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 <>
Cc: Pete Zaitcev <>
Cc: Alan Stern <>
Signed-off-by: default avatarGreg Kroah-Hartman <>
parent ce0d9325
......@@ -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.
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