getpid/kill question

From: Joe Cipale (joec_at_aracnet.com)
Date: 05/09/04 

Date: Sun, 09 May 2004 11:11:34 -0700

I have a application that spawns an xterm window using system(). I only
want the spawned window to be displayed for as long as the user is in a
certain 'location' of the application. Once they exit, then the spawned
window is to be terminated.

This lead me to use the following code snippet:
pid_t pid;

getpid = system("xterm \"Display\" -geom 80x40 &");
cout << "Var check: getpid() = " << getpid << endl;
system("kill -9 getpid");

When I exececute the system call to create the xterm and display the pid
value, the value is '0'. I then go to another window and perform:
%ps -aux | grep xterm | grep Display
 and I get a pid value that != '0'.

I would like to do this as elegantly as possible, without having to
resort to awk/sed within my code. I have the book "Advanced Programming
in the Unix Environment" by Richard Stevens, but I have not quite found
the answer to my task.

Would I be better off using something other than system() that will
generate a 'true' pid? fork() or exec*() perhaps?

TIA,

Joe 

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