On 2015-05-19, Skip Montanaro <skip.montan...@gmail.com> wrote:
> Yeah, I'm still on 2.7, and am aware of PEP 446. Note that many of the file
> descriptors will not have been created by my Python code. They will have
> been created by underlying C/C++ libraries, so I can't guarantee which
> flags were set on file open.
There is no portable way to do this, the problem is Unix not Python.
The below code is a reasonable stab at it, but there is no 100%
guaranteed method. The code is untested but you get the idea.
import errno
import os
def closeall(min=0, max=4096, keep=frozenset()):
"""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/$$/pid
try:
for fd in os.listdir("/proc/%d/fd" % (os.getpid())):
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
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