diff options
Diffstat (limited to 'lib/unicorn.rb')
| -rw-r--r-- | lib/unicorn.rb | 495 |
1 files changed, 276 insertions, 219 deletions
diff --git a/lib/unicorn.rb b/lib/unicorn.rb index d442f63..4a4e2e1 100644 --- a/lib/unicorn.rb +++ b/lib/unicorn.rb @@ -1,6 +1,6 @@ -require 'logger' +require 'fcntl' -require 'unicorn/socket' +require 'unicorn/socket_helper' require 'unicorn/const' require 'unicorn/http_request' require 'unicorn/http_response' @@ -23,18 +23,32 @@ module Unicorn # forked worker children. class HttpServer attr_reader :logger - include Process include ::Unicorn::SocketHelper - DEFAULT_START_CTX = { + # prevents IO objects in here from being GC-ed + IO_PURGATORY = [] + + # all bound listener sockets + LISTENERS = [] + + # This hash maps PIDs to Workers + WORKERS = {} + + # See: http://cr.yp.to/docs/selfpipe.html + SELF_PIPE = [] + + # signal queue used for self-piping + SIG_QUEUE = [] + + # We populate this at startup so we can figure out how to reexecute + # and upgrade the currently running instance of Unicorn + START_CTX = { :argv => ARGV.map { |arg| arg.dup }, # don't rely on Dir.pwd here since it's not symlink-aware, and # symlink dirs are the default with Capistrano... :cwd => `/bin/sh -c pwd`.chomp("\n"), :zero => $0.dup, - :environ => {}.merge!(ENV), - :umask => File.umask, - }.freeze + } Worker = Struct.new(:nr, :tempfile) unless defined?(Worker) class Worker @@ -46,22 +60,17 @@ module Unicorn # 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.workers.join to join the thread that's processing + # HttpServer.run.join to join the thread that's processing # incoming requests on the socket. def initialize(app, options = {}) - start_ctx = options.delete(:start_ctx) - @start_ctx = DEFAULT_START_CTX.dup - @start_ctx.merge!(start_ctx) if start_ctx @app = app - @mode = :idle - @master_pid = $$ - @workers = Hash.new - @io_purgatory = [] # prevents IO objects in here from being GC-ed - @request = @rd_sig = @wr_sig = nil + @pid = nil @reexec_pid = 0 + @init_listeners = options[:listeners] ? options[:listeners].dup : [] @config = Configurator.new(options.merge(:use_defaults => true)) + @listener_opts = {} @config.commit!(self, :skip => [:listeners, :pid]) - @listeners = [] + @request = HttpRequest.new(@logger) end # Runs the thing. Returns self so you can run join on it @@ -72,44 +81,55 @@ module Unicorn # before they become UNIXServer or TCPServer inherited = ENV['UNICORN_FD'].to_s.split(/,/).map do |fd| io = Socket.for_fd(fd.to_i) - set_server_sockopt(io) - @io_purgatory << io - logger.info "inherited: #{io} fd=#{fd} addr=#{sock_name(io)}" + set_server_sockopt(io, @listener_opts[sock_name(io)]) + IO_PURGATORY << io + logger.info "inherited addr=#{sock_name(io)} fd=#{fd}" server_cast(io) end config_listeners = @config[:listeners].dup - @listeners.replace(inherited) + LISTENERS.replace(inherited) # we start out with generic Socket objects that get cast to either # TCPServer or 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 + end config_listeners.each { |addr| listen(addr) } - raise ArgumentError, "no listeners" if @listeners.empty? + raise ArgumentError, "no listeners" if LISTENERS.empty? self.pid = @config[:pid] build_app! if @preload_app - $stderr.reopen(File.open(@stderr_path, "a")) if @stderr_path - $stdout.reopen(File.open(@stdout_path, "a")) if @stdout_path - $stderr.sync = $stdout.sync = true - spawn_missing_workers + maintain_worker_count 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 = listener_names + cur_names, dead_names = [], [] + listener_names.each do |name| + if "/" == name[0..