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Subject: Re: The joy of pipes
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Date: Sat, 16 Nov 2024 00:37:35 -0500
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On 11/15/24 6:20 AM, Louis Krupp wrote:
> On 11/15/2024 12:49 AM, 186282@ud0s4.net wrote:
>> On 11/14/24 9:05 PM, Lawrence D'Oliveiro wrote:
>>> On Thu, 14 Nov 2024 16:09:07 -0800, John Ames wrote:
>>>
>>>> (I think it was a topic shift to applications of *nix pipes...?)
>>>
>>> Oh shelly boy, the pipes, the pipes are calling ...
>>
>>   Pipes are good.
>>
>>   But, really, they're just temp files the parent
>>   process can access.
> 
> Pipes *could* be implemented with temporary disk files, at least to an 
> extent, but as far as I can tell, they're not.


   Well, they can be on ACTUAL disk space - or on
   a RAMdisk or just a reserved stretch of RAM.

   The last one is quickest - but most taxing on
   run-time resources.


> Quoting from this page:
> 
> https://www.geeksforgeeks.org/piping-in-unix-or-linux/#
> 
>     In Linux, a pipe is not a regular file but a type of inter-process
>     communication (IPC) mechanism that acts as a buffer, which can be
>     used to connect the output of one process to the input of another.
>     Although pipes are not files, they are implemented using file
>     descriptors and share many behaviors with files. They exist only in
>     memory and do not have a presence in the file system, unlike regular
>     files.

   There are clearly a lot of ways to implement "pipes".
   'C' does it the 'C' way.

   IF you are doing multi-threaded/process style pgms then you
   almost HAVE to use them if you want to xmit more than
   a few bytes between parents/children. A few years back
   I was experimenting with TCP/UDP servers and found that
   it could be very useful to transmit a few dozen bytes
   worth of active data between parents/children.

   SO ... learn yer pipes !