+/**
+ * Initialize color mode if necessary.
+ *
+ * \param color_arg The argument given to --color.
+ * \param color_arg_auto The value for automatic color detection.
+ * \param color_arg_no The value to disable colored log messages.
+ * \param logfile_given In auto mode colors are disabled if this value is true.
+ *
+ * If color_arg equals color_arg_no, color mode is disabled. That is, calls to
+ * para_log() will not produce colored output. If color_arg equals
+ * color_arg_auto, the function detects automatically whether to activate
+ * colors. Otherwise color mode is enabled.
+ *
+ * If color mode is to be enabled, the default colors are set for each
+ * loglevel. They can be overwritten by calling daemon_set_log_color_or_die().
+ *
+ * \return Whether colors have been enabled by the function.
+ */
+bool daemon_init_colors_or_die(int color_arg, int color_arg_auto,
+ int color_arg_no, bool logfile_given)
+{
+ if (color_arg == color_arg_no)
+ return false;
+ if (color_arg == color_arg_auto) {
+ if (logfile_given)
+ return false;
+ if (!isatty(STDERR_FILENO))
+ return false;
+ }
+ daemon_set_flag(DF_COLOR_LOG);
+ daemon_set_default_log_colors();
+ return true;
+}
+