Portability problems fixed by Gnulib:
@itemize
@item
+Some platforms mistakenly succeed on @code{readlink("link/",buf,len)}:
+FreeBSD 7.2, Solaris 9.
+@item
On some platforms, @code{readlink} returns @code{int} instead of
@code{ssize_t}:
FreeBSD 6.0, OpenBSD 3.8, Cygwin 1.5.x.
When @code{readlink} is called on a file that is not a symbolic link:
Irix may set @code{errno} to @code{ENXIO} instead of @code{EINVAL}. Cygwin
may set errno to @code{EACCES} instead of @code{EINVAL}.
+@item
+Symlink contents do not always have a trailing null byte, and there is
+no indication if symlink contents were truncated if the return value
+matches the length. Furthermore, AIX 5.1 and HP-UX 11 set
+@code{errno} to @code{ERANGE} rather than returning truncated
+contents, and Linux sets @code{errno} to @code{EINVAL} if the
+requested length is zero. Use the gnulib module areadlink for
+improved ability to read symlink contents.
@end itemize