random-util: handle if getrandom() returns 0
This should normally not happen, but given that the man page suggests something about this in the context of interruption, let's handle this and propagate an I/O error.
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@ -93,6 +93,9 @@ int genuine_random_bytes(void *p, size_t n, bool high_quality_required) {
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}
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already_done = r;
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} else if (r == 0) {
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have_syscall = true;
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return -EIO;
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} else if (errno == ENOSYS)
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/* We lack the syscall, continue with reading from /dev/urandom. */
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have_syscall = false;
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