leak-detective: LEAK_DETECTIVE_DISABLE completely disables LD

If lib->leak_detective is non-null some code parts (e.g. the plugin
loader) assume LD is actually used.

src/libstrongswan/library.c

@@ -265,8 +265,11 @@ bool library_init(char *settings, const char *namespace)
 
 #ifdef LEAK_DETECTIVE
 	lib->leak_detective = leak_detective_create();
-	lib->leak_detective->set_report_cb(lib->leak_detective,
+	if (lib->leak_detective)
-									   report_leaks, sum_leaks, NULL);
+	{
+		lib->leak_detective->set_report_cb(lib->leak_detective,
+										   report_leaks, sum_leaks, NULL);
+	}
 #endif /* LEAK_DETECTIVE */
 
 	pfh = printf_hook_create();

src/libstrongswan/utils/leak_detective.c

@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2013 Tobias Brunner
+ * Copyright (C) 2013-2014 Tobias Brunner
  * Copyright (C) 2006-2013 Martin Willi
  * Hochschule fuer Technik Rapperswil
  *
@@ -973,17 +973,20 @@ leak_detective_t *leak_detective_create()
 		},
 	);
 
+	if (getenv("LEAK_DETECTIVE_DISABLE") != NULL)
+	{
+		free(this);
+		return NULL;
+	}
+
 	lock = spinlock_create();
 	thread_disabled = thread_value_create(NULL);
 
 	init_static_allocations();
 
-	if (getenv("LEAK_DETECTIVE_DISABLE") == NULL)
+	if (register_hooks())
 	{
-		if (register_hooks())
+		enable_leak_detective();
-		{
-			enable_leak_detective();
-		}
 	}
 	return &this->public;
 }

src/libstrongswan/utils/leak_detective.h

@@ -50,9 +50,7 @@ typedef void (*leak_detective_summary_cb_t)(void* user, int count, size_t bytes,
 										    int whitelisted);
 
 /**
- * Leak detective finds leaks and bad frees using malloc hooks.
+ * Leak detective finds leaks and invalid frees using malloc hooks.
- *
- * Currently leaks are reported to stderr on destruction.
  *
  * @todo Build an API for leak detective, allowing leak enumeration, statistics
  * and dynamic whitelisting.
@@ -62,13 +60,12 @@ struct leak_detective_t {
 	/**
 	 * Report leaks to the registered callback functions.
 	 *
-	 * @param detailed 		TRUE to resolve line/filename of leak (slow)
+	 * @param detailed 		TRUE to resolve line/filename of leaks (slow)
 	 */
 	void (*report)(leak_detective_t *this, bool detailed);
 
 	/**
-	 * Report current memory usage to out.
+	 * Set callback functions invoked when report() is called.
-	 * Set callback functions invoked during a report().
 	 *
 	 * @param cb			callback invoked for each detected leak
 	 * @param scb			summary callback invoked at end of report
@@ -78,11 +75,11 @@ struct leak_detective_t {
 						  leak_detective_summary_cb_t scb, void *user);
 
 	/**
-	 * Report current memory usage using a callbacks.
+	 * Report current memory usage using callback functions.
 	 *
 	 * @param cb			callback invoked for each allocation
 	 * @param scb			summary callback invoked at end of usage report
-	 * @param user			user data supplied to callbacks
+	 * @param user			user data to supply to callbacks
 	 */
 	void (*usage)(leak_detective_t *this, leak_detective_report_cb_t cb,
 				  leak_detective_summary_cb_t scb, void *user);
@@ -109,7 +106,10 @@ struct leak_detective_t {
 };
 
 /**
- * Create a leak_detective instance.
+ * Create a leak_detective instance, unless the LEAK_DETECTIVE_DISABLE
+ * environment variable is set.
+ *
+ * @return					leak detective instance
  */
 leak_detective_t *leak_detective_create();