On 2015-06-02, Marko Rauhamaa <ma...@pacujo.net> wrote:
> Skip Montanaro <skip.montan...@gmail.com>:
>
>> On Tue, Jun 2, 2015 at 10:28 AM, Marko Rauhamaa <ma...@pacujo.net> wrote:
>>>
>>> The only problem is that you don't know how high you need to go in
>>> general.
>>
>> Sure, but I didn't know anyway, so no matter what upper bound I choose
>> (or what function I choose/implement), it's just going to be a guess.
>> os.closerange just codifies the straightforward procedure.
>
> Under linux, the cleanest way seems to be going through the files under
> /proc/self/fd:
>
> def close_fds(leave_open=[0, 1, 2]):
> fds = os.listdir(b'/proc/self/fd')
> for fdn in fds:
> fd = int(fdn)
> if fd not in leave_open:
> os.close(fd)
>
> No need for a upper bound.
Or use the more generic code that I already posted in this thread:
def closeall(min=0, max=4096, keep=()):
"""Close all open file descriptors except for the given exceptions.
Any file descriptors below or equal to `min`, or in the set `keep`
will not be closed. Any file descriptors above `max` *might* not be
closed.
"""
# First try /proc/self/pid
try:
for fd in os.listdir("/proc/self/fd"):
try:
fd = int(fd)
except ValueError:
continue
if fd >= min and fd not in keep:
os.close(int(fd))
return
except OSError as exc:
if exc[0] != errno.ENOENT:
raise
# If /proc was not available, fall back to closing a lot of descriptors.
for fd in range(min, max):
if fd not in keep:
try:
os.close(fd)
except OSError as exc:
if exc[0] != errno.EBADF:
raise
This function could use os.closerange(), but if the documentation is
correct and it ignores *all* errors and not just EBADF, then it
sounds like os.closerange() should not in fact ever be used for any
purpose.
--
https://mail.python.org/mailman/listinfo/python-list
