compling and running python - subprocesses not working

[schlange]

when i run python 2.5 on qnx 6.4.0 and try to invoke a network service it crashes with the following error trace:

Traceback (most recent call last):
File "/usr/qnx640/host/qnx6/x86/usr/lib/python2.5/threading.py", line 486, in __bootstrap_inner
self.run()
File "/root/ros_svn/ros/bin/rosmake", line 89, in run
(pkg, build_count, total_pkgs) = self.build_queue.get_valid_package()
File "/root/ros_svn/ros/bin/rosmake", line 148, in get_valid_package
for d in self.dependency_tracker.get_deps(p):
File "/root/ros_svn/ros/bin/rosmake", line 73, in get_deps
self.deps[package] = roslib.scriptutil.rospack_depends(package)
File "/root/ros_svn/ros/core/roslib/src/roslib/scriptutil.py", line 99, in rospack_depends
return rospackexec(['deps', pkg]).split()
File "/root/ros_svn/ros/core/roslib/src/roslib/scriptutil.py", line 80, in rospackexec
val = (subprocess.Popen(['rospack'] + args, stdout=subprocess.PIPE).communicate()[0] or '').strip()
File "/usr/qnx640/host/qnx6/x86/usr/lib/python2.5/subprocess.py", line 594, in __init__
errread, errwrite)
File "/usr/qnx640/host/qnx6/x86/usr/lib/python2.5/subprocess.py", line 1011, in _execute_child
self.pid = os.fork()
OSError: [Errno 89] Function not implemented


i then tried to compile python 2.6.4 and realized during configuration that thread.h was not found (of which i think that it's responsible for fork(), right?).

Does anybody has helpful comments on running python, especially functionality that is part of subprocess.py?

Or is it just not implemented on qnx?

[seanb]

Can you post a test script. This is probably trying to fork()
after pthread_create() but there's probably a way arounde it.

-seanb

[130s]

Since OP hasn't provided the reproduction scenario, I'll take over the thread (is it ok?).

Error output:

# pip install -U catkin_pkg
Downloading/unpacking catkin-pkg
Running setup.py egg_info for package catkin-pkg

Downloading/unpacking argparse (from catkin-pkg)
Downloading argparse-1.2.1.tar.gz (69kB): 69kB downloaded
Running setup.py egg_info for package argparse
Error [Errno 89] Function not implemented while executing command python setup.py egg_info
Exception:
Traceback (most recent call last):
File "/usr/pkg/lib/python2.7/site-packages/pip-1.3-py2.7.egg/pip/basecommand.py", line 139, in main
status = self.run(options, args)
File "/usr/pkg/lib/python2.7/site-packages/pip-1.3-py2.7.egg/pip/commands/install.py", line 266, in run
requirement_set.prepare_files(finder, force_root_egg_info=self.bundle, bundle=self.bundle)
File "/usr/pkg/lib/python2.7/site-packages/pip-1.3-py2.7.egg/pip/req.py", line 1057, in prepare_files
req_to_install.run_egg_info()
File "/usr/pkg/lib/python2.7/site-packages/pip-1.3-py2.7.egg/pip/req.py", line 236, in run_egg_info
command_desc='python setup.py egg_info')
File "/usr/pkg/lib/python2.7/site-packages/pip-1.3-py2.7.egg/pip/util.py", line 627, in call_subprocess
cwd=cwd, env=env)
File "/usr/pkg/lib/python2.7/subprocess.py", line 711, in __init__
errread, errwrite)
File "/usr/pkg/lib/python2.7/subprocess.py", line 1205, in _execute_child
self.pid = os.fork()
OSError: [Errno 89] Function not implemented

Storing complete log in /root/.pip/pip.log

pip version is 1.3, of which codes are available in this branch on github: https://github.com/pypa/pip/tree/1.3/pip

I'm using QNX 6.5.0 SDP SP1

On python's console, os.fork(), which I assume the source of the cause, behaves differently.

# python
Python 2.7.4 (default, Jun 21 2013, 22:33:48)
[GCC 4.4.2] on qnx6
Type "help", "copyright", "credits" or "license" for more information.
>>> import os
>>> os.fork()
18804790
>>> 0
sem_wait: Invalid argument

How can I avoid this error? Thank you!