Merged revisions 640 and 642 from `trunk' to `tags/collectd-3.9.1'

[collectd.git] / src / plugin.h

diff --git a/src/plugin.h b/src/plugin.h
index 4a8b7ad..e1303c7 100644 (file)
--- a/src/plugin.h
+++ b/src/plugin.h
@@ -1,6 +1,6 @@
 /**
  * collectd - src/plugin.h
- * Copyright (C) 2005  Florian octo Forster
+ * Copyright (C) 2005,2006  Florian octo Forster
  *
  * This program is free software; you can redistribute it and/or modify it
  * under the terms of the GNU General Public License as published by the
@@ -23,6 +23,71 @@
 #ifndef PLUGIN_H
 #define PLUGIN_H
 
+/*
+ * NAME
+ *  plugin_set_dir
+ *
+ * DESCRIPTION
+ *  Sets the current `plugindir'
+ *
+ * ARGUMENTS
+ *  `dir'       Path to the plugin directory
+ *
+ * NOTES
+ *  If `dir' is NULL the compiled in default `PLUGINDIR' is used.
+ */
+void plugin_set_dir (const char *dir);
+
+/*
+ * NAME
+ *  plugin_count
+ *
+ * DESCRIPTION
+ *  trivial
+ *
+ * RETURN VALUE
+ *  The number of currently loaded plugins
+ */
+int plugin_count (void);
+
+/*
+ * NAME
+ *  plugin_exists
+ *
+ * DESCRIPTION
+ *  trivial
+ *
+ * ARGUMENTS
+ *  `type'      Name of the plugin.
+ *
+ * RETURN VALUE
+ *  Returns non-zero if a plugin with the name $type is found and zero
+ *  otherwise.
+ */
+int plugin_exists (char *type);
+
+/*
+ * NAME
+ *  plugin_load
+ *
+ * DESCRIPTION
+ *  Searches the current `plugindir' (see `plugin_set_dir') for the plugin
+ *  named $type and loads it. Afterwards the plugin's `module_register'
+ *  function is called, which then calls `plugin_register' to register callback
+ *  functions.
+ *
+ * ARGUMENTS
+ *  `type'      Name of the plugin to load.
+ *
+ * RETURN VALUE
+ *  Returns zero upon success, a value greater than zero if no plugin was found
+ *  and a value below zero if an error occurs.
+ *
+ * NOTES
+ *  No attempt is made to re-load an already loaded module.
+ */
+int  plugin_load (const char *type);
+
 int  plugin_load_all (char *dir);
 void plugin_init_all (void);
 void plugin_read_all (void);
@@ -31,9 +96,25 @@ void plugin_register (char *type,
                void (*init) (void),
                void (*read) (void),
                void (*write) (char *, char *, char *));
-#ifdef HAVE_LIBRRD
+
+/*
+ * NAME
+ *  plugin_write
+ *
+ * DESCRIPTION
+ *  Searches the plugin for `type' in the plugin-list. If found, and a `write'
+ *  function is registered, it's called. If either the plugin is not found or
+ *  the plugin doesn't provide a `write' function this function will return
+ *  without further notice.
+ *
+ * ARGUMENTS
+ *  `host'      Host(name) from which the data originates.
+ *  `type'      Name of the plugin.
+ *  `inst'      Instance (passed to the plugin's `write' function.
+ *  `val'       Values for the RRD files. Also passed to the plugin.
+ */
 void plugin_write    (char *host, char *type, char *inst, char *val);
-#endif /* HAVE_LIBRRD */
+
 void plugin_submit   (char *type, char *inst, char *val);
 
 #endif /* PLUGIN_H */