network: Add missing freeaddrinfo on error path.

[collectd.git] / contrib / examples / myplugin.c

diff --git a/contrib/examples/myplugin.c b/contrib/examples/myplugin.c
index aa8c49c..d95f10b 100644 (file)
--- a/contrib/examples/myplugin.c
+++ b/contrib/examples/myplugin.c
@@ -78,20 +78,21 @@ static int my_init(void) {
 } /* static int my_init (void) */
 
 /*
- * This function is called in regular intervalls to collect the data.
+ * This is a utility function used by the read callback to populate a
+ * value_list_t and pass it to plugin_dispatch_values.
  */
-static int my_read(void) {
-  value_t values[1]; /* the size of this list should equal the number of
-                                            data sources */
+static int my_submit(gauge_t value) {
   value_list_t vl = VALUE_LIST_INIT;
 
-  /* do the magic to read the data */
-  values[0].gauge = random();
-
-  vl.values = values;
+  /* Convert the gauge_t to a value_t and add it to the value_list_t. */
+  vl.values = &(value_t){.gauge = value};
   vl.values_len = 1;
-  vl.time = time(NULL);
-  sstrncpy(vl.host, hostname_g, sizeof(vl.host));
+
+  /* Only set vl.time yourself if you update multiple metrics (i.e. you
+   * have multiple calls to plugin_dispatch_values()) and they need to all
+   * have the same timestamp. */
+  /* vl.time = cdtime(); */
+
   sstrncpy(vl.plugin, "myplugin", sizeof(vl.plugin));
 
   /* it is strongly recommended to use a type defined in the types.db file
@@ -102,7 +103,18 @@ static int my_read(void) {
 
   /* dispatch the values to collectd which passes them on to all registered
    * write functions */
-  plugin_dispatch_values(&vl);
+  return plugin_dispatch_values(&vl);
+}
+
+/*
+ * This function is called in regular intervalls to collect the data.
+ */
+static int my_read(void) {
+  /* do the magic to read the data */
+  gauge_t value = random();
+
+  if (my_submit(value) != 0)
+    WARNING("myplugin plugin: Dispatching a random value failed.");
 
   /* A return value != 0 indicates an error and the plugin will be skipped
    * for an increasing amount of time. */