Re: error: Invalid message (magic 0x00000000).

As a workaround, try putting a sleep 1 between launching screens?

On Tue, Oct 18, 2016 at 4:02 AM, Vegard Nossum <[email protected]>
wrote:

> 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
>
> _______________________________________________
> screen-users mailing list
> screen-users-mXXj517/[email protected]
> https://lists.gnu.org/mailman/listinfo/screen-users
>



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