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 = cur_names - set_names + dead_names += cur_names - set_names + dead_names.uniq! - @listeners.delete_if do |io| + LISTENERS.delete_if do |io| if dead_names.include?(sock_name(io)) - @io_purgatory.delete_if { |pio| pio.fileno == io.fileno } - destroy_safely(io) - true + IO_PURGATORY.delete_if do |pio| + pio.fileno == io.fileno && (pio.close rescue nil).nil? # true + end + (io.close rescue nil).nil? # true else + set_server_sockopt(io, @listener_opts[sock_name(io)]) false end end @@ -117,6 +137,9 @@ module Unicorn (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 + # sets the path for the PID file of the master process def pid=(path) if path @@ -125,26 +148,25 @@ module Unicorn raise ArgumentError, "Already running on PID:#{x} " \ "(or pid=#{path} is stale)" end - File.open(path, 'wb') { |fp| fp.syswrite("#{$$}\n") } end - unlink_pid_safe(@pid) if @pid && @pid != path + unlink_pid_safe(@pid) if @pid + File.open(path, 'wb') { |fp| fp.syswrite("#$$\n") } if path @pid = path end # add a given address to the +listeners+ set, idempotently # Allows workers to add a private, per-process listener via the # @after_fork hook. Very useful for debugging and testing. - def listen(address) + def listen(address, opt = {}.merge(@listener_opts[address] || {})) return if String === address && listener_names.include?(address) - if io = bind_listen(address, @backlog) - if Socket == io.class - @io_purgatory << io + if io = bind_listen(address, opt) + unless TCPServer === io || UNIXServer === io + IO_PURGATORY << io io = server_cast(io) end - logger.info "#{io} listening on PID:#{$$} " \ - "fd=#{io.fileno} addr=#{sock_name(io)}" - @listeners << io + logger.info "listening on addr=#{sock_name(io)} fd=#{io.fileno}" + LISTENERS << io else logger.error "adding listener failed addr=#{address} (in use)" raise Errno::EADDRINUSE, address @@ -158,55 +180,55 @@ module Unicorn def join # this pipe is used to wake us up from select(2) in #join when signals # are trapped. See trap_deferred - @rd_sig, @wr_sig = IO.pipe unless (@rd_sig && @wr_sig) - @rd_sig.nonblock = @wr_sig.nonblock = true + init_self_pipe! + respawn = true - reset_master - $0 = "unicorn master" - logger.info "master process ready" # test relies on this message + QUEUE_SIGS.each { |sig| trap_deferred(sig) } + trap(:CHLD) { |sig_nr| awaken_master } + proc_name 'master' + logger.info "master process ready" # test_exec.rb relies on this message begin loop do reap_all_workers - case @mode - when :idle + case SIG_QUEUE.shift + when nil murder_lazy_workers - spawn_missing_workers - when 'QUIT' # graceful shutdown + maintain_worker_count if respawn + master_sleep + when :QUIT # graceful shutdown break - when 'TERM', 'INT' # immediate shutdown + when :TERM, :INT # immediate shutdown stop(false) break - when 'USR1' # user-defined (probably something like log reopening) - kill_each_worker('USR1') + when :USR1 # rotate logs + logger.info "master reopening logs..." Unicorn::Util.reopen_logs - reset_master - when 'USR2' # exec binary, stay alive in case something went wrong + logger.info "master done reopening logs" + kill_each_worker(:USR1) + when :USR2 # exec binary, stay alive in case something went wrong reexec - reset_master - when 'HUP' + when :WINCH + if Process.ppid == 1 || Process.getpgrp != $$ + respawn = false + logger.info "gracefully stopping all workers" + kill_each_worker(:QUIT) + else + logger.info "SIGWINCH ignored because we're not daemonized" + end + when :TTIN + @worker_processes += 1 + when :TTOU + @worker_processes -= 1 if @worker_processes > 0 + when :HUP + respawn = true if @config.config_file load_config! - reset_master redo # immediate reaping since we may have QUIT workers else # exec