# -*- test-case-name: twisted.test.test_process -*- # Copyright (c) Twisted Matrix Laboratories. # See LICENSE for details. """ UNIX Process management. Do NOT use this module directly - use reactor.spawnProcess() instead. Maintainer: Itamar Shtull-Trauring """ # System Imports import gc, os, sys, stat, traceback, select, signal, errno try: import pty except ImportError: pty = None try: import fcntl, termios except ImportError: fcntl = None from zope.interface import implements from twisted.python import log, failure from twisted.python.util import switchUID from twisted.internet import fdesc, abstract, error from twisted.internet.main import CONNECTION_LOST, CONNECTION_DONE from twisted.internet._baseprocess import BaseProcess from twisted.internet.interfaces import IProcessTransport # Some people were importing this, which is incorrect, just keeping it # here for backwards compatibility: ProcessExitedAlready = error.ProcessExitedAlready reapProcessHandlers = {} def reapAllProcesses(): """ Reap all registered processes. """ for process in reapProcessHandlers.values(): process.reapProcess() def registerReapProcessHandler(pid, process): """ Register a process handler for the given pid, in case L{reapAllProcesses} is called. @param pid: the pid of the process. @param process: a process handler. """ if pid in reapProcessHandlers: raise RuntimeError("Try to register an already registered process.") try: auxPID, status = os.waitpid(pid, os.WNOHANG) except: log.msg('Failed to reap %d:' % pid) log.err() auxPID = None if auxPID: process.processEnded(status) else: # if auxPID is 0, there are children but none have exited reapProcessHandlers[pid] = process def unregisterReapProcessHandler(pid, process): """ Unregister a process handler previously registered with L{registerReapProcessHandler}. """ if not (pid in reapProcessHandlers and reapProcessHandlers[pid] == process): raise RuntimeError("Try to unregister a process not registered.") del reapProcessHandlers[pid] def detectLinuxBrokenPipeBehavior(): """ On some Linux version, write-only pipe are detected as readable. This function is here to check if this bug is present or not. See L{ProcessWriter.doRead} for a more detailed explanation. """ global brokenLinuxPipeBehavior r, w = os.pipe() os.write(w, 'a') reads, writes, exes = select.select([w], [], [], 0) if reads: # Linux < 2.6.11 says a write-only pipe is readable. brokenLinuxPipeBehavior = True else: brokenLinuxPipeBehavior = False os.close(r) os.close(w) # Call at import time detectLinuxBrokenPipeBehavior() class ProcessWriter(abstract.FileDescriptor): """ (Internal) Helper class to write into a Process's input pipe. I am a helper which describes a selectable asynchronous writer to a process's input pipe, including stdin. @ivar enableReadHack: A flag which determines how readability on this write descriptor will be handled. If C{True}, then readability may indicate the reader for this write descriptor has been closed (ie, the connection has been lost). If C{False}, then readability events are ignored. """ connected = 1 ic = 0 enableReadHack = False def __init__(self, reactor, proc, name, fileno, forceReadHack=False): """ Initialize, specifying a Process instance to connect to. """ abstract.FileDescriptor.__init__(self, reactor) fdesc.setNonBlocking(fileno) self.proc = proc self.name = name self.fd = fileno if not stat.S_ISFIFO(os.fstat(self.fileno()).st_mode): # If the fd is not a pipe, then the read hack is never # applicable. This case arises when ProcessWriter is used by # StandardIO and stdout is redirected to a normal file. self.enableReadHack = False elif forceReadHack: self.enableReadHack = True else: # Detect if this fd is actually a write-only fd. If it's # valid to read, don't try to detect closing via read. # This really only means that we cannot detect a TTY's write # pipe being closed. try: os.read(self.fileno(), 0) except OSError: # It's a write-only pipe end, enable hack self.enableReadHack = True if self.enableReadHack: self.startReading() def fileno(self): """ Return the fileno() of my process's stdin. """ return self.fd def writeSomeData(self, data): """ Write some data to the open process. """ rv = fdesc.writeToFD(self.fd, data) if rv == len(data) and self.enableReadHack: # If the send buffer is now empty and it is necessary to monitor # this descriptor for readability to detect close, try detecting # readability now. self.startReading() return rv def write(self, data): self.stopReading() abstract.FileDescriptor.write(self, data) def doRead(self): """ The only way a write pipe can become "readable" is at EOF, because the child has closed it, and we're using a reactor which doesn't distinguish between readable and closed (such as the select