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3acb0d5 Mar 23, 2017
@jeremyevans @bleach @ewdurbin @bpo
869 lines (774 sloc) 28 KB
# -*- encoding: binary -*-
# This is the process manager of Unicorn. This manages worker
# processes which in turn handle the I/O and application process.
# Listener sockets are started in the master process and shared with
# forked worker children.
#
# Users do not need to know the internals of this class, but reading the
# {source}[https://bogomips.org/unicorn.git/tree/lib/unicorn/http_server.rb]
# is education for programmers wishing to learn how unicorn works.
# See Unicorn::Configurator for information on how to configure unicorn.
class Unicorn::HttpServer
# :stopdoc:
attr_accessor :app, :timeout, :worker_processes,
:before_fork, :after_fork, :before_exec,
:listener_opts, :preload_app,
:orig_app, :config, :ready_pipe, :user
attr_writer :after_worker_exit, :after_worker_ready, :worker_exec
attr_reader :pid, :logger
include Unicorn::SocketHelper
include Unicorn::HttpResponse
# all bound listener sockets
# note: this is public used by raindrops, but not recommended for use
# in new projects
LISTENERS = []
# listeners we have yet to bind
NEW_LISTENERS = []
# :startdoc:
# We populate this at startup so we can figure out how to reexecute
# and upgrade the currently running instance of Unicorn
# This Hash is considered a stable interface and changing its contents
# will allow you to switch between different installations of Unicorn
# or even different installations of the same applications without
# downtime. Keys of this constant Hash are described as follows:
#
# * 0 - the path to the unicorn executable
# * :argv - a deep copy of the ARGV array the executable originally saw
# * :cwd - the working directory of the application, this is where
# you originally started Unicorn.
#
# To change your unicorn executable to a different path without downtime,
# you can set the following in your Unicorn config file, HUP and then
# continue with the traditional USR2 + QUIT upgrade steps:
#
# Unicorn::HttpServer::START_CTX[0] = "/home/bofh/2.3.0/bin/unicorn"
START_CTX = {
:argv => ARGV.map(&:dup),
0 => $0.dup,
}
# We favor ENV['PWD'] since it is (usually) symlink aware for Capistrano
# and like systems
START_CTX[:cwd] = begin
a = File.stat(pwd = ENV['PWD'])
b = File.stat(Dir.pwd)
a.ino == b.ino && a.dev == b.dev ? pwd : Dir.pwd
rescue
Dir.pwd
end
# :stopdoc:
# Creates a working server on host:port (strange things happen if
# port isn't a Number). Use HttpServer::run to start the server and
# HttpServer.run.join to join the thread that's processing
# incoming requests on the socket.
def initialize(app, options = {})
@app = app
@request = Unicorn::HttpRequest.new
@reexec_pid = 0
options = options.dup
@ready_pipe = options.delete(:ready_pipe)
@init_listeners = options[:listeners] ? options[:listeners].dup : []
options[:use_defaults] = true
self.config = Unicorn::Configurator.new(options)
self.listener_opts = {}
# We use @self_pipe differently in the master and worker processes:
#
# * The master process never closes or reinitializes this once
# initialized. Signal handlers in the master process will write to
# it to wake up the master from IO.select in exactly the same manner
# djb describes in http://cr.yp.to/docs/selfpipe.html
#
# * The workers immediately close the pipe they inherit. See the
# Unicorn::Worker class for the pipe workers use.
@self_pipe = []
@workers = {} # hash maps PIDs to Workers
@sig_queue = [] # signal queue used for self-piping
@pid = nil
# we try inheriting listeners first, so we bind them later.
# we don't write the pid file until we've bound listeners in case
# unicorn was started twice by mistake. Even though our #pid= method
# checks for stale/existing pid files, race conditions are still
# possible (and difficult/non-portable to avoid) and can be likely
# to clobber the pid if the second start was in quick succession
# after the first, so we rely on the listener binding to fail in
# that case. Some tests (in and outside of this source tree) and
# monitoring tools may also rely on pid files existing before we
# attempt to connect to the listener(s)
config.commit!(self, :skip => [:listeners, :pid])
