110 lines
3.2 KiB
C++
110 lines
3.2 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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// See https://llvm.org/PR20183
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// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11}}
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// The behavior of std::random_device changed on Apple platforms with
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// https://llvm.org/D116045.
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// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
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// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{11.0|12.0}}
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// UNSUPPORTED: no-random-device
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// <random>
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// class random_device;
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// explicit random_device(const string& token = implementation-defined); // before C++20
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// random_device() : random_device(implementation-defined) {} // C++20
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// explicit random_device(const string& token); // C++20
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// For the following ctors, the standard states: "The semantics and default
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// value of the token parameter are implementation-defined". Implementations
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// therefore aren't required to accept any string, but the default shouldn't
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// throw.
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#include <random>
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#include <system_error>
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#include <cassert>
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#if !defined(_WIN32)
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#include <unistd.h>
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#endif
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#include "test_macros.h"
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#if TEST_STD_VER >= 11
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#include "test_convertible.h"
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#endif
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void check_random_device_valid(const std::string &token) {
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std::random_device r(token);
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}
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void check_random_device_invalid(const std::string &token) {
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#ifndef TEST_HAS_NO_EXCEPTIONS
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try {
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std::random_device r(token);
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LIBCPP_ASSERT(false);
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} catch (const std::system_error&) {
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}
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#else
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((void)token);
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#endif
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}
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int main(int, char**) {
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{
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std::random_device r;
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}
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// Check the validity of various tokens
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{
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#if defined(_LIBCPP_USING_ARC4_RANDOM)
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check_random_device_valid("/dev/urandom");
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check_random_device_valid("/dev/random");
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check_random_device_valid("/dev/null");
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check_random_device_valid("/dev/nonexistent");
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check_random_device_valid("wrong file");
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#elif defined(_LIBCPP_USING_DEV_RANDOM)
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check_random_device_valid("/dev/urandom");
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check_random_device_valid("/dev/random");
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check_random_device_valid("/dev/null");
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check_random_device_invalid("/dev/nonexistent");
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check_random_device_invalid("wrong file");
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#else
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check_random_device_valid("/dev/urandom");
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check_random_device_invalid("/dev/random");
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check_random_device_invalid("/dev/null");
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check_random_device_invalid("/dev/nonexistent");
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check_random_device_invalid("wrong file");
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#endif
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}
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#if !defined(_WIN32)
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// Test that random_device(const string&) properly handles getting
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// a file descriptor with the value '0'. Do this by closing the standard
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// streams so that the descriptor '0' is available.
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{
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int ec;
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ec = close(STDIN_FILENO);
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assert(!ec);
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ec = close(STDOUT_FILENO);
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assert(!ec);
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ec = close(STDERR_FILENO);
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assert(!ec);
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std::random_device r;
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}
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#endif // !defined(_WIN32)
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#if TEST_STD_VER >= 11
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static_assert(test_convertible<std::random_device>(), "");
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#endif
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return 0;
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}
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