Enrico Scholz <enrico.scholz(a)wirtschaft.tu-chemnitz.de&gt; writes: I think somebody should write an autoconf test to check which of these actually works. What would nice to find out is why glibc defines these ioctl when it doesn't support them? Do you have the glibc info files? Do they say something about these settings? Jan -- Jan Vroonhof http://www.math.ethz.ch/~vroonhof/ Mathematik, vroonhof ＠ math.ethz.ch HG E16, ETH-Zentrum, Tel: +41-1-6325456/25154 Raemistrasse 101, CH-8092 Zuerich. Fax: +41-1-6321085