From: Francis Deslauriers <francis.deslauriers@efficios.com>
Date: Thu, 28 Jun 2018 13:47:51 +0000 (-0400)
Subject: Add lttng_event copy constructor
X-Git-Tag: v2.11.0-rc1~84
X-Git-Url: https://git.lttng.org./?a=commitdiff_plain;h=abcc74facc86124042abdb9fd4391b6eadda2b9e;p=lttng-tools.git

Add lttng_event copy constructor

Since the lttng_event structure now has an extended_ptr to store
additional data, such as a userspace probe location, we can't simply
memcpy the struct to duplicate it.
This commit introduces a lttng_event_copy function that allocates a new
lttng_event struct and copies the content of both the struct and its
extended_ptr.

Signed-off-by: Francis Deslauriers <francis.deslauriers@efficios.com>
Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>
---

diff --git a/include/lttng/event.h b/include/lttng/event.h
index 0131defcc..548ec2a46 100644
--- a/include/lttng/event.h
+++ b/include/lttng/event.h
@@ -304,6 +304,8 @@ extern int lttng_list_events(struct lttng_handle *handle,
 
 extern struct lttng_event *lttng_event_create(void);
 
+extern struct lttng_event *lttng_event_copy(const struct lttng_event *event);
+
 extern void lttng_event_destroy(struct lttng_event *event);
 
 /*
diff --git a/src/lib/lttng-ctl/event.c b/src/lib/lttng-ctl/event.c
index 9413b7052..046028cd2 100644
--- a/src/lib/lttng-ctl/event.c
+++ b/src/lib/lttng-ctl/event.c
@@ -54,6 +54,38 @@ error:
 	goto end;
 }
 
+struct lttng_event *lttng_event_copy(const struct lttng_event *event)
+{
+	struct lttng_event *new_event;
+	struct lttng_event_extended *new_event_extended;
+
+	new_event = zmalloc(sizeof(*event));
+	if (!event) {
+		PERROR("Error allocating event structure");
+		goto end;
+	}
+
+	/* Copy the content of the old event. */
+	memcpy(new_event, event, sizeof(*event));
+
+	/*
+	 * We need to create a new extended since the previous pointer is now
+	 * invalid.
+	 */
+	new_event_extended = zmalloc(sizeof(*new_event_extended));
+	if (!new_event_extended) {
+		PERROR("Error allocating event extended structure");
+		goto error;
+	}
+
+	new_event->extended.ptr = new_event_extended;
+end:
+	return new_event;
+error:
+	free(event);
+	goto end;
+}
+
 void lttng_event_destroy(struct lttng_event *event)
 {
 	struct lttng_event_extended *event_extended;