[ltt-dev] Getting writeTraceNetwork to work

[Thibault, Daniel]

   Back in May I asked about writeTraceNetwork, which stubbornly and ungracefully refused to work, raising an exception fatal for the tcf client.  I've tracked the problem down to invocations of flush_stream, which has been withdrawn from the code base for a long time now.  The last implementation seen in streams.c actually assigned an empty function to flush_stream, so it never actually did anything.

 

   Between versions 72ea7d0 (2011-Mar-23) and 7a8767c (2011-Aug-12) of lttng-agent, some of the errant calls to flush_stream have been deleted, but some still remain.  They must also be deleted in order to get writeTraceNetwork to work.

 

   The two small diffs I propose follow:

 

############################## lttctlustlibustdcallbacks.c ##############################

--- a/agent/lttctlustlibustdcallbacks.c   2011-08-12 11:02:15.000000000 -0400

+++ b/agent/lttctlustlibustdcallbacks.c   2011-09-22 16:51:06.000000000 -0400

@@ -85,7 +85,7 @@

     write_stream(out, 0);

 

     write_stream(out, MARKER_EOM);

-    flush_stream(out);

+//      flush_stream(out);

 

     pthread_barrier_wait(tcf_data->barrier);

 }

############################## lttctlclient.c ##############################

--- a/client/lttctlclient.c    2011-08-12 11:02:15.000000000 -0400

+++ b/client/lttctlclient.c    2011-09-22 17:10:40.000000000 -0400

@@ -480,9 +480,9 @@

             write_stringz(&c->out, args[i]);

     }

     write_stream(&c->out, MARKER_EOM);

-    flush_stream(&c->out);

+//  flush_stream(&c->out);

 

     /* fprintf(stderr, "lttctlclient : Just sent a cmd!\n"); */

 

############################## (end) ##############################

 

Daniel U. Thibault
R & D pour la défense Canada - Valcartier (RDDC Valcartier) / Defence R&D Canada - Valcartier (DRDC Valcartier)
Système de systèmes (SdS) / System of Systems (SoS)
Solutions informatiques et expérimentations (SIE) / Computing Solutions and Experimentations (CSE)
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