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System.cpp
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System.cpp
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/*
===========================================================================
Daemon BSD Source Code
Copyright (c) 2013-2016, Daemon Developers
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:
* Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
* Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution.
* Neither the name of the Daemon developers nor the
names of its contributors may be used to endorse or promote products
derived from this software without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL DAEMON DEVELOPERS BE LIABLE FOR ANY
DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
===========================================================================
*/
#include "Common.h"
#ifdef _WIN32
#include <windows.h>
#else
#include <unistd.h>
#include <fcntl.h>
#include <signal.h>
#ifdef __linux__
#include <linux/version.h>
#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,17,0)
#include <sys/syscall.h>
#include <linux/random.h>
#define HAS_GETRANDOM_SYSCALL 1
#endif
#endif
#ifdef __native_client__
#include <nacl/nacl_exception.h>
#include <nacl/nacl_minidump.h>
#include <nacl/nacl_random.h>
#include "shared/CommonProxies.h"
#else
#include <dlfcn.h>
#endif
#endif
namespace Sys {
#ifdef _WIN32
SteadyClock::time_point SteadyClock::now() NOEXCEPT
{
// Determine performance counter frequency
static double nanosec_per_tic = 0.0;
if (nanosec_per_tic == 0.0) {
LARGE_INTEGER freq;
QueryPerformanceFrequency(&freq);
nanosec_per_tic = 1000000000.0 / freq.QuadPart;
}
LARGE_INTEGER time;
QueryPerformanceCounter(&time);
return time_point(duration(rep(nanosec_per_tic * time.QuadPart)));
}
#endif
void SleepFor(SteadyClock::duration time)
{
#ifdef _WIN32
static ULONG maxRes = 0;
static NTSTATUS(WINAPI *pNtSetTimerResolution) (ULONG resolution, BOOLEAN set_resolution, ULONG* current_resolution);
static NTSTATUS(WINAPI *pNtDelayExecution) (BOOLEAN alertable, const LARGE_INTEGER* timeout);
if (maxRes == 0) {
// Load ntdll.dll functions
std::string errorString;
DynamicLib ntdll = DynamicLib::Open("ntdll.dll", errorString);
if (!ntdll)
Sys::Error("Failed to load ntdll.dll: %s", errorString);
auto pNtQueryTimerResolution = ntdll.LoadSym<NTSTATUS WINAPI(ULONG*, ULONG*, ULONG*)>("NtQueryTimerResolution", errorString);
if (!pNtQueryTimerResolution)
Sys::Error("Failed to load NtQueryTimerResolution from ntdll.dll: %s", errorString);
pNtSetTimerResolution = ntdll.LoadSym<NTSTATUS WINAPI(ULONG, BOOLEAN, ULONG*)>("NtSetTimerResolution", errorString);
if (!pNtSetTimerResolution)
Sys::Error("Failed to load NtSetTimerResolution from ntdll.dll: %s", errorString);
pNtDelayExecution = ntdll.LoadSym<NTSTATUS WINAPI(BOOLEAN, const LARGE_INTEGER*)>("NtDelayExecution", errorString);
if (!pNtDelayExecution)
Sys::Error("Failed to load NtDelayExecution from ntdll.dll: %s", errorString);
// Determine the maximum available timer resolution
ULONG minRes, curRes;
if (pNtQueryTimerResolution(&minRes, &maxRes, &curRes) != 0)
maxRes = 10000; // Default to 1ms
}
// Increase the system timer resolution for the duration of the sleep
ULONG curRes;
pNtSetTimerResolution(maxRes, TRUE, &curRes);
// Convert to NT units of 100ns
using NTDuration = std::chrono::duration<int64_t, std::ratio<1, 10000000>>;
auto ntTime = std::chrono::duration_cast<NTDuration>(time);
// Store the delay as a negative number to indicate a relative sleep
LARGE_INTEGER duration;
duration.QuadPart = -ntTime.count();
pNtDelayExecution(FALSE, &duration);
// Restore timer resolution after sleeping
pNtSetTimerResolution(maxRes, FALSE, &curRes);
#else
std::this_thread::sleep_for(time);
#endif
}
SteadyClock::time_point SleepUntil(SteadyClock::time_point time)
{
// Early exit if we are already past the deadline
auto now = SteadyClock::now();
if (now >= time) {
// We were already past our deadline, which means that the previous frame
// ran for too long. Use the current time as the base for the next frame.
