mirror of
https://github.com/saitohirga/WSJT-X.git
synced 2024-11-22 04:11:16 -05:00
115 lines
3.7 KiB
C++
115 lines
3.7 KiB
C++
#include "NonInheritingProcess.hpp"
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#ifdef Q_OS_WIN
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#ifndef WIN32_LEAN_AND_MEAN
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#define WIN32_LEAN_AND_MEAN
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#endif
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#ifndef NOMINMAX
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#define NOMINMAX
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#endif
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#ifndef _UNICODE
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#define _UNICODE
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#endif
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#ifdef _WIN32_WINNT
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#undef _WIN32_WINNT
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#endif
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#define _WIN32_WINNT 0x0601
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#include <windows.h>
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#endif
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#include <memory>
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#include <functional>
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#include "pimpl_impl.hpp"
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namespace
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{
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struct start_info_deleter
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{
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void operator () (STARTUPINFOEXW * si)
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{
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if (si->lpAttributeList)
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{
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::DeleteProcThreadAttributeList (si->lpAttributeList);
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}
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delete si;
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}
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};
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}
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class NonInheritingProcess::impl
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{
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public:
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#ifdef Q_OS_WIN
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void extend_CreateProcessArguments (QProcess::CreateProcessArguments * args)
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{
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//
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// Here we modify the CreateProcessArguments structure to use a
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// STARTUPINFOEX extended argument to CreateProcess. In that we
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// set up a list of handles for the new process to inherit. By
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// doing this we stop all inherited handles from being
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// inherited. Unfortunately UpdateProcThreadAttribute does not let
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// us set up an empty handle list, so we populate the list with
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// the three standard stream handles that QProcess::start has set
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// up as Pipes to do IPC. Even though these Pipe handles are
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// created with inheritance disabled, UpdateProcThreadAtribute and
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// CreateProcess don't seem to mind, which suits us fine.
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//
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// Note: that we cannot just clear the inheritHandles flag as that
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// stops the standard stream handles being inherited which breaks
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// our IPC using std(in|out|err). Only be using a
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// PROC_THREAD_ATTRIBUTE_HANDLE_LIST attribute in a STARTUPINFOEX
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// structure can we avoid the all or nothing behaviour of
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// CreateProcess /w respect to handle inheritance.
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//
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BOOL fSuccess;
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SIZE_T size {0};
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LPPROC_THREAD_ATTRIBUTE_LIST lpAttributeList = nullptr;
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::InitializeProcThreadAttributeList (nullptr, 1, 0, &size);
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lpAttributeList = reinterpret_cast<LPPROC_THREAD_ATTRIBUTE_LIST> (::HeapAlloc (::GetProcessHeap (), 0, size));
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fSuccess = !!lpAttributeList;
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if (fSuccess)
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{
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fSuccess = ::InitializeProcThreadAttributeList (lpAttributeList, 1, 0, &size);
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}
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if (fSuccess)
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{
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// empty list of handles
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fSuccess = ::UpdateProcThreadAttribute (lpAttributeList, 0,
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PROC_THREAD_ATTRIBUTE_HANDLE_LIST,
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&args->startupInfo->hStdInput, 3 * sizeof (HANDLE),
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nullptr, 0);
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}
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if (fSuccess)
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{
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start_info_.reset (new STARTUPINFOEXW);
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start_info_->StartupInfo = *args->startupInfo;
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start_info_->StartupInfo.cb = sizeof (STARTUPINFOEXW);
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start_info_->lpAttributeList = lpAttributeList;
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args->startupInfo = reinterpret_cast<Q_STARTUPINFO*> (start_info_.get ());
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args->flags |= EXTENDED_STARTUPINFO_PRESENT;
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}
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}
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using start_info_type = std::unique_ptr<STARTUPINFOEXW, start_info_deleter>;
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start_info_type start_info_;
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#endif
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};
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NonInheritingProcess::NonInheritingProcess (QObject * parent)
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: QProcess {parent}
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{
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#ifdef Q_OS_WIN
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using namespace std::placeholders;
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// enable cleanup after process starts or fails to start
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connect (this, &QProcess::started, [this] {m_->start_info_.reset ();});
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connect (this, &QProcess::errorOccurred, [this] (QProcess::ProcessError) {m_->start_info_.reset ();});
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setCreateProcessArgumentsModifier (std::bind (&NonInheritingProcess::impl::extend_CreateProcessArguments, &*m_, _1));
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#endif
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}
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NonInheritingProcess::~NonInheritingProcess ()
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{
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}
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