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From Chen Chien-Yu <honer...@gmail.com>
Subject Re: [users@httpd] HTTP doesn't work after upgrading from 2.0.55 to 2.2.15
Date Fri, 28 May 2010 06:56:02 GMT
Hi Nick,

I have no idea why duplicate the stdout, and seems that no one deals with
the stream closing in the library.
Please have a look at the main source code,
http://www.sfr-fresh.com/unix/www/gcgi-0.9.5.tar.gz:a/libgcgi.a-0.9.5/src/gcgi.c

I guess this is the official website of this library, no activities since
2002. http://freshmeat.net/projects/gcgi/
Doubt that I would get response from them..

My CGI looks like this roughly.. (only the main structure and skip the
non-related parts)

main() {

  if(initCgi() != GCGISUCCESS) {
    return -1;
  }

  if ((fs = fopen ("login.html", "r")) == NULL) {
    return -2;
  }

  while ((c = getc (fs)) != EOF) {
    .
    putchar(c);
    .
  }

  fclose(fs);
  freeCgi();

  return 0;
}

This is the example code the developers provided. I use almost the same code
flow as theirs.
http://www.sfr-fresh.com/unix/www/gcgi-0.9.5.tar.gz:a/libgcgi.a-0.9.5/examples/gcgiFileUploadTest.c

Thanks

Best regards,
honercek

On Fri, May 28, 2010 at 2:17 PM, Nick Kew <nick@webthing.com> wrote:

>
> On 28 May 2010, at 06:23, Chen Chien-Yu wrote:
>
> > Hi William,
> >
> > I reckon it should be mod_cgi, the CGI library I use is called "GNU CGI
> Library in C, v0.9.5" which has been maintained for many years.
> >
> > The function below is the way the CGI init and open the stream.
> >
> > gcgiReturnType
> > initCgi( )
> > {
> >     /* Dup stdout to gcgiOut */
> >     gcgifd = dup(fileno(stdout));
> >     gcgiOut = fdopen(gcgifd, "w");
>
> Huh?  Why dup stdout?  And who manages closing it?
>
> > Then, free the resource but I didn't see it close the file descriptor. It
> duplicate the standard output, is that the reason that don't have to close
> it? I've tried to close the stdout, stderr, gcgiOut, stdin, but that didn't
> work.
>
> You should be able (but not normally required) to close your file
> descriptors in CGI.
> But the dup introduced unexpected complexity.
>
> If all that's from the cgi lib you're using, maybe you should put it to the
> maintainers of that,
> and perhaps try and post somewhere a minimal CGI program that demonstrates
> your problem.
>
> --
> Nick Kew
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