23 lines
663 B
Python
23 lines
663 B
Python
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import os
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def dupfile(f, mode=None, buffering=0, raising=False):
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""" return a new open file object that's a duplicate of f
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mode is duplicated if not given, 'buffering' controls
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buffer size (defaulting to no buffering) and 'raising'
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defines whether an exception is raised when an incompatible
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file object is passed in (if raising is False, the file
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object itself will be returned)
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"""
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try:
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fd = f.fileno()
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except AttributeError:
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if raising:
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raise
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return f
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newfd = os.dup(fd)
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mode = mode and mode or f.mode
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return os.fdopen(newfd, mode, buffering)
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