Enrico Scholz <enrico.scholz(a)wirtschaft.tu-chemnitz.de&gt; writes: I have posted a message concerning our problem in a newsgroup (de.comp.os.unix.programming). There was just a little response; a message says streams are not supported by linux and there are no plans to add it in the future. I think we should to use the fcntl-method at a linux system. I don't know if a system exists where both ioctl() and fnctl() are working. If this is possible, we have to prioritize one of them, but I can not say which one. Enrico -- eMail: enrico.scholz(a)wirtschaft.tu-chemnitz.de talk: ensc(a)ultra.csn.tu-chemnitz.de