executing a program in new terminal?

kashifbilal · 04-13-2004, 11:41 PM

Hi !!

Its my first question and mail on this forum .
Actually i m developing an application in which , when application runs , it forks 4 childs, i want to display a new terminal for each child process and execute a program using execl(), pleas tell me how can i execute a terminal(bash) from my application

thanks

kashif bilal

itsme86 · 04-14-2004, 12:00 AM

First of all, welcome to LQ!

I'm not exactly sure what you're trying to do here. If you want to just start bash from a program than you can use one of the exec() family of functions to run /bin/bash.

However, if you're trying to open a new terminal window under X then you'd use one of the exec() family of functions to call your terminal application (i.e. xterm, konsole, etc.)

If you just want to run 4 different commands then opening a new shell (bash) is quite unnecessary. But if you want to open 4 new terminal windows and then have 1 command run in each then you can use popen() to run xterm/konsole/whatever and then send your command to the pointer that popen() returned. Something like this:

Code:

int main(void)
{
  FILE *term;
  int i;

  for(i = 0;i < 4;+=i)
  {
    term = popen("/usr/X11R6/bin/xterm", "w");
    fprintf(term, "mycommand\n");
    pclose(term);
  }
}

I think that would work anyway. I don't have access to a linux box at the moment

If I didn't answer your question just leave some more detail on what you're trying to accomplish.

kashifbilal · 04-19-2004, 02:35 AM

Hi Its me !

Thanks for ur reply

U have said

However, if you're trying to open a new terminal window under X then you'd use one of the exec() family of functions to call your terminal application (i.e. xterm, konsole, etc.)

Actually I am developing a router software

My application first detects all interfaces ( NICs ) attached to system and then starts a packet capturing engine for all interaces.

So that to run a packet capturing engine , i want to run each one in different x window terminal. I think now u can understand what i want

thanks
kashif

Tinkster · 04-19-2004, 02:55 AM

Actually I can't understand why one would want to
develop a router that requires to be running within
an X environment...

Cheers,
Tink

kashifbilal · 04-21-2004, 03:47 AM

Hi ! Actually i have not worked much in Linux,
we have used linuc GUI , and developed our application in C .

Now i want to run each process in different trminal , bcaz when i runall processes in one terminal , time is not given to all processes concurretly ,and one can se that which process is executing at this time and all other processes running in that terminal remains idle, so thats why i want torun each process in different terminal ,
just tyell methat how can i execute a new terminal from y program and run a seperate process in it
thanks

kashif

itsme86 · 04-21-2004, 08:36 AM

You can try this:

Code:

int main(void)
{
  FILE *fp[4];
  pid_t pids[4];
  int i;

  for(i = 0;i < 4;++i)
  {
    if((pids[i] = fork()))
    {
      fp[i] = popen("/bin/X11R6/xterm", "w");
      fprintf(fp[i], "command_to_run options\n");
    }
  }

  for(i = 0;i < 4;++i)
     waitpid(pids[i], NULL, 0);

  return 0;
}

I think that might work anyway

Tinkster · 04-21-2004, 02:28 PM

Well, as I said, I wouldn't want a networking product to
depend on X.

The linux way would be to spawn a sub-process and
redirect its output to a FIFO, for instance, and then
your processes run concurrently, and you can check
their output by reading their FIFOs.

Cheers,
Tink

kashifbilal · 04-26-2004, 04:52 AM

Thanks a lot for ur help and code brother

kashif