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bug#6900: mktemp: want option to make a fifo

From: Eric Blake
Subject: bug#6900: mktemp: want option to make a fifo
Date: Mon, 23 Aug 2010 16:55:58 -0600
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On 08/23/2010 04:49 PM, John Reiser wrote:
On 08/23/2010 02:22 PM, Paul Eggert wrote:
On 08/23/2010 01:40 PM, John Reiser wrote:
Two independent user requests [one of which
includes code!] within a few months show a definite need.

The two requests would have been more convincing if they demonstrated
a definite need.  Neither did: they both just said the equivalent
of "we need a new option".

Consider a pipeline with three logical stages:   A | B1 | C
where B1 is a shell script.  At some point B1 notices that one
parallel process B2 becomes desirable, such that B2 also pipes
into the same C as B1, and output from a *subset* of the multiple
sequential subprocesses of B1 pipes into the same B2 [view in
constant-width font]:
A |  B1   | C
        \  /
where both slashes also indicate fifos.

Thanks for the example scenario. Next, could you please show the shell code that you are currently using, along with a version with your proposed 'mktemp --fifo', to show the difference in usage paradigms between the two approaches? We may be able to help you efficiently re-write your existing code into an equally manageable but more portable solution using existing tools, or it may help to convince us that the shorthand is truly useful. But without seeing actual usage examples, I can't say.

Eric Blake   address@hidden    +1-801-349-2682
Libvirt virtualization library http://libvirt.org

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