Mload-UTY2408 occurred while trying to record control output infomation

Mload-UTY2408 occurred while trying to record control output infomation - terminating

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LEARN ABOUT FREEBSD

devctl

DEVCTL(4)						   BSD Kernel Interfaces Manual 						 DEVCTL(4)

NAME

     devctl -- device event reporting and device control interface

DESCRIPTION

     The devctl device is used to report device events from the kernel.  Future versions will allow for some device control as well.

IMPLEMENTATION NOTES

     This design allows only one reader for /dev/devctl.  This is not desirable in the long run, but will get a lot of hair out of this implemen-
     tation.  Maybe we should make this device a clonable device.

     Also note: we specifically do not attach a device to the device_t tree to avoid potential chicken and egg problems.  One could argue that all
     of this belongs to the root node.	One could also further argue that the sysctl(3) interface that we have now might more properly be an
     ioctl(2) interface.

     SIGIO support is included in the driver.  However, the author is not sure that the SIGIO support is done correctly.  It was copied from a
     driver that had SIGIO support that likely has not been tested since FreeBSD 3.4 or FreeBSD 2.2.8!

     The read channel for this device is used to report changes to userland in realtime.  We return one record at a time.  If you try to read this
     device a character at a time, you will lose the rest of the data.	Listening programs are expected to cope.

     The sysctl hw.bus.devctl_queue can be used to control queue length. It is set to 0 to disable devctl when no devd(8) is running.

PROTOCOL

     The devctl device uses an ASCII protocol.	The driver returns one record at a time to its readers.  Each record is terminated with a newline.
     The first character of the record is the event type.

     Type    Description
     !	     A notify event, such as a link state change.
     +	     Device node in tree attached.
     -	     Device node in tree detached.
     ?	     Unknown device detected.

   Message Formats
     Except for the first character in the record, attach and detach messages have the same format.

	   Tdev at parent on location

     Part	 Description
     T		 + or -
     dev	 The device name that was attached/detached.
     parent	 The device name of the parent bus that attached the device.
     location	 Bus specific location information.

     The nomatch messages can be used to load devices driver.  If you load a device driver, then one of two things can happen.	If the device
     driver attaches to something, you will get a device attached message.  If it does not, then nothing will happen.

     The attach and detach messages arrive after the event.  This means one cannot use the attach message to load an alternate driver.	The attach
     message driver has already claimed this device.  One cannot use the detach messages to flush data to the device.  The device is already gone.

SEE ALSO

     devd(8)

BSD
								  March 26, 2014							       BSD

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