Non-fatal broken-pipe error on `bye` response

[ankostis]

Thank you for sharing your utility code.

From latest master(636b545), on first use I'm getting the following error on syslogs, but the thing is working:

Oct  2 08:25:53 hostname gpg-agent[599]: scdaemon[607]: DBG: asking for PIN '||Please enter the PIN%0A[sigs done: 48]'
Oct  2 08:25:53 hostname gpg-agent[599]: /path/to/pinentry-auto: line 58: echo: write error: Broken pipe

• Haven't studied the pinentry-protocol, but could it be that on bye command, no response is expected?
• Do you know a url for the pinentry-protocol?