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//===-- Unittests for getrandom -------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "src/__support/CPP/array.h"
#include "src/math/fabs.h"
#include "src/sys/random/getrandom.h"
#include "test/UnitTest/ErrnoCheckingTest.h"
#include "test/UnitTest/ErrnoSetterMatcher.h"
#include "test/UnitTest/Test.h"
using namespace LIBC_NAMESPACE::testing::ErrnoSetterMatcher;
using LlvmLibcGetRandomTest = LIBC_NAMESPACE::testing::ErrnoCheckingTest;
TEST_F(LlvmLibcGetRandomTest, InvalidFlag) {
LIBC_NAMESPACE::cpp::array<char, 10> buffer;
ASSERT_THAT(LIBC_NAMESPACE::getrandom(buffer.data(), buffer.size(), -1),
Fails<ssize_t>(EINVAL));
}
TEST_F(LlvmLibcGetRandomTest, InvalidBuffer) {
ASSERT_THAT(LIBC_NAMESPACE::getrandom(nullptr, 65536, 0),
Fails<ssize_t>(EFAULT));
}
TEST_F(LlvmLibcGetRandomTest, ReturnsSize) {
LIBC_NAMESPACE::cpp::array<char, 10> buffer;
for (size_t i = 0; i < buffer.size(); ++i) {
// Without GRND_RANDOM set this should never fail.
ASSERT_EQ(LIBC_NAMESPACE::getrandom(buffer.data(), i, 0),
static_cast<ssize_t>(i));
}
}
TEST_F(LlvmLibcGetRandomTest, CheckValue) {
// Probability of picking one particular value amongst 256 possibilities a
// hundred times in a row is (1/256)^100 = 1.49969681e-241.
LIBC_NAMESPACE::cpp::array<char, 100> buffer;
for (char &c : buffer)
c = 0;
LIBC_NAMESPACE::getrandom(buffer.data(), buffer.size(), 0);
bool all_zeros = true;
for (char c : buffer)
if (c != 0)
all_zeros = false;
ASSERT_FALSE(all_zeros);
}
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