/// <summary>
/// Process the read/write queues of the specified pipe.
/// </summary>
/// <param name="pipe">The pipe to process.</param>
/// <param name="OutProcess">The process which owns the pipe's outpoint.</param>
/// <param name="InProcess">The process which owns the pipe's inpoint.</param>
private static void ProcessPipeQueue(Pipe pipe, Process OutProcess, Process InProcess)
{
#if PIPES_TRACE
BasicConsole.WriteLine("ProcessPipeQueue: Checking first loop condition");
#endif
while ((pipe.AreThreadsWaitingToWrite() && pipe.CanWrite()) || (pipe.AreThreadsWaitingToRead() && pipe.CanRead()))
{
#if PIPES_TRACE
BasicConsole.WriteLine("ProcessPipeQueue: Loop start");
#endif
if (pipe.AreThreadsWaitingToWrite() && pipe.CanWrite())
{
#if PIPES_TRACE
BasicConsole.WriteLine("ProcessPipeQueue: Pipe can write");
#endif
/* - Dequeue thread to write
* - Find thread to write
* - Load pointer to request structure from thread's stack
* - Write pipe
* - Setup return values for thread
* - Wake thread
* - Loop back
*/
#if PIPES_TRACE
BasicConsole.WriteLine("ProcessPipeQueue: Dequeuing out thread id");
#endif
UInt32 ThreadId;
if (!pipe.DequeueToWrite(out ThreadId))
{
break;
}
#if PIPES_TRACE
BasicConsole.WriteLine("ProcessPipeQueue: Getting out thread");
#endif
Thread WriteThread = ProcessManager.GetThreadById(ThreadId, OutProcess);
if (WriteThread == null)
{
break;
}
#if PIPES_TRACE
BasicConsole.WriteLine("ProcessPipeQueue: Writing pipe");
#endif
WritePipeRequest* Request = (WritePipeRequest*)WriteThread.Param1;
bool Successful = pipe.Write(Request->InBuffer, Request->Offset, Request->Length);
if (Successful)
{
#if PIPES_TRACE
BasicConsole.WriteLine("ProcessPipeQueue: Write successful");
#endif
WriteThread.Return1 = (uint)SystemCallResults.OK;
WriteThread._Wake();
}
else
{
#if PIPES_TRACE
BasicConsole.WriteLine("ProcessPipeQueue: Write failed");
#endif
WriteThread.Return1 = (uint)SystemCallResults.Fail;
WriteThread._Wake();
}
}
else if (pipe.AreThreadsWaitingToRead() && pipe.CanRead())
{
#if PIPES_TRACE
BasicConsole.WriteLine("ProcessPipeQueue: Pipe can read");
#endif
/* - Dequeue thread to read
* - Find thread to read
* - Load pointer to request structure from thread's stack
* - Read pipe
* - Setup return values for thread
* - Wake thread
* - Loop back
*/
#if PIPES_TRACE
BasicConsole.WriteLine("ProcessPipeQueue: Dequeuing in thread id");
#endif
UInt32 ThreadId;
if (!pipe.DequeueToRead(out ThreadId))
{
break;
}
#if PIPES_TRACE
BasicConsole.WriteLine("ProcessPipeQueue: Getting in thread");
#endif
Thread ReadThread = ProcessManager.GetThreadById(ThreadId, InProcess);
if (ReadThread == null)
{
break;
}
#if PIPES_TRACE
BasicConsole.WriteLine("ProcessPipeQueue: Reading pipe");
#endif
ReadPipeRequest* Request = (ReadPipeRequest*)ReadThread.Param1;
int BytesRead;
bool Successful = pipe.Read(Request->OutBuffer, Request->Offset, Request->Length, out BytesRead);
if (Successful)
{
#if PIPES_TRACE
BasicConsole.WriteLine("ProcessPipeQueue: Read successful");
#endif
ReadThread.Return1 = (uint)SystemCallResults.OK;
ReadThread.Return2 = (uint)BytesRead;
ReadThread._Wake();
}
else
{
#if PIPES_TRACE
BasicConsole.WriteLine("ProcessPipeQueue: Read failed");
#endif
ReadThread.Return1 = (uint)SystemCallResults.Fail;
ReadThread._Wake();
}
}
#if PIPES_TRACE
BasicConsole.WriteLine("ProcessPipeQueue: Looping...");
#endif
}
}
public static void RegisterProcess(Process process, Scheduler.Priority priority)
{
#if PROCESSMANAGER_TRACE
BasicConsole.WriteLine("Registering process...");
BasicConsole.WriteLine("Disabling scheduler...");
#endif
if (process == null)
{
ExceptionMethods.Throw(new FOS_System.Exception("Attempted to register null process!"));
}
//bool reenable = Scheduler.Enabled;
//if (reenable)
//{
// Scheduler.Disable();
//}
#if PROCESSMANAGER_TRACE
BasicConsole.WriteLine("Initialising process...");
#endif
Scheduler.InitProcess(process, priority);
#if PROCESSMANAGER_TRACE
BasicConsole.WriteLine("Adding process...");
#endif
Processes.Add(process);
#if PROCESSMANAGER_TRACE
BasicConsole.WriteLine("Enabling scheduler...");
#endif
//if (reenable)
//{
// Scheduler.Enable();
//}
}
public static void InitThread(Process process, Thread t)
{
t.TimeToRunReload = (int)process.Priority;
t.TimeToRun = t.TimeToRunReload;
UpdateList(t, false);
}
