Implement filtering infrastructure

[lttng-modules.git] / lttng-context-vpid.c

diff --git a/lttng-context-vpid.c b/lttng-context-vpid.c
index ccb2023d3329b1050d0e87f0068a586a4b7c0e00..9a8df9a972b89f7c32dfa4335cde048f6b9ae1e5 100644 (file)
--- a/lttng-context-vpid.c
+++ b/lttng-context-vpid.c
@@ -56,6 +56,22 @@ void vpid_record(struct lttng_ctx_field *field,
        chan->ops->event_write(ctx, &vpid, sizeof(vpid));
 }
 
+static
+void vpid_get_value(struct lttng_ctx_field *field,
+               union lttng_ctx_value *value)
+{
+       pid_t vpid;
+
+       /*
+        * nsproxy can be NULL when scheduled out of exit.
+        */
+       if (!current->nsproxy)
+               vpid = 0;
+       else
+               vpid = task_tgid_vnr(current);
+       value->s64 = vpid;
+}
+
 int lttng_add_vpid_to_ctx(struct lttng_ctx **ctx)
 {
        struct lttng_ctx_field *field;
@@ -77,6 +93,7 @@ int lttng_add_vpid_to_ctx(struct lttng_ctx **ctx)
        field->event_field.type.u.basic.integer.encoding = lttng_encode_none;
        field->get_size = vpid_get_size;
        field->record = vpid_record;
+       field->get_value = vpid_get_value;
        lttng_context_update(*ctx);
        wrapper_vmalloc_sync_all();
        return 0;