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>