default write log to file.

@@ -21,8 +21,10 @@ ff_log_dir          ./objs/logs;
 # the log tank, console or file.
 # if console, print log to console.
 # if file, write log to file. requires srs_log_file if log to file.
-# default: console.
-srs_log_tank        console;
+# default: file.
+srs_log_tank        file;
+# when srs_log_tank is file, specifies the log file.
+# default: ./objs/srs.log
 srs_log_file        ./objs/srs.log;
 # the max connections.
 # if exceed the max connections, server will drop the new connection.

@@ -1282,7 +1282,7 @@ string SrsConfig::get_srs_log_file()
     
     SrsConfDirective* conf = root->get("srs_log_file");
     if (!conf || conf->arg0().empty()) {
-        return "";
+        return "./objs/srs.log";
     }
     
     return conf->arg0();
@@ -1293,11 +1293,11 @@ bool SrsConfig::get_srs_log_tank_file()
     srs_assert(root);
     
     SrsConfDirective* conf = root->get("srs_log_tank");
-    if (conf && conf->arg0() == "file") {
-        return true;
+    if (conf && conf->arg0() == "console") {
+        return false;
     }
     
-    return false;
+    return true;
 }
 
 bool SrsConfig::get_deamon()

@@ -61,6 +61,10 @@ int run_master()
     signal(SIGTERM, handler);
     signal(SIGINT, handler);
     
+    if ((ret = _srs_server->acquire_pid_file()) != ERROR_SUCCESS) {
+        return ret;
+    }
+    
     if ((ret = _srs_server->initialize_st()) != ERROR_SUCCESS) {
         return ret;
     }
@@ -161,9 +165,5 @@ int main(int argc, char** argv)
         return ret;
     }
     
-    if ((ret = _srs_server->acquire_pid_file()) != ERROR_SUCCESS) {
-        return ret;
-    }
-    
     return run();
 }