Module: LinuxStat::Process

Defined in:
lib/linux_stat/process.rb

Overview

Shows various information about a process that is either running, sleeping, idle or a zombie.

Class Method Summary collapse

Class Method Details

.cmdlines ⇒ Object

Returns all the id of processes mapped with their cmdline info as a Hash. The cmdlines aren’t usually truncated like names, but they can contain arguments with the command.



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# File 'lib/linux_stat/process.rb', line 57

def cmdlines
  h, i = {}, -1

  l = list
  count = l.length

  while(i += 1) < count
    x = l[i]

    begin
      cmdlines = IO.read("/proc/#{x}/cmdline").strip
      cmdlines.gsub!(?\u0000.freeze, ?\s.freeze)
      h.merge!( x => cmdlines)
    rescue StandardError
    end
  end
  h
end

.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 29

def count
  list.length
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 120

def idle
  list.select { |x|
    LinuxStat::ProcFS.ps_state(x) == ?I.freeze
  }
end

.last_pid ⇒ Object

Returns the last_pid of the system. It directly calls LS::ProcFS.last_pid

The return value is Integer, but if the status isn’t available, it will return nil



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# File 'lib/linux_stat/process.rb', line 160

def last_pid
  LinuxStat::ProcFS.last_pid
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 11

def list
  d = Dir['/proc/*'.freeze]
  ret, i = [], -1
  count = d.length

  while(i += 1) < count
    pid = File.split(d[i])[1]
    pid_i = pid.to_i
    ret << pid_i if pid_i.to_s == pid
  end

  ret
end

.names ⇒ Object

Returns all the id of processes mapped with their executable names (comm) as a Hash. The names can be truncated to TASK_COMM_LEN or (16 - 1 = 15) places.



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# File 'lib/linux_stat/process.rb', line 36

def names
  h, i = {}, -1

  l = list
  count = l.length

  while(i += 1) < count
    x = l[i]

    begin
      h.merge!( x => IO.read("/proc/#{x}/comm").strip)
    rescue StandardError
    end
  end
  h
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 138

def running
  list.select { |x|
    LinuxStat::ProcFS.ps_state(x) == ?R.freeze
  }
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 111

def sleeping
  list.select { |x|
    LinuxStat::ProcFS.ps_state(x) == ?S.freeze
  }
end

.stopped ⇒ Object

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



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# File 'lib/linux_stat/process.rb', line 147

def stopped
  list.select { |x|
    v = LinuxStat::ProcFS.ps_state(x)
    v == ?T.freeze || v == ?t.freeze
  }
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 78

def types
  h, i = {}, -1

  l = list
  count = l.length

  while(i += 1) < count
    x = l[i]

    begin
      h.merge!(x =>
        case LinuxStat::ProcFS.ps_state(x)
          when ?S.freeze then :sleeping
          when ?I.freeze then :idle
          when ?Z.freeze then :zombie
          when ?R.freeze then :running
          when ?T.freeze then :stopped
          when ?X.freeze then :dead
          when ?D.freeze then :sleeping
          when ?t.freeze then :stopped
          else :unknown
        end
      )
    rescue StandardError
    end
  end

  h
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 129

def zombie
  list.select { |x|
    LinuxStat::ProcFS.ps_state(x) == ?Z.freeze
  }
end