[Bug libc/15813] Multiple issues in __gen_tempname

[jakub at redhat dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=15813

--- Comment #7 from Jakub Jelinek <jakub at redhat dot com> ---
Perhaps upon the first EEXIST it could getrandom (with GRND_NONBLOCK) and from
that decide the addend to be used instead of 7777 and use RANDOM_BITS only
before the loop as the base?  The code should make sure the addend isn't
something like 0 or that would cause only very few possibilities in the TMP_MAX
attempts.  And/or the addend could change every few hundred attempts.

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