scd: More changes on watching removal of card/reader.
* scd/app-common.h (struct app_ctx_s): Rename field to periodical_check_needed. * scd/scdaemon.c (update_usb): Rename from update_fdset_for_usb. Don't use libusb_get_pollfds any more. (scd_kick_the_loop): New. (need_tick): Follow the rename. (handle_connections): No libusb event handling here. * scd/app.c (app_new_register): Follow the change of rename. (select_application, scd_update_reader_status_file): Likewise. * scd/ccid-driver.c (ccid_usb_thread_is_alive): New. (intr_cb): Call scd_kick_the_loop. (ccid_usb_thread): New. Thread to invoke INTERRUPT callback. (ccid_open_usb_reader): Add thread invocation. (ccid_require_get_status): Remove LIBUSB_WORKS_EXPECTED_FOR_INTERRUPT_ENDP. (do_close_reader): Carefully handle handle->transfer. (get_escaped_usb_string): Insert npth_unprotect/npth_protect. (do_close_reader, bulk_out, bulk_in, abort_cmd, ccid_slot_status) (ccid_transceive, ccid_transceive_secure): Likewise.
It found that libusb_get_pollfds is not supported on Windows.
Besides, it's a bit difficult to use for the select loop.
Thus, we use the thread named ccid_usb_thread, instead.
- Signed-off-by: NIIBE Yutaka <gniibe@fsij.org>