From: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Date: Wed, 3 Apr 2019 20:26:45 +0000 (-0400)
Subject: Fix: relayd: handling of lttng_read errors >= 0
X-Git-Url: http://git.efficios.com/?p=deliverable%2Flttng-tools.git;a=commitdiff_plain;h=2239b15a8b2a1f0bd81c9c1da3d74de3529ca493

Fix: relayd: handling of lttng_read errors >= 0

errno is only set when lttng_read returns a negative value. Else, we
need to print a ERR() statement rather than use PERROR().

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>
---

diff --git a/src/common/index/index.c b/src/common/index/index.c
index fae1bfd4b..40ac0de19 100644
--- a/src/common/index/index.c
+++ b/src/common/index/index.c
@@ -171,10 +171,14 @@ int lttng_index_file_read(const struct lttng_index_file *index_file,
 	}
 
 	ret = lttng_read(fd, element, len);
-	if (ret < len) {
+	if (ret < 0) {
 		PERROR("read index file");
 		goto error;
 	}
+	if (ret < len) {
+		ERR("lttng_read expected %zu, returned %zd", len, ret);
+		goto error;
+	}
 	return 0;
 
 error: