#define file_Sys_Sys_buffer_mode_line_0(self) _IOLBF
#define file_Sys_Sys_buffer_mode_none_0(self) _IONBF
-#define string_NativeString_NativeString_file_mkdir_0(p) (mkdir(p, 0777))
+#define string_NativeString_NativeString_file_mkdir_0(p) (!mkdir(p, 0777))
#define string_NativeString_NativeString_file_getcwd_0(p) (getcwd(NULL, 0))
-#define string_NativeString_NativeString_file_chdir_0(p) (chdir(p)?-1:0) /* hack to avoid warn_unused_result */
+#define string_NativeString_NativeString_file_chdir_0(p) (!chdir(p))
#define file_NativeString_realpath(p) (realpath(p, NULL))
#define file_stdin_poll_in(self) file_stdin_poll_in_()