public static MemoryLayout EnableAccessToMemoryOfProcess(Process ProcessToAccess)
{
MemoryLayout OriginalMemoryLayout = ProcessManager.CurrentProcess.TheMemoryLayout;
MemoryLayout NewMemoryLayout = ProcessManager.CurrentProcess.TheMemoryLayout.Merge(ProcessToAccess.TheMemoryLayout);
ProcessManager.CurrentProcess.TheMemoryLayout = NewMemoryLayout;
NewMemoryLayout.Load(ProcessManager.CurrentProcess.UserMode);
return OriginalMemoryLayout;
}
//private static int LockupCounter = 0;
public static void InitProcess(Process process, Priority priority)
{
process.Priority = priority;
for (int i = 0; i < process.Threads.Count; i++)
{
Thread t = (Thread)process.Threads[i];
InitThread(process, t);
}
process.Registered = true;
}
public static Thread GetThreadById(uint threadId, Process parent)
{
for (int i = 0; i < parent.Threads.Count; i++)
{
if (((Thread)parent.Threads[i]).Id == threadId)
{
return (Thread)parent.Threads[i];
}
}
return null;
}
public static unsafe SystemCallResults HandleDeferredSystemCall(
Process CallerProcess, Thread CallerThread,
SystemCallNumbers syscallNumber, uint Param1, uint Param2, uint Param3,
ref uint Return2, ref uint Return3, ref uint Return4)
{
SystemCallResults result = SystemCallResults.Unhandled;
switch (syscallNumber)
{
case SystemCallNumbers.StartThread:
//BasicConsole.WriteLine("DSC: Start Thread");
Return2 = CallerProcess.CreateThread((ThreadStartMethod)Utilities.ObjectUtilities.GetObject((void*)Param1), "[From sys call]").Id;
//BasicConsole.WriteLine("DSC: Start Thread - done.");
result = SystemCallResults.OK;
break;
case SystemCallNumbers.RegisterPipeOutpoint:
{
//BasicConsole.WriteLine("DSC: Register Pipe Outpoint");
Pipes.PipeOutpoint outpoint;
bool registered = Pipes.PipeManager.RegisterPipeOutpoint(CallerProcess.Id, (Pipes.PipeClasses)Param1, (Pipes.PipeSubclasses)Param2, (int)Param3, out outpoint);
if (registered)
{
result = SystemCallResults.OK;
}
else
{
result = SystemCallResults.Fail;
}
//BasicConsole.WriteLine("DSC: Register Pipe Outpoint - done.");
}
break;
case SystemCallNumbers.GetNumPipeOutpoints:
{
//BasicConsole.WriteLine("DSC: Get Num Pipe Outpoints");
int numOutpoints;
bool obtained = Pipes.PipeManager.GetNumPipeOutpoints((Pipes.PipeClasses)Param1, (Pipes.PipeSubclasses)Param2, out numOutpoints);
if (obtained)
{
result = SystemCallResults.OK;
Return2 = (uint)numOutpoints;
}
else
{
result = SystemCallResults.Fail;
}
//BasicConsole.WriteLine("DSC: Get Num Pipe Outpoints - done");
}
break;
case SystemCallNumbers.GetPipeOutpoints:
{
//BasicConsole.WriteLine("DSC: Get Pipe Outpoints");
bool obtained = Pipes.PipeManager.GetPipeOutpoints(CallerProcess, (Pipes.PipeClasses)Param1, (Pipes.PipeSubclasses)Param2, (Pipes.PipeOutpointsRequest*)Param3);
if (obtained)
{
result = SystemCallResults.OK;
}
else
{
result = SystemCallResults.Fail;
}
//BasicConsole.WriteLine("DSC: Get Pipe Outpoints - done");
}
break;
case SystemCallNumbers.CreatePipe:
{
//BasicConsole.WriteLine("DSC: Create Pipe");
bool created = Pipes.PipeManager.CreatePipe(CallerProcess.Id, Param1, (Pipes.CreatePipeRequest*)Param2);
if (created)
{
result = SystemCallResults.OK;
}
else
{
result = SystemCallResults.Fail;
}
//BasicConsole.WriteLine("DSC: Create Pipe - done");
}
break;
case SystemCallNumbers.WaitOnPipeCreate:
{
//BasicConsole.WriteLine("DSC: Wait On Pipe Create");
bool waiting = Pipes.PipeManager.WaitOnPipeCreate(CallerProcess.Id, CallerThread.Id, (Pipes.PipeClasses)Param1, (Pipes.PipeSubclasses)Param2);
if (waiting)
{
result = SystemCallResults.Deferred;
}
else
{
result = SystemCallResults.Fail;
}
//BasicConsole.WriteLine("DSC: Wait On Pipe Create - done");
}
break;
case SystemCallNumbers.ReadPipe:
{
//BasicConsole.WriteLine("DSC: Read Pipe");
// Need access to calling process' memory to be able to set values in request structure(s)
MemoryLayout OriginalMemoryLayout = SystemCallsHelpers.EnableAccessToMemoryOfProcess(CallerProcess);
Pipes.ReadPipeRequest* RequestPtr = (Pipes.ReadPipeRequest*)Param1;
Pipes.PipeManager.RWResults RWResult = Pipes.PipeManager.ReadPipe(RequestPtr->PipeId, RequestPtr->Blocking, CallerProcess, CallerThread);
if (RWResult == Pipes.PipeManager.RWResults.Error)
{
result = SystemCallResults.Fail;
}
else
{
// Returning Deferred state from here will leave the caller thread
// in whatever state ReadPipe decided it should be in.
