3 // Copyright (C) 2012-2015 Free Software Foundation, Inc.
5 // This file is part of the GNU ISO C++ Library. This library is free
6 // software; you can redistribute it and/or modify it under the
7 // terms of the GNU General Public License as published by the
8 // Free Software Foundation; either version 3, or (at your option)
11 // This library is distributed in the hope that it will be useful,
12 // but WITHOUT ANY WARRANTY; without even the implied warranty of
13 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 // GNU General Public License for more details.
16 // Under Section 7 of GPL version 3, you are granted additional
17 // permissions described in the GCC Runtime Library Exception, version
18 // 3.1, as published by the Free Software Foundation.
20 // You should have received a copy of the GNU General Public License and
21 // a copy of the GCC Runtime Library Exception along with this program;
22 // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
23 // <http://www.gnu.org/licenses/>.
25 #define _GLIBCXX_USE_CXX11_ABI 1
28 #ifdef _GLIBCXX_USE_C99_STDINT_TR1
30 #if defined __i386__ || defined __x86_64__
36 #ifdef _GLIBCXX_HAVE_UNISTD_H
40 namespace std _GLIBCXX_VISIBILITY(default)
45 _M_strtoul(const std::string& __str)
47 unsigned long __ret = 5489UL;
48 if (__str != "mt19937")
50 const char* __nptr = __str.c_str();
52 __ret = std::strtoul(__nptr, &__endptr, 0);
53 if (*__nptr == '\0' || *__endptr != '\0')
54 std::__throw_runtime_error(__N("random_device::_M_strtoul"
55 "(const std::string&)"));
60 #if (defined __i386__ || defined __x86_64__) && defined _GLIBCXX_X86_RDRAND
62 __attribute__ ((target("rdrnd")))
65 unsigned int retries = 100;
68 while (__builtin_ia32_rdrand32_step(&val) == 0)
70 std::__throw_runtime_error(__N("random_device::__x86_rdrand(void)"));
78 random_device::_M_init(const std::string& token)
80 const char *fname = token.c_str();
82 if (token == "default")
84 #if (defined __i386__ || defined __x86_64__) && defined _GLIBCXX_X86_RDRAND
85 unsigned int eax, ebx, ecx, edx;
86 // Check availability of cpuid and, for now at least, also the
87 // CPU signature for Intel's
88 if (__get_cpuid_max(0, &ebx) > 0 && ebx == signature_INTEL_ebx)
90 __cpuid(1, eax, ebx, ecx, edx);
99 fname = "/dev/urandom";
101 else if (token != "/dev/urandom" && token != "/dev/random")
103 std::__throw_runtime_error(__N("random_device::"
104 "random_device(const std::string&)"));
106 _M_file = static_cast<void*>(std::fopen(fname, "rb"));
112 random_device::_M_init_pretr1(const std::string& token)
114 _M_mt.seed(_M_strtoul(token));
118 random_device::_M_fini()
121 std::fclose(static_cast<FILE*>(_M_file));
124 random_device::result_type
125 random_device::_M_getval()
127 #if (defined __i386__ || defined __x86_64__) && defined _GLIBCXX_X86_RDRAND
129 return __x86_rdrand();
133 #ifdef _GLIBCXX_HAVE_UNISTD_H
134 read(fileno(static_cast<FILE*>(_M_file)),
135 static_cast<void*>(&__ret), sizeof(result_type));
137 std::fread(static_cast<void*>(&__ret), sizeof(result_type),
138 1, static_cast<FILE*>(_M_file));
143 random_device::result_type
144 random_device::_M_getval_pretr1()
149 template class mersenne_twister_engine<
155 0xefc60000UL, 18, 1812433253UL>;