a90c6dd460
git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@224658 91177308-0d34-0410-b5e6-96231b3b80d8
86 lines
2.2 KiB
C++
86 lines
2.2 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is dual licensed under the MIT and the University of Illinois Open
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// Source Licenses. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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// <random>
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// class random_device;
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// explicit random_device(const string& token = implementation-defined);
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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 <cassert>
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#include <unistd.h>
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bool is_valid_random_device(const std::string &token) {
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#if defined(_WIN32)
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return true;
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#elif defined(_LIBCPP_USING_NACL_RANDOM)
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return token == "/dev/urandom";
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#else // !defined(_WIN32) && !defined(_LIBCPP_USING_NACL_RANDOM)
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// Not an exhaustive list: they're the only tokens that are tested below.
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return token == "/dev/urandom" || token == "/dev/random";
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#endif // defined(_WIN32) || defined(_LIBCPP_USING_NACL_RANDOM)
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}
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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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try {
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std::random_device r(token);
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assert(false);
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} catch (const std::system_error &e) {
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}
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}
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int main() {
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{ std::random_device r; }
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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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{
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std::string token = "wrong file";
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if (is_valid_random_device(token))
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check_random_device_valid(token);
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else
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check_random_device_invalid(token);
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}
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{
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std::string token = "/dev/urandom";
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if (is_valid_random_device(token))
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check_random_device_valid(token);
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else
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check_random_device_invalid(token);
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}
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{
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std::string token = "/dev/random";
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if (is_valid_random_device(token))
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check_random_device_valid(token);
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else
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check_random_device_invalid(token);
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}
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}
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