X-Git-Url: http://git.lttng.org/?a=blobdiff_plain;f=lttng-context-hostname.c;h=791fed4618f48a025ef1c543087dcb4cd5d1ac3e;hb=1b25fe5879436a90fd22a731e9d3371807e78ba1;hp=7cf7f7c849b6a9d9572257d76b1501c842a48aab;hpb=06254b0fe2a909dabb889fb0d022384906f6f37a;p=lttng-modules.git

diff --git a/lttng-context-hostname.c b/lttng-context-hostname.c
index 7cf7f7c8..791fed46 100644
--- a/lttng-context-hostname.c
+++ b/lttng-context-hostname.c
@@ -24,10 +24,10 @@
 #include <linux/slab.h>
 #include <linux/sched.h>
 #include <linux/utsname.h>
-#include "lttng-events.h"
-#include "wrapper/ringbuffer/frontend_types.h"
-#include "wrapper/vmalloc.h"
-#include "lttng-tracer.h"
+#include <lttng-events.h>
+#include <wrapper/ringbuffer/frontend_types.h>
+#include <wrapper/vmalloc.h>
+#include <lttng-tracer.h>
 
 #define LTTNG_HOSTNAME_CTX_LEN	(__NEW_UTS_LEN + 1)
 
@@ -65,6 +65,29 @@ void hostname_record(struct lttng_ctx_field *field,
 	}
 }
 
+static
+void hostname_get_value(struct lttng_ctx_field *field,
+		struct lttng_probe_ctx *lttng_probe_ctx,
+		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;
@@ -89,11 +112,9 @@ 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");