gistfile1.txt

# cat zdop.d 
pid$target::zdoor_open:entry
{
        printf("zdoor_open(%s, %s)\n",
                copyinstr(arg1), copyinstr(arg2));
}
# dtrace -p $(pgrep beam.smp) -s zdop.d
dtrace: script 'zdop.d' matched 1 probe
CPU     ID                    FUNCTION:NAME
  6  73992                 zdoor_open:entry zdoor_open(gs516-2743-builder, _joyent_sshd_key_is_authorized)
....