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Commit 092a212e authored by Paolo 'Blaisorblade' Giarrusso's avatar Paolo 'Blaisorblade' Giarrusso Committed by Greg Kroah-Hartman
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USB: usbmon doc update - mention new wildcard ('0') bus 



Update usbmon documentation, mentioning the "zero" (wildcard) bus.
Possibly, in my first hunk, the 'either ... or ...' should be rephrased a bit to
be expressed better.

Signed-off-by: default avatarPaolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it>
Cc: Pete Zaitcev <zaitcev@redhat.com>
Cc: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
parent ce0d9325

Documentation/usb/usbmon.txt

+8 −1
Original line number Diff line number Diff line
@@ -34,9 +34,12 @@ if usbmon is built into the kernel. 
Verify that bus sockets are present.



# ls /sys/kernel/debug/usbmon

1s  1t  1u  2s  2t  2u  3s  3t  3u  4s  4t  4u

0s  0t  0u  1s  1t  1u  2s  2t  2u  3s  3t  3u  4s  4t  4u

#



Now you can choose to either use the sockets numbered '0' (to capture packets on

all buses), and skip to step #3, or find the bus used by your device with step #2.



2. Find which bus connects to the desired device



Run "cat /proc/bus/usb/devices", and find the T-line which corresponds to
@@ -56,6 +59,10 @@ Bus=03 means it's bus 3. 


# cat /sys/kernel/debug/usbmon/3u > /tmp/1.mon.out



to listen on a single bus, otherwise, to listen on all buses, type:



# cat /sys/kernel/debug/usbmon/0u > /tmp/1.mon.out



This process will be reading until killed. Naturally, the output can be

redirected to a desirable location. This is preferred, because it is going

to be quite long.