1 //===----------------------------------------------------------------------===// 2 // 3 // The LLVM Compiler Infrastructure 4 // 5 // This file is dual licensed under the MIT and the University of Illinois Open 6 // Source Licenses. See LICENSE.TXT for details. 7 // 8 //===----------------------------------------------------------------------===// 9 10 // See bugs.llvm.org/PR20183 11 // 12 // XFAIL: with_system_cxx_lib=macosx10.11 13 // XFAIL: with_system_cxx_lib=macosx10.10 14 // XFAIL: with_system_cxx_lib=macosx10.9 15 // XFAIL: with_system_cxx_lib=macosx10.8 16 // XFAIL: with_system_cxx_lib=macosx10.7 17 18 // <random> 19 20 // class random_device; 21 22 // explicit random_device(const string& token = implementation-defined); 23 24 // For the following ctors, the standard states: "The semantics and default 25 // value of the token parameter are implementation-defined". Implementations 26 // therefore aren't required to accept any string, but the default shouldn't 27 // throw. 28 29 #include <random> 30 #include <system_error> 31 #include <cassert> 32 33 #if !defined(_WIN32) 34 #include <unistd.h> 35 #endif 36 37 #include "test_macros.h" 38 39 40 bool is_valid_random_device(const std::string &token) { 41 #if defined(_LIBCPP_USING_DEV_RANDOM) 42 // Not an exhaustive list: they're the only tokens that are tested below. 43 return token == "/dev/urandom" || token == "/dev/random"; 44 #else 45 return token == "/dev/urandom"; 46 #endif 47 } 48 49 void check_random_device_valid(const std::string &token) { 50 std::random_device r(token); 51 } 52 53 void check_random_device_invalid(const std::string &token) { 54 #ifndef TEST_HAS_NO_EXCEPTIONS 55 try { 56 std::random_device r(token); 57 LIBCPP_ASSERT(false); 58 } catch (const std::system_error&) { 59 } 60 #else 61 ((void)token); 62 #endif 63 } 64 65 66 int main() { 67 { 68 std::random_device r; 69 } 70 { 71 std::string token = "wrong file"; 72 check_random_device_invalid(token); 73 } 74 { 75 std::string token = "/dev/urandom"; 76 if (is_valid_random_device(token)) 77 check_random_device_valid(token); 78 else 79 check_random_device_invalid(token); 80 } 81 { 82 std::string token = "/dev/random"; 83 if (is_valid_random_device(token)) 84 check_random_device_valid(token); 85 else 86 check_random_device_invalid(token); 87 } 88 #if !defined(_WIN32) 89 // Test that random_device(const string&) properly handles getting 90 // a file descriptor with the value '0'. Do this by closing the standard 91 // streams so that the descriptor '0' is available. 92 { 93 int ec; 94 ec = close(STDIN_FILENO); 95 assert(!ec); 96 ec = close(STDOUT_FILENO); 97 assert(!ec); 98 ec = close(STDERR_FILENO); 99 assert(!ec); 100 std::random_device r; 101 } 102 #endif // !defined(_WIN32) 103 } 104
