X-Git-Url: http://git.lttng.org/?a=blobdiff_plain;f=liblttng-ust%2Flttng-context.c;h=fc2ab4f570b8182ef69f44a8e3375e5adcde1630;hb=77aa5901fd3f09001fb7e78f3533cf58c6d345e5;hp=16894ec1032b722407ce578d43f47051a62bbc60;hpb=5cf8141d2003c0e72279867015cb0afc50c82a77;p=lttng-ust.git

diff --git a/liblttng-ust/lttng-context.c b/liblttng-ust/lttng-context.c
index 16894ec1..fc2ab4f5 100644
--- a/liblttng-ust/lttng-context.c
+++ b/liblttng-ust/lttng-context.c
@@ -27,6 +27,11 @@
 #include <string.h>
 #include <assert.h>
 
+/*
+ * The filter implementation requires that two consecutive "get" for the
+ * same context performed by the same thread return the same result.
+ */
+
 int lttng_find_context(struct lttng_ctx *ctx, const char *name)
 {
 	unsigned int i;
@@ -41,6 +46,22 @@ int lttng_find_context(struct lttng_ctx *ctx, const char *name)
 	return 0;
 }
 
+int lttng_get_context_index(struct lttng_ctx *ctx, const char *name)
+{
+	unsigned int i;
+
+	if (!ctx)
+		return -1;
+	for (i = 0; i < ctx->nr_fields; i++) {
+		/* Skip allocated (but non-initialized) contexts */
+		if (!ctx->fields[i].event_field.name)
+			continue;
+		if (!strcmp(ctx->fields[i].event_field.name, name))
+			return i;
+	}
+	return -1;
+}
+
 /*
  * Note: as we append context information, the pointer location may change.
  */