select: Document a Haiku bug

[Bruno Haible]

Another Haiku bug, found while porting GNU clisp:


2024-11-01  Bruno Haible  <bruno@clisp.org>

        select: Document a Haiku bug.
        * doc/posix-functions/select.texi: Mention a Haiku bug.

diff --git a/doc/posix-functions/select.texi b/doc/posix-functions/select.texi
index 148c4af3ce..6827a3acc7 100644
--- a/doc/posix-functions/select.texi
+++ b/doc/posix-functions/select.texi
@@ -42,4 +42,9 @@
 @item
 On Linux, when some file descriptor refers to a regular file, @code{select}
 may fail, setting @code{errno} to @code{EBADF}.
+@item
+On Haiku,
+@c https://dev.haiku-os.org/ticket/19220
+the maximum allowed value for the first argument is not @code{FD_SETSIZE}
+but @code{FD_SETSIZE / 2}.
 @end itemize