[Info-vax] Orphaned processes on OpenVMS

[Jan-Erik Soderholm]

Johnny Billquist wrote 2011-05-27 03:47:
> On 2011-05-26 13.36, Rob Brown wrote:
>> On Thu, 26 May 2011 at 11:50 -0700, Johnny Billquist wrote:
>>
>>> On 2011-05-26 11.43, Rob Brown wrote:
>>>>
>>>> In VMS, as Bob says, you must initialize before you can mount.
>>>
>>> Interesting. So you (or anyone) is allowed to do I/O to an unmounted
>>> disk?
>>
>> Who prevents it in M-Plus? I can't remember when or if I last tried
>> this. Can I not, as a privileged or as a non-privileged user, do
>> disk-driver QIOs to an unmounted disk? Somebody must be able to,
>> otherwise how would MOUNT work?
>
> No, no I/O is allowed to an unmounted disk in M+. This is controlled by the
> QIO directive processing itself.
> Check around line 480 (label 46$) and forward in LB:[11,10]DRQIO.MAC
>
> Mount is not doing only doing I/O. In order for any I/O operation (with a
> few exceptions) to be allowed, the volume valid bit must be set.
> Mount starts by setting the volume valid, before it do any I/O, and then
> resets it again, in case the mount wasn't good.
>
>>> That would (to me) seem like a weird thing. So when is there ever a
>>> point for foreign mounted disks in VMS?
>>
>> Tradition? Looks like RMS needs the disk to be mounted. I wonder if RMS
>> is used for device-mode I/O as well as for file I/O.
>
> Well, RMS cannot play with foreign disks, or...?
>
>> $ ld connect deleteme.dsk
>> %LD-I-UNIT, Allocated device is OMEGA$LDA2:
>> $ dump/block=count=1 lda2: !LDA2 is not mounted
>> %DUMP-E-OPENIN, error opening LDA2:[BROWN.TEMP].; as input
>> -RMS-E-DNR, device not ready, not mounted, or unavailable
>> $ mount lda2 test
>> %MOUNT-I-MOUNTED, TEST mounted on _OMEGA$LDA2:
>> $ dump/block=count=1 lda2: !LDA2 is mounted files-11
>> %DUMP-E-READERR, error reading LDA2:
>> -SYSTEM-F-NOPRIV, insufficient privilege or object protection violation
>> $ dismount lda2:
>> $ mount lda2 test/for
>> %MOUNT-I-MOUNTED, TEST mounted on _OMEGA$LDA2:
>> $ dump/block=count=1 lda2: !LDA2 is mounted foreign
>>
>> Dump of device LDA2: on 26-MAY-2011 14:25:21.84
>>
>> Logical block number 0 (00000000), 512 (0200) bytes
>>
>> 03039401 001E65C0 11C00200 15C600A0 ......e...... 000000
>> ...
>
> Hmm. Ok. So it does not actually allow I/O to unmounted volumes. So, is
> disk file struction initialization special, in order to allow that I/O?
>
> Johnny
>

INIT neads the device to be ALLOCated, not MOUNTed, if I'm not wrong.