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Clarify INTERNAL_ERROR_ARC4RANDOM_GETENTROPY_FAIL

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Update #3239.
This commit is contained in:
Sebastian Huber 2017-11-20 08:08:30 +01:00
parent e2a1a3ab2a
commit 70f23e475b
2 changed files with 6 additions and 2 deletions
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5
bsp-howto/getentropy.rst
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@ -21,7 +21,10 @@ turn are used by various cryptographic functions.
suitable for such applications.
The :c:func:`getentropy` implementation must fill the specified memory region
of the given size with random numbers and return 0 on success.
of the given size with random numbers and return 0 on success. A non-zero
return may cause the :c:macro:`INTERNAL_ERROR_ARC4RANDOM_GETENTROPY_FAIL`
internal error by one of the
`ARC4RANDOM(3) <https://man.openbsd.org/arc4random.3>`_ functions.
In general, for embedded systems it is not easy to get some real entropy. Normally,
that can only be reached with some extra hardware support. Some microcontrollers

3
c-user/fatal_error.rst
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@ -390,7 +390,8 @@ INTERNAL_ERROR_ILLEGAL_USE_OF_FLOATING_POINT_UNIT (38)
INTERNAL_ERROR_ARC4RANDOM_GETENTROPY_FAIL (39)
A :c:func:`getentropy` system call failed in one of the `ARC4RANDOM(3)
<https://man.openbsd.org/arc4random.3>`_ functions.
<https://man.openbsd.org/arc4random.3>`_ functions. This fatal error can
only be fixed with a different implementation of :c:func:`getentropy`.
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