Linux process

Linux Process States

Linux process are execute much like real
life. They are born, share resources with parents, get own copy of resources when ready to make changes, execute
through various states depending upon their priority and then finally
die.Various states of Linux processes
:

• RUNNING – This state specifies that the process is either in execution or waiting to get executed.
• INTERRUPTIBLE – This state specifies that the process is waiting to
  get interrupted as it is in sleep mode and waiting for some action to
  happen that can wake this process up. The action can be a hardware
  interrupt, signal etc.
• UN-INTERRUPTIBLE – It is just like the INTERRUPTIBLE state, the only
  difference being that a process in this state cannot be waken up by
  delivering a signal.
• STOPPED – This state specifies that the process has been stopped.
  This may happen if a signal like SIGSTOP, SIGTTIN etc is delivered to
  the process.
• TRACED – This state specifies that the process is being debugged.
  Whenever the process is stopped by debugger (to help user debug the
  code) the process enters this state.
• ZOMBIE – This state specifies that the process is terminated but
  still hanging around in kernel process table because the parent of this
  process has still not fetched the termination status of this process.
  Parent uses wait() family of functions to fetch the termination status.
• DEAD – This state specifies that the process is terminated and entry
  is removed from process table. This state is achieved when the parent
  successfully fetches the termination status as explained in ZOMBIE
  state.