Re: [Sbcl-devel] strange stdout from run-program

[Jan M. <jmo...@te...>]

Hi.

On Wed, 2018-01-10 at 12:10 +0100, Jim Newton wrote:
> (SB-EXT:RUN-PROGRAM "gnuplot"
>                          ("/Users/jnewton/newton.16.edtchs/src/best-
> 2-integer-ranges.gnu")
>                          :SEARCH COMMON-LISP:T :SEARCH COMMON-LISP:T
> :OUTPUT
>                          "/Users/jnewton/newton.16.edtchs/src/best-2-
> integer-ranges.png"
>                          :IF-OUTPUT-EXISTS :SUPERSEDE)

You have to explicitly specify a destination for the error output
stream if you want it to go somewhere different from the value of
:output.

The documentation string says:

    :ERROR and :IF-ERROR-EXISTS
              Same as :OUTPUT and :IF-OUTPUT-EXISTS, except that :ERROR can also be
              specified as :OUTPUT in which case all error output is routed to the
              same place as normal output.

which is not too helpful in this regard.

I quickly tried the following and it worked as expected:

    (sb-ext:run-program "gnuplot" '("/tmp/gnuplot-error.gplt")
                        :search t 
    	                :output "/tmp/gnuplot-test.png" :if-output-exists :supersede
    	                :error *error-output*)

Kind regards,
Jan