Tjeerd Pinkert t.j.pink...@alumnus.utwente.nl added the comment:
Indeed I use Linux, sorry for the inconvenience of not mentioning.
Thanks Ned, I think this is indeed the case. Using os.setgroups with a list of
group ids (one for the file access, one for the serial port) before switching
user
Ned Deily n...@acm.org added the comment:
It could be a feature of os that the groups of the user are set on a os.setuid
call? Or would this break compatibility with the standard unix library
behaviour?
The POSIX system interface specification specifically prohibits that: The
setuid()
New submission from Tjeerd Pinkert t.j.pink...@alumnus.utwente.nl:
If I use os.setgid and os.setuid to switch to an other user in some daemon
code, I cannot open the serial port anymore. If I run the same code directly
from the user I can open the serial port. Since the serial module is using
Changes by Tjeerd Pinkert t.j.pink...@alumnus.utwente.nl:
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type: - behavior
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Python tracker rep...@bugs.python.org
http://bugs.python.org/issue10032
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Ned Deily n...@acm.org added the comment:
While you did not specify what platform you are running this on, the issue here
is almost certainly a misunderstanding of how permissions work. On UNIX-y
systems, access to device files is normally governed by permissions like any
other file or
R. David Murray rdmur...@bitdance.com added the comment:
If you do want to pursue this further note that [your] own crappy code is a
better reproducer to post than something that depends on a third party module.
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nosy: +r.david.murray
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Python
