best way to programatically test if the module is installed? about can-isotp HOT 6 OPEN

yes, the interface is part of the address, which is required to call bind, but not create the socket structure.
To create the socket, you need to know the protocol, e.g : family, message type, protocol ID (CAN, datagram, ISOTP)

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Example here: https://github.com/linux-can/can-utils/blob/master/isotpsend.c#L254-L286
Line 254 should fail if the module isn't loaded

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Possibly modinfo can_isotp can be used to see if it is installed, but I'm not sure if it can tell me if it is actually able to successfully load.

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Also, when running isotprecv -s 123 -d 321 -l can0 I get

can: controller area network core
NET: Registered PF_CAN protocol family
can: isotp protocol

/var/log/syslog

.

Not sure if there is a way to trigger the registering of the PF_CAN protocol family other than trying to open a socket?

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You know, you can create a socket without binding it to an address.
It will fail if the module isn't loaded, succeed without interfering with the bus if it is installed.

Seems like it is what you need. Is there an issue I don't know of?

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I thought there might be a cleaner way, but I think that might work.

Does this approach work even if there are no CAN interfaces present on the machine?

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