illumos gate

When attempting to list devices with cfgadm, if none are present, then both config_list() and config_list_ext() return CFGA_NOTSUPP as an error message. When this is presented, a user is presented with the following:

# cfgadm -al
'cfgadm: Configuration administration not supported'

In this case, this error message would be much clearer if the program indicated that there were no devices to administer as it was a virtual machine with no devices that cfgadm could operate on. It likely would make sense to add a specific error type that indicates there were no supported devices as this error message is also used when operating in a non-global zone, where it would make a lot more sense..