diff options
| -rw-r--r-- | gpsctl.c | 9 |
1 files changed, 8 insertions, 1 deletions
@@ -62,6 +62,13 @@ static void settle(struct gps_device_t *session) (void)tcdrain(session->gpsdata.gps_fd); } +/* + * Allows any response other than ERROR. Use it for queries where a + * failure return (due to, for example, a missing driver method) is + * immediate, but successful responses have unpredictable lag. + */ +#define NON_ERROR 0 /* must be distinct from any gps_mask_t value */ + static bool gps_query(/*@out@*/struct gps_data_t *gpsdata, gps_mask_t expect, const int timeout, @@ -131,7 +138,7 @@ static bool gps_query(/*@out@*/struct gps_data_t *gpsdata, } /*@ +ignorequals @*/ - if ((expect & gpsdata->set) != 0) + if ((expect == NON_ERROR) || (expect & gpsdata->set) != 0) return true; else if (time(NULL) - starttime > timeout) { gpsd_report(context.debug, LOG_ERROR, |