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Query about call-process

From: Narendra Joshi
Subject: Query about call-process
Date: Sat, 31 Mar 2018 00:17:09 +0530


The document string for `call-process' says that
>           You can’t directly specify a buffer to put the error output
>           in; that is too difficult to implement.  But you can achieve
>           this result by sending the error output to a temporary file
>           and then inserting the file into a buffer when the subprocess
>           finishes.

I would like to understand what makes doing this difficult? 

Narendra Joshi

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