how can I redirect the messages sent from kernel to a user app's stdin?
 

Hi,

I have an application that prints to a log what it gets from its stdin. I would like this application to also print to log messages the kernel creates(I.e. the same messages displayed by dmesg app).
How can I do it?

In other words, can I redirect the kernel messages (I.e. sent using printk) to an application's stdin pipe?

Thanks!
Hadar

rsyslog supports "named pipes" and "shell execute" actions, may one of these would suit. See 'man rsyslog.conf'

Thanks. I already found a different solution. I sent /proc/kmsg and other applications' stdout to a fifo, and use this fifo as an input file to my application.

Something like this:

mkfifo /tmp/misfifo;
cat /proc/kmsg > /tmp/misfifo &
... # Send other appluications logs to myfifo. E.g. ./CoolApp > /tmp/misfifo &
./MyApp < /tmp/misfifo # Use misfifo as an input file to my application

It works.
Thanks again!
Hadar

Cool, but doing "cat /proc/kmsg > /tmp/misfifo" is a manual process as opposed to redirecting automatically via rsyslog

kernel -> rsyslog -> named pipe/fifo -> your app