niceload: test + bugfix for --sensor

src/niceload

@@ -602,6 +602,7 @@ sub nonblockGetLines {
 
 sub read_sensor {
     my $self = shift;
+    ::debug("read_sensor");
     my $fh = $self->{'sensor_fh'};
     if(not $fh) {
 	# Start the sensor
@@ -612,13 +613,18 @@ sub read_sensor {
     my ($eof,@lines) = nonblockGetLines($fh);
     
     # new load = last full line
-    foreach my $line ( @lines ) {
+    foreach my $line (@lines) {
 	if(defined $line) {
-	    print "Pipe saw: $eof [$line]\n";
+	    ::debug("Pipe saw: $eof [$line]\n");
 	    $Global::last_sensor_reading = $line;
 	}
     }
-    if($eof) { undef($self->{'sensor_fh'}); }
+    if($eof) {
+	# End of file => Restart the sensor
+	close $fh;
+	open($fh, "-|", $::opt_sensor) || ::die_bug("Cannot open: $::opt_sensor");
+	$self->{'sensor_fh'} = $fh;
+    }
 
     return $Global::last_sensor_reading;
 }
@@ -627,6 +633,7 @@ sub load_status {
     # Returns:
     #   loadavg or sensor measurement
     my $self = shift;
+
     if($::opt_sensor) {
 	if(not defined $self->{'load_status'} or
 	   $self->{'load_status_cache_time'} + $self->{'recheck'} < time) {
@@ -635,7 +642,7 @@ sub load_status {
 		sleep 1;
 		$self->{'load_status'} = $self->read_sensor();
 	    } 
-	    $self->{'load_status_cache_time'} = time;
+	    $self->{'load_status_cache_time'} = time - 0.001;
 	}
     } else {
 	# Normal load avg

testsuite/tests-to-run/niceload02.sh

@@ -9,5 +9,11 @@ while uptime | grep -v age:.[1-9][0-9].[0-9][0-9] >/dev/null ; do (timeout 5 nic
 
 echo '### Test -p'
 perl -e '$|=1;while($t++<3){sleep(1);print "."}' &
-# The above should be suspended for at least 4 seconds
-stdout /usr/bin/time -f %e niceload -D -l 9 -p $! | perl -ne '$_ > 6 and print "OK\n"'
+# The above will normally take 3.6 sec
+# It should be suspended so it at least takes 5 seconds
+stdout /usr/bin/time -f %e niceload -l 8 -p $! | perl -ne '$_ >= 5 and print "OK\n"'
+
+echo "### Test --sensor -l negative"
+timeout 10 nice nice dd iflag=fullblock if=/dev/zero of=/dev/null bs=10G &
+niceload -t 1 --sensor 'free | field 3 | head -3|tail -1' -l -5000000 "free -g;echo more than 5 GB used"
+

testsuite/wanted-results/niceload02

@@ -3,3 +3,9 @@
 0 eq 0
 ### Test -p
 ...OK
+### Test --sensor -l negative
+             total       used       free     shared    buffers     cached
+Mem:             7          6          1          0          0          0
+-/+ buffers/cache:          6          1
+Swap:            9          2          7
+more than 5 GB used