result = SystemCallResults.Deferred;
}
SystemCallsHelpers.DisableAccessToMemoryOfProcess(OriginalMemoryLayout);
//BasicConsole.WriteLine("DSC: Read Pipe - done");
}
break;
case SystemCallNumbers.WritePipe:
{
//BasicConsole.WriteLine("DSC: Write Pipe");
// Need access to calling process' memory to be able to set values in request structure(s)
MemoryLayout OriginalMemoryLayout = SystemCallsHelpers.EnableAccessToMemoryOfProcess(CallerProcess);
Pipes.WritePipeRequest* RequestPtr = (Pipes.WritePipeRequest*)Param1;
Pipes.PipeManager.RWResults RWResult = Pipes.PipeManager.WritePipe(RequestPtr->PipeId, RequestPtr->Blocking, CallerProcess, CallerThread);
if (RWResult == Pipes.PipeManager.RWResults.Error)
{
result = SystemCallResults.Fail;
}
else
{
// Returning Deferred state from here will leave the caller thread
// in whatever state WritePipe decided it should be in.
result = SystemCallResults.Deferred;
}
SystemCallsHelpers.DisableAccessToMemoryOfProcess(OriginalMemoryLayout);
//BasicConsole.WriteLine("DSC: Write Pipe - done");
}
break;
default:
BasicConsole.WriteLine("DSC: Unrecognised call number.");
BasicConsole.WriteLine((uint)syscallNumber);
break;
}
return result;
}
/// <remarks>
/// Specifying threadId=-1 accepts any thread from the specified process.
/// No guarantees are made about the thread chosen. This is used when you
/// mainly want to switch process context and don't care about the specific
/// thread context e.g. during an interrupt.
/// </remarks>
public static void SwitchProcess(uint processId, int threadId)
{
//Switch the current memory layout across.
// Don't touch register state etc, just the memory layout
bool dontSwitchOutIn = false;
if (CurrentProcess != null &&
CurrentProcess.Id == processId)
{
if (CurrentThread != null &&
(CurrentThread.Id == threadId || threadId == -1))
{
#if PROCESSMANAGER_SWITCH_TRACE
BasicConsole.WriteLine("No switch. (1)");
#endif
return;
}
else
{
#if PROCESSMANAGER_SWITCH_TRACE
BasicConsole.WriteLine("No switch. (2)");
#endif
dontSwitchOutIn = true;
}
}
if (!dontSwitchOutIn)
{
#if PROCESSMANAGER_SWITCH_TRACE
BasicConsole.WriteLine("Switching out: " + CurrentProcess.Name);
#endif
CurrentProcess.UnloadMemLayout();
CurrentProcess = null;
for (int i = 0; i < Processes.Count; i++)
{
if (((Process)Processes[i]).Id == processId)
{
CurrentProcess = ((Process)Processes[i]);
break;
}
}
// Process not found
if (CurrentProcess == null)
{
#if PROCESSMANAGER_SWITCH_TRACE
BasicConsole.WriteLine("Process not found.");
#endif
return;
}
#if PROCESSMANAGER_SWITCH_TRACE
BasicConsole.WriteLine("Process found. " + CurrentProcess.Name);
#endif
}
CurrentThread = null;
CurrentThread_State = null;
if (threadId == -1)
{
if (CurrentProcess.Threads.Count > 0)
{
CurrentThread = (Thread)CurrentProcess.Threads[0];
}
}
else
{
for (int i = 0; i < CurrentProcess.Threads.Count; i++)
{
if (((Thread)CurrentProcess.Threads[i]).Id == threadId)
{
CurrentThread = (Thread)CurrentProcess.Threads[i];
break;
}
}
}
// No threads in the process (?!) or process not found
if (CurrentThread == null)
{
#if PROCESSMANAGER_SWITCH_TRACE
BasicConsole.WriteLine("Thread not found.");
#endif
return;
}
#if PROCESSMANAGER_SWITCH_TRACE
BasicConsole.WriteLine("Thread found.");
#endif
CurrentThread_State = CurrentThread.State;
#if PROCESSMANAGER_SWITCH_TRACE
BasicConsole.WriteLine("Thread state updated.");
#endif
if (!dontSwitchOutIn)
{
#if PROCESSMANAGER_SWITCH_TRACE
BasicConsole.WriteLine("Switching in: " + CurrentProcess.Name);
#endif
CurrentProcess.LoadMemLayout();
}
}
public static bool Semaphore_AddOwner(int semaphoreId, uint processId, Process aProcess)
{
if (Semaphore_VerifyOwner(semaphoreId, aProcess))
{
((Semaphore)Semaphores[semaphoreId]).OwnerProcesses.Add(processId);
