Re: Daemons - Using the process class?

[Wolfgang Alper]

Hello,

Sorry, i just realized that the following is obviously wrong:
> but this cannot work as it is defined as follows:
> void  Process::detach(void) { attach("/dev/null"); }

This calls attach with "dev/null". 

Anyway, i still do not get it to work so any help is apprecicated.

Example:
main() {
  cout << "before creating the daemon" <<  endl;
  // ? how to setup the parent to wait (or not) for the child?
  // cannot use detach because it would close all handles of the child.
  Process::attach("what goes here?");
  If ("what goes here?") {
    char buffer[32];
    cout << "i am the child" << endl;
    cin.getline(buffer, sizeof(buffer));
    cout << "Child: You entered:" << buffer << "\nDone:" << endl;  
    exit(0);
  } else {
    cout << "i am the parent - Done" << endl;           
    exit(0);
  }
}

Regards 

Wolfgang 


Am Mittwoch, 9. Mai 2007 17:21 schrieb Wolfgang Alper:
> Hello,
> I am using commoncpp2-1.5.6 under linux.
> I tried using the process class but it seems i miss a piece.
> Basicallyl i would like to create a daemon (using linux) based on fork.
> i thought i would have to call: Process::detach();
> From the docs
> "Detach current process into a daemon, posix only. Perhaps a similar method
> can be used for creating win32 "services"?"
>
> but this cannot work as it is defined as follows:
> void  Process::detach(void) { attach("/dev/null"); }
>
> So it seems that :
> void Process::attach (const char * devname )
> "Attach the current process to another device or i/o session. It is
> deamonified and dissasociated with the prior parent process and controlling
> terminal."
> is the better choice.
>
> But i still do not get it to work.
> -What to pass as devname?
> -How do it get the PID to know wether i am the child or parent?
> -How can i pass parameter (like waitpid) to decide wether the parent wants
> to wait for the child or not?
>
> I am sure i missunderstood something, so if anyone could give an example on
> how to use this class, this would be great.
>
> Thanks
>
> Wolfgang
>
>
>
>
>
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