[RTEMS Project] #3239: Add getentropy() implementation provided by each BSP

[RTEMS trac]

#3239: Add getentropy() implementation provided by each BSP
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 Reporter:  Sebastian Huber  |      Owner:  Sebastian Huber
     Type:  enhancement      |     Status:  assigned
 Priority:  normal           |  Milestone:  5.1
Component:  dev              |    Version:  5
 Severity:  normal           |   Keywords:
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 The getentropy() system call was introduced by OpenBSD and is now also
 available on glibc 2.25 and later. It is used for example by
 arc4random_buf(). Which in turn is used by various cryptographic
 functions.

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Ticket URL: <http://devel.rtems.org/ticket/3239>
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