[Bug libc/17252] getrandom and getentropy syscall

[fweimer at redhat dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=17252

--- Comment #2 from Florian Weimer <fweimer at redhat dot com> ---
(In reply to Cristian Rodríguez from comment #0)
> Ideally, if the system call is not found in the running kernel, fallback to
> emulation by reading /dev/urandom in the default case or /dev/random if 
> GRND_RANDOM is used.

If GRND_NONBLOCK is not set and the buffer is proper, the system call cannot
fail.  It is impossible to achieve that with emulation.

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