From 9769c37cbb0e2bcf56c6e5ad8a065e5d166781f9 Mon Sep 17 00:00:00 2001
From: Sebastian Harl <sh@tokkee.org>
Date: Mon, 4 Dec 2006 11:30:29 +0100
Subject: [PATCH] plugin.[ch]: Added support for an optional plugin shutdown
 function.

A plugin may register a shutdown function using plugin_register_shutdown ().
This function is called when collectd terminates either during normal
termination or after SIGINT or SIGTERM have been received.

Signed-off-by: Sebastian Harl <sh@tokkee.org>
---
 src/collectd.c |  2 ++
 src/plugin.c   | 30 ++++++++++++++++++++++++++++++
 src/plugin.h   |  4 ++++
 3 files changed, 36 insertions(+)

diff --git a/src/collectd.c b/src/collectd.c
index 64da5765..a1e15bf1 100644
--- a/src/collectd.c
+++ b/src/collectd.c
@@ -444,6 +444,8 @@ int main (int argc, char **argv)
 #endif
 		start_client ();
 
+	plugin_shutdown_all ();
+
 #if COLLECT_DEBUG
 	if (logfile != NULL)
 		DBG_STOPFILE("debug file closed.");
diff --git a/src/plugin.c b/src/plugin.c
index 697449e2..46a1c617 100644
--- a/src/plugin.c
+++ b/src/plugin.c
@@ -34,6 +34,7 @@ typedef struct plugin
 	void (*init) (void);
 	void (*read) (void);
 	void (*write) (char *host, char *inst, char *val);
+	void (*shutdown) (void);
 	struct plugin *next;
 } plugin_t;
 
@@ -285,6 +286,19 @@ void plugin_read_all (const int *loop)
 			(*p->read) ();
 }
 
+/*
+ * Call `shutdown' on all plugins (if given)
+ */
+void plugin_shutdown_all (void)
+{
+	plugin_t *p;
+
+	for (p = first_plugin; NULL != p; p = p->next)
+		if (NULL != p->shutdown)
+			(*p->shutdown) ();
+	return;
+}
+
 /*
  * Add plugin to the linked list of registered plugins.
  */
@@ -317,10 +331,26 @@ void plugin_register (char *type,
 	p->read  = read;
 	p->write = write;
 
+	p->shutdown = NULL;
+
 	p->next = first_plugin;
 	first_plugin = p;
 }
 
+/*
+ * Register the shutdown function (optional).
+ */
+int plugin_register_shutdown (char *type, void (*shutdown) (void))
+{
+	plugin_t *p = plugin_search (type);
+
+	if (NULL == p)
+		return -1;
+
+	p->shutdown = shutdown;
+	return 0;
+}
+
 /*
  * Send received data back to the plugin/module which will append DS
  * definitions and pass it on to ``rrd_update_file''.
diff --git a/src/plugin.h b/src/plugin.h
index a77c87fb..45e9b494 100644
--- a/src/plugin.h
+++ b/src/plugin.h
@@ -101,11 +101,15 @@ int  plugin_load_all (char *dir);
 void plugin_init_all (void);
 void plugin_read_all (const int *loop);
 
+void plugin_shutdown_all (void);
+
 void plugin_register (char *type,
 		void (*init) (void),
 		void (*read) (void),
 		void (*write) (char *, char *, char *));
 
+int plugin_register_shutdown (char *, void (*) (void));
+
 /*
  * NAME
  *  plugin_write
-- 
2.30.2