I am reframing my question:
Sub-task 1: Until now, parent process cannot control the pid of the forked
child. A pid gets assigned as a sequential number by the kernel at the time
the process is forked . I want to modify kernel in such a way that parent
process can control the pid of the forked child.

Sub-task 2: On Linux, you can find the maximum PID value for your system
with the following command:

$ cat /proc/sys/kernel/pid_max

Suppose pid_max=2000 for a system. I want that the parent process should be
able to assign a pid which is greater that 2000 to the forked child.

On Mon, Mar 21, 2016 at 12:03 AM, [off-list ref] wrote:

On Sun, 20 Mar 2016 02:07:29 -0700, Nitin Varyani said:

quoted

     The linux kernel attaches a pid to newly forked process. I want to
create a facility by which a process has the option of attaching a new

pid

quoted

to its child which is not in the pid space.

Not at all sure what you mean by "not in the pid space", or what you're
trying to achieve by doing it.

But "pid namespaces" may be what you're looking for.

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