Let scdaemon exit when no reader is available

[Werner Koch]

On Wed, 21 Nov 2012 02:37, gniibe at fsij.org said:

> Here is a patch which let scdaemon exit when it detects removal of a
> card reader.  It is to discuss the issue of scdaemon keeps polling
> (for insertion) after removal of a card reader.  It is not yet to
> handle card removal.

Thus your patch is a hack which works because gpg-agent will start
scdaemon anyway if it requires it.

We can give it a try for 2.1.  Can you please add a comment in the code,
explaining why it is useful to exit.


Shalom-Salam,

   Werner

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