Date: Thu, 3 Oct 2019 17:43:59 +0930 From: "O'Connor, Daniel" <darius@dons.net.au> To: Hans Petter Selasky <hps@selasky.org> Cc: Oleksandr Rybalko <ray@ddteam.net>, freebsd-usb@freebsd.org Subject: Re: USB serial ports by serial number Message-ID: <E84C0C56-0FE1-44C7-855C-ACC374148701@dons.net.au> In-Reply-To: <138601da-b6f9-f791-c6ef-ce54a4ae60e6@selasky.org> References: <CC980A9B-8F41-4C2A-A729-2CC690DFDA7E@dons.net.au> <CAJ1Oi8HeyBvn4UYSDAh8gGxj0hPv-vgFZ9ArNX95CTniuQa80g@mail.gmail.com> <40CAFE90-B8F6-4A9B-A6D0-671D2DCEED52@dons.net.au> <1f0a3207-89fd-0ddb-6049-91f114381386@selasky.org> <366762AE-757E-4EB4-9A51-8B513FE7BC42@dons.net.au> <138601da-b6f9-f791-c6ef-ce54a4ae60e6@selasky.org>
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> On 3 Oct 2019, at 17:41, Hans Petter Selasky <hps@selasky.org> wrote: >=20 > On 2019-10-03 09:37, O'Connor, Daniel wrote: >>> On 3 Oct 2019, at 17:01, Hans Petter Selasky <hps@selasky.org> = wrote: >>> On 2019-10-03 08:56, O'Connor, Daniel wrote: >>>> Most of USB-serial devices have "very stable" serial number:) >>>> more than 50% have S/N "0123456789". >>>=20 >>> It is also allowed to have no serial number. >> Yes, that's why I match sernum to '.+' to skip those. >>> Maybe some kind of "lstty" would do. >>>=20 >>> -l - list all devices >>> -s - match by serial >>> -v - match by vendor >>> -p - match by product >>> -i - match by interface ID >>> -t - type [USB/PCI] >>>=20 >>> which simply output the tty number you need. Could be an API we = could add to libusb. >> The problem is you can't modify some program to call a new API a lot = of the time but it is usually trivial to change which serial port it's = configured to use. >=20 > You don't need to change any program: >=20 > cu /dev/cuaU`lstty -s SERIAL` That doesn't work in a lot of cases, eg serial port is in some other = configuration file. Even in rc.conf it would be tricky since that file is read so often. -- Daniel O'Connor "The nice thing about standards is that there are so many of them to choose from." -- Andrew Tanenbaum
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