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backfire

NAME

backfire - send a signal from driver to user

DESCRIPTION

The backfire driver reads a numerical string that is sent to the /dev/backfire device and sends the corresponding signal to the calling user program. Reading from /dev/backfire returns the time of the day when the most recent sent request was serviced or 0, if a sent request was not yet received. The time of the day is displayed in seconds since 1970-01-01 00:00:00 UTC followed by the fraction of the second in microseconds separated by a comma.

PURPOSE

The backfire driver is normally used in combination with the program sendme to benchmark the performance of the kernel's signal sending capabilities.

EXAMPLES

 head -1 /dev/backfire
 0,0
 trap "echo Got signal 7" 7
 echo 7 >/dev/backfire
 Got signal 7
 head -1 /dev/backfire
 1234567890,123456
 

AUTHORS

Carsten Emde <C.Emde@osadl.org>

SEE ALSO

sendme(8)