Fix Ctrl+C handling under Cygwin.

drivers/fet_core.c

@@ -547,8 +547,6 @@ device_status_t fet_poll(device_t dev_base)
 {
 	struct fet_device *dev = (struct fet_device *)dev_base;
 
-	ctrlc_reset();
-
 	if (fet_proto_xfer(&dev->proto, C_STATE, NULL, 0, 1, 0) < 0) {
 		printc_err("fet: polling failed\n");
 		power_end(dev);
@@ -624,6 +622,7 @@ int fet_ctl(device_t dev_base, device_ctl_t action)
 			return -1;
 		}
 
+		ctrlc_reset();
 		return 0;
 
 	case DEVICE_CTL_HALT:

util/util.c

@@ -124,6 +124,12 @@ void ctrlc_reset(void)
 
 int ctrlc_check(void)
 {
+#ifdef __CYGWIN__
+	/* Cygwin's signal emulation seems to require the process to
+	 * block.
+	 */
+	delay_ms(1);
+#endif
 	return ctrlc_flag;
 }
 #endif