HI RT gang!
I have been attempting to debug an error that I think is occurring in an rt task
and figured that I would just use another FIFO to pass back error messages.
The problem is that it looks like when I opened that device on the Linux side
debug_hp_fifo = open("/dev/rtf0",O_RDWR);
it appears that the default read is a blocking read.... which is inconvenient for
my debugging, so I naively changed it to non-blocking :
debug_hp_fifo = open("/dev/rtf0",O_RDWR | O_NONBLOCK);
Although it did no longer appear to be a blocking read.... I could no longer
receive characters through the fifo!
In desperation, I started exploring "printk" which I later found out ONLY works
in the init modules.... although mine didn't work even there!
Help?
Dan Samber
Mount Sinai School of Medicine
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