how to bind a app to a user when it connect the server with a terminal

My app now has been sealed as a product, which will be sold with a PC with linux system installed. How ever I will create a new user for the customers开发者_运维百科, but I want bind a interface-like app to the user, so when my custumers log in via terminals the selected app runs automatically, when connection ends, the app quit the same way. I know , maybe this can be implemented programmally..but... Do you know any suggestion??? thanx all appreciated...

As mentioned by AProgrammer you can run your app as the user shell or in the profile, as in this example

# ~/.profile: executed by the command interpreter for login shells.
# This file is not read by bash(1), if ~/.bash_profile or ~/.bash_login
# exists.
# see /usr/share/doc/bash/examples/startup-files for examples.
# the files are located in the bash-doc package.

# the default umask is set in /etc/profile; for setting the umask
# for ssh logins, install and configure the libpam-umask package.
#umask 022

# if running bash
if [ -n "$BASH_VERSION" ]; then
    # include .bashrc if it exists
    if [ -f "$HOME/.bashrc" ]; then
    . "$HOME/.bashrc"
    fi
fi

# set PATH so it includes user's private bin if it exists
if [ -d "$HOME/bin" ] ; then
    PATH="$HOME/bin:$PATH"
fi

# run you app here
exec myapp

If you have your app started by xinetd then you can have it start up on connect. On disconnect your app will be sent a SIGHUP, so you can catch that and shut down.

The program executed by terminal login is the user shell as determined by a field in /etc/passwd. You could either put your program as the shell, or arrange for you program to be executed by the shell start up scripts (~/.profile, ~/.cshrc depending on the shell).