On 2019-10-03 10:13, O'Connor, Daniel wrote:
On 3 Oct 2019, at 17:41, Hans Petter Selasky <h...@selasky.org> wrote:
On 2019-10-03 09:37, O'Connor, Daniel wrote:
On 3 Oct 2019, at 17:01, Hans Petter Selasky <h...@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".
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.
-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]
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.
You don't need to change any program:
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.
How about that we build the cuaX unit number by the location, and have a
sysctl for that?
unit = 0;
while (hubdepth--) {
unit *= numports;
unit += portno - 1;
}
unit *= maxifaces;
unit += device_get_unit(x);
Typically this should fit into a 32-bit integer, but we could also use a
64-bit integer.
--HPS
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