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Re: Coproc usage ... not understanding


From: Chet Ramey
Subject: Re: Coproc usage ... not understanding
Date: Tue, 09 Aug 2011 20:50:01 -0400
User-agent: Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.6; en-US; rv:1.9.2.18) Gecko/20110616 Lightning/1.0b2 Thunderbird/3.1.11

On 8/9/11 8:19 PM, Linda Walsh wrote:
> Linda Walsh wrote:
>>     I did think of that...but I thought when the foreground
>> process closes 'input', then all of the chained utils should see 'eof', and
>> should then flush their output...at least that was my belief in how they
>> "should" be working...(sigh)...
> ---
>     Um...that got me to thinking..
> 
>     When you spawn off the coproc, and the parent has the I/O handles
> to the child in COPROCNAME[0/1],   does the child have a copy of that as well?

The parent and child retain the appropriate ends of the pipe and close
the others.  The parent's copies are set close-on-exec.  Maybe that's the
problem.

-- 
``The lyf so short, the craft so long to lerne.'' - Chaucer
                 ``Ars longa, vita brevis'' - Hippocrates
Chet Ramey, ITS, CWRU    address@hidden    http://cnswww.cns.cwru.edu/~chet/



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