Path: utzoo!attcan!utgpu!jarvis.csri.toronto.edu!rutgers!tut.cis.ohio-state.edu!ucbvax!HNYKUN11.BITNET!U211344
From: U211344@HNYKUN11.BITNET (Olaf 'Rhialto' Seibert)
Newsgroups: comp.sys.amiga.tech
Subject: ACTION_CURRENT_VOLUME and TD_REMCHANGEINT
Message-ID: <8905261114.AA08919@jade.berkeley.edu>
Date: 26 May 89 11:57:50 GMT
Sender: daemon@ucbvax.BERKELEY.EDU
Lines: 41

I am currently busy writing a file system handler for messydos
diskettes, and I am having two problems about the things in the
subject line.

1. ACTION_CURRENT_VOLUME. My handler gets this packet when I return
the error ERROR_NO_DISK. Unfortunately, this packet is not documented
in any of the things that I have (all 1.1 RKMs and Dos manuals, and
the 1.3 autodocs). It seems that the value I return as a secondary
result (Result2), is used in the message No disk present in unit xx.
So if you return error 206 (ERROR_ACTION_NOT_KNOWN), you get a
requester saying No disk present in unit D9. ('0' + 206/10 == 'D')

I wonder what I must return in Result1. As long as I make it zero
(NULL), it works. But maybe the intention is that I return a BPTR
to the currently inserted VolumeNode there?

2. TD_REMCHANGEINT.  I have installed a disk change Interrupt to
notify the handler that a disk change has taken place. That works
like it should, even though it is very scarcely documented. But I
won't get the change Intterupt removed again, since there is
absolutely no indication what I should put in the io_Data field
of the TD_REMCHANGEINT IO request. I tried the two obvious things,
i.e. the same value as with TD_ADDCHANGEINT, a pointer to the
Interrupt structure, and a pointer to the (un-Reply()d)
TD_ADDCHANGEINT IO request. Both do not seem to work, although
DoIO returns 0.

Some experimentation with a debugger has shown that the ADD request
is the only thing on some List, which is not the List in the
ReplyPort. Its type is also still NT_MESSAGE. So WaitIO waits forever.

For now, I just Remove() the ADD request. I am certain that this is
NOT the correct way to do things. Could someone elaborate on the
arguments I should give with TD_REMCHANGEINT?

Freely_Distributable=Greetings(Not_For_Any_Commercial_Purpose)->
        Olaf.Seibert;

Astounding News! By Express Via Norfolk!   OS+2 is a trademark of
The Atlantic Crossed in Three Days!        Olaf 'Rhialto' Seibert
[E.A. Poe, 1844]                           U211344@hnykun11.bitnet