From b020e504e028f60a8721d59c3556a7f65bf6b790 Mon Sep 17 00:00:00 2001
From: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Date: Mon, 6 Feb 2012 18:16:40 -0500
Subject: [PATCH] Add environment information

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
---
 liblttng-ust/ltt-events.c | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/liblttng-ust/ltt-events.c b/liblttng-ust/ltt-events.c
index 71e959d6..9d5d8827 100644
--- a/liblttng-ust/ltt-events.c
+++ b/liblttng-ust/ltt-events.c
@@ -22,6 +22,7 @@
 #include <stddef.h>
 #include <inttypes.h>
 #include <time.h>
+#include <sys/prctl.h>
 #include "clock.h"
 
 #include <urcu-bp.h>
@@ -43,6 +44,8 @@
 #include "../libringbuffer/shm.h"
 #include "jhash.h"
 
+#define PROCNAME_LEN 17
+
 /*
  * The sessions mutex is the centralized mutex across UST tracing
  * control and probe registration. All operations within this file are
@@ -1088,6 +1091,7 @@ int _ltt_session_metadata_statedump(struct ltt_session *session)
 	struct ltt_channel *chan;
 	struct ltt_event *event;
 	int ret = 0;
+	char procname[PROCNAME_LEN] = "";
 
 	if (!CMM_ACCESS_ONCE(session->active))
 		return 0;
@@ -1140,6 +1144,22 @@ int _ltt_session_metadata_statedump(struct ltt_session *session)
 	if (ret)
 		goto end;
 
+	/* ignore error, just use empty string if error. */
+	(void) prctl(PR_GET_NAME, (unsigned long) procname, 0, 0, 0);
+	procname[PROCNAME_LEN - 1] = '\0';
+	ret = lttng_metadata_printf(session,
+		"env {\n"
+		"	vpid = %d;\n"
+		"	procname = \"%s\";\n"
+		"	domain = %s;\n"
+		"};\n\n",
+		(int) getpid(),
+		procname,
+		"ust"
+		);
+	if (ret)
+		goto end;
+
 	ret = lttng_metadata_printf(session,
 		"clock {\n"
 		"	name = %s;\n",
-- 
2.34.1