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ifconfig: abort if loading a module fails other than for ENOENT
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Authored by asomers on Dec 25 2022, 6:09 PM.
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Details

Summary

If "ifconfig create" tries to load a kernel module, and the module
exists but can't be loaded, fail the command with a useful error
message. This is helpful, for example, when trying to create a cloned
interface in a vnet jail. But ignore ENOENT, because sometimes ifconfig
can't correctly guess the name of the required kernel module.

MFC after: 2 weeks

Test Plan

Manually tested

Diff Detail

Repository
rG FreeBSD src repository
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