X-Git-Url: https://git.lttng.org/?p=lttng-tools.git;a=blobdiff_plain;f=src%2Fbin%2Flttng%2Fcommands%2Fenable_events.c;h=2af85fe476eb74abaf71ea7b456a6ee1723408b1;hp=231dac3fbd50c4cdf295c89c20ca1038182cedd5;hb=8571134087a7a1fbd83924ab5b98836ce6ca840a;hpb=7972aab22f74b18faa168c0482216a3dd711a075

diff --git a/src/bin/lttng/commands/enable_events.c b/src/bin/lttng/commands/enable_events.c
index 231dac3fb..2af85fe47 100644
--- a/src/bin/lttng/commands/enable_events.c
+++ b/src/bin/lttng/commands/enable_events.c
@@ -154,8 +154,8 @@ static void usage(FILE *ofp)
 	fprintf(ofp, "                               TRACE_DEBUG          = 14\n");
 	fprintf(ofp, "                               (shortcuts such as \"system\" are allowed)\n");
 	fprintf(ofp, "    --filter \'expression\'\n");
-	fprintf(ofp, "                           Filter expression on event fields,\n");
-	fprintf(ofp, "                           event recording depends on evaluation.\n");
+	fprintf(ofp, "                           Filter expression on event fields and context.\n");
+	fprintf(ofp, "                           Event recording depends on evaluation.\n");
 	fprintf(ofp, "                           Only specify on first activation of\n");
 	fprintf(ofp, "                           a given event within a session.\n");
 	fprintf(ofp, "                           Filter only allowed when enabling\n");
@@ -175,7 +175,20 @@ static void usage(FILE *ofp)
 	fprintf(ofp, "                           'seqfield1 == \"te*\"'\n");
 	fprintf(ofp, "                           In string literals, the escape character is '\\'.\n");
 	fprintf(ofp, "                           Use '\\*' for the '*' character, and '\\\\' for\n");
-	fprintf(ofp, "                           the '\\' character.\n");
+	fprintf(ofp, "                           the '\\' character. Wildcard match any sequence of,\n");
+	fprintf(ofp, "                           characters including an empty sub-string (match 0 or\n");
+	fprintf(ofp, "                           more characters).\n");
+	fprintf(ofp, "\n");
+	fprintf(ofp, "                           Context information can be used for filtering. The\n");
+	fprintf(ofp, "                           examples below show usage of context filtering on\n");
+	fprintf(ofp, "                           process name (with a wildcard), process ID range, and\n");
+	fprintf(ofp, "                           unique thread ID for filtering. The process and\n");
+	fprintf(ofp, "                           thread ID of running applications can be found under\n");
+	fprintf(ofp, "                           columns \"PID\" and \"LWP\" of the \"ps -eLf\" command.\n");
+	fprintf(ofp, "\n");
+	fprintf(ofp, "                           '$ctx.procname == \"demo*\"'\n");
+	fprintf(ofp, "                           '$ctx.vpid >= 4433 && $ctx.vpid < 4455'\n");
+	fprintf(ofp, "                           '$ctx.vtid == 1234'\n");
 	fprintf(ofp, "\n");
 }
 
@@ -425,7 +438,6 @@ static int enable_events(char *session_name)
 			ret = lttng_enable_event_with_filter(handle, &ev, channel_name,
 						opt_filter);
 			if (ret < 0) {
-				fprintf(stderr, "Ret filter: %d\n", ret);
 				switch (-ret) {
 				case LTTNG_ERR_FILTER_EXIST:
 					WARN("Filter on events is already enabled"
@@ -434,9 +446,8 @@ static int enable_events(char *session_name)
 					break;
 				case LTTNG_ERR_FILTER_INVAL:
 				case LTTNG_ERR_FILTER_NOMEM:
-					ERR("%s", lttng_strerror(ret));
 				default:
-					ERR("Setting filter: '%s'", opt_filter);
+					ERR("%s", lttng_strerror(ret));
 					break;
 				}
 				goto error;
@@ -497,7 +508,7 @@ static int enable_events(char *session_name)
 
 			if (opt_loglevel) {
 				MSG("Kernel loglevels are not supported.");
-				ret = CMD_UNDEFINED;
+				ret = CMD_UNSUPPORTED;
 				goto error;
 			}
 
@@ -530,7 +541,7 @@ static int enable_events(char *session_name)
 			case LTTNG_EVENT_SYSCALL:
 			default:
 				ERR("Event type not available for user-space tracing");
-				ret = CMD_UNDEFINED;
+				ret = CMD_UNSUPPORTED;
 				goto error;
 			}
 
@@ -621,6 +632,7 @@ int cmd_enable_events(int argc, const char **argv)
 	int opt, ret = CMD_SUCCESS;
 	static poptContext pc;
 	char *session_name = NULL;
+	int event_type = -1;
 
 	pc = poptGetContext(NULL, argc, argv, long_options, 0);
 	poptReadDefaultConfig(pc, 0);
@@ -669,6 +681,17 @@ int cmd_enable_events(int argc, const char **argv)
 			ret = CMD_UNDEFINED;
 			goto end;
 		}
+
+		/* Validate event type. Multiple event type are not supported. */
+		if (event_type == -1) {
+			event_type = opt_event_type;
+		} else {
+			if (event_type != opt_event_type) {
+				ERR("Multiple event type not supported.");
+				ret = CMD_ERROR;
+				goto end;
+			}
+		}
 	}
 
 	opt_event_list = (char*) poptGetArg(pc);