binary and exit if there's no config file logger.info "config_file not present, reexecuting binary" reexec break end - else - logger.error "master process in unknown mode: #{@mode}, resetting" - reset_master - end - reap_all_workers - - ready = begin - IO.select([@rd_sig], nil, nil, 1) or next - rescue Errno::EINTR # next - end - ready[0] && ready[0][0] or next - begin # just consume the pipe when we're awakened, @mode is set - loop { @rd_sig.sysread(Const::CHUNK_SIZE) } - rescue Errno::EAGAIN, Errno::EINTR # next end end rescue Errno::EINTR @@ -214,25 +236,24 @@ module Unicorn rescue Object => e logger.error "Unhandled master loop exception #{e.inspect}." logger.error e.backtrace.join("\n") - reset_master retry end stop # gracefully shutdown all workers on our way out - logger.info "master PID:#{$$} join complete" + logger.info "master complete" unlink_pid_safe(@pid) if @pid end # Terminates all workers, but does not exit master process def stop(graceful = true) - kill_each_worker(graceful ? 'QUIT' : 'TERM') + kill_each_worker(graceful ? :QUIT : :TERM) timeleft = @timeout step = 0.2 reap_all_workers - until @workers.empty? + until WORKERS.empty? sleep(step) reap_all_workers (timeleft -= step) > 0 and next - kill_each_worker('KILL') + kill_each_worker(:KILL) end ensure self.listeners = [] @@ -241,55 +262,64 @@ module Unicorn private # list of signals we care about and trap in master. - TRAP_SIGS = %w(QUIT INT TERM USR1 USR2 HUP).map { |x| x.freeze }.freeze + QUEUE_SIGS = [ :WINCH, :QUIT, :INT, :TERM, :USR1, :USR2, :HUP, + :TTIN, :TTOU ].freeze # defer a signal for later processing in #join (master process) def trap_deferred(signal) trap(signal) do |sig_nr| - # we only handle/defer one signal at a time and ignore all others - # until we're ready again. Queueing signals can lead to more bugs, - # and simplicity is the most important thing - TRAP_SIGS.each { |sig| trap(sig, 'IGNORE') } - if Symbol === @mode - @mode = signal - begin - @wr_sig.syswrite('.') # wakeup master process from IO.select - rescue Errno::EAGAIN - rescue Errno::EINTR - retry - end + if SIG_QUEUE.size < 5 + SIG_QUEUE << signal + awaken_master + else + logger.error "ignoring SIG#{signal}, queue=#{SIG_QUEUE.inspect}" end end end + # wait for a signal hander to wake us up and then consume the pipe + # Wake up every second anyways to run murder_lazy_workers + def master_sleep + begin + ready = IO.select([SELF_PIPE.first], nil, nil, 1) or return + ready.first && ready.first.first or return + loop { SELF_PIPE.first.read_nonblock(Const::CHUNK_SIZE) } + rescue Errno::EAGAIN, Errno::EINTR + end + end - def reset_master - @mode = :idle - TRAP_SIGS.each { |sig| trap_deferred(sig) } + def awaken_master + begin + SELF_PIPE.last.write_nonblock('.') # wakeup master process from select + rescue Errno::EAGAIN, Errno::EINTR + # pipe is full, master should wake up anyways + retry + end end # reaps all unreaped workers def reap_all_workers begin loop do - pid = waitpid(-1, WNOHANG) or break + pid, status = Process.waitpid2(-1, Process::WNOHANG) + pid or break if @reexec_pid == pid - logger.error "reaped exec()-ed PID:#{pid} status=#{$?.exitstatus}" + logger.error "reaped #{status.inspect} exec()-ed" @reexec_pid = 0 self.pid = @pid.chomp('.oldbin') if @pid + proc_name 'master' else - worker = @workers.delete(pid) + worker = WORKERS.delete(pid) worker.tempfile.close rescue nil - logger.info "reaped PID:#{pid} " \ - "worker=#{worker.nr rescue 'unknown'} " \ - "status=#{$?.exitstatus}" + logger.info "reaped #{status.inspect} " \ + "worker=#{worker.nr rescue 'unknown'}" end end rescue Errno::ECHILD end end - # reexecutes the @start_ctx with a new binary + # reexecutes the START_CTX with a new binary def reexec if @reexec_pid > 0 begin @@ -317,19 +347,26 @@ module Unicorn end @reexec_pid = fork do - @rd_sig.close if @rd_sig - @wr_sig.close if @wr_sig - @workers.values.each { |other| other.tempfile.close rescue nil } - - ENV.replace(@start_ctx[:environ]) - ENV['UNICORN_FD'] = @listeners.map { |sock| sock.fileno }.join(',') - File.umask(@start_ctx[:umask]) - Dir.chdir(@start_ctx[:cwd]) - cmd = [ @start_ctx[:zero] ] + @start_ctx[:argv] + listener_fds = LISTENERS.map { |sock| sock.fileno } + ENV['UNICORN_FD'] = listener_fds.join(',') + Dir.chdir(START_CTX[:cwd]) + cmd = [ START_CTX[:zero] ] + 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. + (3..1024).each do |io| + next if listener_fds.include?(io) + io = IO.for_fd(io) rescue nil + io or next + IO_PURGATORY << io + io.fcntl(Fcntl::F_SETFD, Fcntl::FD_CLOEXEC) + end logger.info "executing #{cmd.inspect} (in #{Dir.pwd})" - @before_exec.call(self) if @before_exec + @before_exec.call(self) exec(*cmd) end + proc_name 'master (old)' end # forcibly terminate all workers that haven't checked in in @timeout @@ -339,48 +376,62 @@ module Unicorn # is stale for >@timeout seconds, then we'll kill the corresponding # worker. def murder_lazy_workers - now = Time.now - @workers.each_pair do |pid, worker| - (now - worker.tempfile.ctime) <= @timeout and next + WORKERS.each_pair do |pid, worker| + stat = worker.tempfile.stat + stat.mode == 0100000 and next + Time.now - stat.ctime <= @timeout and next logger.error "worker=#{worker.nr} PID:#{pid} is too old, killing" - kill_worker('KILL', pid) # take no prisoners for @timeout violations + kill_worker(:KILL, pid) # take no prisoners for @timeout violations worker.tempfile.close rescue nil end end def spawn_missing_workers - return if @workers.size == @worker_processes (0...@worker_processes).each do |worker_nr| - @workers.values.include?(worker_nr) and next - tempfile = Tempfile.new('') # as short as possible to save dir space + WORKERS.values.include?(worker_nr) and next + begin + Dir.chdir(START_CTX[:cwd]) + rescue Errno::ENOENT => err + logger.fatal "#{err.inspect} (#{START_CTX[:cwd]})" + SIG_QUEUE << :QUIT # forcibly emulate SIGQUIT + return + end + tempfile = Tempfile.new(nil) # as short as possible to save dir space tempfile.unlink # don't allow other processes to find or see it - tempfile.sync = true worker = Worker.new(worker_nr, tempfile) - @before_fork.call(self, worker.nr) + @before_fork.call(self, worker) pid = fork { worker_loop(worker) } - @workers[pid] = worker + WORKERS[pid] = worker end end + def maintain_worker_count + (off = WORKERS.size - @worker_processes) == 0 and return + off < 0 and return spawn_missing_workers + WORKERS.each_pair { |pid,w| + w.nr >= @worker_processes and kill_worker(:QUIT, pid) rescue nil + } + 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) - env = @request.read(client) or return - app_response = @app.call(env) - HttpResponse.write(client, app_response) + HttpResponse.write(client, @app.call(@request.read(client))) + # 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 rescue EOFError,Errno::ECONNRESET,Errno::EPIPE,Errno::EINVAL,Errno::EBADF - client.closed? or client.close rescue nil + client.write_nonblock(Const::ERROR_500_RESPONSE) rescue nil + client.close rescue nil + rescue HttpParserError # try to tell the client they're bad + client.write_nonblock(Const::ERROR_400_RESPONSE) rescue nil + client.close rescue nil rescue Object => e + client.write_nonblock(Const::ERROR_500_RESPONSE) rescue nil + client.close rescue nil logger.error "Read error: #{e.inspect}" logger.error e.backtrace.join("\n") - ensure - begin - client.closed? or