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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
//
//===----------------------------------------------------------------------===//
// See bugs.llvm.org/PR20183
//
// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11}}
// UNSUPPORTED: libcpp-has-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 <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
bool is_valid_random_device(const std::string &token) {
#if defined(_LIBCPP_USING_DEV_RANDOM)
// Not an exhaustive list: they're the only tokens that are tested below.
return token == "/dev/urandom" || token == "/dev/random";
#else
return token == "/dev/urandom";
#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;
}
{
std::string token = "wrong file";
check_random_device_invalid(token);
}
{
std::string token = "/dev/urandom";
if (is_valid_random_device(token))
check_random_device_valid(token);
else
check_random_device_invalid(token);
}
{
std::string token = "/dev/random";
if (is_valid_random_device(token))
check_random_device_valid(token);
else
check_random_device_invalid(token);
}
#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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