Release Cosmopolitan v3.6.0

This release is an atomic upgrade to GCC 14.1.0 with C23 and C++23

third_party/libcxx/random.cpp

@@ -0,0 +1,181 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include <__config>
+
+#if defined(_LIBCPP_USING_WIN32_RANDOM)
+// Must be defined before including stdlib.h to enable rand_s().
+#  define _CRT_RAND_S
+#endif // defined(_LIBCPP_USING_WIN32_RANDOM)
+
+#include <__system_error/system_error.h>
+#include <limits>
+#include <random>
+
+#include <errno.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+#if defined(_LIBCPP_USING_GETENTROPY)
+#  include <sys/random.h>
+#elif defined(_LIBCPP_USING_DEV_RANDOM)
+#  include <fcntl.h>
+#  include <unistd.h>
+#  if __has_include(<sys/ioctl.h>) && __has_include(<linux/random.h>)
+#    include <linux/random.h>
+#    include <sys/ioctl.h>
+#  endif
+#elif defined(_LIBCPP_USING_NACL_RANDOM)
+#  include <nacl/nacl_random.h>
+#elif defined(_LIBCPP_USING_FUCHSIA_CPRNG)
+#  include <zircon/syscalls.h>
+#endif
+
+_LIBCPP_BEGIN_NAMESPACE_STD
+
+#if defined(_LIBCPP_USING_GETENTROPY)
+
+random_device::random_device(const string& __token) {
+  if (__token != "/dev/urandom")
+    __throw_system_error(ENOENT, ("random device not supported " + __token).c_str());
+}
+
+random_device::~random_device() {}
+
+unsigned random_device::operator()() {
+  unsigned r;
+  size_t n = sizeof(r);
+  int err  = getentropy(&r, n);
+  if (err)
+    __throw_system_error(errno, "random_device getentropy failed");
+  return r;
+}
+
+#elif defined(_LIBCPP_USING_ARC4_RANDOM)
+
+random_device::random_device(const string&) {}
+
+random_device::~random_device() {}
+
+unsigned random_device::operator()() { return arc4random(); }
+
+#elif defined(_LIBCPP_USING_DEV_RANDOM)
+
+random_device::random_device(const string& __token) : __f_(open(__token.c_str(), O_RDONLY)) {
+  if (__f_ < 0)
+    __throw_system_error(errno, ("random_device failed to open " + __token).c_str());
+}
+
+random_device::~random_device() { close(__f_); }
+
+unsigned random_device::operator()() {
+  unsigned r;
+  size_t n = sizeof(r);
+  char* p  = reinterpret_cast<char*>(&r);
+  while (n > 0) {
+    ssize_t s = read(__f_, p, n);
+    if (s == 0)
+      __throw_system_error(ENOMSG, "random_device got EOF");
+    if (s == -1) {
+      if (errno != EINTR)
+        __throw_system_error(errno, "random_device got an unexpected error");
+      continue;
+    }
+    n -= static_cast<size_t>(s);
+    p += static_cast<size_t>(s);
+  }
+  return r;
+}
+
+#elif defined(_LIBCPP_USING_NACL_RANDOM)
+
+random_device::random_device(const string& __token) {
+  if (__token != "/dev/urandom")
+    __throw_system_error(ENOENT, ("random device not supported " + __token).c_str());
+  int error = nacl_secure_random_init();
+  if (error)
+    __throw_system_error(error, ("random device failed to open " + __token).c_str());
+}
+
+random_device::~random_device() {}
+
+unsigned random_device::operator()() {
+  unsigned r;
+  size_t n = sizeof(r);
+  size_t bytes_written;
+  int error = nacl_secure_random(&r, n, &bytes_written);
+  if (error != 0)
+    __throw_system_error(error, "random_device failed getting bytes");
+  else if (bytes_written != n)
+    __throw_runtime_error("random_device failed to obtain enough bytes");
+  return r;
+}
+
+#elif defined(_LIBCPP_USING_WIN32_RANDOM)
+
+random_device::random_device(const string& __token) {
+  if (__token != "/dev/urandom")
+    __throw_system_error(ENOENT, ("random device not supported " + __token).c_str());
+}
+
+random_device::~random_device() {}
+
+unsigned random_device::operator()() {
+  unsigned r;
+  errno_t err = rand_s(&r);
+  if (err)
+    __throw_system_error(err, "random_device rand_s failed.");
+  return r;
+}
+
+#elif defined(_LIBCPP_USING_FUCHSIA_CPRNG)
+
+random_device::random_device(const string& __token) {
+  if (__token != "/dev/urandom")
+    __throw_system_error(ENOENT, ("random device not supported " + __token).c_str());
+}
+
+random_device::~random_device() {}
+
+unsigned random_device::operator()() {
+  // Implicitly link against the vDSO system call ABI without
+  // requiring the final link to specify -lzircon explicitly when
+  // statically linking libc++.
+#  pragma comment(lib, "zircon")
+
+  // The system call cannot fail.  It returns only when the bits are ready.
+  unsigned r;
+  _zx_cprng_draw(&r, sizeof(r));
+  return r;
+}
+
+#else
+#  error "Random device not implemented for this architecture"
+#endif
+
+double random_device::entropy() const noexcept {
+#if defined(_LIBCPP_USING_DEV_RANDOM) && defined(RNDGETENTCNT)
+  int ent;
+  if (::ioctl(__f_, RNDGETENTCNT, &ent) < 0)
+    return 0;
+
+  if (ent < 0)
+    return 0;
+
+  if (ent > std::numeric_limits<result_type>::digits)
+    return std::numeric_limits<result_type>::digits;
+
+  return ent;
+#elif defined(_LIBCPP_USING_ARC4_RANDOM) || defined(_LIBCPP_USING_FUCHSIA_CPRNG)
+  return std::numeric_limits<result_type>::digits;
+#else
+  return 0;
+#endif
+}
+
+_LIBCPP_END_NAMESPACE_STD