This function returns a string describing the most recent error condition
on the descriptor
Fa kd .
The results are undefined if the most recent
kvm(3)
library call did not produce an error.
The string returned is stored in memory owned by
kvm(3)
so the message should be copied out and saved elsewhere if necessary.
This routine cannot be used to access error conditions due to a failed
kvm_openfiles ();
call, since failure is indicated by returning a
NULL
descriptor.
Therefore, errors on open are output to the special error buffer
passed to
kvm_openfiles (.);
This option is not available to
kvm_open (.);
