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To: KILOREUX Emperex <kiloreux@gmail.com>
cc: freebsd-arch@freebsd.org, Koop Mast <kwm@freebsd.org>, eadler@freebsd.org, 
 =?UTF-8?B?SmVhbi1Tw6liYXN0aWVuIFDDqWRyb24=?= <dumbbell@freebsd.org>
Subject: Re: API to link sysctl nodes to devices
In-reply-to: <CAN1JrQ2dd0WZi0_aaNdqH9xdy292tP2DYLxvKV9bfK93vYFLXw@mail.gmail.com>
From: "Poul-Henning Kamp" <phk@phk.freebsd.dk>
References: <CAN1JrQ2dd0WZi0_aaNdqH9xdy292tP2DYLxvKV9bfK93vYFLXw@mail.gmail.com>
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Date: Sat, 04 Jun 2016 08:52:49 +0000
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--------
In message <CAN1JrQ2dd0WZi0_aaNdqH9xdy292tP2DYLxvKV9bfK93vYFLXw@mail.gmail=
.com>
, KILOREUX Emperex writes:

>As part of my participation GSOC, I have been working on an API spec to
>link sysctl nodes to devices.

It's not really the sysctl nodes as such you should focus on, but
rather on the gap between (the increasingly inaccurately named)
newbus and devfs.

The poster-boy example is how you get from USB bus coordinates to
/dev/da* or /dev/{tty|cua}U* devices.

devd(8) seems to know the linkage and usually I resort to /etc/devd
entries like this to make it liveable:

	attach 1000 {
		match "device-name"     "uftdi[0-9]*";
		match "vendor"          "0x0403";
		match "product"         "0x6001";
		match "sernum"          "FTHAV9UU";
		action "ln -s /dev/cua$ttyname /dev/bbb1";
	};

	notify 1000 {
		match "system"          "USB";
		match "subsystem"       "DEVICE";
		match "type"            "DETACH";
		match "vendor"          "0x0403";
		match "product"         "0x6001";
		match "sernum"          "FTHAV9UU";
		action "rm -f /dev/bbb1";
	};


-- =

Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
phk@FreeBSD.ORG         | TCP/IP since RFC 956
FreeBSD committer       | BSD since 4.3-tahoe    =

Never attribute to malice what can adequately be explained by incompetence=
.