return true;
}
return false;
}
public Thread(Process AnOwner, ThreadStartMethod StartMethod, uint AnId, bool UserMode, FOS_System.String AName)
{
#if THREAD_TRACE
BasicConsole.WriteLine("Constructing thread object...");
#endif
LastActiveState = ActiveStates.NotStarted;
Owner = AnOwner;
//Init thread state
#if THREAD_TRACE
BasicConsole.WriteLine("Allocating state memory...");
#endif
State = (ThreadState*)FOS_System.Heap.Alloc((uint)sizeof(ThreadState), "Thread : Thread() (1)");
// Init Id and EIP
// Set EIP to the first instruction of the main method
#if THREAD_TRACE
BasicConsole.WriteLine("Setting thread info...");
#endif
Id = AnId;
Name = AName;
State->StartEIP = (uint)Utilities.ObjectUtilities.GetHandle(StartMethod);
// Allocate kernel memory for the kernel stack for this thread
// Used when this thread is preempted or does a sys call. Stack is switched to
// this thread-specific kernel stack
#if THREAD_TRACE
BasicConsole.WriteLine("Allocating kernel stack...");
#endif
// TODO: Allocate using virt mem manager not the heap (see ThreadStackTop below)
State->KernelStackTop = (byte*)FOS_System.Heap.Alloc(0x1000, 4) + 0xFFC; //4KiB, 4-byte aligned
// Allocate free memory for the user stack for this thread
// Used by this thread in normal execution
#if THREAD_TRACE
BasicConsole.WriteLine("Mapping thread stack page...");
#endif
State->UserMode = UserMode;
State->ThreadStackTop = (byte*)Hardware.VirtMemManager.MapFreePage(
UserMode ? Hardware.VirtMem.VirtMemImpl.PageFlags.None :
Hardware.VirtMem.VirtMemImpl.PageFlags.KernelOnly) + 4092; //4 KiB, page-aligned
// Set ESP to the top of the stack - 4 byte aligned, high address since x86 stack works
// downwards
#if THREAD_TRACE
BasicConsole.WriteLine("Setting ESP...");
#endif
State->ESP = (uint)State->ThreadStackTop;
// TimeToRun and TimeToRunReload are set up in Scheduler.InitProcess which
// is called when a process is registered.
// Init SS
// Stack Segment = User or Kernel space data segment selector offset
// Kernel data segment selector offset (offset in GDT) = 0x10 (16)
// User data segment selector offset (offset in GDT) = 0x23 (32|3)
// User data segment selector must also be or'ed with 3 for User Privilege level
#if THREAD_TRACE
BasicConsole.WriteLine("Setting SS...");
#endif
State->SS = UserMode ? (ushort)0x23 : (ushort)0x10;
// Init Started
// Not started yet so set to false
#if THREAD_TRACE
BasicConsole.WriteLine("Setting started...");
#endif
State->Started = false;
#if THREAD_TRACE
BasicConsole.WriteLine("Allocating exception state...");
#endif
//TODO: This is currently incorrectly allocated from the current process's heap instead of the heap of the owner process
// Init Exception State
State->ExState = (ExceptionState*)FOS_System.Heap.AllocZeroed((uint)sizeof(ExceptionState), "Thread : Thread() (2)");
#if THREAD_TRACE
BasicConsole.WriteLine("Done.");
#endif
}
public static int Semaphore_Allocate(int limit, Process aProcess)
{
int result = -1;
Semaphore theSemaphore = null;
SemaphoresLock.Enter();
for (int i = 0; i < Semaphores.Count; i++)
{
Semaphore aSemaphore = (Semaphore)Semaphores[i];
if (aSemaphore == null)
{
Semaphores[i] = theSemaphore = new Semaphore(i, limit);
result = i;
break;
}
}
if (result == -1)
{
result = Semaphores.Count;
Semaphores.Add(theSemaphore = new Semaphore(result, limit));
}
SemaphoresLock.Exit();
theSemaphore.OwnerProcesses.Add(aProcess.Id);
return result;
}
public static int Semaphore_Wait(int id, Process aProcess, Thread aThread)
{
if (Semaphore_VerifyOwner(id, aProcess))
{
return ((Semaphore)Semaphores[id]).WaitOnBehalf(aProcess, aThread) ? 1 : 0;
}
return -1;
}
public static void SwitchProcess(uint processId, int threadId)
{
//Switch the current memory layout across.
