<div dir="ltr">text:ports (in the framework) is where the implementation of DrRacket's port is if that helps.<div> </div><div>Robby</div></div><div class="gmail_extra"> <div class="gmail_quote">On Fri, Feb 8, 2013 at 9:08 AM, Jens Axel Søgaard <<a href="mailto:jensaxel@soegaard.net" target="_blank">jensaxel@soegaard.net</a>> wrote: <blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">2013/2/7 Jens Axel Søgaard <<a href="mailto:jensaxel@soegaard.net">jensaxel@soegaard.net</a>>: This is an update: 1. Danny confirms that the bug is repeatable on his machine. 2. Weirdness on first character of the input reminded him on this bug: <a href="http://comments.gmane.org/gmane.comp.lang.racket.user/1759" target="_blank">http://comments.gmane.org/gmane.comp.lang.racket.user/1759</a> 3. Wrapping the call to system* with (parameterize ([current-input-port (open-input-bytes #"abcde\n") …) make the program works expected. The last point imply that the behaviour has something to do with the "buffer ports" that DrRackets sets up to convert from ports used in DrRacket to the file-stream-port need by system*. 4. The equivalent C program (see below) does not trigger the error. #include <stdio.h> int main(int argc, char **argv) { char str[200]; printf("Enter string:\n"); fgets(str, 200, stdin); printf("%s\n",str); return 0; } /Jens Axel <div class="HOEnZb"><div class="h5"> > I am basically calling (system* "fpctest") where > fpctest is the result of compiling this program with fpc: > > program fpctest; > var s:string; > begin > writeln('Enter string:'); > readln(s); > writeln(s); > writeln('hello'); > end. > > The interaction in DrRacket is: > > 1. Input box appears > 2. I enter abcdef > 3. abcdef appears where the input box was displayed. > 4. This error messages is displayed: > .../Racket v5.3.2/collects/racket/private/port.rkt:128:15: > write-bytes-avail: output port is closed > 5. The following is displayed: > Enter string: > bcdef > hello > > There are three things of interest: > 1. The input box appears before "Enter string" is > written to the screen. > (Is this the Pascal program misbehaving?) > 2. The error that points to a private file, which > seems odd. > 3. The a is missing from the output of the > Pascal program. > > Running the program from command line racket > seems to work every time. > > Once in while (say 1 out of 10 times) it works in DrRacket too. > > Any ideas what can explain what I see? > > Images: <a href="http://imgur.com/wSE6De5" target="_blank">http://imgur.com/wSE6De5</a> > <a href="http://imgur.com/hdYJcKx" target="_blank">http://imgur.com/hdYJcKx</a> </div></div><div class="HOEnZb"><div class="h5">____________________ Racket Users list: <a href="http://lists.racket-lang.org/users" target="_blank">http://lists.racket-lang.org/users</a> </div></div></blockquote></div> </div>