
errorp(3)             LPC 系统函数             errorp(3)

名称
     errorp() - determine whether or not a given variable  is  an
     error code

语法
     int errorp( mixed arg );

描述
     Returns 1 if `arg' is an integer that is an error code.

     Eventually efuns will be modified to return  standard  error
     codes so that code like this will be possible:

          if (errorp(result = efun_call()))
              printf("error = %d\n", result);

     In future, there will  also  be  a  perror(result)  efun  to
     return  error  string  that  goes  with  a  particular error
     integer.

请参考
     nullp(3), undefinedp(3)

MudOS                Last change: 5 Sep 1994                    1

