errorp

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

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          int errorp( mixed arg );

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          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.

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          nullp(3), undefinedp(3)

     Page 1                                          (printed 3/16/95)