@orig_app = app
# list of signals we care about and trap in master.
@queue_sigs = [
:WINCH, :QUIT, :INT, :TERM, :USR1, :USR2, :HUP, :TTIN, :TTOU ]
@worker_data = if worker_data = ENV['UNICORN_WORKER']
worker_data = worker_data.split(',').map!(&:to_i)
worker_data[1] = worker_data.slice!(1..2).map do |i|
Kgio::Pipe.for_fd(i)
end
worker_data
end
end
# Runs the thing. Returns self so you can run join on it
def start
inherit_listeners!
# this pipe is used to wake us up from select(2) in #join when signals
# are trapped. See trap_deferred.
@self_pipe.replace(Unicorn.pipe)
@master_pid = @worker_data ? Process.ppid : $$
# setup signal handlers before writing pid file in case people get
# trigger happy and send signals as soon as the pid file exists.
# Note that signals don't actually get handled until the #join method
@queue_sigs.each { |sig| trap(sig) { @sig_queue << sig; awaken_master } }
trap(:CHLD) { awaken_master }
# write pid early for Mongrel compatibility if we're not inheriting sockets
# This is needed for compatibility some Monit setups at least.
# This unfortunately has the side effect of clobbering valid PID if
# we upgrade and the upgrade breaks during preload_app==true && build_app!
self.pid = config[:pid]
build_app! if preload_app
bind_new_listeners!
spawn_missing_workers
self
end
# replaces current listener set with +listeners+. This will
# close the socket if it will not exist in the new listener set
def listeners=(listeners)
cur_names, dead_names = [], []
listener_names.each do |name|
if ?/ == name[0]
# mark unlinked sockets as dead so we can rebind them
(File.socket?(name) ? cur_names : dead_names) << name
else
cur_names << name
end
end
set_names = listener_names(listeners)
dead_names.concat(cur_names - set_names).uniq!
LISTENERS.delete_if do |io|
if dead_names.include?(sock_name(io))
(io.close rescue nil).nil? # true
else
set_server_sockopt(io, listener_opts[sock_name(io)])
false
end
end
(set_names - cur_names).each { |addr| listen(addr) }
end
def stdout_path=(path); redirect_io($stdout, path); end
def stderr_path=(path); redirect_io($stderr, path); end
def logger=(obj)
Unicorn::HttpRequest::DEFAULTS["rack.logger"] = @logger = obj
end
def clobber_pid(path)
unlink_pid_safe(@pid) if @pid
if path
fp = begin
tmp = "#{File.dirname(path)}/#{rand}.#$$"
File.open(tmp, File::RDWR|File::CREAT|File::EXCL, 0644)
rescue Errno::EEXIST
retry
end
fp.syswrite("#$$\n")
File.rename(fp.path, path)
fp.close
end
end
# sets the path for the PID file of the master process
def pid=(path)
if path
if x = valid_pid?(path)
return path if pid && path == pid && x == $$
if x == @reexec_pid && pid.end_with?('.oldbin')
logger.warn("will not set pid=#{path} while reexec-ed "\
"child is running PID:#{x}")
return
end
raise ArgumentError, "Already running on PID:#{x} " \
"(or pid=#{path} is stale)"
end
end
# rename the old pid if possible
if @pid && path
begin
File.rename(@pid, path)
rescue Errno::ENOENT, Errno::EXDEV
# a user may have accidentally removed the original,
# obviously cross-FS renames don't work, either.
clobber_pid(path)
end
else
clobber_pid(path)