// Don't touch register state etc, just the memory layout
bool dontSwitchOutIn = false;
if (CurrentProcess != null &&
CurrentProcess.Id == processId)
{
if (CurrentThread != null &&
(CurrentThread.Id == threadId || threadId == THREAD_DONT_CARE))
{
#if PROCESSMANAGER_SWITCH_TRACE
BasicConsole.WriteLine("No switch. (1)");
#endif
return;
}
else
{
#if PROCESSMANAGER_SWITCH_TRACE
BasicConsole.WriteLine("No switch. (2)");
#endif
dontSwitchOutIn = true;
}
}
if (!dontSwitchOutIn)
{
#if PROCESSMANAGER_SWITCH_TRACE
BasicConsole.Write("Switching out: ");
BasicConsole.WriteLine(CurrentProcess.Name);
#endif
CurrentProcess.UnloadHeap();
CurrentProcess.UnloadMemLayout();
CurrentProcess = GetProcessById(processId);
// Process not found
if (CurrentProcess == null)
{
#if PROCESSMANAGER_SWITCH_TRACE
BasicConsole.WriteLine("Process not found.");
#endif
return;
}
#if PROCESSMANAGER_SWITCH_TRACE
BasicConsole.Write("Switching in: ");
BasicConsole.WriteLine(CurrentProcess.Name);
#endif
CurrentProcess.LoadMemLayout();
CurrentProcess.LoadHeap();
}
CurrentThread = null;
CurrentThread_State = null;
if (threadId == THREAD_DONT_CARE)
{
if (CurrentProcess.Threads.Count > 0)
{
CurrentThread = (Thread)CurrentProcess.Threads[0];
}
}
else
{
CurrentThread = GetThreadById((uint)threadId, CurrentProcess);
}
// No threads in the process (?!) or process not found
if (CurrentThread == null)
{
#if PROCESSMANAGER_SWITCH_TRACE
BasicConsole.WriteLine("Thread not found.");
#endif
return;
}
#if PROCESSMANAGER_SWITCH_TRACE
BasicConsole.WriteLine("Thread found.");
#endif
CurrentThread_State = CurrentThread.State;
#if PROCESSMANAGER_SWITCH_TRACE
BasicConsole.WriteLine("Thread state updated.");
#endif
}
/// <summary>
/// Attempts to write to the specified pipe.
/// </summary>
/// <remarks>
/// Note that this function is non-blocking. It will, however, block a system caller thread by simply not returning it from
/// the deferred system call.
/// </remarks>
/// <param name="PipeId">The Id of the pipe to write.</param>
/// <param name="Blocking">Whether the write should be blocking or non-blocking.</param>
/// <param name="CallerProcess">The process which made the call.</param>
/// <param name="CallerThread">The thread which made the call.</param>
/// <returns>See descriptions on <see cref="PipeManager.RWResults"/> values.</returns>
public static RWResults WritePipe(int PipeId, bool Blocking, Process CallerProcess, Thread CallerThread)
{
#if PIPES_TRACE
BasicConsole.WriteLine("WritePipe: Validating inputs");
#endif
// Validate inputs
// - Check pipe exists
Pipe pipe = GetPipe(PipeId);
if (pipe == null)
{
return RWResults.Error;
}
#if PIPES_TRACE
BasicConsole.WriteLine("WritePipe: Checking caller allowed to write");
#endif
// Check the caller is allowed to access the pipe
if (!AllowedToWritePipe(pipe, CallerProcess.Id))
{
return RWResults.Error;
}
#if PIPES_TRACE
BasicConsole.WriteLine("WritePipe: Getting out process");
#endif
// Get outpoint process
Process OutProcess = ProcessManager.GetProcessById(pipe.Outpoint.ProcessId);
if (OutProcess == null)
{
return RWResults.Error;
}
#if PIPES_TRACE
BasicConsole.WriteLine("WritePipe: Getting in process");
#endif
// Get inpoint process
Process InProcess = ProcessManager.GetProcessById(pipe.Inpoint.ProcessId);
if (InProcess == null)
{
return RWResults.Error;
}
#if PIPES_TRACE
BasicConsole.WriteLine("WritePipe: Merging memory layouts");
#endif
// Merge memory layouts of in process (out process should already have been done by caller)
// so we can access the request structure(s) and buffers
MemoryLayout OriginalMemoryLayout = SystemCallsHelpers.EnableAccessToMemoryOfProcess(InProcess);
#if PIPES_TRACE
BasicConsole.WriteLine("WritePipe: Adding caller to write queue");
#endif
// Add caller thread to the write queue
WritePipeRequest* Request = (WritePipeRequest*)CallerThread.Param1;
pipe.QueueToWrite(CallerThread.Id, Request->Length);
// Set up initial failure return value
CallerThread.Return1 = (uint)SystemCallResults.Fail;
#if PIPES_TRACE
BasicConsole.WriteLine("WritePipe: Processing pipe queue");
#endif
// Process the pipe queue
ProcessPipeQueue(pipe, OutProcess, InProcess);
#if PIPES_TRACE
BasicConsole.WriteLine("WritePipe: Unmerging memory layouts");
#endif
// Unmerge memory layouts
SystemCallsHelpers.DisableAccessToMemoryOfProcess(OriginalMemoryLayout);
bool Completed = !pipe.AreThreadsWaitingToWrite();
if (!Blocking)
{
if (!Completed)
{
uint temp;
bool removed = pipe.RemoveLastToWrite(out temp);
if (!removed || temp != CallerThread.Id)
{
BasicConsole.WriteLine("PipeManager: Error! Async write failed and then removing last from queue resulted in thread Id mismatch!");
}
CallerThread.Return1 = (uint)SystemCallResults.Fail;
CallerThread._Wake();
}
}
return Completed ? RWResults.Complete : RWResults.Queued;
}
/// <summary>
/// Attempts to get descriptors of the outpoints of the specified class and subclass.
