Create a HostProcess class.

This is a lightweight wrapper around a pid.  It is intended to be
lightweight enough to serve as a replacement anywhere we currently
store a pid.  It provides convenience methods and common process
operations.

This patch does not yet make use of HostProcess anywhere.

llvm-svn: 216607

lldb/source/Host/windows/HostProcessWindows.cpp

@@ -0,0 +1,112 @@
+//===-- HostProcessWindows.cpp ----------------------------------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#include "lldb/Host/windows/windows.h"
+
+#include <Psapi.h>
+
+#include "lldb/Host/windows/HostProcessWindows.h"
+
+#include "llvm/ADT/STLExtras.h"
+
+using namespace lldb_private;
+
+HostProcessWindows::HostProcessWindows()
+    : m_process(NULL)
+    , m_pid(0)
+{
+}
+
+HostProcessWindows::~HostProcessWindows()
+{
+    Close();
+}
+
+Error HostProcessWindows::Create(lldb::pid_t pid)
+{
+    Error error;
+    if (pid == m_pid)
+        return error;
+    Close();
+
+    m_process = ::OpenProcess(PROCESS_TERMINATE | PROCESS_QUERY_LIMITED_INFORMATION, FALSE, pid);
+    if (m_process == NULL)
+    {
+        error.SetError(::GetLastError(), lldb::eErrorTypeWin32);
+        return error;
+    }
+    m_pid = pid;
+    return error;
+}
+
+Error HostProcessWindows::Create(lldb::process_t process)
+{
+    Error error;
+    if (process == m_process)
+        return error;
+    Close();
+
+    m_pid = ::GetProcessId(process);
+    if (m_pid == 0)
+        error.SetError(::GetLastError(), lldb::eErrorTypeWin32);
+    m_process = process;
+    return error;
+}
+
+Error HostProcessWindows::Terminate()
+{
+    Error error;
+    if (m_process == NULL)
+        error.SetError(ERROR_INVALID_HANDLE, lldb::eErrorTypeWin32);
+
+    if (!::TerminateProcess(m_process, 0))
+        error.SetError(::GetLastError(), lldb::eErrorTypeWin32);
+
+    return error;
+}
+
+Error HostProcessWindows::GetMainModule(FileSpec &file_spec) const
+{
+    Error error;
+    if (m_process == NULL)
+        error.SetError(ERROR_INVALID_HANDLE, lldb::eErrorTypeWin32);
+
+    char path[MAX_PATH] = { 0 };
+    if (::GetProcessImageFileName(m_process, path, llvm::array_lengthof(path)))
+        file_spec.SetFile(path, false);
+    else
+        error.SetError(::GetLastError(), lldb::eErrorTypeWin32);
+
+    return error;
+}
+
+lldb::pid_t HostProcessWindows::GetProcessId() const
+{
+    return m_pid;
+}
+
+bool HostProcessWindows::IsRunning() const
+{
+    if (m_process == NULL)
+        return false;
+
+    DWORD code = 0;
+    if (!::GetExitCodeProcess(m_process, &code))
+        return false;
+
+    return (code == STILL_ACTIVE);
+}
+
+void HostProcessWindows::Close()
+{
+    if (m_process != NULL)
+        ::CloseHandle(m_process);
+    m_process = nullptr;
+    m_pid = 0;
+}