[issue33773] test.support.fd_count(): off-by-one error when listing /proc/self/fd/

[STINNER Victor]

STINNER Victor <vstinner at redhat.com> added the comment:

fd_count() has been added by bpo-18174. I just backported it to Python 2.7 to check for leak of file descriptors in tests. I found the bug when I fixed a bug on Python 2.7 on FreeBSD.

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<https://bugs.python.org/issue33773>
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