end
@pid = path
end
# add a given address to the +listeners+ set, idempotently
# Allows workers to add a private, per-process listener via the
# after_fork hook. Very useful for debugging and testing.
# +:tries+ may be specified as an option for the number of times
# to retry, and +:delay+ may be specified as the time in seconds
# to delay between retries.
# A negative value for +:tries+ indicates the listen will be
# retried indefinitely, this is useful when workers belonging to
# different masters are spawned during a transparent upgrade.
def listen(address, opt = {}.merge(listener_opts[address] || {}))
address = config.expand_addr(address)
return if String === address && listener_names.include?(address)
delay = opt[:delay] || 0.5
tries = opt[:tries] || 5
begin
io = bind_listen(address, opt)
unless Kgio::TCPServer === io || Kgio::UNIXServer === io
io.autoclose = false
io = server_cast(io)
end
logger.info "listening on addr=#{sock_name(io)} fd=#{io.fileno}"
LISTENERS << io
io
rescue Errno::EADDRINUSE => err
logger.error "adding listener failed addr=#{address} (in use)"
raise err if tries == 0
tries -= 1
logger.error "retrying in #{delay} seconds " \
"(#{tries < 0 ? 'infinite' : tries} tries left)"
sleep(delay)
retry
rescue => err
logger.fatal "error adding listener addr=#{address}"
raise err
end
end
# monitors children and receives signals forever
# (or until a termination signal is sent). This handles signals
# one-at-a-time time and we'll happily drop signals in case somebody
# is signalling us too often.
def join
respawn = true
last_check = time_now
proc_name 'master'
logger.info "master process ready" # test_exec.rb relies on this message
if @ready_pipe
begin
@ready_pipe.syswrite($$.to_s)
rescue => e
logger.warn("grandparent died too soon?: #{e.message} (#{e.class})")
end
@ready_pipe = @ready_pipe.close rescue nil
end
begin
reap_all_workers
case @sig_queue.shift
when nil
# avoid murdering workers after our master process (or the
# machine) comes out of suspend/hibernation
if (last_check + @timeout) >= (last_check = time_now)
sleep_time = murder_lazy_workers
else
sleep_time = @timeout/2.0 + 1
@logger.debug("waiting #{sleep_time}s after suspend/hibernation")
end
maintain_worker_count if respawn
master_sleep(sleep_time)
when :QUIT # graceful shutdown
break
when :TERM, :INT # immediate shutdown
stop(false)
break
when :USR1 # rotate logs
logger.info "master reopening logs..."
Unicorn::Util.reopen_logs
logger.info "master done reopening logs"
soft_kill_each_worker(:USR1)
when :USR2 # exec binary, stay alive in case something went wrong
reexec
when :WINCH
if $stdin.tty?
logger.info "SIGWINCH ignored because we're not daemonized"
else
respawn = false
logger.info "gracefully stopping all workers"
soft_kill_each_worker(:QUIT)
self.worker_processes = 0
end
when :TTIN
respawn = true
self.worker_processes += 1
when :TTOU
self.worker_processes -= 1 if self.worker_processes > 0
when :HUP
respawn = true
if config.config_file
load_config!
else # exec binary and exit if there's no config file
logger.info "config_file not present, reexecuting binary"
reexec
end
end
rescue => e
Unicorn.log_error(@logger, "master loop error", e)
end while true
stop # gracefully shutdown all workers on our way out
logger.info "master complete"
unlink_pid_safe(pid) if pid
end
# Terminates all workers, but does not exit master process
def stop(graceful = true)
self.listeners = []
limit = time_now + timeout
until @workers.empty? || time_now > limit
if graceful
soft_kill_each_worker(:QUIT)
else
kill_each_worker(:TERM)
end
sleep(0.1)
reap_all_workers
end
kill_each_worker(:KILL)
end
def rewindable_input
Unicorn::HttpRequest.input_class.method_defined?(:rewind)
end
def rewindable_input=(bool)
Unicorn::HttpRequest.input_class = bool ?
