def _close_fds(self, keep):
# `keep` is a set of fds, so we
# use os.closerange from 3 to min(keep)
# and then from max(keep + 1) to MAXFD and
# loop through filling in the gaps.
# Under new python versions, we need to explicitly set
# passed fds to be inheritable or they will go away on exec
if hasattr(os, 'set_inheritable'):
set_inheritable = os.set_inheritable
else:
set_inheritable = lambda i, v: True
if hasattr(os, 'closerange'):
keep = sorted(keep)
min_keep = min(keep)
max_keep = max(keep)
os.closerange(3, min_keep)
os.closerange(max_keep + 1, MAXFD)
for i in xrange(min_keep, max_keep):
if i in keep:
set_inheritable(i, True)
continue
try:
os.close(i)
except:
pass
else:
for i in xrange(3, MAXFD):
if i in keep:
set_inheritable(i, True)
continue
try:
os.close(i)
except:
pass
def _close_fds(self, keep):
# `keep` is a set of fds, so we
# use os.closerange from 3 to min(keep)
# and then from max(keep + 1) to MAXFD and
# loop through filling in the gaps.
# Under new python versions, we need to explicitly set
# passed fds to be inheritable or they will go away on exec
if hasattr(os, 'set_inheritable'):
set_inheritable = os.set_inheritable
else:
set_inheritable = lambda i, v: True
if hasattr(os, 'closerange'):
keep = sorted(keep)
min_keep = min(keep)
max_keep = max(keep)
os.closerange(3, min_keep)
os.closerange(max_keep + 1, MAXFD)
for i in xrange(min_keep, max_keep):
if i in keep:
set_inheritable(i, True)
continue
try:
os.close(i)
except:
pass
else:
for i in xrange(3, MAXFD):
if i in keep:
set_inheritable(i, True)
continue
try:
os.close(i)
except:
pass
def _do_read(self):
for _ in xrange(self.max_accept):
if self.full():
self.stop_accepting()
return
try:
args = self.do_read()
self.delay = self.min_delay
if not args:
return
except:
self.loop.handle_error(self, *sys.exc_info())
ex = sys.exc_info()[1]
if self.is_fatal_error(ex):
self.close()
sys.stderr.write("ERROR: %s failed with %s\n" % (self, str(ex) or repr(ex)))
return
if self.delay >= 0:
self.stop_accepting()
self._timer = self.loop.timer(self.delay)
self._timer.start(self._start_accepting_if_started)
self.delay = min(self.max_delay, self.delay * 2)
break
else:
try:
self.do_handle(*args)
except:
self.loop.handle_error((args[1:], self), *sys.exc_info())
if self.delay >= 0:
self.stop_accepting()
self._timer = self.loop.timer(self.delay)
self._timer.start(self._start_accepting_if_started)
self.delay = min(self.max_delay, self.delay * 2)
break
def _do_read(self):
for _ in xrange(self.max_accept):
if self.full():
self.stop_accepting()
return
try:
args = self.do_read()
self.delay = self.min_delay
if not args:
return
except:
self.loop.handle_error(self, *sys.exc_info())
ex = sys.exc_info()[1]
if self.is_fatal_error(ex):
self.close()
sys.stderr.write('ERROR: %s failed with %s\n' %
(self, str(ex) or repr(ex)))
return
if self.delay >= 0:
self.stop_accepting()
self._timer = self.loop.timer(self.delay)
self._timer.start(self._start_accepting_if_started)
self.delay = min(self.max_delay, self.delay * 2)
break
else:
try:
self.do_handle(*args)
except:
self.loop.handle_error((args[1:], self), *sys.exc_info())
if self.delay >= 0:
self.stop_accepting()
self._timer = self.loop.timer(self.delay)
self._timer.start(self._start_accepting_if_started)
self.delay = min(self.max_delay, self.delay * 2)
break
def _close_fds(self, but):
if hasattr(os, 'closerange'):
os.closerange(3, but)
os.closerange(but + 1, MAXFD)
else:
for i in xrange(3, MAXFD):
if i == but:
continue
try:
os.close(i)
except:
pass
def _close_fds(self, but):
if hasattr(os, 'closerange'):
os.closerange(3, but)
os.closerange(but + 1, MAXFD)
else:
for i in xrange(3, MAXFD):
if i == but:
continue
try:
os.close(i)
except:
pass
def _execute_child(self, args, executable, preexec_fn, close_fds,
pass_fds, cwd, env, universal_newlines, startupinfo,
creationflags, shell, p2cread, p2cwrite, c2pread,
c2pwrite, errread, errwrite, restore_signals,
start_new_session):
"""Execute program (POSIX version)"""
if PY3 and isinstance(args, (str, bytes)):
args = [args]
elif not PY3 and isinstance(args, string_types):
args = [args]
else:
args = list(args)
if shell:
args = ["/bin/sh", "-c"] + args
if executable:
args[0] = executable
if executable is None:
executable = args[0]
self._loop.install_sigchld()
