/// <summary>
/// Creates the shared memory region and map a view to it.
/// </summary>
private void InitializeMemoryMapping(string memoryMapName, bool allowExistingMapping)
{
// Null means use the default security permissions
IntPtr pointerToSecurityAttributes = NativeMethods.NullPtr;
IntPtr pSDNative = IntPtr.Zero;
try
{
// Check to see if the user is an administrator, this is done to prevent non
// administrator processes from accessing the shared memory. On a vista machine
// the check does not differentiate beween the application being elevated to have
// administrator rights or the application being started with administrator rights.
// If the user is an administator create a new set of securityAttributes which make
// the shared memory only accessable to administrators.
if (NativeMethods.IsUserAdministrator())
{
NativeMethods.SECURITY_ATTRIBUTES saAttr = new NativeMethods.SECURITY_ATTRIBUTES();
uint pSDLength = 0;
if (!NativeMethods.ConvertStringSecurityDescriptorToSecurityDescriptor(NativeMethods.ADMINONLYSDDL, NativeMethods.SECURITY_DESCRIPTOR_REVISION, ref pSDNative, ref pSDLength))
{
throw new System.ComponentModel.Win32Exception();
}
saAttr.bInheritHandle = 0;
saAttr.nLength = Marshal.SizeOf(typeof(NativeMethods.SECURITY_ATTRIBUTES));
saAttr.lpSecurityDescriptor = pSDNative;
pointerToSecurityAttributes = Marshal.AllocHGlobal(Marshal.SizeOf(typeof(NativeMethods.SECURITY_ATTRIBUTES)));
Marshal.StructureToPtr(saAttr, pointerToSecurityAttributes, true);
}
// The file mapping has either the default (current user) security permissions or
// permissions restricted to only administrator users depending on the check above.
// If pointerToSecurityAttributes is null the default permissions are used.
this.pageFileMapping =
NativeMethods.CreateFileMapping
(
NativeMethods.InvalidHandle,
pointerToSecurityAttributes,
NativeMethods.PAGE_READWRITE,
0,
size + 4,
memoryMapName
);
// If only new mappings are allowed and the current one has been created by somebody else
// delete the mapping. Note that we would like to compare the GetLastError value against
// ERROR_ALREADY_EXISTS but CLR sometimes overwrites the last error so to be safe we'll
// not reuse the node for any unsuccessful value.
if (!allowExistingMapping && Marshal.GetLastWin32Error() != NativeMethods.ERROR_SUCCESS)
{
if (!pageFileMapping.IsInvalid && !pageFileMapping.IsClosed)
{
NativeMethods.UnmapViewOfFile(pageFileView);
pageFileMapping.Close();
}
}
}
finally
{
NativeMethods.LocalFree(pointerToSecurityAttributes);
NativeMethods.LocalFree(pSDNative);
}
if (!this.pageFileMapping.IsInvalid && !pageFileMapping.IsClosed)
{
// Maps a view of a file mapping into the address space of the calling process so that we can use the
// view to read and write to the shared memory region.
this.pageFileView =
NativeMethods.MapViewOfFile
(
this.pageFileMapping,
NativeMethods.FILE_MAP_ALL_ACCESS, // Give the map read, write, and copy access
0, // Start mapped view at high order offset 0
0, // Start mapped view at low order offset 0
// The size of the shared memory plus some extra space for an int
// to write the number of bytes written
(IntPtr)(size + 4)
);
// Check to see if the file view has been created on the fileMapping.
if (this.pageFileView == NativeMethods.NullPtr)
{
// Make the shared memory not usable.
this.pageFileMapping.Close();
}
else
{
this.name = memoryMapName;
}
}
}
/// <summary>
/// Creates the shared memory region and map a view to it.
/// </summary>
private void InitializeMemoryMapping(string memoryMapName, bool allowExistingMapping)
{
// Null means use the default security permissions
IntPtr pointerToSecurityAttributes = NativeMethods.NullPtr;
IntPtr pSDNative = IntPtr.Zero;
try
{
// Check to see if the user is an administrator, this is done to prevent non
// administrator processes from accessing the shared memory. On a vista machine
// the check does not differentiate beween the application being elevated to have
// administrator rights or the application being started with administrator rights.
// If the user is an administator create a new set of securityAttributes which make
// the shared memory only accessable to administrators.
if (NativeMethods.IsUserAdministrator())
{
NativeMethods.SECURITY_ATTRIBUTES saAttr = new NativeMethods.SECURITY_ATTRIBUTES();
uint pSDLength = 0;
if (!NativeMethods.ConvertStringSecurityDescriptorToSecurityDescriptor(NativeMethods.ADMINONLYSDDL, NativeMethods.SECURITY_DESCRIPTOR_REVISION, ref pSDNative, ref pSDLength))
{
throw new System.ComponentModel.Win32Exception();
}
saAttr.bInheritHandle = 0;
saAttr.nLength = Marshal.SizeOf(typeof(NativeMethods.SECURITY_ATTRIBUTES));
saAttr.lpSecurityDescriptor = pSDNative;
pointerToSecurityAttributes = Marshal.AllocHGlobal(Marshal.SizeOf(typeof(NativeMethods.SECURITY_ATTRIBUTES)));
Marshal.StructureToPtr(saAttr, pointerToSecurityAttributes, true);
}
// The file mapping has either the default (current user) security permissions or
// permissions restricted to only administrator users depending on the check above.