Unicorn::TeeInput : Unicorn::StreamInput
end
def client_body_buffer_size
Unicorn::TeeInput.client_body_buffer_size
end
def client_body_buffer_size=(bytes)
Unicorn::TeeInput.client_body_buffer_size = bytes
end
def check_client_connection
Unicorn::HttpRequest.check_client_connection
end
def check_client_connection=(bool)
Unicorn::HttpRequest.check_client_connection = bool
end
private
# wait for a signal hander to wake us up and then consume the pipe
def master_sleep(sec)
@self_pipe[0].kgio_wait_readable(sec) or return
# 11 bytes is the maximum string length which can be embedded within
# the Ruby itself and not require a separate malloc (on 32-bit MRI 1.9+).
# Most reads are only one byte here and uncommon, so it's not worth a
# persistent buffer, either:
@self_pipe[0].kgio_tryread(11)
end
def awaken_master
return if $$ != @master_pid
@self_pipe[1].kgio_trywrite('.') # wakeup master process from select
end
# reaps all unreaped workers
def reap_all_workers
begin
wpid, status = Process.waitpid2(-1, Process::WNOHANG)
wpid or return
if @reexec_pid == wpid
logger.error "reaped #{status.inspect} exec()-ed"
@reexec_pid = 0
self.pid = pid.chomp('.oldbin') if pid
proc_name 'master'
else
worker = @workers.delete(wpid) and worker.close rescue nil
@after_worker_exit.call(self, worker, status)
end
rescue Errno::ECHILD
break
end while true
end
# reexecutes the START_CTX with a new binary
def reexec
if @reexec_pid > 0
begin
Process.kill(0, @reexec_pid)
logger.error "reexec-ed child already running PID:#@reexec_pid"
return
rescue Errno::ESRCH
@reexec_pid = 0
end
end
if pid
old_pid = "#{pid}.oldbin"
begin
self.pid = old_pid # clear the path for a new pid file
rescue ArgumentError
logger.error "old PID:#{valid_pid?(old_pid)} running with " \
"existing pid=#{old_pid}, refusing rexec"
return
rescue => e
logger.error "error writing pid=#{old_pid} #{e.class} #{e.message}"
return
end
end
@reexec_pid = fork do
listener_fds = listener_sockets
ENV['UNICORN_FD'] = listener_fds.keys.join(',')
Dir.chdir(START_CTX[:cwd])
cmd = [ START_CTX[0] ].concat(START_CTX[:argv])
# avoid leaking FDs we don't know about, but let before_exec
# unset FD_CLOEXEC, if anything else in the app eventually
# relies on FD inheritence.
close_sockets_on_exec(listener_fds)
# exec(command, hash) works in at least 1.9.1+, but will only be
# required in 1.9.4/2.0.0 at earliest.
cmd << listener_fds
logger.info "executing #{cmd.inspect} (in #{Dir.pwd})"
before_exec.call(self)
exec(*cmd)
end
proc_name 'master (old)'
end
def worker_spawn(worker)
listener_fds = listener_sockets
env = {}
env['UNICORN_FD'] = listener_fds.keys.join(',')
listener_fds[worker.to_io.fileno] = worker.to_io
listener_fds[worker.master.fileno] = worker.master
worker_info = [worker.nr, worker.to_io.fileno, worker.master.fileno]
env['UNICORN_WORKER'] = worker_info.join(',')
close_sockets_on_exec(listener_fds)
Process.spawn(env, START_CTX[0], *START_CTX[:argv], listener_fds)
end
def listener_sockets
listener_fds = {}
LISTENERS.each do |sock|
sock.close_on_exec = false
listener_fds[sock.fileno] = sock
end
listener_fds
end
def close_sockets_on_exec(sockets)
(3..1024).each do |io|
next if sockets.include?(io)
io = IO.for_fd(io) rescue next
io.autoclose = false
io.close_on_exec = true
end
end