/// </summary>
/// <param name="CallerProcess">The process which owns the memory containing the <paramref cref="request"/>.</param>
/// <param name="Class">The class of outpoint to search for.</param>
/// <param name="Subclass">The subclass of outpoint to search for.</param>
/// <param name="request">A pointer to the request structure (Also used to store the result(s)).</param>
/// <returns>True if the request was successful. Otherwise, false.</returns>
public static bool GetPipeOutpoints(Process CallerProcess, PipeClasses Class, PipeSubclasses Subclass, PipeOutpointsRequest* request)
{
// Validate inputs & get caller process
if (CallerProcess == null)
{
return false;
}
// Merge memory layouts
// so we can access the request structure
MemoryLayout OriginalMemoryLayout = SystemCallsHelpers.EnableAccessToMemoryOfProcess(CallerProcess);
bool OK = true;
// More validate inputs
// - Check request exists (should've been pre-allocated by caller)
// - Check request->Outpoints exists (should've been pre-allocated by caller)
// - Check request->MaxDescriptors was set correctly
if (request == null)
{
// Should have been pre-allocated by the calling thread (/process)
OK = false;
}
else if (request->Outpoints == null)
{
// Should have been pre-allocated by the calling thread (/process)
OK = false;
}
else if (request->MaxDescriptors == 0)
{
// Not technically an error but let's not waste time processing 0 descriptors
OK = true;
}
if (OK)
{
// Search for all outpoints of correct class and subclass
int maxDescriptors = request->MaxDescriptors;
for (int i = 0, j = 0; i < PipeOutpoints.Count && j < maxDescriptors; i++)
{
PipeOutpoint anOutpoint = (PipeOutpoint)PipeOutpoints[i];
if (anOutpoint.Class == Class &&
anOutpoint.Subclass == Subclass &&
( anOutpoint.MaxConnections == PipeConstants.UnlimitedConnections ||
anOutpoint.NumConnections < anOutpoint.MaxConnections))
{
// Set the resultant values
request->Outpoints[j++].ProcessId = anOutpoint.ProcessId;
}
}
}
SystemCallsHelpers.DisableAccessToMemoryOfProcess(OriginalMemoryLayout);
return OK;
}
public static void DisableKernelAccessToProcessMemory(Process TargetProcess)
{
if (KernelProcess != null && KernelProcess != TargetProcess)
{
#if PROCESSMANAGER_KERNEL_ACCESS_TRACE
BasicConsole.WriteLine("~D~");
#endif
KernelProcess.TheMemoryLayout.Unmerge(TargetProcess.TheMemoryLayout);
TargetProcess.TheMemoryLayout.Unload();
}
}
public static void EnableKernelAccessToProcessMemory(Process TargetProcess)
{
if (KernelProcess != null && KernelProcess != TargetProcess)
{
#if PROCESSMANAGER_KERNEL_ACCESS_TRACE
BasicConsole.WriteLine("~E~");
#endif
KernelProcess.TheMemoryLayout.Merge(TargetProcess.TheMemoryLayout);
KernelProcess.TheMemoryLayout.Load(KernelProcess.UserMode);
}
}
public static bool WakeThread(Process theProcess, uint threadId)
{
bool Woken = false;
if (theProcess != null)
{
Thread theThread = GetThreadById(threadId, theProcess);
if (theThread != null)
{
theThread._Wake();
Woken = true;
}
}
return Woken;
}
public static void InitProcess(Process process, Priority priority)
{
process.Priority = priority;
}
public static bool Semaphore_Deallocate(int id, Process aProcess)
{
if (Semaphore_VerifyOwner(id, aProcess))
{
SemaphoresLock.Enter();
Semaphores[id] = null;
SemaphoresLock.Exit();
return true;
}
return false;
}
public static void EndDeferredSystemCall(Process CallerProcess, Thread CallerThread, SystemCallResults result, uint Return2, uint Return3, uint Return4)
{
ProcessManager.EnableKernelAccessToProcessMemory(CallerProcess);
CallerThread.Return1 = (uint)result;
CallerThread.Return2 = Return2;
CallerThread.Return3 = Return3;
CallerThread.Return4 = Return4;
ProcessManager.DisableKernelAccessToProcessMemory(CallerProcess);
CallerThread._Wake();
}
public static bool Semaphore_Signal(int id, Process aProcess)
{
if (Semaphore_VerifyOwner(id, aProcess))
{
((Semaphore)Semaphores[id]).SignalOnBehalf();
return true;
}
return false;
}
public void Load(bool UserMode)
{
bool OK = true;
try
{
bool DynamicLinkingRequired = false;
ThreadStartMethod mainMethod = (ThreadStartMethod)Utilities.ObjectUtilities.GetObject(theFile.Header.EntryPoint);
theProcess = ProcessManager.CreateProcess(
mainMethod, theFile.TheFile.Name, UserMode);
uint threadStackVirtAddr = (uint)((Thread)theProcess.Threads[0]).State->ThreadStackTop - 4092;
uint threadStackPhysAddr = (uint)Hardware.VirtMemManager.GetPhysicalAddress(threadStackVirtAddr);
