add global persistant broker storage

This PR adds a global key/value storage which is persitant over reloads (but not restarts).
The storage could be used from neb modules to store data over reloads like this:

```c
// fetch global storage
struct kvvec *global_store = get_global_store();

// store string value
kvvec_addkv_str(global_store, "example_key", (char *)mkstr("%s", "example string value"));

// read string from storage
char *persistant = kvvec_fetch_str_str(global_store, "example_key");
```

Signed-off-by: Sven Nierlein <[email protected]>

src/naemon/broker.c

@@ -12,6 +12,12 @@
 #include <string.h>
 #include <sys/time.h>
 
+static struct kvvec global_store = KVVEC_INITIALIZER;
+
+struct kvvec *get_global_store(void)
+{
+	return &global_store;
+}
 
 /* gets timestamp for use by broker */
 static inline void get_broker_timestamp(struct timeval *timestamp)

src/naemon/broker.h

@@ -167,6 +167,7 @@
 
 NAGIOS_BEGIN_DECL
 
+struct kvvec *get_global_store(void);
 void broker_program_state(int, int, int);
 void broker_log_data(int, int, int, char *, unsigned long, time_t);
 int broker_event_handler(int, int, int, int, void *, int, int, struct timeval, struct timeval, double, int, int, int, char *, char *, char *);

src/naemon/naemon.c

@@ -135,6 +135,7 @@ int main(int argc, char **argv)
 	nagios_macros *mac;
 	const char *worker_socket = NULL;
 	int i;
+	struct kvvec *global_store;
 
 #ifdef HAVE_GETOPT_H
 	int option_index = 0;
@@ -227,6 +228,11 @@ int main(int argc, char **argv)
 	                                        G_LOG_FLAG_RECURSION, nm_g_log_handler, NULL);
 	mac = get_global_macros();
 
+	global_store = get_global_store();
+	if (global_store && !kvvec_init(global_store, 0)) {
+		exit(ERROR);
+	}
+
 	/* if we're a worker we can skip everything below */
 	if (worker_socket) {
 		exit(nm_core_worker(worker_socket));