/usr/share/pyshared/MoinMoin/util/SubProcess.py is in python-moinmoin 1.9.3-1ubuntu2.3.
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Enhanced subprocess.Popen subclass, supporting:
* .communicate() with timeout
* kill/terminate/send_signal (like in Py 2.6) for Py 2.4 / 2.5
Sample usage:
out, err = Popen(...).communicate(input, timeout=300)
"""
import os
import subprocess
import threading
import signal
if subprocess.mswindows:
try:
# Python >= 2.6 should have this:
from _subprocess import TerminateProcess
except ImportError:
# otherwise you need win32 extensions:
from win32process import TerminateProcess
else:
import select
import errno
class Popen(subprocess.Popen):
# send_signal, terminate, kill copied from Python 2.6
# (we want to support Python >= 2.4)
if subprocess.mswindows:
def send_signal(self, sig):
"""Send a signal to the process
"""
if sig == signal.SIGTERM:
self.terminate()
else:
raise ValueError("Only SIGTERM is supported on Windows")
def terminate(self):
"""Terminates the process
"""
TerminateProcess(self._handle, 1)
kill = terminate
else: # POSIX
def send_signal(self, sig):
"""Send a signal to the process
"""
os.kill(self.pid, sig)
def terminate(self):
"""Terminate the process with SIGTERM
"""
self.send_signal(signal.SIGTERM)
def kill(self):
"""Kill the process with SIGKILL
"""
self.send_signal(signal.SIGKILL)
def communicate(self, input=None, timeout=None):
"""Interact with process: Send data to stdin. Read data from
stdout and stderr, until end-of-file is reached. Wait for
process to terminate. The optional input argument should be a
string to be sent to the child process, or None, if no data
should be sent to the child.
communicate() returns a tuple (stdout, stderr)."""
self.timeout = timeout
# Optimization: If we are only using one pipe, or no pipe at
# all, using select() or threads is unnecessary.
if [self.stdin, self.stdout, self.stderr].count(None) >= 2:
stdout = None
stderr = None
if self.stdin:
if input:
self._fo_write_no_intr(self.stdin, input)
self.stdin.close()
elif self.stdout:
stdout = self._fo_read_no_intr(self.stdout)
self.stdout.close()
elif self.stderr:
stderr = self._fo_read_no_intr(self.stderr)
self.stderr.close()
self.wait()
return (stdout, stderr)
return self._communicate(input)
if subprocess.mswindows:
def _communicate(self, input):
stdout = None # Return
stderr = None # Return
if self.stdout:
stdout = []
stdout_thread = threading.Thread(target=self._readerthread,
args=(self.stdout, stdout))
stdout_thread.setDaemon(True)
stdout_thread.start()
if self.stderr:
stderr = []
stderr_thread = threading.Thread(target=self._readerthread,
args=(self.stderr, stderr))
stderr_thread.setDaemon(True)
stderr_thread.start()
if self.stdin:
if input is not None:
self.stdin.write(input)
self.stdin.close()
if self.stdout:
stdout_thread.join(self.timeout)
if self.stderr:
stderr_thread.join(self.timeout)
# if the threads are still alive, that means the thread join timed out
timed_out = (self.stdout and stdout_thread.isAlive() or
self.stderr and stderr_thread.isAlive())
if timed_out:
self.kill()
else:
self.wait()
# All data exchanged. Translate lists into strings.
if stdout is not None:
stdout = stdout[0]
if stderr is not None:
stderr = stderr[0]
# Translate newlines, if requested. We cannot let the file
# object do the translation: It is based on stdio, which is
# impossible to combine with select (unless forcing no
# buffering).
if self.universal_newlines and hasattr(file, 'newlines'):
if stdout:
stdout = self._translate_newlines(stdout)
if stderr:
stderr = self._translate_newlines(stderr)
return (stdout, stderr)
else: # POSIX
def _communicate(self, input):
timed_out = False
read_set = []
write_set = []
stdout = None # Return
stderr = None # Return
if self.stdin:
# Flush stdio buffer. This might block, if the user has
# been writing to .stdin in an uncontrolled fashion.
self.stdin.flush()
if input:
write_set.append(self.stdin)
else:
self.stdin.close()
if self.stdout:
read_set.append(self.stdout)
stdout = []
if self.stderr:
read_set.append(self.stderr)
stderr = []
input_offset = 0
while read_set or write_set:
try:
rlist, wlist, xlist = select.select(read_set, write_set, [], self.timeout)
except select.error, e:
if e.args[0] == errno.EINTR:
continue
raise
timed_out = not (rlist or wlist or xlist)
if timed_out:
break
if self.stdin in wlist:
# When select has indicated that the file is writable,
# we can write up to PIPE_BUF bytes without risk
# blocking. POSIX defines PIPE_BUF >= 512
chunk = input[input_offset:input_offset + 512]
bytes_written = os.write(self.stdin.fileno(), chunk)
input_offset += bytes_written
if input_offset >= len(input):
self.stdin.close()
write_set.remove(self.stdin)
if self.stdout in rlist:
data = os.read(self.stdout.fileno(), 1024)
if data == "":
self.stdout.close()
read_set.remove(self.stdout)
stdout.append(data)
if self.stderr in rlist:
data = os.read(self.stderr.fileno(), 1024)
if data == "":
self.stderr.close()
read_set.remove(self.stderr)
stderr.append(data)
# All data exchanged. Translate lists into strings.
if stdout is not None:
stdout = ''.join(stdout)
if stderr is not None:
stderr = ''.join(stderr)
# Translate newlines, if requested. We cannot let the file
# object do the translation: It is based on stdio, which is
# impossible to combine with select (unless forcing no
# buffering).
if self.universal_newlines and hasattr(file, 'newlines'):
if stdout:
stdout = self._translate_newlines(stdout)
if stderr:
stderr = self._translate_newlines(stderr)
if timed_out:
self.kill()
else:
self.wait()
return (stdout, stderr)
def exec_cmd(cmd, input=None, timeout=None):
p = Popen(cmd, shell=True,
close_fds=not subprocess.mswindows,
bufsize=1024,
stdin=subprocess.PIPE,
stdout=subprocess.PIPE,
stderr=subprocess.PIPE)
data, errors = p.communicate(input, timeout=timeout)
return data, errors, p.returncode
if __name__ == '__main__':
print exec_cmd("python", "import time ; time.sleep(20) ; print 'never!' ;", timeout=10)
print exec_cmd("python", "import time ; time.sleep(20) ; print '20s gone' ;")
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