# forcibly terminate all workers that haven't checked in in timeout seconds. The timeout is implemented using an unlinked File
def murder_lazy_workers
next_sleep = @timeout - 1
now = time_now.to_i
@workers.dup.each_pair do |wpid, worker|
tick = worker.tick
0 == tick and next # skip workers that haven't processed any clients
diff = now - tick
tmp = @timeout - diff
if tmp >= 0
next_sleep > tmp and next_sleep = tmp
next
end
next_sleep = 0
logger.error "worker=#{worker.nr} PID:#{wpid} timeout " \
"(#{diff}s > #{@timeout}s), killing"
kill_worker(:KILL, wpid) # take no prisoners for timeout violations
end
next_sleep <= 0 ? 1 : next_sleep
end
def after_fork_internal
@self_pipe.each(&:close).clear # this is master-only, now
@ready_pipe.close if @ready_pipe
Unicorn::Configurator::RACKUP.clear
@ready_pipe = @init_listeners = @before_exec = @before_fork = nil
# http://blade.nagaokaut.ac.jp/cgi-bin/scat.rb/ruby/ruby-core/36450
srand # remove in unicorn 6
# The OpenSSL PRNG is seeded with only the pid, and apps with frequently
# dying workers can recycle pids
OpenSSL::Random.seed(rand.to_s) if defined?(OpenSSL::Random)
end
def spawn_missing_workers
if @worker_data
worker = Unicorn::Worker.new(*@worker_data)
after_fork_internal
worker_loop(worker)
exit
end
worker_nr = -1
until (worker_nr += 1) == @worker_processes
@workers.value?(worker_nr) and next
worker = Unicorn::Worker.new(worker_nr)
before_fork.call(self, worker)
pid = @worker_exec ? worker_spawn(worker) : fork
unless pid
after_fork_internal
worker_loop(worker)
exit
end
@workers[pid] = worker
worker.atfork_parent
end
rescue => e
@logger.error(e) rescue nil
exit!
end
def maintain_worker_count
(off = @workers.size - worker_processes) == 0 and return
off < 0 and return spawn_missing_workers
@workers.each_value { |w| w.nr >= worker_processes and w.soft_kill(:QUIT) }
end
# if we get any error, try to write something back to the client
# assuming we haven't closed the socket, but don't get hung up
# if the socket is already closed or broken. We'll always ensure
# the socket is closed at the end of this function
def handle_error(client, e)
code = case e
when EOFError,Errno::ECONNRESET,Errno::EPIPE,Errno::ENOTCONN
# client disconnected on us and there's nothing we can do
when Unicorn::RequestURITooLongError
414
when Unicorn::RequestEntityTooLargeError
413
when Unicorn::HttpParserError # try to tell the client they're bad
400
else
Unicorn.log_error(@logger, "app error", e)
500
end
if code
client.kgio_trywrite(err_response(code, @request.response_start_sent))
end
client.close
rescue
end
def e100_response_write(client, env)
# We use String#freeze to avoid allocations under Ruby 2.1+
# Not many users hit this code path, so it's better to reduce the
# constant table sizes even for 1.9.3-2.0 users who'll hit extra
# allocations here.
client.write(@request.response_start_sent ?
"100 Continue\r\n\r\nHTTP/1.1 ".freeze :
"HTTP/1.1 100 Continue\r\n\r\n".freeze)
env.delete('HTTP_EXPECT'.freeze)
end
# once a client is accepted, it is processed in its entirety here
# in 3 easy steps: read request, call app, write app response
def process_client(client)
status, headers, body = @app.call(env = @request.read(client))
begin
return if @request.hijacked?
if 100 == status.to_i
e100_response_write(client, env)
status, headers, body = @app.call(env)
return if @request.hijacked?
