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November 4, 2024 15:39
Adljack starts itself in a terminal application. The terminal application obtains the same pid as is started by the NSM daemon. This is the pid the NSM Daemon 'owns'. To announce with the same pid as the process started by the NSM daemon, it's needed to use getppid (get parent pid), this is the pid of the terminal, whereas getpid gets us the pid of adljack.
When under NSM session management, a NSM clients needs to exite when it gets a SIGTERM signal from the NSM daemon. The case of adljack is a special one, as it launches itself in a terminal application. To match the pid process of the NSM daemon when it starts adljack, the pid of the terminal application is send (parent pid). So the terminal applications get the SIGTERM signal from the NSM daemon. SIGHUP is a signal sent to a process when its controlled terminal is closed. So by adding SIGHUP to the catched signals, adljack exites when the terminal application adljack is launched in, gets a SIGTERM signal.
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This a way to match the pid send from adljack to that of the process started by the NSM daemon.
It sends the parent pid (the pid of the terminal adljack is launched in) and let's adljack exite by catching SIGHUP when the terminal application gets SIGTERM from the NSM daemon.
Adljack still works this way in NSM. You might want to test it yourself to first.
See: #28