[IPython-dev] ERROR can not use fork(), exec(), dup2() to communicate with child process
Andy at SantaCruzIntegration.com
Thu Oct 2 19:17:34 EDT 2014
I want to write a notebook that receives data from another process. Bellow
is my python code. It forks a child process and reads the data from the
child using a pipe. This code works if I run it in python. When I try to
execute from iPython notebook I get the following error. Any idea what the
problems is ?
If pipes do not work, can I use a socket? The other process would send me
data by writing, my notebook needs behave like a server.
Any comments or suggestions would be greatly appreciated.
P.s. I am running headless on a remote machine and use an ssh tunnel to run
the notebook from my local browser. My other notebooks works fine
[ec2-user at ip-172-31-14-107 ~]$ IPYTHON_OPTS="notebook --pylab inline
--no-browser --port=7000" /root/spark/bin/pyspark
/root/spark/conf/spark-env.sh: line 21: ulimit: open files: cannot modify
limit: Operation not permitted
[NotebookApp] Using existing profile dir:
[NotebookApp] Serving notebooks from /home/ec2-user
[NotebookApp] The IPython Notebook is running at: http://127.0.0.1:7000/
[NotebookApp] Use Control-C to stop this server and shut down all kernels.
[NotebookApp] Using MathJax from CDN:
[NotebookApp] Kernel started: 71f07d5c-2db1-465f-9d86-da29f8711a0b
[NotebookApp] Connecting to: tcp://127.0.0.1:54119
[NotebookApp] Connecting to: tcp://127.0.0.1:50649
[NotebookApp] Connecting to: tcp://127.0.0.1:35516
[IPKernelApp] To connect another client to this kernel, use:
[IPKernelApp] --existing kernel-71f07d5c-2db1-465f-9d86-da29f8711a0b.json
Assertion failed: ok (bundled/zeromq/src/mailbox.cpp:79)
[NotebookApp] Kernel 71f07d5c-2db1-465f-9d86-da29f8711a0b failed to respond
pipein, pipeout = os.pipe()
if os.fork() == 0:
counter = 1
pipein = os.fdopen(pipein)
json = pipein.readline()[:-1]
print 'parent: %s' % (json)
$ cat test.sh
echo $script_name $args
echo "XYZ: "$XYZ
echo "PATH: "$PATH
echo "current directory: $current"
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