end
@request.headers? or headers = nil
http_response_write(client, status, headers, body,
@request.response_start_sent)
ensure
body.respond_to?(:close) and body.close
end
unless client.closed? # rack.hijack may've close this for us
client.shutdown # in case of fork() in Rack app
client.close # flush and uncork socket immediately, no keepalive
end
rescue => e
handle_error(client, e)
end
def nuke_listeners!(readers)
# only called from the worker, ordering is important here
tmp = readers.dup
readers.replace([false]) # ensure worker does not continue ASAP
tmp.each { |io| io.close rescue nil } # break out of IO.select
end
# gets rid of stuff the worker has no business keeping track of
# to free some resources and drops all sig handlers.
# traps for USR1, USR2, and HUP may be set in the after_fork Proc
# by the user.
def init_worker_process(worker)
worker.atfork_child
# we'll re-trap :QUIT later for graceful shutdown iff we accept clients
exit_sigs = [ :QUIT, :TERM, :INT ]
exit_sigs.each { |sig| trap(sig) { exit!(0) } }
exit!(0) if (@sig_queue & exit_sigs)[0]
(@queue_sigs - exit_sigs).each { |sig| trap(sig, nil) }
trap(:CHLD, 'DEFAULT')
@sig_queue.clear
proc_name "worker[#{worker.nr}]"
START_CTX.clear
@workers.clear
after_fork.call(self, worker) # can drop perms and create listeners
LISTENERS.each { |sock| sock.close_on_exec = true }
worker.user(*user) if user.kind_of?(Array) && ! worker.switched
self.timeout /= 2.0 # halve it for select()
@config = nil
build_app! unless preload_app
@after_fork = @listener_opts = @orig_app = nil
readers = LISTENERS.dup
readers << worker
trap(:QUIT) { nuke_listeners!(readers) }
readers
end
def reopen_worker_logs(worker_nr)
logger.info "worker=#{worker_nr} reopening logs..."
Unicorn::Util.reopen_logs
logger.info "worker=#{worker_nr} done reopening logs"
rescue => e
logger.error(e) rescue nil
exit!(77) # EX_NOPERM in sysexits.h
end
# runs inside each forked worker, this sits around and waits
# for connections and doesn't die until the parent dies (or is
# given a INT, QUIT, or TERM signal)
def worker_loop(worker)
ppid = @master_pid
readers = init_worker_process(worker)
nr = 0 # this becomes negative if we need to reopen logs
# this only works immediately if the master sent us the signal
# (which is the normal case)
trap(:USR1) { nr = -65536 }
ready = readers.dup
@after_worker_ready.call(self, worker)
begin
nr < 0 and reopen_worker_logs(worker.nr)
nr = 0
worker.tick = time_now.to_i
tmp = ready.dup
while sock = tmp.shift
# Unicorn::Worker#kgio_tryaccept is not like accept(2) at all,
# but that will return false
if client = sock.kgio_tryaccept
process_client(client)
nr += 1
worker.tick = time_now.to_i
end
break if nr < 0
end
# make the following bet: if we accepted clients this round,
# we're probably reasonably busy, so avoid calling select()
# and do a speculative non-blocking accept() on ready listeners
# before we sleep again in select().
unless nr == 0
tmp = ready.dup
redo
end
ppid == Process.ppid or return
# timeout used so we can detect parent death:
worker.tick = time_now.to_i
ret = IO.select(readers, nil, nil, @timeout) and ready = ret[0]
rescue => e
redo if nr < 0 && readers[0]
Unicorn.log_error(@logger, "listen loop error", e) if readers[0]
end while readers[0]
end
# delivers a signal to a worker and fails gracefully if the worker
# is no longer running.
def kill_worker(signal, wpid)
Process.kill(signal, wpid)
rescue Errno::ESRCH
worker = @workers.delete(wpid) and worker.close rescue nil
end
# delivers a signal to each worker
def kill_each_worker(signal)
@workers.keys.each { |wpid| kill_worker(signal, wpid) }
end
def soft_kill_each_worker(signal)
@workers.each_value { |worker| worker.soft_kill(signal) }
end
# unlinks a PID file at given +path+ if it contains the current PID
# still potentially racy without locking the directory (which is
# non-portable and may interact badly with other programs), but the
# window for hitting the race condition is small
def unlink_pid_safe(path)
(File.read(path).to_i == $$ and File.unlink(path)) rescue nil
end
# returns a PID if a given path contains a non-stale PID file,
# nil otherwise.
def valid_pid?(path)
wpid = File.read(path).to_i
wpid <= 0 and return
Process.kill(0, wpid)
wpid
rescue Errno::EPERM
logger.info "pid=#{path} possibly stale, got EPERM signalling PID:#{wpid}"
nil
rescue Errno::ESRCH, Errno::ENOENT
# don't unlink stale pid files, racy without non-portable locking...
end
def load_config!
