Hi,
When starting a lot of new screen windows in parallel, some windows
don't actually open, and I get some errors instead:
Invalid message (magic 0x00000000).
Invalid message (magic 0x736e6f69).
(the latter seems to be ASCII "snoi").
You can reproduce it e.g. this Python script:
8<-----------------------------------------------------------
import os
import shutil
import sys
import subprocess
import time
if not os.getenv('STY'):
print >>sys.stderr, 'Need to run inside an existing screen session'
sys.exit(1)
# create pids/
if os.path.exists('pids'):
shutil.rmtree('pids')
os.mkdir('pids')
expected_n = 100
for i in range(expected_n):
subprocess.check_call(['screen', 'bash', '-c', 'echo 1 > pids/$$'])
# give the processes above some time to start
time.sleep(5)
actual_n = len(os.listdir('pids'))
print "expected %u, got %u" % (expected_n, actual_n)
8<-----------------------------------------------------------
This will mostly print "expected 100, got 100", but sometimes it
prints "expected 100, got 99".
I've only found this earlier report (from 2005) of something similar:
https://lists.gnu.org/archive/html/screen-users/2005-01/msg00057.html
They are also starting a lot of windows in parallel, i.e.: "I'm
writing a system that puts a lot of windows (about 12) into a screen
session".
Are there any recent fixes or workarounds for this problem?
Thanks,
Vegard
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