* informal survey regarding <{}
@ 1993-03-22 3:12 Byron Rakitzis
1993-03-22 3:32 ` Scott Merrilees
0 siblings, 1 reply; 2+ messages in thread
From: Byron Rakitzis @ 1993-03-22 3:12 UTC (permalink / raw)
To: rc
I was wondering if anyone in rc-land is using the <{} feature
with fifos.
Specifically, I've been thinking about ditching fifos in favor
of synchronous operation with tmp files.
Advantages:
o You can seek on a tmp file, so diff will work.
o tmp files are much closer in semantics to real pipes,
so I expect fewer bugs.
o fifos aren't present everywhere, files are.
o fifos don't work everywhere (e.g., the notorious
tmpfs bug), files do.
Disadvantages:
o Existing users might depend on fifos.
o Advantage of pipe in the kernel is lost; command must
wait on all the tmp files being written first.
I could even argue, based on the first item in "Advantages",
that one might want to use tmp files even over /dev/fd, but
I don't want to risk starting a flame war.
Anyway, reply to me and I can summarize to the list.
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: informal survey regarding <{}
1993-03-22 3:12 informal survey regarding <{} Byron Rakitzis
@ 1993-03-22 3:32 ` Scott Merrilees
0 siblings, 0 replies; 2+ messages in thread
From: Scott Merrilees @ 1993-03-22 3:32 UTC (permalink / raw)
To: Byron Rakitzis; +Cc: rc
>I was wondering if anyone in rc-land is using the <{} feature
>with fifos.
>
>Specifically, I've been thinking about ditching fifos in favor
>of synchronous operation with tmp files.
>
>Advantages:
>
> o You can seek on a tmp file, so diff will work.
> o tmp files are much closer in semantics to real pipes,
> so I expect fewer bugs.
> o fifos aren't present everywhere, files are.
> o fifos don't work everywhere (e.g., the notorious
> tmpfs bug), files do.
>
>Disadvantages:
>
> o Existing users might depend on fifos.
> o Advantage of pipe in the kernel is lost; command must
> wait on all the tmp files being written first.
>
>I could even argue, based on the first item in "Advantages",
>that one might want to use tmp files even over /dev/fd, but
>I don't want to risk starting a flame war.
>
>Anyway, reply to me and I can summarize to the list.
I'd be interested in the tmp file approach. Fifos don't work under
risc/os 4.52. I tried to write a /dev/fd file system for the kernel,
but am getting some kernel crashes because of undocumented
interfaces.
Is there anything wrong with having tmp files as the default, and
fifos & /dev/fd as options ?
Sm
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