kvm_geterr —
get error message on kvm descriptor
Kernel Data Access Library (libkvm, -lkvm)
#include <kvm.h>
char *
  
  kvm_geterr(kvm_t
    *kd);
This function returns a string describing the most recent error condition on the
  descriptor 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().