Android ioctl - root permissions and usage?

There is no means for a non-root process to become root (beyond exploits), so yes, you need a separate process.

Ioctl() calls do not explicitly require root permission (or any specific permission) to use. As Chris Stratton said, you'll need permission to access the particular device in question. If you don't have said permission, you're not going to get it other than exploits.

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