currently, with these two libkvm functions:

     kvm_t *
     kvm_open(const char *execfile, const char *corefile, char *swapfile,
             int flags, const char *errstr);

     kvm_t *
     kvm_openfiles(const char *execfile, const char *corefile, char *swapfile,
             int flags, char *errbuf);

if a null pointer is passed for execfile, the man page states that:

     If this argument is NULL, the currently running system is
     assumed, which is indicated by _PATH_UNIX in <paths.h>.

would anyone find it particularly egregious if this was modified
slightly so that a null pointer caused it to default to
machdep.booted_kernel, and then to fall back to _PATH_UNIX if the
former was not found?

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