class Unicorn::Launcher
Public Class Methods
daemonize!(options = nil)
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We don't do a lot of standard daemonization stuff:
* umask is whatever was set by the parent process at startup and can be set in config.ru and config_file, so making it 0000 and potentially exposing sensitive log data can be bad policy. * don't bother to chdir("/") here since unicorn is designed to run inside APP_ROOT. Unicorn will also re-chdir() to the directory it was started in when being re-executed to pickup code changes if the original deployment directory is a symlink or otherwise got replaced.
# File lib/unicorn/launcher.rb, line 21 def self.daemonize!(options = nil) $stdin.reopen("/dev/null") # We only start a new process group if we're not being reexecuted # and inheriting file descriptors from our parent unless ENV['UNICORN_FD'] if options # grandparent - reads pipe, exits when master is ready # \_ parent - exits immediately ASAP # \_ unicorn master - writes to pipe when ready rd, wr = IO.pipe grandparent = $$ if fork wr.close # grandparent does not write else rd.close # unicorn master does not read Process.setsid exit if fork # parent dies now end if grandparent == $$ # this will block until Server#join runs (or it dies) master_pid = (rd.readpartial(16) rescue nil).to_i unless master_pid > 1 warn "master failed to start, check stderr log for details" exit!(1) end exit 0 else # unicorn master process options[:ready_pipe] = wr end else # backwards compat exit if fork Process.setsid exit if fork end # $stderr/$stderr can/will be redirected separately in the Unicorn config Unicorn::Configurator::DEFAULTS[:stderr_path] = "/dev/null" Unicorn::Configurator::DEFAULTS[:stdout_path] = "/dev/null" end end