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From: John Reagan <johnrreagan@earthlink.net>
Newsgroups: comp.os.vms
Subject: Re: Fun trick
Date: Mon, 13 Jan 2025 21:11:29 -0500
Organization: i2pn2 (i2pn.org)
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On 1/13/2025 5:55 PM, Arne Vajhøj wrote:
> On 1/13/2025 5:18 PM, Lawrence D'Oliveiro wrote:
>> On Mon, 13 Jan 2025 13:45:50 -0500, Arne Vajhøj wrote:
>>> There are probably a lot of shareable images written in C out there
>>> where the developer has no idea that they are runnable or what code will
>>> run.
>>
>> If it has no main(), then nothing will run.
> 
> That is what the developer thinks.
> 
> But it is not so.
> 
> $ type lawrence.c
> #include <stdio.h>
> 
> int foobar()
> {
>      printf("Hi Lawrence\n");
>      return 1;
> }
> $ cc lawrence
> $ link/share  lawrence
> $ run lawrence
> Hi Lawrence
> 
> No main() and it runs anyway.
> 
> Arne
> 
COBOL paragraphs behave like C.  First routine/PARAGRAPH gets a WEAK 
transfer address.  Linker finds the first one.  Shuffle modules around 
and you'll get different transfer addresses.  Pascal just creates a 
STRONG transfer address for a PROGRAM statement.