[Info-vax] About $ run /mailbox DCL command

[VAXman- at SendSpamHere.ORG]

In article <a3880dd7-4951-4926-b571-fa4e2087a833 at j9g2000vby.googlegroups.com>, A famous IT technical writer <Philippe.vouters at laposte.net> writes:
>On Jan 4, 6:10=A0pm, moro... at world.std.spaamtrap.com (Michael Moroney)
>wrote:
>> hb <becker.... at gmail.com> writes:
>> >On Jan 4, 4:53=3DA0pm, IanMiller <g... at uk2.net> wrote:
>> >> I don't think the mailbox driver supports a timeout directly.
>> >> In a program you can set a timer and abort the I/O.
>> >The mailbox driver supports IO$M_NOW. That's not a timeout, or only a
>> >very short one :-) It looks like the DCL read doesn't set this I/O
>> >modifier for mailboxes; neither by default nor on request. Coding an
>> >own read utility with this looks like a SMOP.
>>
>> If I recall correctly, READ/TIME_OUT=3D0 does set IO$M_NOW on a mailbox
>> read. =A0No other values for /TIME_OUT are supported or work.
>
>Me too, I have no working pure DCL solution to offer Tristan. As I
>tested it, the DCL read/time_out just hanged my VMS session even not
>responding to CTRL-Y. I did propose Tristan some C code which does
>what he wants. However he said he has already one but was forward
>looking a pure DCL solution. If someone is interested with my C code,
>let it me know by email you'll find at http://vouters.dyndns.org/ If
>it happens there is demand for, I may especially write an article
>describing everything I know on this subject. This will describe the
>read/time_out non DCL solution and the corresponding workaround which
>interfaces with DCL.
>
>As another topic related subject, I misunderstood what the OpenVMS
>manual say about lib$set_symbol. Jim's f$cvui() lexical function made
>me more rework this subject. I thus wrote a special article upon at
>http://vouters.dyndns.org/tima/OpenVMS-lib$set_symbol-lib$set_symbol_only_s=
>et_a_string_symbol_type.html
>If I did not clearly understood what the VMS manual states, this may
>be as well unclear to other readers. Hence this special article
>attempting to make things clear for everyone about what one can expect
>from this VMS routine.

Use SYS$CLI (CHMS) if you want to set integer symbols.

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