X-Git-Url: http://git.liburcu.org/?a=blobdiff_plain;f=lttng-context-hostname.c;h=0590207dfd33884f976d6054e0a76b1f0d34e9e6;hb=refs%2Fheads%2Fstable-2.7;hp=6dc14f9c1cfef5930059172d21ed0ed0fa6f61e0;hpb=3d0d43dbac505d33994f5a57f4f11021410fa417;p=lttng-modules.git

diff --git a/lttng-context-hostname.c b/lttng-context-hostname.c
index 6dc14f9c..0590207d 100644
--- a/lttng-context-hostname.c
+++ b/lttng-context-hostname.c
@@ -65,6 +65,28 @@ void hostname_record(struct lttng_ctx_field *field,
 	}
 }
 
+static
+void hostname_get_value(struct lttng_ctx_field *field,
+		union lttng_ctx_value *value)
+{
+	struct nsproxy *nsproxy;
+	struct uts_namespace *ns;
+	char *hostname;
+
+	/*
+	 * No need to take the RCU read-side lock to read current
+	 * nsproxy. (documented in nsproxy.h)
+	 */
+	nsproxy = current->nsproxy;
+	if (nsproxy) {
+		ns = nsproxy->uts_ns;
+		hostname = ns->name.nodename;
+	} else {
+		hostname = "";
+	}
+	value->str = hostname;
+}
+
 int lttng_add_hostname_to_ctx(struct lttng_ctx **ctx)
 {
 	struct lttng_ctx_field *field;
@@ -81,7 +103,7 @@ int lttng_add_hostname_to_ctx(struct lttng_ctx **ctx)
 	field->event_field.type.u.array.elem_type.atype = atype_integer;
 	field->event_field.type.u.array.elem_type.u.basic.integer.size = sizeof(char) * CHAR_BIT;
 	field->event_field.type.u.array.elem_type.u.basic.integer.alignment = lttng_alignof(char) * CHAR_BIT;
-	field->event_field.type.u.array.elem_type.u.basic.integer.signedness = is_signed_type(char);
+	field->event_field.type.u.array.elem_type.u.basic.integer.signedness = lttng_is_signed_type(char);
 	field->event_field.type.u.array.elem_type.u.basic.integer.reverse_byte_order = 0;
 	field->event_field.type.u.array.elem_type.u.basic.integer.base = 10;
 	field->event_field.type.u.array.elem_type.u.basic.integer.encoding = lttng_encode_UTF8;
@@ -89,11 +111,9 @@ int lttng_add_hostname_to_ctx(struct lttng_ctx **ctx)
 
 	field->get_size = hostname_get_size;
 	field->record = hostname_record;
+	field->get_value = hostname_get_value;
+	lttng_context_update(*ctx);
 	wrapper_vmalloc_sync_all();
 	return 0;
 }
 EXPORT_SYMBOL_GPL(lttng_add_hostname_to_ctx);
-
-MODULE_LICENSE("GPL and additional rights");
-MODULE_AUTHOR("Mathieu Desnoyers");
-MODULE_DESCRIPTION("Linux Trace Toolkit Perf Support");