Module: LinuxStat::Process

Defined in:
lib/linux_stat/process.rb

Class Method Summary collapse

Class Method Details

.count ⇒ Object

Counts and returns the total number of process running on the system.

The return type is Integer.



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# File 'lib/linux_stat/process.rb', line 19

def count
  list.count
end

.idle ⇒ Object

Returns all the id of processes that are idle. The return type is an Array of Integers.



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# File 'lib/linux_stat/process.rb', line 71

def idle
  list.select { |x|
    begin
      IO.read(File.join('/proc', x.to_s, 'stat')).split[2] == ?I
    rescue Exception
      nil
    end
  }
end

.list ⇒ Object

Returns the list of processes from /proc/.

The return type is an Array of Integers.



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# File 'lib/linux_stat/process.rb', line 8

def list
  Dir['/proc/*'].select! { |x|
    pid = File.split(x)[1]
    pid.to_i.to_s == pid
  }.map! { |x| File.split(x)[-1].to_i }
end

.names ⇒ Object

Returns all the id of processes mapped with their names as a Hash.



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# File 'lib/linux_stat/process.rb', line 25

def names
  list.reduce({}) { |h, x|
    begin
      h.merge!( x => IO.foreach(File.join('/proc', x.to_s, 'status')).first.split[1] )
    rescue Exception
      h
    end
  }
end

.running ⇒ Object

Returns all the id of processes that are running. The return type is an Array of Integers.



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# File 'lib/linux_stat/process.rb', line 97

def running
  list.select { |x|
    begin
      IO.read(File.join('/proc', x.to_s, 'stat')).split[2] == ?R
    rescue Exception
      nil
    end
  }
end

.sleeping ⇒ Object

Returns all the id of processes that are sleeping. The return type is an Array of Integers.



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# File 'lib/linux_stat/process.rb', line 58

def sleeping
  list.select { |x|
    begin
      IO.read(File.join('/proc', x.to_s, 'stat')).split[2] == ?S
    rescue Exception
      nil
    end
  }
end

.types ⇒ Object

Returns all the id of processes mapped with their status as a Hash.



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# File 'lib/linux_stat/process.rb', line 37

def types
  list.reduce({}) { |h, x|
    begin
      h.merge!(x =>
        case IO.read(File.join('/proc', x.to_s, 'stat')).split[2]
          when ?S.freeze then :sleeping
          when ?I.freeze then :idle
          when ?Z.freeze then :zombie
          when ?R.freeze then :running
          else :unknown
        end
      )
    rescue Exception
      h
    end
  }
end

.zombie ⇒ Object

Returns all the id of processes that are zombies. The return type is an Array of Integers.



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# File 'lib/linux_stat/process.rb', line 84

def zombie
  list.select { |x|
    begin
      IO.read(File.join('/proc', x.to_s, 'stat')).split[2] == ?Z
    rescue Exception
      nil
    end
  }
end