#!/usr/sbin/dtrace -s
#pragma D option quiet

:dtrace.so::function-entry
/ copyinstr(arg0) == "" /
{
        printf("%d -> %-30s\n", pid, copyinstr(arg1));
}

:dtrace.so::function-return
/ copyinstr(arg0) == "" /
{
        printf("%d <- %-30s\n", pid, copyinstr(arg1));
}