loaded_app = app
logger.info "reloading config_file=#{config.config_file}"
config[:listeners].replace(@init_listeners)
config.reload
config.commit!(self)
soft_kill_each_worker(:QUIT)
Unicorn::Util.reopen_logs
self.app = @orig_app
build_app! if preload_app
logger.info "done reloading config_file=#{config.config_file}"
rescue StandardError, LoadError, SyntaxError => e
Unicorn.log_error(@logger,
"error reloading config_file=#{config.config_file}", e)
self.app = loaded_app
end
# returns an array of string names for the given listener array
def listener_names(listeners = LISTENERS)
listeners.map { |io| sock_name(io) }
end
def build_app!
if app.respond_to?(:arity) && app.arity == 0
if defined?(Gem) && Gem.respond_to?(:refresh)
logger.info "Refreshing Gem list"
Gem.refresh
end
self.app = app.call
end
end
def proc_name(tag)
$0 = ([ File.basename(START_CTX[0]), tag
]).concat(START_CTX[:argv]).join(' ')
end
def redirect_io(io, path)
File.open(path, 'ab') { |fp| io.reopen(fp) } if path
io.sync = true
end
def inherit_listeners!
# inherit sockets from parents, they need to be plain Socket objects
# before they become Kgio::UNIXServer or Kgio::TCPServer
inherited = ENV['UNICORN_FD'].to_s.split(',')
# emulate sd_listen_fds() for systemd
sd_pid, sd_fds = ENV.values_at('LISTEN_PID', 'LISTEN_FDS')
if sd_pid.to_i == $$ # n.b. $$ can never be zero
# 3 = SD_LISTEN_FDS_START
inherited.concat((3...(3 + sd_fds.to_i)).to_a)
end
# to ease debugging, we will not unset LISTEN_PID and LISTEN_FDS
inherited.map! do |fd|
io = Socket.for_fd(fd.to_i)
io.autoclose = false
io = server_cast(io)
set_server_sockopt(io, listener_opts[sock_name(io)])
logger.info "inherited addr=#{sock_name(io)} fd=#{io.fileno}"
io
end
config_listeners = config[:listeners].dup
LISTENERS.replace(inherited)
# we start out with generic Socket objects that get cast to either
# Kgio::TCPServer or Kgio::UNIXServer objects; but since the Socket
# objects share the same OS-level file descriptor as the higher-level
# *Server objects; we need to prevent Socket objects from being
# garbage-collected
config_listeners -= listener_names
if config_listeners.empty? && LISTENERS.empty?
config_listeners << Unicorn::Const::DEFAULT_LISTEN
@init_listeners << Unicorn::Const::DEFAULT_LISTEN
START_CTX[:argv] << "-l#{Unicorn::Const::DEFAULT_LISTEN}"
end
NEW_LISTENERS.replace(config_listeners)
end
# call only after calling inherit_listeners!
# This binds any listeners we did NOT inherit from the parent
def bind_new_listeners!
NEW_LISTENERS.each { |addr| listen(addr) }.clear
raise ArgumentError, "no listeners" if LISTENERS.empty?
end
# try to use the monotonic clock in Ruby >= 2.1, it is immune to clock
# offset adjustments and generates less garbage (Float vs Time object)
begin
Process.clock_gettime(Process::CLOCK_MONOTONIC)
def time_now
Process.clock_gettime(Process::CLOCK_MONOTONIC)
end
rescue NameError, NoMethodError
def time_now # Ruby <= 2.0
Time.now
end
end
end