ProcessManager.CurrentProcess.TheMemoryLayout.AddDataPage(threadStackPhysAddr, threadStackVirtAddr);
// Load the ELF segments (i.e. the program code and data)
BaseAddress = theFile.BaseAddress;
LoadSegments(theFile, ref OK, ref DynamicLinkingRequired, BaseAddress);
//BasicConsole.WriteLine();
#region Relocations
// Useful articles / specifications on Relocations:
// - Useful / practical explanation of various relocation types: http://eli.thegreenplace.net/2011/08/25/load-time-relocation-of-shared-libraries/#id20
// - Orcale : ELF Specification copy: http://docs.oracle.com/cd/E23824_01/html/819-0690/chapter6-54839.html
if (DynamicLinkingRequired)
{
Console.Default.WriteLine("Dynamic Linking");
BasicConsole.WriteLine("Dynamic Linking");
ELFDynamicSection dynamicSection = theFile.DynamicSection;
ELFDynamicSymbolTableSection dynamicSymbolsSection = theFile.DynamicSymbolsSection;
ELFStringTable DynamicsStringTable = new ELFStringTable(
dynamicSection.StrTabDynamic.Val_Ptr, dynamicSection.StrTabSizeDynamic.Val_Ptr);
for (uint i = 0; i < dynamicSection.Dynamics.Count; i++)
{
ELFDynamicSection.Dynamic theDyn = dynamicSection[i];
//BasicConsole.WriteLine(" - Dynamic : ");
//BasicConsole.Write(" - Tag : ");
//BasicConsole.WriteLine((int)theDyn.Tag);
//BasicConsole.Write(" - Value or Pointer : ");
//BasicConsole.WriteLine(theDyn.Val_Ptr);
if (theDyn.Tag == ELFDynamicSection.DynamicTag.Needed)
{
BasicConsole.Write(" - Needed library name : ");
FOS_System.String libFullPath = DynamicsStringTable[theDyn.Val_Ptr];
Console.Default.WriteLine(libFullPath);
BasicConsole.WriteLine(libFullPath);
FOS_System.String libFileName = (FOS_System.String)libFullPath.Split('\\').Last();
libFileName = (FOS_System.String)libFileName.Split('/').Last();
FOS_System.String libTestPath = theFile.TheFile.Parent.GetFullPath() + libFileName;
File sharedObjectFile = File.Open(libTestPath);
if (sharedObjectFile == null)
{
Console.Default.WarningColour();
Console.Default.WriteLine("Failed to find needed library file!");
BasicConsole.WriteLine("Failed to find needed library file!");
Console.Default.DefaultColour();
OK = false;
}
else
{
Console.Default.WriteLine("Found library file. Loading library...");
BasicConsole.WriteLine("Found library file. Loading library...");
ELFSharedObject sharedObject = DynamicLinkerLoader.LoadLibrary_FromELFSO(sharedObjectFile, this);
SharedObjectDependencies.Add(sharedObject);
Console.Default.WriteLine("Library loaded.");
BasicConsole.WriteLine("Library loaded.");
}
}
}
Console.Default.WriteLine("Library Relocations");
BasicConsole.WriteLine("Library Relocations");
// Perform relocation / dynamic linking of all libraries
for (int i = 0; i < SharedObjectDependencies.Count; i++)
{
ELFSharedObject SO = (ELFSharedObject)SharedObjectDependencies[i];
//BasicConsole.WriteLine("Shared Object base address : " + (FOS_System.String)SO.BaseAddress);
//BasicConsole.WriteLine("Shared Object file base address : " + (FOS_System.String)SO.TheFile.BaseAddress);
List SOSections = SO.TheFile.Sections;
for (int j = 0; j < SOSections.Count; j++)
{
ELFSection SOSection = (ELFSection)SOSections[j];
if (SOSection is ELFRelocationTableSection)
{
//BasicConsole.WriteLine(" - Normal Relocation");
ELFRelocationTableSection relocTableSection = (ELFRelocationTableSection)SOSection;
ELFSymbolTableSection symbolTable = (ELFSymbolTableSection)SO.TheFile.Sections[relocTableSection.SymbolTableSectionIndex];
ELFStringTableSection symbolNamesTable = (ELFStringTableSection)SO.TheFile.Sections[symbolTable.StringsSectionIndex];
List Relocations = relocTableSection.Relocations;
for (int k = 0; k < Relocations.Count; k++)
{
// Reference: http://docs.oracle.com/cd/E19683-01/817-3677/chapter6-26/index.html
ELFRelocationTableSection.Relocation relocation = (ELFRelocationTableSection.Relocation)Relocations[k];
if (relocation.Type == ELFRelocationTableSection.RelocationType.R_386_NONE)
{
continue;
}
uint* resolvedRelLocation = (uint*)(SO.BaseAddress + (relocation.Offset - SO.TheFile.BaseAddress));
ELFSymbolTableSection.Symbol symbol = (ELFSymbolTableSection.Symbol)symbolTable[relocation.Symbol];
FOS_System.String symbolName = symbolNamesTable[symbol.NameIdx];
//BasicConsole.WriteLine("Relocation:");
////BasicConsole.WriteLine(" > Symbol index : " + (FOS_System.String)relocation.Symbol);
//BasicConsole.WriteLine(" > Type : " + (FOS_System.String)(uint)relocation.Type);
