imp 5c7f6dfe4e devd kernel improvements:
1) Record all device events when devctl is enabled, rather than just when
   devd has devctl open.  This is necessary to prevent races between when
   a device arrives, and when devd starts.
2) Add hw.bus.devctl_disable to disable devctl, this can also be set as a
   tunable.
3) Fix async support. Reset nonblocking and async_td in open.  remove
   async flags.
4) Free all memory when devctl is disabled.

Approved by: re (blanket)
2002-11-30 00:49:43 +00:00
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