Duane,
It looks like you are running Python from Python via popen(). It may be that
when the child instance of Python quits, the sockets library is cleaning up
after itself and closing/confusing any open sockets.
The destructor for EfiSocketLib attempts to shutdown the service and disconnect
from the network controller. It is possible that some state within the UEFI
network stack is getting changed by the child application which is then
unexpected and confusing to the parent application.
Every StdLib-based application will create a new, unique, environment at
startup. When the application finishes, it tries to clean up and de-allocate
the environment it created. Since there is no sharing between instances of
StdLib it is easy for a child application to change the state of a shared
resource (anything managed by the UEFI firmware, such as the network stack) in
a manner that is unexpected and can't be handled by the parent application.
Daryl McDaniel
"In the pun, two strings of thought are tangled into one acoustic knot."
-- Arthur Koestler
From: Duane Voth [mailto:dua...@gmail.com]
Sent: Monday, March 04, 2013 12:15 PM
To: edk2-devel@lists.sourceforge.net
Subject: [edk2] StdLibPkg - spawn*/exec*/system/popen - chdrive/chdir
chdir() that includes the volume (drive) is in the works. There is already a
system() that mostly works (spawn and the exec* functions all require a lot of
additional support that uEFI may never provide). Attached is a StdLib patch
(to StdLib/LibC/StdLib/Environs.c) I'm working with to get popen() like
functionality.
I'm using popen() with Python at the moment (which is an StdLib based app). The
problem I have right now is that if Python has open sockets, they are all
broken/closed after calling my os.popen('fs0:\python.efi test.py'). Perhaps
the second Python/StdLib is re-initializing the network stack? If someone who
knows EDK2 StdLib can comment on this aspect of socket support, I would
appreciate it.
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