> On 7 Oct 2023, at 6:28 am, Kirk Wolf <[email protected]> wrote:
>
> This is a thread that won't die.
And there has been some absolute tosh spouted!
>
> In z/OS, environment variables are in Language Environment, in the CEEEDB
> ("Enclave Data Block"). If your assembler code is running in LE, you can
> access/set them. An empty table is created when the enclave is initialized,
> which can be BEFORE dubbing which happens at the first kernel call. Look
> in the LE books if you don't believe me.
I believe you. It’s dependent on the OS. On Linux environment variables are
stored in the proc file system, /proc/<pid>/environ. Whoever stated it’s part
of the C runtime doesn’t know what they’re talking about.
>
> Kirk Wolf
> Dovetailed Technologies
> http:// <http://dovetail.com>coztoolkit.com
>
> On Thu, Oct 5, 2023, at 8:15 PM, Seymour J Metz wrote:
>> The issue isn't what has access to environmental variables, but rather what
>> creates them.
>>
>> Further, they are useful in other contexts. An otherwise legacy program that
>> uses a Unix command may need to pass the odd environment variable to control
>> options for which there are no switches.
>>
>> ________________________________________
>> From: IBM Mainframe Discussion List <[email protected]> on behalf of
>> Jon Perryman <[email protected]>
>> Sent: Thursday, October 5, 2023 9:06 PM
>> To: [email protected]
>> Subject: Re: Assembler access to USS functions
>>
>> On Thu, 5 Oct 2023 20:54:56 +0000, Seymour J Metz <[email protected]> wrote:
>>
>>> Even if you have an OMVS segment, you don't get dubbed ntil you use a Unix
>>> service.
>>
>> Environment variables are not unique to UNIX and do not require dubbing. It
>> is a feature of the C/C++ language that is in the STDLIB (standard library)
>> and can be used in any environment.
>>
>> Environment variables are only useful in languages that do not support
>> global variables or inter-language global variables is not supported. I
>> suspect that C and Cobol global variables are shared because of LE.
>> Languages like shells, Python, Java and others which are runtime languages
>> don't have access to C and Cobol global variables which makes environment
>> variables a simple inter-language-communications feature.
>>
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