What is a process group

[Conor P. Cahill]

In article <1158 at msa3b.UUCP>, kevin at msa3b.UUCP (Kevin P. Kleinfelter) writes:
> I have inherited some code which does
> 	pid = setpgrp ();
> 	ioctl (2, TIOCSPGRP, &pid);
> to change the process group on the terminal.  Why would someone want to
> do this?

The main purpose for changing the process group (and disconnecting from the 
tty -- the ioctl()) is to allow a background/daemon process to continue
running without being affected by operations happening on the tty from 
which the process started.  Like the user loggin out, which will normally 
send a SIGHUP to all processes associated with the terminal.



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