Merge branch 'collectd-4.3' into collectd-4.4

[collectd.git] / src / plugin.c

diff --git a/src/plugin.c b/src/plugin.c
index 8b2803d..fdc0425 100644 (file)
--- a/src/plugin.c
+++ b/src/plugin.c
@@ -1,6 +1,6 @@
 /**
  * collectd - src/plugin.c
- * Copyright (C) 2005,2006  Florian octo Forster
+ * Copyright (C) 2005-2008  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
@@ -17,6 +17,7 @@
  *
  * Authors:
  *   Florian octo Forster <octo at verplant.org>
+ *   Sebastian Harl <sh at tokkee.org>
  **/
 
 #include "collectd.h"
@@ -53,6 +54,7 @@ typedef struct read_func_s read_func_t;
 static llist_t *list_init;
 static llist_t *list_read;
 static llist_t *list_write;
+static llist_t *list_flush;
 static llist_t *list_shutdown;
 static llist_t *list_log;
 static llist_t *list_notification;
@@ -146,14 +148,14 @@ static int plugin_load_file (char *file)
        {
                const char *error = lt_dlerror ();
 
-               ERROR ("lt_dlopen failed: %s", error);
-               fprintf (stderr, "lt_dlopen failed: %s\n", error);
+               ERROR ("lt_dlopen (%s) failed: %s", file, error);
+               fprintf (stderr, "lt_dlopen (%s) failed: %s\n", file, error);
                return (1);
        }
 
        if ((reg_handle = (void (*) (void)) lt_dlsym (dlh, "module_register")) == NULL)
        {
-               WARNING ("Couldn't find symbol ``module_register'' in ``%s'': %s\n",
+               WARNING ("Couldn't find symbol `module_register' in `%s': %s\n",
                                file, lt_dlerror ());
                lt_dlclose (dlh);
                return (-1);
@@ -437,6 +439,11 @@ int plugin_register_write (const char *name,
        return (register_callback (&list_write, name, (void *) callback));
 } /* int plugin_register_write */
 
+int plugin_register_flush (const char *name, int (*callback) (const int))
+{
+       return (register_callback (&list_flush, name, (void *) callback));
+} /* int plugin_register_flush */
+
 int plugin_register_shutdown (char *name,
                int (*callback) (void))
 {
@@ -531,6 +538,11 @@ int plugin_unregister_write (const char *name)
        return (plugin_unregister (list_write, name));
 }
 
+int plugin_unregister_flush (const char *name)
+{
+       return (plugin_unregister (list_flush, name));
+}
+
 int plugin_unregister_shutdown (const char *name)
 {
        return (plugin_unregister (list_shutdown, name));
@@ -568,22 +580,15 @@ void plugin_init_all (void)
        llentry_t *le;
        int status;
 
-       /* Start read-threads */
-       if (list_read != NULL)
-       {
-               const char *rt;
-               int num;
-               rt = global_option_get ("ReadThreads");
-               num = atoi (rt);
-               start_threads ((num > 0) ? num : 5);
-       }
-
        /* Init the value cache */
        uc_init ();
 
-       if (list_init == NULL)
+       if ((list_init == NULL) && (list_read == NULL))
                return;
 
+       /* Calling all init callbacks before checking if read callbacks
+        * are available allows the init callbacks to register the read
+        * callback. */
        le = llist_head (list_init);
        while (le != NULL)
        {
@@ -596,12 +601,25 @@ void plugin_init_all (void)
                                        "failed with status %i. "
                                        "Plugin will be unloaded.",
                                        le->key, status);
+                       /* Plugins that register read callbacks from the init
+                        * callback should take care of appropriate error
+                        * handling themselves. */
                        /* FIXME: Unload _all_ functions */
                        plugin_unregister_read (le->key);
                }
 
                le = le->next;
        }
+
+       /* Start read-threads */
+       if (list_read != NULL)
+       {
+               const char *rt;
+               int num;
+               rt = global_option_get ("ReadThreads");
+               num = atoi (rt);
+               start_threads ((num > 0) ? num : 5);
+       }
 } /* void plugin_init_all */
 
 void plugin_read_all (void)
@@ -643,6 +661,43 @@ void plugin_read_all (void)
        pthread_mutex_unlock (&read_lock);
 } /* void plugin_read_all */
 
+int plugin_flush_one (int timeout, const char *name)
+{
+       int (*callback) (int);
+       llentry_t *le;
+       int status;
+
+       if (list_flush == NULL)
+               return (-1);
+
+       le = llist_search (list_flush, name);
+       if (le == NULL)
+               return (-1);
+       callback = (int (*) (int)) le->value;
+
+       status = (*callback) (timeout);
+
+       return (status);
+} /* int plugin_flush_ont */
+
+void plugin_flush_all (int timeout)
+{
+       int (*callback) (int);
+       llentry_t *le;
+
+       if (list_flush == NULL)
+               return;
+
+       le = llist_head (list_flush);
+       while (le != NULL)
+       {
+               callback = (int (*) (int)) le->value;
+               le = le->next;
+
+               (*callback) (timeout);
+       }
+} /* void plugin_flush_all */
+
 void plugin_shutdown_all (void)
 {
        int (*callback) (void);