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📁 ..	-	2026-03-21 15:53
📄 lock_file.rb # daemon_controller, library for robust daemon management # Copyright (c) 2010-2025 Asynchronous B.V. # # Permission is hereby granted, free of charge, to any person obtaining a copy # of this software and associated documentation files (the "Software"), to deal # in the Software without restriction, including without limitation the rights # to use, copy, modify, merge, publish, distribute, sublicense, and/or sell # copies of the Software, and to permit persons to whom the Software is # furnished to do so, subject to the following conditions: # # The above copyright notice and this permission notice shall be included in # all copies or substantial portions of the Software. # # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR # IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, # FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE # AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER # LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, # OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN # THE SOFTWARE. require 'fcntl' module PhusionPassenger class DaemonController # A lock file is a synchronization mechanism, like a Mutex, but it also allows # inter-process synchronization (as opposed to only inter-thread synchronization # within a single process). # # Processes can obtain either a shared lock or an exclusive lock. It's possible # for multiple processes to obtain a shared lock on a file as long as no # exclusive lock has been obtained by a process. If a process has obtained an # exclusive lock, then no other processes can lock the file, whether they're # trying to obtain a shared lock or an exclusive lock. # # Note that on JRuby, LockFile can only guarantee synchronization between # threads if the different threads use the same LockFile object. Specifying the # same filename is not enough. class LockFile class AlreadyLocked < StandardError end # Create a LockFile object. The lock file is initially not locked. # # +filename+ may point to a nonexistant file. In that case, the lock # file will not be created until one's trying to obtain a lock. # # Note that LockFile will use this exact filename. So if +filename+ # is a relative filename, then the actual lock file that will be used # depends on the current working directory. def initialize(filename) @filename = filename end # Obtain an exclusive lock on the lock file, yield the given block, # then unlock the lockfile. If the lock file was already locked (whether # shared or exclusively) by another process/thread then this method will # block until the lock file has been unlocked. # # The lock file must be writable, otherwise an Errno::EACCESS # exception will be raised. def exclusive_lock File.open(@filename, 'w') do \|f\| if Fcntl.const_defined? :F_SETFD f.fcntl(Fcntl::F_SETFD, Fcntl::FD_CLOEXEC) end f.flock(File::LOCK_EX) yield end end # Obtain an exclusive lock on the lock file, yield the given block, # then unlock the lockfile. If the lock file was already exclusively # locked by another process/thread then this method will # block until the exclusive lock has been released. This method will not # block if only shared locks have been obtained. # # The lock file must be writable, otherwise an Errno::EACCESS # exception will be raised. def shared_lock File.open(@filename, 'w+') do \|f\| if Fcntl.const_defined? :F_SETFD f.fcntl(Fcntl::F_SETFD, Fcntl::FD_CLOEXEC) end f.flock(File::LOCK_SH) yield end end # Try to obtain a shared lock on the lock file, similar to #shared_lock. # But unlike #shared_lock, this method will raise AlreadyLocked if # no lock can be obtained, instead of blocking. # # If a lock can be obtained, then the given block will be yielded. def try_shared_lock File.open(@filename, 'w+') do \|f\| if Fcntl.const_defined? :F_SETFD f.fcntl(Fcntl::F_SETFD, Fcntl::FD_CLOEXEC) end if f.flock(File::LOCK_SH \| File::LOCK_NB) yield else raise AlreadyLocked end end end # Try to obtain an exclusive lock on the lock file, similar to #exclusive_lock. # But unlike #exclusive_lock, this method will raise AlreadyLocked if # no lock can be obtained, instead of blocking. # # If a lock can be obtained, then the given block will be yielded. def try_exclusive_lock File.open(@filename, 'w') do \|f\| if Fcntl.const_defined? :F_SETFD f.fcntl(Fcntl::F_SETFD, Fcntl::FD_CLOEXEC) end if f.flock(File::LOCK_EX \| File::LOCK_NB) yield else raise AlreadyLocked end end end end # class LockFile end # class DaemonController end # module PhusionPassenger	4.97 KB	2025-11-20 11:36
📄 spawn.rb # daemon_controller, library for robust daemon management # Copyright (c) 2010-2025 Asynchronous B.V. # # Permission is hereby granted, free of charge, to any person obtaining a copy # of this software and associated documentation files (the "Software"), to deal # in the Software without restriction, including without limitation the rights # to use, copy, modify, merge, publish, distribute, sublicense, and/or sell # copies of the Software, and to permit persons to whom the Software is # furnished to do so, subject to the following conditions: # # The above copyright notice and this permission notice shall be included in # all copies or substantial portions of the Software. # # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR # IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, # FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE # AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER # LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, # OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN # THE SOFTWARE. # This helper script is used for daemonizing a command by executing it and # then exiting ourselves. Used on Ruby 1.9 and JRuby because forking may not # be safe/supported on all platforms. Process.setsid Process.spawn(ARGV[0])	1.36 KB	2025-11-20 11:36
📄 version.rb # daemon_controller, library for robust daemon management # Copyright (c) 2010-2025 Asynchronous B.V. # # Permission is hereby granted, free of charge, to any person obtaining a copy # of this software and associated documentation files (the "Software"), to deal # in the Software without restriction, including without limitation the rights # to use, copy, modify, merge, publish, distribute, sublicense, and/or sell # copies of the Software, and to permit persons to whom the Software is # furnished to do so, subject to the following conditions: # # The above copyright notice and this permission notice shall be included in # all copies or substantial portions of the Software. # # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR # IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, # FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE # AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER # LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, # OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN # THE SOFTWARE. module PhusionPassenger class DaemonController MAJOR = 1 MINOR = 2 TINY = 1 VERSION_STRING = "#{MAJOR}.#{MINOR}.#{TINY}" end # class DaemonController end # module PhusionPassenger	1.32 KB	2025-11-20 11:36

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