How to close gnome terminal screen from program in C

Question

I am writing server and client socket program .

The server manages connections between clients.

When client wants to chat with another I open new terminal screen using :

              char command[MAXBUFSIZE];
              strcpy(command,"gnome-terminal -e './client ");
              strcat(command,client.url);
              strcat(command," ");
              strcat(command,client.port);
              strcat(command," '");
              system(command);

Is there any way to know from this block the number of process which have this new terminal.

Because I want to try something like this: When client wants to chat with another friend he tells the server and automatically the terminal with the last one close .

So I have to write here command which kill the process that open last terminal chat screen.

Answer 1

Is there any way to know from this block the number of process which have this new terminal.

No; replace it with:

    char command[MAXBUFSIZE];
    sprintf(command, "./client %s %s", client.url, client.port);
    pid_t pid = fork();
    switch (pid)
    {   int status;
    case -1:    perror("fork");
                break;
    case 0:     execlp("gnome-terminal", "gnome-terminal", "-e", command, NULL);
                perror("exec");
                exit(1);
    default:    // You may kill the new terminal process "pid", as you wish.
                // wait(&status); if you want to.
    }