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__
37 #ifdef _GLIBCXX_HAVE_UNISTD_H
41 namespace std _GLIBCXX_VISIBILITY(default)
46 _M_strtoul(const std::string& __str)
48 unsigned long __ret = 5489UL;
49 if (__str != "mt19937")
51 const char* __nptr = __str.c_str();
53 __ret = std::strtoul(__nptr, &__endptr, 0);
54 if (*__nptr == '\0' || *__endptr != '\0')
55 std::__throw_runtime_error(__N("random_device::_M_strtoul"
56 "(const std::string&)"));
61 #if (defined __i386__ || defined __x86_64__) && defined _GLIBCXX_X86_RDRAND
63 __attribute__ ((target("rdrnd")))
66 unsigned int retries = 100;
69 while (__builtin_ia32_rdrand32_step(&val) == 0)
71 std::__throw_runtime_error(__N("random_device::__x86_rdrand(void)"));
79 random_device::_M_init(const std::string& token)
81 const char *fname = token.c_str();
83 if (token == "default")
85 #if (defined __i386__ || defined __x86_64__) && defined _GLIBCXX_X86_RDRAND
86 unsigned int eax, ebx, ecx, edx;
87 // Check availability of cpuid and, for now at least, also the
88 // CPU signature for Intel's
89 if (__get_cpuid_max(0, &ebx) > 0 && ebx == signature_INTEL_ebx)
91 __cpuid(1, eax, ebx, ecx, edx);
100 fname = "/dev/urandom";
102 else if (token != "/dev/urandom" && token != "/dev/random")
104 std::__throw_runtime_error(__N("random_device::"
105 "random_device(const std::string&)"));
107 _M_file = static_cast<void*>(std::fopen(fname, "rb"));
113 random_device::_M_init_pretr1(const std::string& token)
115 _M_mt.seed(_M_strtoul(token));
119 random_device::_M_fini()
122 std::fclose(static_cast<FILE*>(_M_file));
125 random_device::result_type
126 random_device::_M_getval()
128 #if (defined __i386__ || defined __x86_64__) && defined _GLIBCXX_X86_RDRAND
130 return __x86_rdrand();
135 size_t n = sizeof(result_type);
136 #ifdef _GLIBCXX_HAVE_UNISTD_H
139 const int e = read(fileno(static_cast<FILE*>(_M_file)), p, n);
143 p = static_cast<char*>(p) + e;
145 else if (e != -1 || errno != EINTR)
146 __throw_runtime_error(__N("random_device could not be read"));
150 const size_t e = std::fread(p, n, 1, static_cast<FILE*>(_M_file));
152 __throw_runtime_error(__N("random_device could not be read"));
158 random_device::result_type
159 random_device::_M_getval_pretr1()
164 template class mersenne_twister_engine<
170 0xefc60000UL, 18, 1812433253UL>;