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I think my last mail did not reach the
mailing list, so sending it again. Regards, Gaurav. From: Hi All, I have written a small module which uses the kernel timer
and puts the reading process to sleep for specific time (30 seconds). I am getting some problem in it ……. The problem
is that when I load the module and read the module created “/proc/timer_wait” file using
‘head’ or ‘cat’ command, then my timer_read_proc()
function (see the use_timer.c file in attachment) is called by kernel twice. I am not able to understand why it is called two times. I am
attaching the output of ‘dmesg’ command. The attached text file
(dmesg_output.txt) contains only the kernel messages related to my module. The output of reading process is that, for the first time it
displays what I want it to display but after that it displays garbage and it also
make the shell prompt filled with garbage ….. it does not show ascii
characters after that on shell prompt. If you are using windows, please open the attached file in
WordPad, else it will not be correctly displayed. Please help. Thanks in Advance. Regards, Gaurav. |
Loading Module: my_timer.o Loaded Successfully Module: my_timer.o We are in My_Timer read_proc() routine. Added timer to Kernel Timer Queue successfully ..... Going to Sleep. We are in My_Timer Handler. Waking up the sleeping processes on Timer Wait Queue. Woked up by My_Timer handler. We are in My_Timer read_proc() routine. Added timer to Kernel Timer Queue successfully ..... Going to Sleep. We are in My_Timer Handler. Waking up the sleeping processes on Timer Wait Queue. Woked up by My_Timer handler.
Attachment:
use_timer.c
Description: use_timer.c
