We've recently written a device driver (for Linux), and it uses
ioctl(2).  We use a separate C program which is also a BSD-socket
server to drive the device at the user-level.  The socket server is
for Java apps which also need to use the device.

If you want to use ioctl(2), you probably need JNI; even if the Linux
port of the JDK supports raw ioctl (as a "feature"), it won't be
standard.

        --troy



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