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openpty: limits for name
A Linux man page I found for openpty says:
Nobody knows how much space should be reserved for name. So,
calling openpty() or forkpty() with non-NULL name may not be secure.
Our man page is silent on that.
The code in libutil/pty.c just does:
I wonder if we (can and) want to promise a limit in the man page, or
just add a comment like the one in the Linux man page.
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