sd_machine_get_class() may be used to determine the class of a
locally running virtual machine or container that is registered with
systemd-machined.service(8). The string returned is either "vm" or
"container". The returned string needs to be freed with the libc
free(3) call after use.
sd_machine_get_ifindices() may be used to determine the numeric
indices of the network interfaces on the host that are pointing
towards the specified locally running virtual machine or container
that is registered with systemd-machined.service(8). The returned
array needs to be freed with the libc free(3) call after use.
Returned errors may indicate the following problems:
The specified machine does not exist or is currently not running.
An input parameter was invalid (out of range, or NULL, where that
is not accepted).
Memory allocation failed.
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systemd 233 SD_MACHINE_GET_CLASS(3)