[Aggregator] Fix config parsing memory leaks

Same thing as for the Listener: avoid using exit(), prefer return an int
value instead.

owlps-aggregator/owlps-aggregator.h

@@ -86,10 +86,10 @@ typedef struct _ap_list
 
 
 /* Function headers */
-void initialise_configuration(int argc, char **argv) ;
-void parse_config_file(int argc, char **argv) ;
-void parse_command_line(int argc, char **argv) ;
-void check_configuration(void) ;
+int initialise_configuration(int argc, char **argv) ;
+int parse_config_file(int argc, char **argv) ;
+int parse_command_line(int argc, char **argv) ;
+int check_configuration(void) ;
 
 int read_loop(int sockfd) ;
 void got_request(owl_captured_request request) ;

owlps-aggregator/owlps-aggregatord.c

@@ -42,10 +42,14 @@ int main(int argc, char **argv)
     monitor_aps_thread, // APs monitoring thread
     autocalibration_hello_thread ; // Hello messages reception thread
   uint_fast16_t listening_port ;
-  int sockfd ; // UDP listening socket
+  int sockfd = -1 ; // UDP listening socket
+
+  owl_run = owl_true ;
 
   program_name = argv[0] ;
-  initialise_configuration(argc, argv) ;
+  ret = initialise_configuration(argc, argv) ;
+  if (! owl_run)
+    goto exit ;
 
   /* Set up signal handlers */
   action.sa_flags = 0 ;
@@ -98,7 +102,6 @@ int main(int argc, char **argv)
         }
     }
 
-  owl_run = owl_true ;
   ret = read_loop(sockfd) ;
 
   /* Wait for the threads to terminate */
@@ -140,7 +143,8 @@ int main(int argc, char **argv)
 
   /* Last cleaning tasks */
  exit:
-  close(sockfd) ; // Close socket
+  if (sockfd >= 0)
+    close(sockfd) ; // Close socket
   free_request_list() ;
   free_ap_list() ;
   cfg_free(cfg) ; // Clean configuration
@@ -154,11 +158,28 @@ int main(int argc, char **argv)
 
 
 
-void initialise_configuration(int argc, char **argv)
+/*
+ * Read the configuration from both the command line and the
+ * configuration file.
+ * Returns an error code, or 0 in case of success. If the program should
+ * stop (because of a special option or a configuration error), owl_run
+ * is set to false.
+ */
+int initialise_configuration(int argc, char **argv)
 {
-  parse_config_file(argc, argv) ;
-  parse_command_line(argc, argv) ;
-  check_configuration() ;
+  int ret ;
+
+  ret = parse_config_file(argc, argv) ;
+  if (! owl_run)
+    return ret ;
+
+  ret = parse_command_line(argc, argv) ;
+  if (! owl_run)
+    return ret ;
+
+  ret = check_configuration() ;
+  if (! owl_run)
+    return ret ;
 
   /* Configuration printing */
   if (VERBOSE_INFO)
@@ -166,10 +187,12 @@ void initialise_configuration(int argc, char **argv)
       fprintf(stderr, "Configuration:\n") ;
       cfg_print(cfg, stderr) ;
     }
+
+  return 0 ;
 }
 
 
-void parse_config_file(int argc, char **argv)
+int parse_config_file(int argc, char **argv)
 {
   // Config file options for confuse
   cfg_opt_t opts[] =
@@ -221,10 +244,12 @@ void parse_config_file(int argc, char **argv)
           break ;
         case 'h' :
           print_usage() ;
-          exit(0) ;
+          owl_run = owl_false ;
+          return EXIT_SUCCESS ;
         case 'V' :
           print_version() ;
-          exit(0) ;
+          owl_run = owl_false ;
+          return EXIT_SUCCESS ;
         }
     }
 
@@ -250,13 +275,16 @@ void parse_config_file(int argc, char **argv)
               "Error! Parsing of configuration file « %s » failed!\n",
               config_file) ;
       free(config_file) ;
-      exit(ERR_PARSING_CONFIG_FILE) ;
+      owl_run = owl_false ;
+      return ERR_PARSING_CONFIG_FILE ;
     }
   free(config_file) ;
+
+  return 0 ;
 }
 
 
-void parse_command_line(int argc, char **argv)
+int parse_command_line(int argc, char **argv)
 {
   int opt ;
 
@@ -281,9 +309,6 @@ void parse_command_line(int argc, char **argv)
           break ;
         case 'f' : // Config file
           break ; // (already parsed)
-        case 'h' :
-          print_usage() ;
-          exit(0) ;
         case 'i' :
           cfg_setstr(cfg, "positioner_ip", optarg) ;
           break ;
@@ -316,20 +341,24 @@ void parse_command_line(int argc, char **argv)
           break ;
         default :
           print_usage() ;
-          exit(ERR_BAD_USAGE) ;
+          owl_run = owl_false ;
+          return ERR_BAD_USAGE ;
         }
     }
+
+  return 0 ;
 }
 
 
-void check_configuration()
+int check_configuration()
 {
   // output_file //
   if (cfg_getstr(cfg, "output_file")[0] == '\0')
     {
       fprintf(stderr, "Error! You must specify an output file.\n") ;
       print_usage() ;
-      exit(ERR_BAD_USAGE) ;
+      owl_run = owl_false ;
+      return ERR_BAD_USAGE ;
     }
 
   // listening_port //
@@ -358,7 +387,8 @@ void check_configuration()
       fprintf(stderr, "Error! You must specify the IP address of the"
               " localisation server.\n") ;
       print_usage() ;
-      exit(ERR_BAD_USAGE) ;
+      owl_run = owl_false ;
+      return ERR_BAD_USAGE ;
     }
 
   // aggregate_timeout //
@@ -405,6 +435,8 @@ void check_configuration()
                 " failing back to the default value.\n") ;
       cfg_setint(cfg, "ap_check_interval", DEFAULT_AP_CHECK_INTERVAL) ;
     }
+
+  return 0 ;
 }