class Process::Daemon::ProcessFile
This module controls the storage and retrieval of process id files.
Public Class Methods
cleanup(daemon)
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Remove the pid file if the daemon is not running
# File lib/process/daemon/process_file.rb, line 56 def self.cleanup(daemon) clear(daemon) unless running(daemon) end
clear(daemon)
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Removes the pid saved for a particular daemon
# File lib/process/daemon/process_file.rb, line 38 def self.clear(daemon) if File.exist? daemon.process_file_path FileUtils.rm(daemon.process_file_path) end end
recall(daemon)
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Retrieves the pid for the given daemon
# File lib/process/daemon/process_file.rb, line 33 def self.recall(daemon) File.read(daemon.process_file_path).to_i rescue nil end
running(daemon)
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Checks whether the daemon is running by checking the saved pid and checking the corresponding process
# File lib/process/daemon/process_file.rb, line 45 def self.running(daemon) pid = recall(daemon) return false if pid == nil gpid = Process.getpgid(pid) rescue nil return gpid != nil ? true : false end
status(daemon)
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This function returns the status of the daemon. This can be one of :running
, :unknown
(pid file exists but no corresponding process can be found) or :stopped
.
# File lib/process/daemon/process_file.rb, line 62 def self.status(daemon) if File.exist? daemon.process_file_path return ProcessFile.running(daemon) ? :running : :unknown else return :stopped end end
store(daemon, pid)
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Saves the pid for the given daemon
# File lib/process/daemon/process_file.rb, line 28 def self.store(daemon, pid) File.write(daemon.process_file_path, pid) end