Merge two SEGV fixes from the trunk:

abannert · abannert · commit 4bbf5a04ed21 · 2002-05-06T15:42:23.000Z
- startup SEGV caused by delaying the initialization too long.
- graceful restart SEGV caused by not re-initializing.
diff --git a/sapi/apache2filter/sapi_apache2.c b/sapi/apache2filter/sapi_apache2.c
@@ -437,6 +437,23 @@ static int
 php_apache_server_startup(apr_pool_t *pconf, apr_pool_t *plog,
                           apr_pool_t *ptemp, server_rec *s)
 {
+	void *data = NULL;
+	const char *userdata_key = "apache2filter_post_config";
+
+	/* Apache will load, unload and then reload a DSO module. This
+	 * prevents us from starting PHP until the second load. */
+	apr_pool_userdata_get(&data, userdata_key, s->process->pool);
+	if (data == NULL) {
+		/* We must use set() here and *not* setn(), otherwise the
+		 * static string pointed to by userdata_key will be mapped
+		 * to a different location when the DSO is reloaded and the
+		 * pointers won't match, causing get() to return NULL when
+		 * we expected it to return non-NULL. */
+		apr_pool_userdata_set((const void *)1, userdata_key,
+							  apr_pool_cleanup_null, s->process->pool);
+		return OK;
+	}
+
 	tsrm_startup(1, 1, 0, NULL);
 	sapi_startup(&apache2_sapi_module);
 	apache2_sapi_module.startup(&apache2_sapi_module);
