问DTrace -如何正确检索返回探测器中的初始参数

EN

pid$target:foo:bar:entry
{
    self->arg0 = arg0;
    self->arg1 = arg1;
    /*
     * Avoid the race in which dtrace(1) attaches to the victim during
     * the window between the two probes.
     */
    self->trace = 1;
}

pid$target:foo:bar:return
/self->trace/
{
    printf("arg0 = 0x%x, arg1 = 0x%x\n", self->arg0, self->arg1);
    /* Deallocate the thread-local storage. */
    self->arg0 = 0;
    self->arg1 = 0;
}