class Daemons::Pid
Public Class Methods
Source
# File lib/daemons/pid.rb, line 32 def self.dir(dir_mode, dir, script) # nil script parameter is allowed as long as dir_mode is not :script return nil if dir_mode == :script && script.nil? case dir_mode when :normal return File.expand_path(dir) when :script return File.expand_path(File.join(File.dirname(script), dir)) when :system return '/var/run' else fail Error.new("pid file mode '#{dir_mode}' not implemented") end end
Returns the directory that should be used to write the pid file to depending on the given mode.
Some modes may require an additionaly hint, others may determine the directory automatically.
If no valid directory is found, returns nil.
Source
# File lib/daemons/pid.rb, line 5 def self.running?(pid) return false unless pid # Check if process is in existence # The simplest way to do this is to send signal '0' # (which is a single system call) that doesn't actually # send a signal begin Process.kill(0, pid) return true rescue TimeoutError raise rescue Errno::ESRCH return false rescue ::Exception # for example on EPERM (process exists but does not belong to us) return true end end
Public Instance Methods
Source
# File lib/daemons/pid.rb, line 61 def running? Pid.running?(pid) end
Check whether the process is running