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From: Rich <rich@example.invalid>
Newsgroups: comp.os.linux.misc
Subject: Re: Are We Back to the "Wars" Now ?
Date: Wed, 18 Dec 2024 05:01:15 -0000 (UTC)
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186282@ud0s4.net <186283@ud0s4.net> wrote:
> On 12/17/24 8:23 PM, Lawrence D'Oliveiro wrote:
>> On Tue, 17 Dec 2024 13:34:30 +0000, Geoff Clare wrote:
>> 
>>> With a pipe or FIFO, you just use simple read and write operations 
>>> and the system handles all the messy stuff for you.  If the pipe 
>>> reaches capacity, write blocks until there is room to write some 
>>> more; if the pipe becomes empty, read blocks until there is more 
>>> data available; when read returns EOF that's the end of the data.
>> 
>> Yup. Furthermore:
>> 
>> * When the last writer closes its end, any remaining read attempts 
>> get EOF.
>> * When the last reader closes its end, any remaining write attempts 
>> get “broken pipe”.
> 
>   But you're still limited to the amount of RAM the system can 
>   access.

Not with a pipe or FIFO, which is what is being discussed above.

The amount of data you can transfer over a pipe is not in any way 
limited by system memory size or any other system imposed limits.

>   These days that's probably a LOT - but might NOT be,
>   esp for 'embedded' type boards like the older PIs,
>   BBBs and such. Never assume the user has essentially
>   infinite RAM.

The system will not have infinite RAM.  You can transfer infinite data 
over a pipe (although it will take a while to reach infinity).