文件操作 - fd.py
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文件: /usr/lib/python3/dist-packages/landscape/lib/fd.py
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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
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