Improve xgps error message on gps_open().

1 files changed, 13 insertions, 1 deletions

diff --git a/xgps.c b/xgps.c
index 492bf80e..a94d7fe5 100644
--- a/xgps.c
+++ b/xgps.c
@@ -4,6 +4,7 @@
 #include <ctype.h>
 #include <unistd.h>
 #include <math.h>
+#include <errno.h>
 #include <Xm/Xm.h>
 #include <Xm/MwmUtil.h>
 #include <Xm/PushB.h>
@@ -338,6 +339,7 @@ int main(int argc, char *argv[])
     int option;
     char *colon, *server = NULL, *port = DEFAULT_GPSD_PORT;
     char *su, *au;
+    char *err_str = NULL;
 
     toplevel = XtVaAppInitialize(&app, "xgps", 
 			       options, XtNumber(options), 
@@ -384,7 +386,17 @@ altunits_ok:;
 
     gpsdata = gps_open(server, port);
     if (!gpsdata) {
-	fputs("xgps: no gpsd running or network error\n", stderr);
+	switch ( errno ) {
+	case NL_NOSERVICE: 	err_str = "can't get service entry"; break;
+	case NL_NOHOST: 	err_str = "can't get host entry"; break;
+	case NL_NOPROTO: 	err_str = "can't get protocol entry"; break;
+	case NL_NOSOCK: 	err_str = "can't create socket"; break;
+	case NL_NOSOCKOPT: 	err_str = "error SETSOCKOPT SO_REUSEADDR"; break;
+	case NL_NOCONNECT: 	err_str = "can't connect to host"; break;
+	default:             	err_str = "Unknown"; break;
+	}
+	fprintf( stderr, "xgps: no gpsd running or network error: %d, %s\n"
+		, errno, err_str);
 	exit(2);
     }