# For transferring possible exec failure from child to parent
# The first char specifies the exception type: 0 means
# OSError, 1 means some other error.
errpipe_read, errpipe_write = self.pipe_cloexec()
# errpipe_write must not be in the standard io 0, 1, or 2 fd range.
low_fds_to_close = []
while errpipe_write < 3:
low_fds_to_close.append(errpipe_write)
errpipe_write = os.dup(errpipe_write)
for low_fd in low_fds_to_close:
os.close(low_fd)
try:
try:
gc_was_enabled = gc.isenabled()
# Disable gc to avoid bug where gc -> file_dealloc ->
# write to stderr -> hang. http://bugs.python.org/issue1336
gc.disable()
try:
self.pid = fork_and_watch(self._on_child, self._loop,
True, fork)
except:
if gc_was_enabled:
gc.enable()
raise
if self.pid == 0:
# Child
try:
# Close parent's pipe ends
if p2cwrite is not None:
os.close(p2cwrite)
if c2pread is not None:
os.close(c2pread)
if errread is not None:
os.close(errread)
os.close(errpipe_read)
# When duping fds, if there arises a situation
# where one of the fds is either 0, 1 or 2, it
# is possible that it is overwritten (#12607).
if c2pwrite == 0:
c2pwrite = os.dup(c2pwrite)
if errwrite == 0 or errwrite == 1:
errwrite = os.dup(errwrite)
# Dup fds for child
def _dup2(a, b):
# dup2() removes the CLOEXEC flag but
# we must do it ourselves if dup2()
# would be a no-op (issue #10806).
if a == b:
self._set_cloexec_flag(a, False)
elif a is not None:
os.dup2(a, b)
self._remove_nonblock_flag(b)
_dup2(p2cread, 0)
_dup2(c2pwrite, 1)
_dup2(errwrite, 2)
# Close pipe fds. Make sure we don't close the
# same fd more than once, or standard fds.
closed = set([None])
for fd in [p2cread, c2pwrite, errwrite]:
if fd not in closed and fd > 2:
os.close(fd)
closed.add(fd)
if cwd is not None:
os.chdir(cwd)
if preexec_fn:
preexec_fn()
# Close all other fds, if asked for. This must be done
# after preexec_fn runs.
if close_fds:
fds_to_keep = set(pass_fds)
fds_to_keep.add(errpipe_write)
self._close_fds(fds_to_keep)
elif hasattr(os, 'get_inheritable'):
# close_fds was false, and we're on
# Python 3.4 or newer, so "all file
# descriptors except standard streams
# are closed, and inheritable handles
# are only inherited if the close_fds
# parameter is False."
for i in xrange(3, MAXFD):
try:
if i == errpipe_write or os.get_inheritable(
i):
continue
os.close(i)
except:
pass
if restore_signals:
# restore the documented signals back to sig_dfl;
# not all will be defined on every platform
for sig in 'SIGPIPE', 'SIGXFZ', 'SIGXFSZ':
sig = getattr(signal, sig, None)
if sig is not None:
signal.signal(sig, signal.SIG_DFL)
if start_new_session:
os.setsid()
if env is None:
os.execvp(executable, args)
else:
os.execvpe(executable, args, env)
except:
exc_type, exc_value, tb = sys.exc_info()
# Save the traceback and attach it to the exception object
exc_lines = traceback.format_exception(
exc_type, exc_value, tb)
exc_value.child_traceback = ''.join(exc_lines)
os.write(errpipe_write, pickle.dumps(exc_value))
finally:
# Make sure that the process exits no matter what.
# The return code does not matter much as it won't be
# reported to the application
os._exit(1)
# Parent
self._child_created = True
if gc_was_enabled:
gc.enable()
finally:
# be sure the FD is closed no matter what
os.close(errpipe_write)
# self._devnull is not always defined.
devnull_fd = getattr(self, '_devnull', None)
if p2cread is not None and p2cwrite is not None and p2cread != devnull_fd:
os.close(p2cread)
if c2pwrite is not None and c2pread is not None and c2pwrite != devnull_fd:
os.close(c2pwrite)
if errwrite is not None and errread is not None and errwrite != devnull_fd:
os.close(errwrite)
if devnull_fd is not None:
os.close(devnull_fd)
# Prevent a double close of these fds from __init__ on error.
self._closed_child_pipe_fds = True
# Wait for exec to fail or succeed; possibly raising exception
errpipe_read = FileObject(errpipe_read, 'rb')
data = errpipe_read.read()
finally:
if hasattr(errpipe_read, 'close'):
errpipe_read.close()
else:
os.close(errpipe_read)
if data != b"":
self.wait()
child_exception = pickle.loads(data)
for fd in (p2cwrite, c2pread, errread):
if fd is not None:
os.close(fd)
raise child_exception
def _execute_child(self, args, executable, preexec_fn, close_fds,
pass_fds, cwd, env, universal_newlines,
startupinfo, creationflags, shell,
p2cread, p2cwrite,
c2pread, c2pwrite,
errread, errwrite,
restore_signals, start_new_session):
"""Execute program (POSIX version)"""
if PY3 and isinstance(args, (str, bytes)):
args = [args]
elif not PY3 and isinstance(args, string_types):
args = [args]
else:
args = list(args)
if shell:
args = ["/bin/sh", "-c"] + args
if executable:
args[0] = executable
if executable is None:
executable = args[0]
self._loop.install_sigchld()
