I tried once more, and this time with /dev/bus/usb only.

How can there be five processes with the same file opened?

[EMAIL PROTECTED]:~# lsof  |grep /dev/bus/
ifdhandle 26749       root    3u      CHR            189,273              
51693 /dev/bus/usb/003/018
ifdhandle 26761       root    3u      CHR            189,273              
51693 /dev/bus/usb/003/018
ifdhandle 26765       root    3u      CHR            189,273              
51693 /dev/bus/usb/003/018
ifdhandle 26775       root    3u      CHR            189,273              
51693 /dev/bus/usb/003/018
ifdhandle 26819       root    3u      CHR            189,273              
51693 /dev/bus/usb/003/018
[EMAIL PROTECTED]:~# 

all of them open it with O_EXCL?

does O_EXCL not work standalone? should I use flock or something like
that instead to prevent several processes accessing the same file?
Or are usb device file somehow special and those methods do not work?

Thanks for your help.

Regards, Andreas



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