X-Git-Url: https://git.octo.it/?p=rrdtool.git;a=blobdiff_plain;f=bindings%2Fperl-piped%2FRRDp.pm;h=49c93696f50026d1449430c0b8cce96136ae32db;hp=31e10438a786e03eca289dc1802fca4e83e364c4;hb=56d67cdd0c5b2c27c9242a3d5810c7184917f663;hpb=219fd9224e3117dcf59df8818d4e9e3eab26022a

diff --git a/bindings/perl-piped/RRDp.pm b/bindings/perl-piped/RRDp.pm
index 31e1043..49c9369 100644
--- a/bindings/perl-piped/RRDp.pm
+++ b/bindings/perl-piped/RRDp.pm
@@ -42,9 +42,12 @@ start RRDtool. The argument must be the path to the RRDtool executable
 
 =item B<RRDp::cmd> I<rrdtool commandline>
 
-pass commands on to RRDtool. check the RRDtool documentation for
+pass commands on to RRDtool. Check the RRDtool documentation for
 more info on the RRDtool commands.
 
+B<Note>: Due to design limitations, B<RRDp::cmd> does not support the
+C<graph -> command - use C<graphv -> instead.
+
 =item $answer = B<RRDp::read>
 
 read RRDtool's response to your command. Note that the $answer variable will
@@ -66,7 +69,7 @@ running, System time is the time spend in system calls and real time
 is the total time RRDtool has been running.
 
 The difference between user + system and real is the time spent
-waiting for things like the hard disk and new input from the perl
+waiting for things like the hard disk and new input from the Perl
 script.
 
 =item B<$RRDp::error_mode> and B<$RRDp::error>
@@ -121,7 +124,7 @@ sub cmd (@);
 sub end ();
 sub read ();
 
-$VERSION=1.3002;
+$VERSION=1.4000;
 
 sub start ($){
   croak "rrdtool is already running"
@@ -187,6 +190,13 @@ sub cmd (@){
   }
   $cmd =~ s/\n/ /gs;
   $cmd =~ s/\s/ /gs;
+
+  # The generated graphs aren't necessarily terminated by a newline,
+  # causing RRDp::read() to wait for a line matching '^OK' forever.
+  if ($cmd =~ m/^\s*graph\s+-\s+/) {
+    croak "RRDp does not support the 'graph -' command - "
+        . "use 'graphv -' instead";
+  }
   print RRDwriteHand "$cmd\n";
 }