+@item
+This function does not reject trailing slashes on non-directories on
+some platforms, as in @code{renameat(fd,"file",fd,"new/")}:
+Solaris 10.
+@item
+This function ignores trailing slashes on symlinks on some platforms,
+such that @code{renameat(fd,"link/",fd,"new")} corrupts @file{link}:
+Solaris 9.
+@item
+This function is missing on some platforms:
+glibc 2.3.6, MacOS X 10.3, FreeBSD 6.0, NetBSD 3.0, OpenBSD 3.8, AIX
+5.1, HP-UX 11, IRIX 6.5, OSF/1 5.1, Solaris 8, Cygwin 1.5.x, mingw,
+Interix 3.5, BeOS.
+But the replacement function is not safe to be used in libraries and is not multithread-safe.