@node errno.h
@section @file{errno.h}

POSIX specification:@* @url{https://pubs.opengroup.org/onlinepubs/9799919799/basedefs/errno.h.html}

Gnulib module: errno-h
@mindex errno-h

Portability problems fixed by Gnulib:
@itemize
@item
The macro @code{EOVERFLOW} is not defined
on some platforms:
OpenBSD 4.0, mingw, MSVC 9.
@item
The macro @code{ENOLINK} is not defined
on some platforms:
OpenBSD 7.5, mingw, MSVC 9.
@item
The macro @code{EMULTIHOP} is not defined
on some platforms:
OpenBSD 7.5, mingw, MSVC 14.
@item
The macro @code{ECANCELED} is not defined on some platforms:
OpenBSD 4.0, Cygwin, mingw, MSVC 9.
@item
The macros @code{ENOMSG}, @code{EIDRM}, @code{EPROTO}, @code{EBADMSG},
@code{ENOTSUP} are not defined on some platforms:
OpenBSD 4.0, mingw, MSVC 9.
@item
The macro @code{ESTALE} is not defined on some platforms:
mingw, MSVC 14.
@item
The macro @code{EDQUOT} is not defined on some platforms:
NonStop Kernel, mingw, MSVC 14.
@item
The macros @code{ENETRESET}, @code{ECONNABORTED} are not defined on some
platforms:
Minix 3.1.8, mingw, MSVC 9.
@item
The macros @code{EWOULDBLOCK}, @code{ETXTBSY}, @code{ELOOP}, @code{ENOTSOCK},
@code{EDESTADDRREQ}, @code{EMSGSIZE}, @code{EPROTOTYPE}, @code{ENOPROTOOPT},
@code{EPROTONOSUPPORT}, @code{EOPNOTSUPP}, @code{EAFNOSUPPORT},
@code{EADDRINUSE}, @code{EADDRNOTAVAIL}, @code{ENETDOWN}, @code{ENETUNREACH},
@code{ECONNRESET}, @code{ENOBUFS}, @code{EISCONN}, @code{ENOTCONN},
@code{ETIMEDOUT}, @code{ECONNREFUSED}, @code{EHOSTUNREACH}, @code{EALREADY},
@code{EINPROGRESS} are not defined on some platforms:
mingw, MSVC 9.
@item
The macros @code{EOWNERDEAD}, @code{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.
@item
The macro @code{ESOCKTNOSUPPORT} is not defined on some platforms:
Haiku.
@item
The macro @code{EILSEQ} is not defined on some platforms:
LynxOS 178 2.2.2.
@item
The macros @code{EEXIST} and @code{ENOTEMPTY} have the same value on
some platforms:
AIX 7.3.
@end itemize

Portability problems not fixed by Gnulib:
@itemize
@item
All error numbers are negative on some platforms:
Haiku.
@end itemize
