Re: dtracing unlink

[RVP <rvp%SDF.ORG@localhost>]

On Fri, 20 Oct 2023, bch wrote:

> What OS release/architecture are you using that is getting favorable
> results?

$ uname -a
NetBSD x202e.localdomain 10.99.10 NetBSD 10.99.10 (GENERIC) #0: Thu Oct 19 23:43:40 UTC 2023  mkrepro%mkrepro.NetBSD.org@localhost:/usr/src/sys/arch/amd64/compile/GENERIC amd64

> I’m following along on ~up-to-the-minute -current AMD64 on my Thinkpad, and
> only seeing the same memory errors as wiz’ original example.

Do the copyinstr in ::entry like this:

```
#!/usr/sbin/dtrace -s

#pragma D option destructive
#pragma D option quiet

syscall::unlink:entry
{
	self->file = copyinstr(arg0);
}

syscall::unlink:return
{
	printf("%d %s\n", pid, self->file);
	self->file = 0;
}
```

And, forget that C file. It doesn't work under dtrace (and I don't even
recall if it ever did--probably why I commented it out...)

-RVP