@itemize
@item
This function is missing on some platforms:
-MacOS X 10.5, OpenBSD 3.8, Minix 3.1.8, Solaris 2.4, Cygwin, mingw, Interix 3.5, BeOS.
+MacOS X 10.5, OpenBSD 3.8, Minix 3.1.8, Solaris 2.4, Cygwin, mingw, MSVC 9, Interix 3.5, BeOS.
@item
Linux implements the meaning of NULL timeout by doing what @code{sigwaitinfo}
does; other platforms may not do the same.