Module: RExec::Daemon::ProcessFile

Defined in:
lib/rexec/daemon/process_file.rb

Overview

This module controls the storage and retrieval of process id files.

Class Method Summary collapse

Class Method Details

.cleanup(daemon) ⇒ Object

Remove the pid file if the daemon is not running



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# File 'lib/rexec/daemon/process_file.rb', line 54

def self.cleanup(daemon)
	clear(daemon) unless running(daemon)
end

.clear(daemon) ⇒ Object

Removes the pid saved for a particular daemon



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# File 'lib/rexec/daemon/process_file.rb', line 36

def self.clear(daemon)
	if File.exist? daemon.process_file_path
		FileUtils.rm(daemon.process_file_path)
	end
end

.recall(daemon) ⇒ Object

Retrieves the pid for the given daemon



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# File 'lib/rexec/daemon/process_file.rb', line 31

def self.recall(daemon)
	IO.read(daemon.process_file_path).to_i rescue nil
end

.running(daemon) ⇒ Object

Checks whether the daemon is running by checking the saved pid and checking the corresponding process



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# File 'lib/rexec/daemon/process_file.rb', line 43

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) ⇒ Object

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.



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# File 'lib/rexec/daemon/process_file.rb', line 60

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) ⇒ Object

Saves the pid for the given daemon



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# File 'lib/rexec/daemon/process_file.rb', line 26

def self.store(daemon, pid)
	File.open(daemon.process_file_path, 'w') {|f| f << pid}
end