devreserv reserves devices for exclusive use. When the device is no longer required,
use devfree to release it.
devreserv reserves at most one device per device-list. Each list is searched in linear order until the first available device is found. If a device cannot be reserved from each list, the entire reservation fails.
When devreserv is invoked without arguments, it lists the devices that are currently reserved and shows to which key it was reserved. When devreserv is invoked with only the key argument, it lists the devices that are currently
reserved to that key.
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