// If pointerToSecurityAttributes is null the default permissions are used.
this.pageFileMapping =
NativeMethods.CreateFileMapping
(
NativeMethods.InvalidHandle,
pointerToSecurityAttributes,
NativeMethods.PAGE_READWRITE,
0,
size + 4,
memoryMapName
);
// If only new mappings are allowed and the current one has been created by somebody else
// delete the mapping. Note that we would like to compare the GetLastError value against
// ERROR_ALREADY_EXISTS but CLR sometimes overwrites the last error so to be safe we'll
// not reuse the node for any unsuccessful value.
if (!allowExistingMapping && Marshal.GetLastWin32Error() != NativeMethods.ERROR_SUCCESS)
{
if (!pageFileMapping.IsInvalid && !pageFileMapping.IsClosed)
{
NativeMethods.UnmapViewOfFile(pageFileView);
pageFileMapping.Close();
}
}
}
finally
{
NativeMethods.LocalFree(pointerToSecurityAttributes);
NativeMethods.LocalFree(pSDNative);
}
if (!this.pageFileMapping.IsInvalid && !pageFileMapping.IsClosed)
{
// Maps a view of a file mapping into the address space of the calling process so that we can use the
// view to read and write to the shared memory region.
this.pageFileView =
NativeMethods.MapViewOfFile
(
this.pageFileMapping,
NativeMethods.FILE_MAP_ALL_ACCESS, // Give the map read, write, and copy access
0, // Start mapped view at high order offset 0
0, // Start mapped view at low order offset 0
// The size of the shared memory plus some extra space for an int
// to write the number of bytes written
(IntPtr)(size + 4)
);
// Check to see if the file view has been created on the fileMapping.
if (this.pageFileView == NativeMethods.NullPtr)
{
// Make the shared memory not usable.
this.pageFileMapping.Close();
}
else
{
this.name = memoryMapName;
}
}
}
/// <summary>
/// This function launches a new node given a node index
/// </summary>
private void LaunchNode(int nodeIndex)
{
EventWaitHandle nodeReadyEvent = null;
string msbuildLocation = Path.Combine(locationOfMSBuildExe, "MSBuild.exe");
ErrorUtilities.VerifyThrow(File.Exists(msbuildLocation),"Msbuild.exe cannot be found at: "+msbuildLocation);
bool exitedDueToError = true;
try
{
NativeMethods.STARTUPINFO startInfo = new NativeMethods.STARTUPINFO();
startInfo.cb = Marshal.SizeOf(startInfo);
uint dwCreationFlags = NativeMethods.NORMAL_PRIORITY_CLASS;
if (!Engine.debugMode)
{
startInfo.hStdError = NativeMethods.InvalidHandle;
startInfo.hStdInput = NativeMethods.InvalidHandle;
startInfo.hStdOutput = NativeMethods.InvalidHandle;
startInfo.dwFlags = NativeMethods.STARTF_USESTDHANDLES;
dwCreationFlags = dwCreationFlags | NativeMethods.CREATE_NO_WINDOW;
}
NativeMethods.SECURITY_ATTRIBUTES pSec = new NativeMethods.SECURITY_ATTRIBUTES();
NativeMethods.SECURITY_ATTRIBUTES tSec = new NativeMethods.SECURITY_ATTRIBUTES();
pSec.nLength = Marshal.SizeOf(pSec);
tSec.nLength = Marshal.SizeOf(tSec);
NativeMethods.PROCESS_INFORMATION pInfo = new NativeMethods.PROCESS_INFORMATION();
string appName = msbuildLocation;
// Repeat the executable name as the first token of the command line because the command line
// parser logic expects it and will otherwise skip the first argument
string cmdLine = msbuildLocation + " /nologo /oldom /nodemode:" + nodeData[nodeIndex].NodeNumber;
NativeMethods.CreateProcess(appName, cmdLine,
ref pSec, ref tSec,
false, dwCreationFlags,
NativeMethods.NullPtr, null, ref startInfo, out pInfo);
nodeReadyEvent = new EventWaitHandle(false, EventResetMode.ManualReset, LocalNodeProviderGlobalNames.NodeActiveEventName(nodeData[nodeIndex].NodeNumber));
// Wait until the node is ready to process the requests
if (nodeReadyEvent.WaitOne(launchTimeout, false))
{
exitedDueToError = false;
}
}
finally
{
// Dispose before losing scope
if (nodeReadyEvent != null)
{
nodeReadyEvent.Close();
}
if (exitedDueToError)
{
nodeData[nodeIndex].CommunicationFailed = true;
}
}
}
