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Versions: 13
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Stored size: 1.66 KB
Contents
module Loops
module Daemonize
def self.read_pid(pid_file)
File.open(pid_file) do |f|
f.gets.to_i
end
rescue Errno::ENOENT
0
end
def self.check_pid(pid_file)
pid = read_pid(pid_file)
return false if pid.zero?
if defined?(::JRuby)
system "kill -0 #{pid} &> /dev/null"
return $? == 0
else
Process.kill(0, pid)
end
true
rescue Errno::ESRCH, Errno::ECHILD, Errno::EPERM
false
end
def self.create_pid(pid_file)
if File.exist?(pid_file)
puts "Pid file #{pid_file} exists! Checking the process..."
if check_pid(pid_file)
puts "Can't create new pid file because another process is runnig!"
return false
end
puts "Stale pid file! Removing..."
File.delete(pid_file)
end
File.open(pid_file, 'w') do |f|
f.puts(Process.pid)
end
return true
end
def self.daemonize(app_name)
if defined?(::JRuby)
puts "WARNING: daemonize method is not implemented for JRuby (yet), please consider using nohup."
return
end
fork && exit # Fork and exit from the parent
# Detach from the controlling terminal
unless sess_id = Process.setsid
raise Daemons.RuntimeException.new('cannot detach from controlling terminal')
end
# Prevent the possibility of acquiring a controlling terminal
trap 'SIGHUP', 'IGNORE'
exit if pid = fork
$0 = app_name if app_name
Dir.chdir(Loops.root) # Make sure we're in the working directory
File.umask(0000) # Insure sensible umask
return sess_id
end
end
end
Version data entries
13 entries across 13 versions & 2 rubygems