.0, mingw, MSVC 9.
• The macro ESTALE is not defined on some platforms: mingw, MSVC 14.
• The macro EDQUOT is not defined on some platforms: NonStop Kernel, mingw, MSVC 14.
• The macros ENETRESET, ECONNABORTED are not defined on some platforms: Minix 3.1.8, mingw, MSVC 9.
• The macros EWOULDBLOCK, ETXTBSY, ELOOP, ENOTSOCK, EDESTADDRREQ, EMSGSIZE, EPROTOTYPE, ENOPROTOOPT, EPROTONOSUPPORT, EOPNOTSUPP, EAFNOSUPPORT, EADDRINUSE, EADDRNOTAVAIL, ENETDOWN, ENETUNREACH, ECONNRESET, ENOBUFS, EISCONN, ENOTCONN, ETIMEDOUT, ECONNREFUSED, EHOSTUNREACH, EALREADY, EINPROGRESS are not defined on some platforms: mingw, MSVC 9.
• The macros EOWNERDEAD, ENOTRECOVERABLE are not defined on some platforms: glibc/Linux 2.3.6, glibc/Hurd 2.15, glibc/kFreeBSD 2.15, Mac OS X 10.5, FreeBSD 6.0, NetBSD 9.3, OpenBSD 6.0, Minix 3.1.8, AIX 5.1, HP-UX 11, Cygwin, mingw without pthreads-win32, MSVC 9.
• The macro EILSEQ is not defined on some platforms: LynxOS 178 2.2.2.

Portability problems not fixed by Gnulib: