New submission from dellair jie:

Folks,

I am running Python 3.4 on Cygwin 1.7.17 on Windows 2008.
The constant error I get is:

Traceback (most recent call last):
  File "M:/sb3_ljie/bce/cmTools/lib/CC.py", line 321, in standAlone
    results = Process.execute (cmd = cmd, opts = opts)
  File "M:/sb3_ljie/bce/cmTools/lib/Process.py", line 327, in execute
    timeout = timeout)
  File "/usr/local/lib/python3.4/subprocess.py", line 535, in call
    with Popen(*popenargs, **kwargs) as p:
  File "/usr/local/lib/python3.4/subprocess.py", line 848, in __init__
    restore_signals, start_new_session)
  File "/usr/local/lib/python3.4/subprocess.py", line 1379, in _execute_child
    restore_signals, start_new_session, preexec_fn)
BlockingIOError: [Errno 11] Resource temporarily unavailable

Python script is invoked via socket (server runs Cygwin inetd).

While the script (snippet) Process.py is as below with relatively large data 
return:
import subprocess, os, tempfile, re
def execute (cmd = None,
             opts = None,
             log = None,
             verify = False,
             cmdlog = False,
             audit = False,
             logappend = False,
             ignorestatus = False,
             umask = None,
             host = None,
             interrupt = None,
             timeout = None,
             forceaudit = False):
    global __signal
    global __signalList
    returnData = {"status": 0, "rawstatus": 0, "interrupt": 0,
                  "stdout": None, "stderr": None}
    os.environ["ENV"] = ""

    stdOutHandle, stdOut = tempfile.mkstemp (text = True)
    stdErrHandle, stdErr = tempfile.mkstemp (text = True)

    if re.match ("\s", cmd): cmd = "'" + cmd + "'"
    cmd = [cmd]
    opts = opts.split()
    cmd.extend (opts)

    if not verify:
        if umask: originalUmask = os.umask (umask)

        if interrupt:
            for idex, item in enumerate (__signalList):
                if item: signal.signal (idex, interrupt)

        __signal = 0

        returnData["rawstatus"] = subprocess.call (cmd, stdout = stdOutHandle,
                                                   stderr = stdErrHandle,
                                                   timeout = timeout)
        returns = returnData["rawstatus"]
    os.close (stdOutHandle)
    os.close (stdErrHandle)

Br,
Dellair

----------
messages: 217585
nosy: dellair.jie
priority: normal
severity: normal
status: open
title: Python on Cygwin: subprocess.call BlockingIOError: [Errno 11] Resource 
temporarily unavailable
versions: Python 3.4

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue21392>
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