Github user jpeach commented on the pull request:
https://github.com/apache/trafficserver/pull/571#issuecomment-219535666
``0`` is a GNU extension behaviour, from the [man
page](http://man7.org/linux/man-pages/man3/getopt.3.html):
```
... and wants to make use of GNU extensions such as '+' and '-' at the start
of optstring, or changes the value of POSIXLY_CORRECT between scans,
must reinitialize getopt() by resetting optind to 0, rather than the
traditional
value of 1.
```
This is probably where the confusion originates, since for glibc either
``0`` or ``1`` should work, depending on which part of the man page the author
read. On non-gllibc, ``1`` is the only value that would work. AFAIK we don't
have any plugins that use GNU extensions, so I recommend we reset ``optind`` to
``1`` in the plugin loader so that plugins always get the right behaviour by
default.
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