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 // <random> 11 12 // class random_device; 13 14 // explicit random_device(const string& token = implementation-defined); 15 16 // For the following ctors, the standard states: "The semantics and default 17 // value of the token parameter are implementation-defined". Implementations 18 // therefore aren't required to accept any string, but the default shouldn't 19 // throw. 20 21 #include <random> 22 #include <cassert> 23 #include <unistd.h> 24 25 bool is_valid_random_device(const std::string &token) { 26 #if defined(_LIBCPP_USING_DEV_RANDOM) 27 // Not an exhaustive list: they're the only tokens that are tested below. 28 return token == "/dev/urandom" || token == "/dev/random"; 29 #else 30 return token == "/dev/urandom"; 31 #endif 32 } 33 34 void check_random_device_valid(const std::string &token) { 35 std::random_device r(token); 36 } 37 38 void check_random_device_invalid(const std::string &token) { 39 try { 40 std::random_device r(token); 41 assert(false); 42 } catch (const std::system_error &e) { 43 } 44 } 45 46 int main() { 47 { std::random_device r; } 48 49 { 50 int ec; 51 ec = close(STDIN_FILENO); 52 assert(!ec); 53 ec = close(STDOUT_FILENO); 54 assert(!ec); 55 ec = close(STDERR_FILENO); 56 assert(!ec); 57 std::random_device r; 58 } 59 60 { 61 std::string token = "wrong file"; 62 if (is_valid_random_device(token)) 63 check_random_device_valid(token); 64 else 65 check_random_device_invalid(token); 66 } 67 68 { 69 std::string token = "/dev/urandom"; 70 if (is_valid_random_device(token)) 71 check_random_device_valid(token); 72 else 73 check_random_device_invalid(token); 74 } 75 76 { 77 std::string token = "/dev/random"; 78 if (is_valid_random_device(token)) 79 check_random_device_valid(token); 80 else 81 check_random_device_invalid(token); 82 } 83 } 84
