From: Florian Forster <octo@collectd.org>
Date: Sat, 10 Nov 2012 20:43:08 +0000 (+0100)
Subject: aggregation plugin: Handle the initial EAGAIN return value of rate_to_value().
X-Git-Tag: collectd-5.2.0~24^2
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=fde8b86f075b8829b196b489e0dc294ff888d6ed;p=thirdparty%2Fcollectd.git

aggregation plugin: Handle the initial EAGAIN return value of rate_to_value().

This avoids an annoying and confusing warning.
---

diff --git a/src/aggregation.c b/src/aggregation.c
index a92422348..e50557d91 100644
--- a/src/aggregation.c
+++ b/src/aggregation.c
@@ -241,6 +241,12 @@ static int agg_instance_read_func (agg_instance_t *inst, /* {{{ */
   status = rate_to_value (&v, rate, state, inst->ds_type, t);
   if (status != 0)
   {
+    /* If this is the first iteration and rate_to_value() was asked to return a
+     * COUNTER or a DERIVE, it will return EAGAIN. Catch this and handle
+     * gracefully. */
+    if (status == EAGAIN)
+      return (0);
+
     WARNING ("aggregation plugin: rate_to_value failed with status %i.",
         status);
     return (-1);