monitor/analyze: Inline data to gnuplot

Instead of creating a separate file just to write the x:y axis inline
the data via gnuplot $data variable then use it to plot.

diff --git a/monitor/analyze.c b/monitor/analyze.c
index 62a7716..213405d 100755 (executable)
--- a/monitor/analyze.c
+++ b/monitor/analyze.c
@@ -114,35 +114,28 @@ static void tmp_write(void *data, void *user_data)
 
 static void plot_draw(struct queue *queue)
 {
-       const char *filename = "analyze.tmp";
-       FILE *gplot = popen("gnuplot", "w");
-       FILE *tmp;
+       FILE *gplot;
 
-       if (!gplot)
+       if (queue_length(queue) < 2)
                return;
 
-       if (queue_isempty(queue))
-               goto done;
-
-       tmp = fopen(filename, "w");
-       if (!tmp)
-               goto done;
+       gplot = popen("gnuplot", "w");
+       if (!gplot)
+               return;
 
-       queue_foreach(queue, tmp_write, tmp);
+       fprintf(gplot, "$data << EOD\n");
+       queue_foreach(queue, tmp_write, gplot);
+       fprintf(gplot, "EOD\n");
 
        fprintf(gplot, "set terminal dumb enhanced ansi\n");
        fprintf(gplot, "set xlabel 'Latency (ms)'\n");
        fprintf(gplot, "set tics out nomirror\n");
        fprintf(gplot, "set log y\n");
        fprintf(gplot, "set yrange [0.5:*]\n");
-       fprintf(gplot, "plot './%s' using 1:2 t 'Packets' w impulses\n",
-                                                               filename);
+       fprintf(gplot, "plot $data using 1:2 t 'Packets' w impulses\n");
        fflush(gplot);
 
-       fclose(tmp);
-done:
        pclose(gplot);
-       unlink(filename);
 }
 
 static void chan_destroy(void *data)
@@ -168,8 +161,7 @@ static void chan_destroy(void *data)
                print_field("~%lld Kb/s TX transfer speed",
                                chan->tx_bytes * 8 / TV_MSEC(chan->tx_l.total));
 
-       if (chan->num > 1)
-               plot_draw(chan->plot);
+       plot_draw(chan->plot);
 
        free(chan);
 }