+Under Windows, when passing a pipe, Gnulib's @code{select} replacement might
+return 0 even before the timeout has passed. Programs using it with pipes can
+thus busy wait.
+@item
+On Solaris 2.6 and older, @code{select} applied to a file descriptor opened
+for reading and associated with @code{/dev/null} hangs, waiting for input,
+when instead it should return immediately.
+@item