return now;
}
// Perform the actual sleep
SleepFor(time - now);
// We may have overslept, so use the target time rather than the
// current time as the base for the next frame. That way we ensure
// that the frame rate remains consistent.
return time;
}
void Drop(Str::StringRef message)
{
// Transform into a fatal error if too many errors are generated in quick
// succession.
static Sys::SteadyClock::time_point lastError;
Sys::SteadyClock::time_point now = Sys::SteadyClock::now();
static int errorCount = 0;
if (now - lastError < std::chrono::milliseconds(100)) {
if (++errorCount > 3)
Sys::Error(message);
} else
errorCount = 0;
lastError = now;
throw DropErr(message.c_str());
}
#ifdef _WIN32
std::string Win32StrError(uint32_t error)
{
std::string out;
char* message;
if (FormatMessage(FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_IGNORE_INSERTS | FORMAT_MESSAGE_FROM_SYSTEM, nullptr, error, MAKELANGID(LANG_NEUTRAL,SUBLANG_DEFAULT), reinterpret_cast<char *>(&message), 0, nullptr)) {
out = message;
// FormatMessage adds ".\r\n" to messages, but we don't want those
if (out.back() == '\n')
out.pop_back();
if (out.back() == '\r')
out.pop_back();
if (out.back() == '.')
out.pop_back();
LocalFree(message);
} else
out = Str::Format("Unknown error 0x%08lx", error);
return out;
}
#endif
// Setup crash handling
#ifdef _WIN32
static const char *WindowsExceptionString(DWORD code)
{
switch (code) {
case EXCEPTION_ACCESS_VIOLATION:
return "Access violation";
case EXCEPTION_ARRAY_BOUNDS_EXCEEDED:
return "Array bounds exceeded";
case EXCEPTION_BREAKPOINT:
return "Breakpoint was encountered";
case EXCEPTION_DATATYPE_MISALIGNMENT:
return "Datatype misalignment";
case EXCEPTION_FLT_DENORMAL_OPERAND:
return "Float: Denormal operand";
case EXCEPTION_FLT_DIVIDE_BY_ZERO:
return "Float: Divide by zero";
case EXCEPTION_FLT_INEXACT_RESULT:
return "Float: Inexact result";
case EXCEPTION_FLT_INVALID_OPERATION:
return "Float: Invalid operation";
case EXCEPTION_FLT_OVERFLOW:
return "Float: Overflow";
case EXCEPTION_FLT_STACK_CHECK:
return "Float: Stack check";
case EXCEPTION_FLT_UNDERFLOW:
return "Float: Underflow";
case EXCEPTION_ILLEGAL_INSTRUCTION:
return "Illegal instruction";
case EXCEPTION_IN_PAGE_ERROR:
return "Page error";
case EXCEPTION_INT_DIVIDE_BY_ZERO:
return "Integer: Divide by zero";
case EXCEPTION_INT_OVERFLOW:
return "Integer: Overflow";
case EXCEPTION_INVALID_DISPOSITION:
return "Invalid disposition";
case EXCEPTION_NONCONTINUABLE_EXCEPTION:
return "Noncontinuable exception";
case EXCEPTION_PRIV_INSTRUCTION:
return "Privileged instruction";
case EXCEPTION_SINGLE_STEP:
return "Single step";
case EXCEPTION_STACK_OVERFLOW:
return "Stack overflow";
default:
return "Unknown exception";
}
}
static LONG WINAPI CrashHandler(PEXCEPTION_POINTERS ExceptionInfo)
{
// Reset handler so that any future errors cause a crash
SetUnhandledExceptionFilter(nullptr);
// TODO: backtrace
Sys::Error("Crashed with exception 0x%lx: %s", ExceptionInfo->ExceptionRecord->ExceptionCode, WindowsExceptionString(ExceptionInfo->ExceptionRecord->ExceptionCode));
return EXCEPTION_CONTINUE_EXECUTION;
}
void SetupCrashHandler()
{
SetUnhandledExceptionFilter(CrashHandler);
}
#elif defined(__native_client__)
static void CrashHandler(const void* data, size_t n)
{
VM::CrashDump(static_cast<const uint8_t*>(data), n);
Sys::Error("Crashed with NaCl exception");
}
void SetupCrashHandler()
{
nacl_minidump_register_crash_handler();
nacl_minidump_set_callback(CrashHandler);
}
#else