# For transferring possible exec failure from child to parent
# The first char specifies the exception type: 0 means
# OSError, 1 means some other error.
errpipe_read, errpipe_write = self.pipe_cloexec()
# errpipe_write must not be in the standard io 0, 1, or 2 fd range.
low_fds_to_close = []
while errpipe_write < 3:
low_fds_to_close.append(errpipe_write)
errpipe_write = os.dup(errpipe_write)
for low_fd in low_fds_to_close:
os.close(low_fd)
try:
try:
gc_was_enabled = gc.isenabled()
# Disable gc to avoid bug where gc -> file_dealloc ->
# write to stderr -> hang. http://bugs.python.org/issue1336
gc.disable()
try:
self.pid = fork_and_watch(self._on_child, self._loop, True, fork)
except:
if gc_was_enabled:
gc.enable()
raise
if self.pid == 0:
# Child
try:
# Close parent's pipe ends
if p2cwrite is not None:
os.close(p2cwrite)
if c2pread is not None:
os.close(c2pread)
if errread is not None:
os.close(errread)
os.close(errpipe_read)
# When duping fds, if there arises a situation
# where one of the fds is either 0, 1 or 2, it
# is possible that it is overwritten (#12607).
if c2pwrite == 0:
c2pwrite = os.dup(c2pwrite)
if errwrite == 0 or errwrite == 1:
errwrite = os.dup(errwrite)
# Dup fds for child
def _dup2(a, b):
# dup2() removes the CLOEXEC flag but
# we must do it ourselves if dup2()
# would be a no-op (issue #10806).
if a == b:
self._set_cloexec_flag(a, False)
elif a is not None:
os.dup2(a, b)
self._remove_nonblock_flag(b)
_dup2(p2cread, 0)
_dup2(c2pwrite, 1)
_dup2(errwrite, 2)
# Close pipe fds. Make sure we don't close the
# same fd more than once, or standard fds.
closed = set([None])
for fd in [p2cread, c2pwrite, errwrite]:
if fd not in closed and fd > 2:
os.close(fd)
closed.add(fd)
if cwd is not None:
os.chdir(cwd)
if preexec_fn:
preexec_fn()
# Close all other fds, if asked for. This must be done
# after preexec_fn runs.
if close_fds:
fds_to_keep = set(pass_fds)
fds_to_keep.add(errpipe_write)
self._close_fds(fds_to_keep)
elif hasattr(os, 'get_inheritable'):
# close_fds was false, and we're on
# Python 3.4 or newer, so "all file
# descriptors except standard streams
# are closed, and inheritable handles
# are only inherited if the close_fds
# parameter is False."
for i in xrange(3, MAXFD):
try:
if i == errpipe_write or os.get_inheritable(i):
continue
os.close(i)
except:
pass
if restore_signals:
# restore the documented signals back to sig_dfl;
# not all will be defined on every platform
for sig in 'SIGPIPE', 'SIGXFZ', 'SIGXFSZ':
sig = getattr(signal, sig, None)
if sig is not None:
signal.signal(sig, signal.SIG_DFL)
if start_new_session:
os.setsid()
if env is None:
os.execvp(executable, args)
else:
os.execvpe(executable, args, env)
except:
exc_type, exc_value, tb = sys.exc_info()
# Save the traceback and attach it to the exception object
exc_lines = traceback.format_exception(exc_type,
exc_value,
tb)
exc_value.child_traceback = ''.join(exc_lines)
os.write(errpipe_write, pickle.dumps(exc_value))
finally:
# Make sure that the process exits no matter what.
# The return code does not matter much as it won't be
# reported to the application
os._exit(1)
# Parent
self._child_created = True
if gc_was_enabled:
gc.enable()
finally:
# be sure the FD is closed no matter what
os.close(errpipe_write)
# self._devnull is not always defined.
devnull_fd = getattr(self, '_devnull', None)
if p2cread is not None and p2cwrite is not None and p2cread != devnull_fd:
os.close(p2cread)
if c2pwrite is not None and c2pread is not None and c2pwrite != devnull_fd:
os.close(c2pwrite)
if errwrite is not None and errread is not None and errwrite != devnull_fd:
os.close(errwrite)
if devnull_fd is not None:
os.close(devnull_fd)
# Prevent a double close of these fds from __init__ on error.
self._closed_child_pipe_fds = True
# Wait for exec to fail or succeed; possibly raising exception
errpipe_read = FileObject(errpipe_read, 'rb')
data = errpipe_read.read()
finally:
if hasattr(errpipe_read, 'close'):
errpipe_read.close()
else:
os.close(errpipe_read)
if data != b"":
self.wait()
child_exception = pickle.loads(data)
for fd in (p2cwrite, c2pread, errread):
if fd is not None:
os.close(fd)
raise child_exception