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"""A utility module which has FD-related functions.
This module mostly exists for L{clean_fds}, so it can be imported without
accidentally getting a reactor or something else that might create a critical
file descriptor.
"""
import os
import resource
def clean_fds():
"""Close all non-stdio file descriptors.
This should be called at the beginning of a program to avoid inheriting any
unwanted file descriptors from the invoking process. Unfortunately, this
is really common in unix!
"""
rlimit_nofile = resource.getrlimit(resource.RLIMIT_NOFILE)[1]
total_descriptors = min(4096, rlimit_nofile)
for fd in range(3, total_descriptors):
try:
os.close(fd)
except OSError:
pass