[Info-vax] Still no DIR/SORT_BY_TIME

[David Froble]

Johnny Billquist wrote:
> On 2015-08-17 14:50, Simon Clubley wrote:
>> On 2015-08-16, Johnny Billquist <bqt at softjar.se> wrote:
>>> On 2015-08-16 20:05, Simon Clubley wrote:
>>>> BTW, does RSX also have a read regardless mode ?
>>>
>>> Not sure what you mean by that. Maybe you can explain in more detail
>>> what you're asking, and then I can answer. :-)
>>>
>>
>> With RSTS/E, when opening a file, you could specify various options
>> using a mode field which was a bitfield encoded integer. Opening a file
>> with mode 4096 allowed you to open and read a file when you normally be
>> blocked due to an incompatible open mode from another currently running
>> program.
> 
> Hmm. Essentially bypassing file locking?
> 
>> It's been a _long_ time since I last used it, but I think (IIRC) it
>> could even be used to see the current contents of a file which was
>> exclusively opened for writing by another program. (Assuming you had
>> suitable access rights to the file of course.)
> 
> That sounds even more like bypassing file locking.
> 
> No, in RSX, if a file is locked from shared access by a program, another 
> program cannot bypass that. That would defeat the point of denying 
> shared access.
> However, default is for programs to open files in a way that other 
> programs can still access the file read-only. Only shared write access 
> is by default denied. You have to explicitly open a file with shared 
> write access if you really want to do that.
> 
> I should check. It might be that a privileged program can circumvent 
> this, but I'm not sure.
> 
>     Johnny
> 

Think "/IGNORE=INTERLOCK"