client.close - rescue Object => e - logger.error "Client error: #{e.inspect}" - logger.error e.backtrace.join("\n") - end - @request.reset end # gets rid of stuff the worker has no business keeping track of @@ -388,119 +439,107 @@ module Unicorn # traps for USR1, USR2, and HUP may be set in the @after_fork Proc # by the user. def init_worker_process(worker) - build_app! unless @preload_app - TRAP_SIGS.each { |sig| trap(sig, 'IGNORE') } - trap('CHLD', 'DEFAULT') - trap('USR1') do - @logger.info "worker=#{worker.nr} rotating logs..." - Unicorn::Util.reopen_logs - @logger.info "worker=#{worker.nr} done rotating logs" - end + QUEUE_SIGS.each { |sig| trap(sig, 'IGNORE') } + trap(:CHLD, 'DEFAULT') + SIG_QUEUE.clear + proc_name "worker[#{worker.nr}]" + START_CTX.clear + init_self_pipe! + WORKERS.values.each { |other| other.tempfile.close! rescue nil } + WORKERS.clear + LISTENERS.each { |sock| sock.fcntl(Fcntl::F_SETFD, Fcntl::FD_CLOEXEC) } + worker.tempfile.fcntl(Fcntl::F_SETFD, Fcntl::FD_CLOEXEC) + @after_fork.call(self, worker) # can drop perms + @timeout /= 2.0 # halve it for select() + build_app! unless @config[:preload_app] + end - $0 = "unicorn worker[#{worker.nr}]" - @rd_sig.close if @rd_sig - @wr_sig.close if @wr_sig - @workers.values.each { |other| other.tempfile.close rescue nil } - @workers.clear - @start_ctx.clear - @mode = @start_ctx = @workers = @rd_sig = @wr_sig = nil - @listeners.each { |sock| set_cloexec(sock) } - ENV.delete('UNICORN_FD') - @after_fork.call(self, worker.nr) if @after_fork - @request = HttpRequest.new(logger) + 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" + init_self_pipe! 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) + master_pid = Process.ppid # slightly racy, but less memory usage init_worker_process(worker) - nr = 0 - tempfile = worker.tempfile - alive = true - ready = @listeners - client = nil - %w(TERM INT).each { |sig| trap(sig) { exit(0) } } # instant shutdown - trap('QUIT') do - alive = false - @listeners.each { |sock| sock.close rescue nil } # break IO.select - end + nr = 0 # this becomes negative if we need to reopen logs + alive = worker.tempfile # tempfile is our lifeline to the master process + ready = LISTENERS + t = ti = 0 + + # closing anything we IO.select on will raise EBADF + trap(:USR1) { nr = -65536; SELF_PIPE.first.close rescue nil } + trap(:QUIT) { alive = nil; LISTENERS.each { |s| s.close rescue nil } } + [:TERM, :INT].each { |sig| trap(sig) { exit!(0) } } # instant shutdown + @logger.info "worker=#{worker.nr} ready" - while alive && @master_pid == ppid - # we're a goner in @timeout seconds anyways if tempfile.chmod + begin + nr < 0 and reopen_worker_logs(worker.nr) + nr = 0 + + # we're a goner in @timeout seconds anyways if alive.chmod # breaks, so don't trap the exception. Using fchmod() since # futimes() is not available in base Ruby and I very strongly # prefer temporary files to be unlinked for security, # performance and reliability reasons, so utime is out. No-op # changes with chmod doesn't update ctime on all filesystems; so - # we increment our counter each and every time. - tempfile.chmod(nr += 1) + # we change our counter each and every time (after process_client + # and before IO.select). + t == (ti = Time.now.to_i) or alive.chmod(t = ti) - begin - accepted = false - ready.each do |sock| - begin - client = begin - sock.accept_nonblock - rescue Errno::EAGAIN - next - end - accepted = client.sync = true - client.nonblock = false - set_client_sockopt(client) if TCPSocket === client - process_client(client) - rescue Errno::ECONNABORTED - # client closed the socket even before accept - if client && !client.closed? - client.close