reactor). Except that's not true on linux < 2.6.11. It has the following characteristics: write pipe is completely empty => POLLOUT (writable in select), write pipe is not completely empty => POLLIN (readable in select), write pipe's reader closed => POLLIN|POLLERR (readable and writable in select) That's what this funky code is for. If linux was not broken, this function could be simply "return CONNECTION_LOST". BUG: We call select no matter what the reactor. If the reactor is pollreactor, and the fd is > 1024, this will fail. (only occurs on broken versions of linux, though). """ if self.enableReadHack: if brokenLinuxPipeBehavior: fd = self.fd r, w, x = select.select([fd], [fd], [], 0) if r and w: return CONNECTION_LOST else: return CONNECTION_LOST else: self.stopReading() def connectionLost(self, reason): """ See abstract.FileDescriptor.connectionLost. """ # At least on OS X 10.4, exiting while stdout is non-blocking can # result in data loss. For some reason putting the file descriptor # back into blocking mode seems to resolve this issue. fdesc.setBlocking(self.fd) abstract.FileDescriptor.connectionLost(self, reason) self.proc.childConnectionLost(self.name, reason) class ProcessReader(abstract.FileDescriptor): """ ProcessReader I am a selectable representation of a process's output pipe, such as stdout and stderr. """ connected = 1 def __init__(self, reactor, proc, name, fileno): """ Initialize, specifying a process to connect to. """ abstract.FileDescriptor.__init__(self, reactor) fdesc.setNonBlocking(fileno) self.proc = proc self.name = name self.fd = fileno self.startReading() def fileno(self): """ Return the fileno() of my process's stderr. """ return self.fd def writeSomeData(self, data): # the only time this is actually called is after .loseConnection Any # actual write attempt would fail, so we must avoid that. This hack # allows us to use .loseConnection on both readers and writers. assert data == "" return CONNECTION_LOST def doRead(self): """ This is called when the pipe becomes readable. """ return fdesc.readFromFD(self.fd, self.dataReceived) def dataReceived(self, data): self.proc.childDataReceived(self.name, data) def loseConnection(self): if self.connected and not self.disconnecting: self.disconnecting = 1 self.stopReading() self.reactor.callLater(0, self.connectionLost, failure.Failure(CONNECTION_DONE)) def connectionLost(self, reason): """ Close my end of the pipe, signal the Process (which signals the ProcessProtocol). """ abstract.FileDescriptor.connectionLost(self, reason) self.proc.childConnectionLost(self.name, reason) class _BaseProcess(BaseProcess, object): """ Base class for Process and PTYProcess. """ status = None pid = None def reapProcess(self): """ Try to reap a process (without blocking) via waitpid. This is called when sigchild is caught or a Process object loses its "connection" (stdout is closed) This ought to result in reaping all zombie processes, since it will be called twice as often as it needs to be. (Unfortunately, this is a slightly experimental approach, since UNIX has no way to be really sure that your process is going to go away w/o blocking. I don't want to block.) """ try: try: pid, status = os.waitpid(self.pid, os.WNOHANG) except OSError, e: if e.errno == errno.ECHILD: # no child process pid = None else: raise except: log.msg('Failed to reap %d:' % self.pid) log.err() pid = None if pid: self.processEnded(status) unregisterReapProcessHandler(pid, self) def _getReason(self, status): exitCode = sig = None if os.WIFEXITED(status): exitCode = os.WEXITSTATUS(status) else: sig = os.WTERMSIG(status) if exitCode or sig: return error.ProcessTerminated(exitCode, sig, status) return error.ProcessDone(status) def signalProcess(self, signalID): """ Send the given signal C{signalID} to the process. It'll translate a few signals ('HUP', 'STOP', 'INT', 'KILL', 'TERM') from a string representation to its int value, otherwise it'll pass directly the value provided @type signalID: C{str} or C{int} """ if signalID in ('HUP', 'STOP', 'INT', 'KILL', 'TERM'): signalID = getattr(signal, 'SIG%s' % (signalID,)) if self.pid is None: raise ProcessExitedAlready() try: os.kill(self.pid, signalID) except OSError, e: if e.errno == errno.ESRCH: raise ProcessExitedAlready() else: raise def _resetSignalDisposition(self): # The Python interpreter ignores some signals, and our child # process will inherit that behaviour. To have a child process # that responds to signals normally, we need to reset our # child process's signal handling (just) after we fork and # before we execvpe. for signalnum in range(1, signal.NSIG): if signal.getsignal(signalnum) == signal.SIG_IGN: # Reset signal handling to the default signal.signal(signalnum, signal.SIG_DFL) def _fork(self, path, uid, gid, executable, args, environment, **kwargs): """ Fork and then exec sub-process. @param path: the path where to run the new process. @type path: C{str} @param uid: if defined, the uid used to run the new process. @type uid: C{int} @param gid: if defined, the gid used to run the new process. @type gid: C{int} @param executable: the executable to run in a new process. @type executable: C{str} @param args: arguments used to create the new process. @type args: C{list}. @param environment: environment used for the new process. @type environment: C{dict}. @param kwargs: keyword arguments to L{_setupChild} method. """ collectorEnabled = gc.isenabled() gc.disable() try: self.pid = os.fork() except: # Still in the parent process if collectorEnabled: gc.enable() raise else: if self.pid == 0: # pid is 0 in the child process # do not put *ANY* code outside the try block. The child process # must either exec or _exit. If it gets outside this block (due # to an exception that is not handled here, but which might be # handled higher up), there will be two copies of the parent # running in parallel, doing all kinds of damage. # After each change to this code, review it to make sure there # are no exit paths. try: # Stop debugging. If I am, I don't care anymore. sys.settrace(None) self._setupChild(**kwargs) self._execChild( path, uid, gid, executable, args, environment) except: # If there are errors, bail and try to write something # descriptive to stderr. # XXX: The parent's stderr isn't necessarily fd 2 anymore, or # even still available # XXXX: however even libc assumes write(2, err) is a useful # thing to attempt try: stderr = os.fdopen(2, 'w') stderr.write("Upon execvpe %s %s in environment %s\n:" % (executable, str(args), "id %s" % id(environment))) traceback.print_exc(file=stderr) stderr.flush() for fd in range(3): os.close(fd) except: pass # make *sure* the child terminates # Did you read the comment about not adding code here? os._exit(1) # we are now in parent process if collectorEnabled: gc.enable() self.status = -1 # this records the exit status of the child def _setupChild(self, *args, **kwargs): """ Setup the child process. Override in subclasses. """ raise NotImplementedError() def _execChild(self, path, uid, gid, executable, args, environment): """ The exec() which is done in the forked child. """ if path: os.chdir(path) if uid is not None or gid is not None: if uid is None: uid = os.geteuid() if gid is None: gid = os.getegid() # set the UID before I actually exec the process os.setuid(0) os.setgid(0) switchUID(uid, gid) os.execvpe(executable, args, environment) def __repr__(self): """ String representation of a process. """ return "<%s pid=%s status=%s>" % (self.__class__.__name__, self.pid, self.status) class _FDDetector(object): """ This class contains the logic necessary to decide which of the available system techniques should be used to detect the open file descriptors for the current process. The chosen technique gets monkey-patched into the _listOpenFDs method of this class so that the detection only needs to occur once. @ivars listdir: The implementation of listdir to use. This gets overwritten by the test cases. @ivars getpid: The implementation of getpid to use, returns the PID of the running process. @ivars openfile: The implementation of open() to use, by default the Python builtin. """ # So that we can unit test this listdir = os.listdir getpid = os.getpid openfile = open def __init__(self): self._implementations = [ self._procFDImplementation, self._devFDImplementation, self._fallbackFDImplementation] def _listOpenFDs(self): """ Return an iterable of file descriptors which I{may} be open in this process. This will try to return the fewest possible descriptors without missing any. """ self._listOpenFDs = self._getImplementation() return self._listOpenFDs() def _getImplementation(self): """ Pick a method which gives correct results for C{_listOpenFDs} in this runtime environment. This involves a lot of very platform-specific checks, some of which may be relatively expensive. Therefore the returned method should be saved and re-used, rather than always calling this method to determine what it is. See the implementation for the details of how a method is selected. """ for impl in self._implementations: try: before = impl() except: continue try: fp = self.openfile("/dev/null", "r") after = impl() finally: fp.close() if before != after: return impl # If no implementation can detect the newly opened file above, then just # return the last one. The last one should therefore always be one # which makes a simple static guess which includes all possible open # file descriptors, but perhaps also many other values which do not # correspond to file descriptors. For example, the scheme implemented # by _fallbackFDImplementation is suitable to be the last entry. return impl def _devFDImplementation(self): """ Simple implementation for systems where /dev/fd actually works. See: http://www.freebsd.org/cgi/man.cgi?fdescfs """ dname = "/dev/fd" result = [int(fd) for fd in self.listdir(dname)] return result def _procFDImplementation(self): """ Simple implementation for systems where /proc/pid/fd exists (we assume it works). """ dname = "/proc/%d/fd" % (self.getpid(),) return [int(fd) for fd in self.listdir(dname)] def _fallbackFDImplementation(self): """ Fallback implementation where either the resource module can inform us about the upper bound of how many FDs to expect, or where we just guess a constant maximum if there is no resource module. All possible file descriptors from 0 to that upper bound are returned with no attempt to exclude invalid file descriptor values. """ try: import resource except ImportError: maxfds = 1024 else: # OS-X reports 9223372036854775808. That's a lot of fds to close. # OS-X should get the /dev/fd implementation instead, so mostly # this check probably isn't necessary. maxfds = min(1024, resource.getrlimit(resource.RLIMIT_NOFILE)[1]) return range(maxfds) detector = _FDDetector() def _listOpenFDs(): """ Use the global detector object to figure out which FD implementation to use. """ return detector._listOpenFDs() class Process(_BaseProcess): """ An operating-system Process. This represents an operating-system process with arbitrary input/output pipes connected to it. Those pipes may represent standard input, standard output, and standard error, or any other file descriptor. On UNIX, this is implemented using fork(), exec(), pipe() and fcntl(). These calls may not exist elsewhere so this code is not cross-platform. (also, windows can only select on sockets...) """ implements(IProcessTransport) debug = False debug_child = False status = -1 pid = None processWriterFactory = ProcessWriter processReaderFactory = ProcessReader def __init__(self, reactor, executable, args, environment, path, proto, uid=None, gid=None, childFDs=None): """ Spawn an operating-system process. This is where the hard work of disconnecting all currently open files / forking / executing the new process happens. (This is executed automatically when a Process is instantiated.) This will also run the subprocess as a given user ID and group ID, if specified. (Implementation Note: this doesn't support all the arcane nuances of setXXuid on UNIX: it will assume that either your effective or real UID is 0.) """ if not proto: assert 'r' not in childFDs.values() assert 'w' not in childFDs.values() _BaseProcess.__init__(self, proto) self.pipes = {} # keys are childFDs, we can sense them closing # values are ProcessReader/ProcessWriters helpers = {} # keys are childFDs # values are parentFDs if childFDs is None: childFDs = {0: "w", # we write to the child's stdin 1: "r", # we read from their stdout 2: "r", # and we read from their stderr } debug = self.debug if debug: print "childFDs", childFDs _openedPipes = [] def pipe(): r, w = os.pipe() _openedPipes.extend([r, w]) return r, w # fdmap.keys() are filenos of pipes that are used by the child. fdmap = {} # maps childFD to parentFD try: for childFD, target in childFDs.items(): if debug: print "[%d]" % childFD, target if target == "r": # we need a pipe that the parent can read from readFD, writeFD = pipe() if debug: print "readFD=%d, writeFD=%d" % (readFD, writeFD) fdmap[childFD] = writeFD # child writes to this helpers[childFD] = readFD # parent reads from this elif target == "w": # we need a pipe that the parent can write to readFD, writeFD = pipe() if debug: print "readFD=%d, writeFD=%d" % (readFD, writeFD) fdmap[childFD] = readFD # child reads from this helpers[childFD] = writeFD # parent writes to this else: assert type(target) == int, '%r should be an int' % (target,) fdmap[childFD] = target # parent ignores this if debug: print "fdmap", fdmap if debug: print "helpers", helpers # the child only cares about fdmap.values() self._fork(path, uid, gid, executable, args, environment, fdmap=fdmap) except: map(os.close, _openedPipes) raise # we are the parent process: self.proto = proto # arrange for the parent-side pipes to be read and written for childFD, parentFD in helpers.items(): os.close(fdmap[childFD]) if childFDs[childFD] == "r": reader = self.processReaderFactory(reactor, self, childFD, parentFD) self.pipes[childFD] = reader if childFDs[childFD] == "w": writer = self.processWriterFactory(reactor, self, childFD, parentFD, forceReadHack=True) self.pipes[childFD] = writer try: # the 'transport' is used for some compatibility methods if self.proto is not None: self.proto.makeConnection(self) except: log.err() # The reactor might not be running yet. This might call back into # processEnded synchronously, triggering an application-visible # callback. That's probably not ideal. The replacement API for # spawnProcess should improve upon this situation. registerReapProcessHandler(self.pid, self) def _setupChild(self, fdmap): """ fdmap[childFD] = parentFD The child wants to end up with 'childFD' attached to what used to be the parent's parentFD. As an example, a bash command run like 'command 2>&1' would correspond to an fdmap of {0:0, 1:1, 2:1}. 