Thin::Daemonizable

    # File lib/thin/daemonizing.rb, line 29
29:     def self.included(base)
30:       base.extend ClassMethods
31:     end

    # File lib/thin/daemonizing.rb, line 65
65:     def change_privilege(user, group=user)
66:       log ">> Changing process privilege to #{user}:#{group}"
67:       
68:       uid, gid = Process.euid, Process.egid
69:       target_uid = Etc.getpwnam(user).uid
70:       target_gid = Etc.getgrnam(group).gid
71: 
72:       if uid != target_uid || gid != target_gid
73:         # Change process ownership
74:         Process.initgroups(user, target_gid)
75:         Process::GID.change_privilege(target_gid)
76:         Process::UID.change_privilege(target_uid)
77:       end
78:     rescue Errno::EPERM => e
79:       log "Couldn't change user and group to #{user}:#{group}: #{e}"
80:     end

    # File lib/thin/daemonizing.rb, line 38
38:     def daemonize
39:       raise PlatformNotSupported, 'Daemonizing is not supported on Windows'     if Thin.win?
40:       raise ArgumentError,        'You must specify a pid_file to daemonize' unless @pid_file
41:       
42:       remove_stale_pid_file
43:       
44:       pwd = Dir.pwd # Current directory is changed during daemonization, so store it
45:       
46:       # HACK we need to create the directory before daemonization to prevent a bug under 1.9
47:       #      ignoring all signals when the directory is created after daemonization.
48:       FileUtils.mkdir_p File.dirname(@pid_file)
49:       FileUtils.mkdir_p File.dirname(@log_file)
50:       
51:       Daemonize.daemonize(File.expand_path(@log_file), name)
52:       
53:       Dir.chdir(pwd)
54:       
55:       write_pid_file
56:       
57:       at_exit do
58:         log ">> Exiting!"
59:         remove_pid_file
60:       end
61:     end

    # File lib/thin/daemonizing.rb, line 83
83:     def on_restart(&block)
84:       @on_restart = block
85:     end

    # File lib/thin/daemonizing.rb, line 33
33:     def pid
34:       File.exist?(pid_file) ? open(pid_file).read.to_i : nil
35:     end

    # File lib/thin/daemonizing.rb, line 88
88:     def restart
89:       if @on_restart
90:         log '>> Restarting ...'
91:         stop
92:         remove_pid_file
93:         @on_restart.call
94:         exit!
95:       end
96:     end

     # File lib/thin/daemonizing.rb, line 157
157:       def remove_pid_file
158:         File.delete(@pid_file) if @pid_file && File.exists?(@pid_file)
159:       end

     # File lib/thin/daemonizing.rb, line 168
168:       def remove_stale_pid_file
169:         if File.exist?(@pid_file)
170:           if pid && Process.running?(pid)
171:             raise PidFileExist, "#{@pid_file} already exists, seems like it's already running (process ID: #{pid}). " +
172:                                 "Stop the process or delete #{@pid_file}."
173:           else
174:             log ">> Deleting stale PID file #{@pid_file}"
175:             remove_pid_file
176:           end
177:         end
178:       end

     # File lib/thin/daemonizing.rb, line 161
161:       def write_pid_file
162:         log ">> Writing PID to #{@pid_file}"
163:         open(@pid_file,"w") { |f| f.write(Process.pid) }
164:         File.chmod(0644, @pid_file)
165:       end