static void CrashHandler(int sig)
{
// TODO: backtrace
Sys::Error("Crashed with signal %d: %s", sig, strsignal(sig));
}
void SetupCrashHandler()
{
struct sigaction sa;
sa.sa_flags = SA_RESETHAND | SA_NODEFER;
sa.sa_handler = CrashHandler;
sigemptyset(&sa.sa_mask);
for (int sig: {SIGILL, SIGFPE, SIGSEGV, SIGABRT, SIGBUS, SIGTRAP})
sigaction(sig, &sa, nullptr);
}
#endif
#ifndef __native_client__
void DynamicLib::Close()
{
if (!handle)
return;
#ifdef _WIN32
FreeLibrary(static_cast<HMODULE>(handle));
#else
dlclose(handle);
#endif
handle = nullptr;
}
DynamicLib DynamicLib::Open(Str::StringRef filename, std::string& errorString)
{
#ifdef _WIN32
void* handle = LoadLibraryW(Str::UTF8To16(filename).c_str());
if (!handle)
errorString = Win32StrError(GetLastError());
#else
// Handle relative paths correctly
const char* dlopenFilename = filename.c_str();
std::string relativePath;
if (filename.find('/') == std::string::npos) {
relativePath = "./" + filename;
dlopenFilename = relativePath.c_str();
}
void* handle = dlopen(dlopenFilename, RTLD_NOW);
if (!handle)
errorString = dlerror();
#endif
DynamicLib out;
out.handle = handle;
return out;
}
intptr_t DynamicLib::InternalLoadSym(Str::StringRef sym, std::string& errorString)
{
#ifdef _WIN32
intptr_t p = reinterpret_cast<intptr_t>(GetProcAddress(static_cast<HMODULE>(handle), sym.c_str()));
if (!p)
errorString = Win32StrError(GetLastError());
return p;
#else
intptr_t p = reinterpret_cast<intptr_t>(dlsym(handle, sym.c_str()));
if (!p)
errorString = dlerror();
return p;
#endif
}
#endif // __native_client__
bool processTerminating = false;
void OSExit(int exitCode) {
processTerminating = true;
exit(exitCode);
}
bool IsProcessTerminating() {
return processTerminating;
}
void GenRandomBytes(void* dest, size_t size)
{
#ifdef _WIN32
HCRYPTPROV prov;
if (!CryptAcquireContext(&prov, NULL, NULL, PROV_RSA_FULL, CRYPT_VERIFYCONTEXT))
Sys::Error("CryptAcquireContext failed: %s", Win32StrError(GetLastError()));
if (!CryptGenRandom(prov, size, (BYTE*)dest))
Sys::Error("CryptGenRandom failed: %s", Win32StrError(GetLastError()));
CryptReleaseContext(prov, 0);
#elif defined(__native_client__)
size_t bytes_written;
if (nacl_secure_random(dest, size, &bytes_written) != 0 || bytes_written != size)
Sys::Error("nacl_secure_random failed");
#elif defined(__linux__) && defined(HAS_GETRANDOM_SYSCALL)
if (syscall(SYS_getrandom, dest, size, GRND_NONBLOCK) == -1)
Sys::Error("Failed getrandom syscall: %s", strerror(errno));
#elif defined(__linux__)
int fd = open("/dev/urandom", O_RDONLY);
if (fd == -1)
Sys::Error("Failed to open /dev/urandom: %s", strerror(errno));
if (read(fd, dest, size) != (ssize_t) size)
Sys::Error("Failed to read from /dev/urandom: %s", strerror(errno));
close(fd);
#else
arc4random_buf(dest, size);
#endif
}
} // namespace Sys
// Global operator new/delete override to not throw an exception when out of
// memory. Instead, it is preferable to simply crash with an error.
void* operator new(size_t n)
{
void* p = malloc(n);
if (!p)
Sys::Error("Out of memory");
return p;
}
void operator delete(void* p) NOEXCEPT
{
if (!Sys::processTerminating) {
free(p);
}
}
/**
* Both client and server can use this, and it will
* do the appropriate things.
*/
void QDECL PRINTF_LIKE(2) Com_Error(errorParm_t code, const char *fmt, ...)
{
char buf[4096];
va_list argptr;
va_start(argptr, fmt);
Q_vsnprintf(buf, sizeof(buf), fmt, argptr);
va_end(argptr);
if (code == errorParm_t::ERR_FATAL)
Sys::Error(buf);
else
Sys::Drop(buf);
}