'command >foo.txt' would be {0:0, 1:os.open('foo.txt'), 2:2}. This is accomplished in two steps:: 1. close all file descriptors that aren't values of fdmap. This means 0 .. maxfds (or just the open fds within that range, if the platform supports '/proc//fd'). 2. for each childFD:: - if fdmap[childFD] == childFD, the descriptor is already in place. Make sure the CLOEXEC flag is not set, then delete the entry from fdmap. - if childFD is in fdmap.values(), then the target descriptor is busy. Use os.dup() to move it elsewhere, update all fdmap[childFD] items that point to it, then close the original. Then fall through to the next case. - now fdmap[childFD] is not in fdmap.values(), and is free. Use os.dup2() to move it to the right place, then close the original. """ debug = self.debug_child if debug: errfd = sys.stderr errfd.write("starting _setupChild\n") destList = fdmap.values() for fd in _listOpenFDs(): if fd in destList: continue if debug and fd == errfd.fileno(): continue try: os.close(fd) except: pass # at this point, the only fds still open are the ones that need to # be moved to their appropriate positions in the child (the targets # of fdmap, i.e. fdmap.values() ) if debug: print >>errfd, "fdmap", fdmap childlist = fdmap.keys() childlist.sort() for child in childlist: target = fdmap[child] if target == child: # fd is already in place if debug: print >>errfd, "%d already in place" % target fdesc._unsetCloseOnExec(child) else: if child in fdmap.values(): # we can't replace child-fd yet, as some other mapping # still needs the fd it wants to target. We must preserve # that old fd by duping it to a new home. newtarget = os.dup(child) # give it a safe home if debug: print >>errfd, "os.dup(%d) -> %d" % (child, newtarget) os.close(child) # close the original for c, p in fdmap.items(): if p == child: fdmap[c] = newtarget # update all pointers # now it should be available if debug: print >>errfd, "os.dup2(%d,%d)" % (target, child) os.dup2(target, child) # At this point, the child has everything it needs. We want to close # everything that isn't going to be used by the child, i.e. # everything not in fdmap.keys(). The only remaining fds open are # those in fdmap.values(). # Any given fd may appear in fdmap.values() multiple times, so we # need to remove duplicates first. old = [] for fd in fdmap.values(): if not fd in old: if not fd in fdmap.keys(): old.append(fd) if debug: print >>errfd, "old", old for fd in old: os.close(fd) self._resetSignalDisposition() def writeToChild(self, childFD, data): self.pipes[childFD].write(data) def closeChildFD(self, childFD): # for writer pipes, loseConnection tries to write the remaining data # out to the pipe before closing it # if childFD is not in the list of pipes, assume that it is already # closed if childFD in self.pipes: self.pipes[childFD].loseConnection() def pauseProducing(self): for p in self.pipes.itervalues(): if isinstance(p, ProcessReader): p.stopReading() def resumeProducing(self): for p in self.pipes.itervalues(): if isinstance(p, ProcessReader): p.startReading() # compatibility def closeStdin(self): """ Call this to close standard input on this process. """ self.closeChildFD(0) def closeStdout(self): self.closeChildFD(1) def closeStderr(self): self.closeChildFD(2) def loseConnection(self): self.closeStdin() self.closeStderr() self.closeStdout() def write(self, data): """ Call this to write to standard input on this process. NOTE: This will silently lose data if there is no standard input. """ if 0 in self.pipes: self.pipes[0].write(data) def registerProducer(self, producer, streaming): """ Call this to register producer for standard input. If there is no standard input producer.stopProducing() will be called immediately. """ if 0 in self.pipes: self.pipes[0].registerProducer(producer, streaming) else: producer.stopProducing() def unregisterProducer(self): """ Call this to unregister producer for standard input.""" if 0 in self.pipes: self.pipes[0].unregisterProducer() def writeSequence(self, seq): """ Call this to write to standard input on this process. NOTE: This will silently lose data if there is no standard input. """ if 0 in self.pipes: self.pipes[0].writeSequence(seq) def childDataReceived(self, name, data): self.proto.childDataReceived(name, data) def childConnectionLost(self, childFD, reason): # this is called when one of the helpers (ProcessReader or # ProcessWriter) notices their pipe has been closed os.close(self.pipes[childFD].fileno()) del self.pipes[childFD] try: self.proto.childConnectionLost(childFD) except: log.err() self.maybeCallProcessEnded() def maybeCallProcessEnded(self): # we don't call ProcessProtocol.processEnded until: # the child has terminated, AND # all writers have indicated an error status, AND # all readers have indicated EOF # This insures that we've gathered all output from the process. if self.pipes: return if not self.lostProcess: self.reapProcess() return _BaseProcess.maybeCallProcessEnded(self) class PTYProcess(abstract.FileDescriptor, _BaseProcess): """ An operating-system Process that uses PTY support. """ implements(IProcessTransport) status = -1 pid = None def __init__(self, reactor, executable, args, environment, path, proto, uid=None, gid=None, usePTY=None): """ Spawn an operating-system process. This is where the hard work of disconnecting all currently open files / forking / executing the new process happens. (This is executed automatically when a Process is instantiated.) This will also run the subprocess as a given user ID and group ID, if specified. (Implementation Note: this doesn't support all the arcane nuances of setXXuid on UNIX: it will assume that either your effective or real UID is 0.) """ if pty is None and not isinstance(usePTY, (tuple, list)): # no pty module and we didn't get a pty to use raise NotImplementedError( "cannot use PTYProcess on platforms without the pty module.") abstract.FileDescriptor.__init__(self, reactor) _BaseProcess.__init__(self, proto) if isinstance(usePTY, (tuple, list)): masterfd, slavefd, ttyname = usePTY else: masterfd, slavefd = pty.openpty() ttyname = os.ttyname(slavefd) try: self._fork(path, uid, gid, executable, args, environment, masterfd=masterfd, slavefd=slavefd) except: if not isinstance(usePTY, (tuple, list)): os.close(masterfd) os.close(slavefd) raise # we are now in parent process: os.close(slavefd) fdesc.setNonBlocking(masterfd) self.fd = masterfd self.startReading() self.connected = 1 self.status = -1 try: self.proto.makeConnection(self) except: log.err() registerReapProcessHandler(self.pid, self) def _setupChild(self, masterfd, slavefd): """ Set up child process after C{fork()} but before C{exec()}. This involves: - closing C{masterfd}, since it is not used in the subprocess - creating a new session with C{os.setsid} - changing the controlling terminal of the process (and the new session) to point at C{slavefd} - duplicating C{slavefd} to standard input, output, and error - closing all other open file descriptors (according to L{_listOpenFDs}) - re-setting all signal handlers to C{SIG_DFL} @param masterfd: The master end of a PTY file descriptors opened with C{openpty}. @type masterfd: L{int} @param slavefd: The slave end of a PTY opened with C{openpty}. @type slavefd: L{int} """ os.close(masterfd) os.setsid() fcntl.ioctl(slavefd, termios.TIOCSCTTY, '') for fd in range(3): if fd != slavefd: os.close(fd) os.dup2(slavefd, 0) # stdin os.dup2(slavefd, 1) # stdout os.dup2(slavefd, 2) # stderr for fd in _listOpenFDs(): if fd > 2: try: os.close(fd) except: pass self._resetSignalDisposition() # PTYs do not have stdin/stdout/stderr. They only have in and out, just # like sockets. You cannot close one without closing off the entire PTY. def closeStdin(self): pass def closeStdout(self): pass def closeStderr(self): pass def doRead(self): """ Called when my standard output stream is ready for reading. """ return fdesc.readFromFD( self.fd, lambda data: self.proto.childDataReceived(1, data)) def fileno(self): """ This returns the file number of standard output on this process. """ return self.fd def maybeCallProcessEnded(self): # two things must happen before we call the ProcessProtocol's # processEnded method. 1: the child process must die and be reaped # (which calls our own processEnded method). 2: the child must close # their stdin/stdout/stderr fds, causing the pty to close, causing # our connectionLost method to be called. #2 can also be triggered # by calling .loseConnection(). if self.lostProcess == 2: _BaseProcess.maybeCallProcessEnded(self) def connectionLost(self, reason): """ I call this to clean up when one or all of my connections has died. """ abstract.FileDescriptor.connectionLost(self, reason) os.close(self.fd) self.lostProcess += 1 self.maybeCallProcessEnded() def writeSomeData(self, data): """ Write some data to the open process. """ return fdesc.writeToFD(self.fd, data)