Paul Price added the comment:
The OSX manpage for setrlimit includes:
COMPATIBILITY
setrlimit() now returns with errno set to EINVAL in places that histori-
cally succeeded. It no longer accepts "rlim_cur = RLIM_INFINITY" for
RLIM_NOFILE. Use "rlim_cur = min(OPEN_MAX, rlim_max)".
It's strange that this is not mentioned in the corresponding manpage on Ubuntu
12.04.
It seems the reason we can't use -1 for RLIMIT_NOFILE is because this requests
'unlimited' (RLIM_INFINITY), while there is always a limit on the number of
open files (e.g., OPEN_MAX).
Looking at the code (Modules/resource.c), python is doing the sensible thing.
It seems that resource.setrlimit would have to be special-cased for
RLIMIT_NOFILE to work as documented when specifying a "-1", but then python
would be diverging from the behaviour of the underlying system call.
I therefore propose that the documentation simply be adjusted to note the
observed behaviour (i.e., specifying -1 means 'unlimited', and does not work in
general for RLIMIT_NOFILE). I would be happy to provide a patch if this is
desired.
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<http://bugs.python.org/issue17409>
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