[Bug libc/15813] Multiple issues in __gen_tempname

[jakub at redhat dot com]

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

--- Comment #9 from Jakub Jelinek <jakub at redhat dot com> ---
The non-_LIBC fallback is actually worse (gettimeofday with usec precision).
Anyway, I think the usec timer with pid is just fine for the first attempt, so
reading from /dev/urandom or using similar syscall is I think a waste of time
for the common case, it is just in the unlikely case that the file exists that
perhaps something more expensive is needed.

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