[ts-7000] Re: adc_logger from apache

["j.chitte" <>]

--- In  Jim Jackson <> wrote:

> Ah I knew you'd ask that, and my grey cells are failing.
> One of seteuid(), setresuid(), or setuid(), after of course having 
done
> a suitable get*uid to get your real uid.
> 
> from one of my programs dated 1996
> 
> /* get this process's uid, gid and euid..... */
> 
>     uid=getuid(); euid=geteuid(); gid=getgid();
> 
>     if (seteuid(euid)) exit(errno);
> 
> /* do stuff needing root */
> 
>     if (seteuid(uid)) exit(errno); /* turn off the setuid */
> 
> etc
> 
> > Once I have requested the IO memory , do I still need to have root
> > access to read adc channels as in your orignal adc_logger ?
> >
> > That's the only process that will remain running more than one
> > second. The other IO is pretty short lived and terminates straight
> > away.
>

Thanks once again for your help.

I have all this doing pretty much what I need but one key issue is 
holding me back.

I need to run adc_logger (NG) for continuous sampling as a backgroud 
task and return directly to the browser interface. 

if I run a command like this from apache/cgi-bin it works as expected
 ./adc_logger -o ../htdocs/data/adc.data -c 0 -p 500 -f 3 -r 3 -m 1 -
T 1,3 2,3 3,3 4,3 &

but if I call it from my CGI I get all the response page back but the 
browser keeps the eggtimer going until I kill the logger process.

      if (( resp=system(strcat(cmd," &")) )) {  // run in background
        printf("<H3>setting ADC controller failed</h3>\n");
        exit(err_rpt(resp,cmd));
      } else
        printf("<H3>ADC command OK</h3>\n");
 
  printf("</BODY></HTML>\n\n");
   fflush(stdout);
  exit (0);
}  /* end main */


I have an identical problem calling gnuplot in a simliar fashion. All 
calls not run with & work as expected.

I don't see why the browser does not see the responce as completed, 
if I press the stop button and view the source all is there. It just 
seems to be awaiting something. This is odd because the call to 
system() is complete, I get the result of the following printf() and 
adc_logger should be exited already.

Can anyone see what is holding the browser back?

TIA.




 
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