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//===----------------------------------------------------------------------===//
//
// 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
//
//===----------------------------------------------------------------------===//
// The behavior of std::random_device changed on Apple platforms with
// https://llvm.org/D116045 (d202c76441e1).
// XFAIL: target={{.+}}-apple-{{.+}} && using-built-library-before-llvm-14
// UNSUPPORTED: no-random-device
// <random>
// class random_device;
// explicit random_device(const string& token = implementation-defined); // before C++20
// random_device() : random_device(implementation-defined) {} // C++20
// explicit random_device(const string& token); // C++20
// For the following ctors, the standard states: "The semantics and default
// value of the token parameter are implementation-defined". Implementations
// therefore aren't required to accept any string, but the default shouldn't
// throw.
#include <random>
#include <string>
#include <system_error>
#include <cassert>
#if !defined(_WIN32)
#include <unistd.h>
#endif
#include "test_macros.h"
#if TEST_STD_VER >= 11
#include "test_convertible.h"
#endif
void check_random_device_valid(const std::string &token) {
std::random_device r(token);
}
void check_random_device_invalid(const std::string &token) {
#ifndef TEST_HAS_NO_EXCEPTIONS
try {
std::random_device r(token);
LIBCPP_ASSERT(false);
} catch (const std::system_error&) {
}
#else
((void)token);
#endif
}
int main(int, char**) {
{
std::random_device r;
(void)r;
}
// Check the validity of various tokens
{
#if defined(_LIBCPP_USING_ARC4_RANDOM)
check_random_device_valid("/dev/urandom");
check_random_device_valid("/dev/random");
check_random_device_valid("/dev/null");
check_random_device_valid("/dev/nonexistent");
check_random_device_valid("wrong file");
#elif defined(_LIBCPP_USING_DEV_RANDOM)
check_random_device_valid("/dev/urandom");
check_random_device_valid("/dev/random");
check_random_device_valid("/dev/null");
check_random_device_invalid("/dev/nonexistent");
check_random_device_invalid("wrong file");
#else
check_random_device_valid("/dev/urandom");
check_random_device_invalid("/dev/random");
check_random_device_invalid("/dev/null");
check_random_device_invalid("/dev/nonexistent");
check_random_device_invalid("wrong file");
#endif
}
#if !defined(_WIN32)
// Test that random_device(const string&) properly handles getting
// a file descriptor with the value '0'. Do this by closing the standard
// streams so that the descriptor '0' is available.
{
int ec;
ec = close(STDIN_FILENO);
assert(!ec);
ec = close(STDOUT_FILENO);
assert(!ec);
ec = close(STDERR_FILENO);
assert(!ec);
std::random_device r;
}
#endif // !defined(_WIN32)
#if TEST_STD_VER >= 11
static_assert(test_convertible<std::random_device>(), "");
#endif
return 0;
}
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