trouble with sys.exec and sockets/ssh
Richard Cook
rcook at llnl.gov
Fri Feb 21 13:54:03 EST 2003
Hi,
I have a problem as follows. I call an executable with os.execv(cmd,
args) and it launches fine. However, it then misbehaves. The normal
behavior of the program is to fork off children, each of which execs
another process (ssh), which creates a process on a remote machine,
which connects back to the main process using a socket connection
over TCP/IP or UDP. This works fine every time from the shell
command line. But it fails from my python script. The behavior when
I fork it off using os.execv in python is that the socket connections
back "home" from the children fail. Not all of them fail, just many
of them. (If any fail, it's a disaster for me.) Clearly the
environment that the process I execv from python sees is somehow
different than that seen by the same process if I run it from the
shell. Can anyone guess as to what I'm doing wrong or not
understanding? Thank you.
--
Richard Cook
Lawrence Livermore National Laboratory
Bldg-451 Rm-2043, Mail Stop L-561
7000 East Avenue, Livermore, CA, 94550, USA
phone (925) 423-9605 (work) fax (925) 423-8704
---
Information Management & Graphics Grp., Services & Development Div.,
Integrated Computing & Communications Dept.
(opinions expressed herein are mine and not those of LLNL)
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