rescue nil - end - end - tempfile.chmod(nr += 1) - end - client = nil - - # make the following bet: if we accepted clients this round, - # we're probably reasonably busy, so avoid calling select(2) - # and try to do a blind non-blocking accept(2) on everything - # before we sleep again in select - if accepted - ready = @listeners - else - begin - tempfile.chmod(nr += 1) - # timeout used so we can detect parent death: - ret = IO.select(@listeners, nil, nil, @timeout/2.0) or next - ready = ret[0] - rescue Errno::EINTR - ready = @listeners - rescue Errno::EBADF => e - exit(alive ? 1 : 0) - end - end - rescue SystemExit => e - exit(e.status) - rescue Object => e - if alive - logger.error "Unhandled listen loop exception #{e.inspect}." - logger.error e.backtrace.join("\n") + ready.each do |sock| + begin + process_client(sock.accept_nonblock) + nr += 1 + t == (ti = Time.now.to_i) or alive.chmod(t = ti) + rescue Errno::EAGAIN, Errno::ECONNABORTED end + break if nr < 0 end - end + + # make the following bet: if we accepted clients this round, + # we're probably reasonably busy, so avoid calling select() + # and do a speculative accept_nonblock on every listener + # before we sleep again in select(). + redo unless nr == 0 # (nr < 0) => reopen logs + + master_pid == Process.ppid or return + alive.chmod(t = 0) + begin + # timeout used so we can detect parent death: + ret = IO.select(LISTENERS, nil, SELF_PIPE, @timeout) or redo + ready = ret.first + rescue Errno::EINTR + ready = LISTENERS + rescue Errno::EBADF + nr < 0 or return + end + rescue Object => e + if alive + logger.error "Unhandled listen loop exception #{e.inspect}." + logger.error e.backtrace.join("\n") + end + end while alive end # delivers a signal to a worker and fails gracefully if the worker # is no longer running. def kill_worker(signal, pid) begin - kill(signal, pid) + Process.kill(signal, pid) rescue Errno::ESRCH - worker = @workers.delete(pid) and worker.tempfile.close rescue nil + worker = WORKERS.delete(pid) and worker.tempfile.close rescue nil end end # delivers a signal to each worker def kill_each_worker(signal) - @workers.keys.each { |pid| kill_worker(signal, pid) } + WORKERS.keys.each { |pid| kill_worker(signal, pid) } end # unlinks a PID file at given +path+ if it contains the current PID @@ -514,7 +553,7 @@ module Unicorn def valid_pid?(path) if File.exist?(path) && (pid = File.read(path).to_i) > 1 begin - kill(0, pid) + Process.kill(0, pid) return pid rescue Errno::ESRCH end @@ -525,9 +564,11 @@ module Unicorn def load_config! begin logger.info "reloading config_file=#{@config.config_file}" + @config[:listeners].replace(@init_listeners) @config.reload @config.commit!(self) - kill_each_worker('QUIT') + kill_each_worker(:QUIT) + Unicorn::Util.reopen_logs logger.info "done reloading config_file=#{@config.config_file}" rescue Object => e logger.error "error reloading config_file=#{@config.config_file}: " \ @@ -536,7 +577,7 @@ module Unicorn end # returns an array of string names for the given listener array - def listener_names(listeners = @listeners) + def listener_names(listeners = LISTENERS) listeners.map { |io| sock_name(io) } end @@ -544,5 +585,21 @@ module Unicorn @app = @app.call if @app.respond_to?(:arity) && @app.arity == 0 end + def proc_name(tag) + $0 = ([ File.basename(START_CTX[:zero]), tag ] + + START_CTX[:argv]).join(' ') + end + + def redirect_io(io, path) + File.open(path, 'a') { |fp| io.reopen(fp) } if path + io.sync = true + end + + def init_self_pipe! + SELF_PIPE.each { |io| io.close rescue nil } + SELF_PIPE.replace(IO.pipe) + SELF_PIPE.each { |io| io.fcntl(Fcntl::F_SETFD, Fcntl::FD_CLOEXEC) } + end + end end |