Error Errno 4 Interrupted System Call

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Python Select Interrupted System Call

Stack Overflow Community Stack Overflow is a community of 4.7 million programmers, just like you, helping each other. Join them; it only takes a minute: python eintr Sign up What is the proper way to handle (in python) IOError: [Errno 4] Interrupted system call, raised by multiprocessing.Queue.get up vote 9 down vote favorite When I use multiprocessing.Queue.get I sometimes get an exception due to EINTR. I know definitely

Errno 4 Interrupted Function Call

that sometimes this happens for no good reason (I open another pane in a tmux buffr), and in such a case I would want to continue working and retry the operation. I can imagine that in some other cases The error would be due to a good reason and I should stop running or fix some error. How can I distinguish the two? Thanks in advance python error-handling queue multiprocessing ioerror share|improve this question asked Jan 3 '13 at 9:36 Shwouchk 9028 python catch interrupted system call you should make sure the queue is not empty before get: if not queue.empty(): queue.get() –Inbar Rose Jan 3 '13 at 9:39 I believe that if the queue is empty, it will just block the call. Won't it? In any I don't think this is the cause of the error. –Shwouchk Jan 3 '13 at 10:26 add a comment| 2 Answers 2 active oldest votes up vote 11 down vote accepted The EINTR error can be returned from many system calls when the application receives a signal while waiting for other input. Typically these signals can be quite benign and already handled by Python, but the underlying system call still ends up being interrupted. When doing C/C++ coding this is one reason why you can't entirely rely on functions like sleep(). The Python libraries sometimes handle this error code internally, but obviously in this case they're not. You might be interested to read this thread which discusses this problem. The general approach to EINTR is to simply handle the error and retry the operation again - this should be a safe thing to do with the get() method on the queue. Something like this could be used, passing the queue as a parameter and replacing the use of the get() method on the queue: import errno def my_queue_get(queue, block=True, timeout=None): while True: try: return queue.get(block, timeout) except IOError, e: if e.errno != errno.EINTR: raise # Now replace instances of queue.get() with my_queue_get(queue), with othe

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Error 4 Interrupted System Call

issue Program aborted with [Errno 4] Interrupted system call #8 Open motoz

Python Signal

opened this Issue Mar 17, 2016 · 4 comments Projects None yet Labels bug Milestone rewrite python exception low level... Assignees No one assigned 2 participants motoz commented Mar 17, 2016 I'm using a periodic signal handler in my program and bumped into this with another socket connection. http://stackoverflow.com/questions/14136195/what-is-the-proper-way-to-handle-in-python-ioerror-errno-4-interrupted-syst Then it occured to me that this could be the cause of the occasional errors I have seen from the pyownet communication. This short program shows the issue: from pyownet import protocol import signal, time def periodic_signal_handler(signum, frame): print 'sig' signal.signal(signal.SIGALRM, periodic_signal_handler) signal.setitimer(signal.ITIMER_REAL, 2, 0.01) p = protocol.proxy('192.168.1.7') while True: p.dir() time.sleep(0.2) typical output: python errnotest.py sig sig sig sig sig sig sig https://github.com/miccoli/pyownet/issues/8 sig Traceback (most recent call last): File "errnotest.py", line 14, in p.dir() File "/usr/local/lib/python2.7/dist-packages/pyownet/protocol.py", line 500, in dir ret, data = self.sendmess(msg, str2bytez(path), flags) File "/usr/local/lib/python2.7/dist-packages/pyownet/protocol.py", line 467, in sendmess raise ConnError(*err.args) pyownet.protocol.ConnError: [Errno 4] Interrupted system call Some background info I found: http://stackoverflow.com/questions/16094618/python-socket-recv-and-signals http://250bpm.com/blog:12 Seems like python does not reastart the syscall on EINTR even though it should, so it has to be handled in the program by looping on the syscall until it ends with something other than EINTR: while True: try: data = s.recv(2048) except socket.error, e: if e.errno != errno.EINTR: raise else: break (Ubuntu 14.04 with python 2.7.6) Owner miccoli commented Mar 17, 2016 This issue is linked to a python "feature" described in PEP 0475. Fortunately this "feature" was declared a bug and corrected in Python 3.5 I plan to keep full support for Python 2.7, so I will fix this issue, but I still have to set a milestone linked to better python version handling. miccoli added the bug label Mar 17, 2016 Owner miccoli commented Mar 17, 2016 Bug confirmed for pyownet ver. 0.9.0 and 0.9.1.dev7 on CPy

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"Interrupted system call" errors on Python 2.4, in a fresh SVN checkout Reported by: TimAllen Owned by: Priority: normal Milestone: Component: core Keywords: easy Cc: spiv, exarkun Branch: Author: Description Apparently this is a regression from #733. From a fresh git svn checkout of r28580 on my Python 2.4-based system, when I run bin/trial twisted/ I get the following errors: =============================================================================== [FAIL]: twisted.internet.test.test_process.PTYProcessTestsBuilder_SelectReactor.test_systemCallUninterruptedByChildExit Traceback (most recent call last): File "/mnt/aquaria/nobackup/home/tim/tmp/Twisted-git/twisted/internet/test/test_process.py", line 219, in test_systemCallUninterruptedByChildExit self.assertEqual(result, ["Foo\n"]) twisted.trial.unittest.FailTest: not equal: a = [] b = ['Foo\n'] =============================================================================== [FAIL]: twisted.internet.test.test_process.ProcessTestsBuilder_PollReactor.test_systemCallUninterruptedByChildExit Traceback (most recent call last): File "/mnt/aquaria/nobackup/home/tim/tmp/Twisted-git/twisted/internet/test/test_process.py", line 219, in test_systemCallUninterruptedByChildExit self.assertEqual(result, ["Foo\n"]) twisted.trial.unittest.FailTest: not equal: a = [] b = ['Foo\n'] =============================================================================== [FAIL]: twisted.internet.test.test_process.ProcessTestsBuilder_SelectReactor.test_systemCallUninterruptedByChildExit Traceback (most recent call last): File "/mnt/aquaria/nobackup/home/tim/tmp/Twisted-git/twisted/internet/test/test_process.py", line 219, in test_systemCallUninterruptedByChildExit self.assertEqual(result, ["Foo\n"]) twisted.trial.unittest.FailTest: not equal: a = [] b = ['Foo\n'] =============================================================================== [ERROR]: twisted.internet.test.test_process.PTYProcessTestsBuilder_PollReactor.test_systemCallUninterruptedByChildExit Traceback (most recent call last): File "/mnt/aquaria/nobackup/home/tim/tmp/Twisted-git/twisted/internet/base.py", line 409, in _continueFiring callable(*args, **kwargs) File "/mnt/aquaria/nobackup/home/tim/tmp/Twisted-git/twisted/internet/test/test_process.py", line 213, in f result.append(f2.read()) exceptions.IOError: [Errno 4] Interrupted system call =============================================================================== [ERROR]: twisted.internet.test.test_process.PTYProcessTestsBuilder_SelectReactor.test_systemCallUninterru