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# -*- test-case-name: twisted.test.test_process -*-
# Copyright (c) 2001-2010 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 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
# 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()
os.kill(self.pid, signalID)
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.
"""
settingUID = (uid is not None) or (gid is not None)
if settingUID:
curegid = os.getegid()
currgid = os.getgid()
cureuid = os.geteuid()
curruid = os.getuid()
if uid is None:
uid = cureuid
if gid is None:
gid = curegid
# prepare to change UID in subprocess
os.setuid(0)
os.setgid(0)
collectorEnabled = gc.isenabled()
gc.disable()
try:
self.pid = os.fork()
except:
# Still in the parent process
if settingUID:
os.setregid(currgid, curegid)
os.setreuid(curruid, cureuid)
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, settingUID, 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 settingUID:
os.setregid(currgid, curegid)
os.setreuid(curruid, cureuid)
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, settingUID, uid, gid,
executable, args, environment):
"""
The exec() which is done in the forked child.
"""
if path:
os.chdir(path)
# set the UID before I actually exec the process
if settingUID:
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 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...)
"""
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.
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()
try:
import resource
maxfds = resource.getrlimit(resource.RLIMIT_NOFILE)[1] + 1
# OS-X reports 9223372036854775808. That's a lot of fds to close
if maxfds > 1024:
maxfds = 1024
except:
maxfds = 256
for fd in xrange(maxfds):
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.
"""
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):
"""
Setup child process after fork() but before exec().
"""
os.close(masterfd)
if hasattr(termios, 'TIOCNOTTY'):
try:
fd = os.open("/dev/tty", os.O_RDWR | os.O_NOCTTY)
except OSError:
pass
else:
try:
fcntl.ioctl(fd, termios.TIOCNOTTY, '')
except:
pass
os.close(fd)
os.setsid()
if hasattr(termios, 'TIOCSCTTY'):
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 xrange(3, 256):
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)
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