Re: How to run IOC in docker containers properly

[Heinz Junkes via Tech-talk <tech-talk at aps.anl.gov>]

For my convenience (to be able to access my VMEbus CPUs remotely) I built this into the rtems_init:


*
 ***********************************************************************
 *                         TELNET DAEMON                               *
 ***********************************************************************
 */
#define LINE_SIZE 256
static void
telnet_pseudoIocsh(char *name, void *arg)
{
  char line[LINE_SIZE];
  int fid[3], save_fid[3];

  printf("info:  pty dev name = %s\n", name);

  save_fid[1] = dup2(1,1);
  fid[1] = dup2( fileno(stdout), 1);
  if (fid[1] == -1 ) printf("Can't dup stdout\n");
  save_fid[2] = dup2(2,2);
  fid[2] = dup2( fileno(stderr), 2);
  if (fid[2] == -1 ) printf("Can't dup stderr\n");

  const char *prompt = "tIocSh> ";

  while (1) {
    fputs(prompt, stdout);
    fflush(stdout);
    /* telnet close not detected ??? tbd */
    if (fgets(line, LINE_SIZE, stdin) == NULL) {
      dup2(save_fid[1],1);
+     dup2(save_fid[2],2);
      return;
    }
    if (line[strlen(line)-1] == '\n') line[strlen(line)-1] = 0;
    if (!strncmp( line, "bye",3)) {
      printf( "%s", "Will end session\n");
      dup2(save_fid[1],1);
      dup2(save_fid[2],2);
      return;
     }
     iocshCmd(line);
   }
}


and defined this in the telned_config_table.


Viele Grüße
Heinz Junkes
--
Experience directly varies with equipment ruined.



> On 18. Jun 2020, at 05:06, Michael Davidsaver via Tech-talk <tech-talk at aps.anl.gov> wrote:
> 
> On 6/17/20 4:26 PM, Johnson, Andrew N. via Tech-talk wrote:
>>> While we're at it I would like to propose a forth solution: How about
>>> beefing up the IOC itself so it can listen on a socket for connections
>>> to the IOC shell? This would come with a few advantages (some of them
>>> might only apply to systems running systemd):
>>> 
>>> ...
>>> 
>>> Thoughts? Maybe a project for the upcoming online codeathon?
>> 
>> I think that would be best implemented in an external module. You don’t have to use the iocsh to run your IOCs – you can write your own shell, or set up the stdin/stdout/stderr streams to point to something else before running iocsh() in the main() routine. You might want to disable readline if you do that though unless you are completely emulating a tty.
> 
> Something like this would be functionally similar to the RTEMS telnetd
> created by Till Straumann.  I quite liked that feature.
> 
> I think having the option of a more daemon-like IOC, while preserving
> the feature set of IOC shell, would be an excellent project.  While
> it would probably be best to try this idea as an external module (if
> possible).  I see no reason why this sort of enhancement couldn't be
> included in Base.

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