[Pcsclite-muscle] SCardBeginTransaction behavior under sharing violation

[Maksim Ivanov]

Hello,

SCardBeginTransaction() is documented as "there will be no action
taken" in case the reader is already locked. Also the
SCARD_E_SHARING_VIOLATION error code is documented to be returned in
case "someone else has exclusive rights".

However, judging from the implementation, it seems that the
SCardBeginTransaction enters a poll loop, waiting for particular
results from the daemon. If I'm reading it correctly, the loop doesn't
exit as long as SCARD_E_SHARING_VIOLATION is received from the daemon
(https://github.com/LudovicRousseau/PCSC/blob/52670e567267baf3579581f32ef3756a3644b9f2/src/winscard_clnt.c#L1193),
meaning that the function would never return this code to the caller.

If so, is this an oversight in the documentation, or rather in the
implementation?


Regards,
Maksim