Class: CzSystemInfo::Uptime

Inherits:
Object
  • Object
show all
Extended by:
FFI::Library
Defined in:
lib/cz_system_info/uptime.rb

Overview

The Uptime class encapsulates various bits of information regarding your system’s uptime, including boot time.

Defined Under Namespace

Classes: Error

Class Method Summary collapse

Class Method Details

.boot_time ⇒ Object

Returns a Time object indicating the time the system was last booted.

Example:

CzSystemInfo::Uptime.boot_time # => Mon Jul 13 06:08:25 -0600 2009



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# File 'lib/cz_system_info/uptime.rb', line 102

def self.boot_time
  if RbConfig::CONFIG['host_os'] =~ /linux/i
    Time.now - seconds
  elsif respond_to?(:sysctl, true)
    tv = Timeval.new
    mib  = FFI::MemoryPointer.new(:int, 2).write_array_of_int([CTL_KERN, KERN_BOOTTIME])
    size = FFI::MemoryPointer.new(:long, 1).write_int(tv.size)

    if sysctl(mib, 2, tv, size, nil, 0) != 0
      raise SystemCallError, "sysctl function failed: #{strerror(FFI.errno)}"
    end

    Time.at(tv[:tv_sec], tv[:tv_usec])
  else
    begin
      setutxent()
      while ent = Utmpx.new(getutxent())
        if ent[:ut_type] == BOOT_TIME
          time = Time.at(ent[:ut_tv][:tv_sec], ent[:ut_tv][:tv_usec])
          break
        end
      end
    ensure
      endutxent()
    end
    time
  end
end

.days ⇒ Object

Returns the total number of days of uptime.

Example:

CzSystemInfo::Uptime.days # => 2



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# File 'lib/cz_system_info/uptime.rb', line 188

def self.days
  seconds / 86400
end

.dhms ⇒ Object

Returns the uptime as a four element array, including days, hours, minutes and seconds.

Example:

CzSystemInfo::Uptime.dhms # => [1,9,24,57]



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# File 'lib/cz_system_info/uptime.rb', line 218

def self.dhms
  uptime.split(':')
end

.hours ⇒ Object

Returns the total number of hours of uptime.

Example:

CzSystemInfo::Uptime.hours # => 31



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# File 'lib/cz_system_info/uptime.rb', line 178

def self.hours
  seconds / 3600
end

.minutes ⇒ Object

Returns the total number of minutes of uptime.

Example:

CzSystemInfo::Uptime.minutes # => 678



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# File 'lib/cz_system_info/uptime.rb', line 168

def self.minutes
  seconds / 60
end

.seconds ⇒ Object

Returns the total number of seconds of uptime.

Example:

CzSystemInfo::Uptime.seconds => 118800



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# File 'lib/cz_system_info/uptime.rb', line 137

def self.seconds
  if RbConfig::CONFIG['host_os'] =~ /linux/i
    # rubocop:disable Lint/RescueException
    begin
      File.read('/proc/uptime').split.first.to_i
    rescue Exception => err
      raise Error, err
    end
    # rubocop:enable Lint/RescueException
  elsif respond_to?(:sysctl, true)
    tv   = Timeval.new
    mib  = FFI::MemoryPointer.new(:int, 2).write_array_of_int([CTL_KERN, KERN_BOOTTIME])
    size = FFI::MemoryPointer.new(:long, 1).write_int(tv.size)

    if sysctl(mib, 2, tv, size, nil, 0) != 0
      raise SystemCallError, "sysctl function failed: #{strerror(FFI.errno)}"
    end

    time(nil) - tv[:tv_sec]
  else
    tms = Tms.new
    times(tms) / TICKS
  end
end

.uptime ⇒ Object

Returns the uptime as a colon separated string, including days, hours, minutes and seconds.

Example:

CzSystemInfo::Uptime.uptime # => "1:9:24:57"



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# File 'lib/cz_system_info/uptime.rb', line 199

def self.uptime
  secs  = seconds
  days  = secs / 86400
  secs -= days * 86400
  hours = secs / 3600
  secs -= hours * 3600
  mins = secs / 60
  secs -= mins * 60

  "#{days}:#{hours}:#{mins}:#{secs}"
end