[parted-devel] generate_random_id() fix

[H. Peter Anvin]

The existing generate_random_id() in libparted only produces numbers in
the range 0..999999, less than 20 bits.  This patch tries to get a
random number from /dev/urandom if available, and otherwise produces a
32-bit value from gettimeofday().

Signed-off-by: H. Peter Anvin <hpa at zytor.com>

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