Log the last way PPS thread can exit silently.

1 files changed, 6 insertions, 1 deletions

diff --git a/ntpshm.c b/ntpshm.c
index 0bb538cb..73df6524 100644
--- a/ntpshm.c
+++ b/ntpshm.c
@@ -627,10 +627,15 @@ static /*@null@*/ void *gpsd_ppsmonitor(void *arg)
      * is that no GPS lights up more than one of these pins.  By waiting on
      * all of them we remove a configuration switch.
      */
-    while (ioctl(session->gpsdata.gps_fd, TIOCMIWAIT, PPS_LINE_TIOC) == 0) {
+    while (1) {
 	int ok = 0;
 	char *log = NULL;
 
+        if (ioctl(session->gpsdata.gps_fd, TIOCMIWAIT, PPS_LINE_TIOC) != 0) {
+	    gpsd_report(LOG_ERROR, "PPS ioctl(TIOCMIWAIT) failed\n");
+	    break;
+	}
+
 /*@-noeffect@*/
 #ifdef HAVE_CLOCK_GETTIME
 	/* using  clock_gettime() here, that is nSec,