Question about controlling processes

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2 total messages Started by Sivarama Subramanian Sat, 23 Jan 1993 18:53

#2605

Author: Sivarama Subramanian
Date: Sat, 23 Jan 1993 18:53

22 lines
1365 bytes

Hi folks,

                                          forks
               forks                   |-------->Process3
   Process1 --------------> Process2-----
                                       |-------->Procees4
                                          forks
I want to make Process2 controlling process and let Process4
      belong to a backgroung process group. When Process2 exits
      Process3 should get SIGHUP signal. I want to test this
      scenerio.

Can anyone give me some insights?


1). What is a controlling process?
         My understanding is that the controlling process is the one
         which establishes the connection to the controlling terminal.
         Is it correct and if so how to make a connection to
         controlling terminal?
2) How to make a set of processes belong to foregound and background
    processes?

Re: Question about controlling processes

#2609

Author: Barry Margolin
Date: Mon, 25 Jan 1993 05:11

17 lines
1050 bytes

In article <C1BLso.220H@austin.ibm.com> subra@bynar.austin.ibm.com (Sivarama Subramanian) writes:
>1). What is a controlling process?
>2) How to make a set of processes belong to foregound and background
>    processes?

I haven't heard the term "controlling process".  There's a "controlling
terminal", and a process can be a "session leader" or "process group
leader", and these are related.

This stuff is described in great detail in the book "Advanced Programming
in the Unix Environment" by W. Richard Stevens.

-- 
Barry Margolin
System Manager, Thinking Machines Corp.

barmar@think.com          {uunet,harvard}!think!barmar

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