Date: Sat, 24 Oct 2009 20:00:53 -0600 (MDT) From: Warren Block <wblock@wonkity.com> To: current@freebsd.org Subject: Creating /dev links to dynamic devices Message-ID: <alpine.BSF.2.00.0910241934310.23784@wonkity.com>
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devfs.conf allows creating static device links:
link acd0 cdrom
This only runs on devfs startup, so it's useless for creating a link to
a dynamic device.
The specific example is for scanners. My scanner is ugen2.3, but only
as long as it is plugged into the same USB hub/port each time. I can
manually create a uscanner0 link in /dev with devd.conf:
attach 20 {
device-name "ugen[0-9]+";
match "vendor" "0x04b8";
match "product" "0x010a";
action "/bin/ln -sf /dev/$device-name /dev/uscanner0; /sbin/devfs rule applyset";
};
Using /dev/uscanner0 then works in place of ugen2.3.
Now the second part of the example: I want devd to recognize the attach
or creation of uscanner0. But it's not a true devfs device; devd
doesn't see an attach event, or a notify CDEV/CREATE event.
Is there a method to create a true devfs link to a dynamic device?
-Warren Block * Rapid City, South Dakota USA
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