Process IDs Reserved by System

[Sandeep L R]

Hi All,

Can anyone help me out with answer for this question.

What process ids are generally reserved by Opearting system?

TIA

Sandeep

[John Poff]

Hi,

The swapper process will get PID 0, and init will get PID 1.

JP

[Sandeep L R]

Thanks!!

Is there any other restriction on other process ids like OS will reserve some process ids for its internal purpose. Does this mean applications can take any pid except 0 and 1, if its available?

[A. Clay Stephenson]

When answering for generic UNIX, there are really only 2. PID 0 -- swapper; PID 1 --- init. Various flavors of UNIX have a few more.

One way to probe this for your particular case, is a simple ps -p N where N might range for 0 to 10.