[wolletd]

Also, a lot of devices require very specific ioctl() commands to work with and don't provide everything as a file.

For example, you can't set the baudrate of a serial port by writing it to some /proc node.

[arghwhat]

nit: The ioctl syscall targets files just the same as the write syscall.

Everything being a file, and everything being read/write calls are different things. There's pros and cons.