//BasicConsole.WriteLine(" > Offset : " + (FOS_System.String)(uint)relocation.Offset);
//BasicConsole.WriteLine(((FOS_System.String)" > Resolved location address: ") + (uint)resolvedRelLocation);
////BasicConsole.WriteLine(((FOS_System.String)" > Resolved location start value: ") + *resolvedRelLocation);
//BasicConsole.Write(" > Symbol name : ");
//BasicConsole.WriteLine(symbolName);
uint newValue = 0;
switch (relocation.Type)
{
case ELFRelocationTableSection.RelocationType.R_386_32:
newValue = GetSymbolAddress(symbol, symbolName) + *resolvedRelLocation;
break;
case ELFRelocationTableSection.RelocationType.R_386_PC32:
newValue = GetSymbolAddress(symbol, symbolName) + *resolvedRelLocation - (uint)resolvedRelLocation;
break;
case ELFRelocationTableSection.RelocationType.R_386_RELATIVE:
newValue = SO.BaseAddress + *resolvedRelLocation;
break;
//TODO: Support more relocation types
default:
Console.Default.WarningColour();
Console.Default.Write("WARNING: Unrecognised relocation type! (");
Console.Default.Write_AsDecimal((uint)relocation.Type);
Console.Default.WriteLine(")");
Console.Default.DefaultColour();
BasicConsole.Write("WARNING: Unrecognised relocation type! (");
BasicConsole.Write((uint)relocation.Type);
BasicConsole.WriteLine(")");
break;
}
*resolvedRelLocation = newValue;
//BasicConsole.WriteLine(" > New value: " + (FOS_System.String)(newValue));
//BasicConsole.WriteLine(" > Resolved location end value: " + (FOS_System.String)(*resolvedRelLocation));
}
}
else if (SOSection is ELFRelocationAddendTableSection)
{
//BasicConsole.WriteLine(" - Addend Relocation");
ELFRelocationAddendTableSection relocTableSection = (ELFRelocationAddendTableSection)SOSection;
ELFSymbolTableSection symbolTable = (ELFSymbolTableSection)SO.TheFile.Sections[relocTableSection.SymbolTableSectionIndex];
ELFStringTableSection symbolNamesTable = (ELFStringTableSection)SO.TheFile.Sections[symbolTable.StringsSectionIndex];
List Relocations = relocTableSection.Relocations;
for (int k = 0; k < Relocations.Count; k++)
{
ELFRelocationAddendTableSection.RelocationAddend relocation = (ELFRelocationAddendTableSection.RelocationAddend)Relocations[k];
if (relocation.Type == ELFRelocationTableSection.RelocationType.R_386_NONE)
{
continue;
}
ELFSymbolTableSection.Symbol symbol = (ELFSymbolTableSection.Symbol)symbolTable[relocation.Symbol];
FOS_System.String symbolName = symbolNamesTable[symbol.NameIdx];
uint* resolvedRelLocation = (uint*)(SO.BaseAddress + (relocation.Offset - SO.TheFile.BaseAddress));
//BasicConsole.WriteLine("Relocation:");
////BasicConsole.WriteLine(" > Symbol index : " + (FOS_System.String)relocation.Symbol);
//BasicConsole.WriteLine(" > Type : " + (FOS_System.String)(uint)relocation.Type);
//BasicConsole.WriteLine(" > Offset : " + (FOS_System.String)(uint)relocation.Offset);
//BasicConsole.WriteLine(((FOS_System.String)" > Resolved location address: ") + (uint)resolvedRelLocation);
////BasicConsole.WriteLine(((FOS_System.String)" > Resolved location start value: ") + *resolvedRelLocation);
//BasicConsole.Write(" > Symbol name : ");
//BasicConsole.WriteLine(symbolName);
uint newValue = 0;
switch (relocation.Type)
{
//TODO: Support more relocation types
default:
Console.Default.WarningColour();
Console.Default.Write("WARNING: Unrecognised relocation type! (");
Console.Default.Write_AsDecimal((uint)relocation.Type);
Console.Default.WriteLine(")");
Console.Default.DefaultColour();
BasicConsole.Write("WARNING: Unrecognised relocation type! (");
BasicConsole.Write((uint)relocation.Type);
BasicConsole.WriteLine(")");
break;
}
*resolvedRelLocation = newValue;
//BasicConsole.WriteLine(" > New value: " + (FOS_System.String)(newValue));
//BasicConsole.WriteLine(" > Resolved location end value: " + (FOS_System.String)(*resolvedRelLocation));
}
}
}
}
Console.Default.WriteLine("Executable Relocations");
BasicConsole.WriteLine("Executable Relocations");
//BasicConsole.WriteLine("Executable base address : " + (FOS_System.String)BaseAddress);
//BasicConsole.WriteLine("Executable file base address : " + (FOS_System.String)theFile.BaseAddress);
// Perform dynamic linking of executable
List ExeSections = theFile.Sections;
for (int j = 0; j < ExeSections.Count; j++)
{
ELFSection ExeSection = (ELFSection)ExeSections[j];
if (ExeSection is ELFRelocationTableSection)
{
//BasicConsole.WriteLine(" - Normal Relocations");
ELFRelocationTableSection relocTableSection = (ELFRelocationTableSection)ExeSection;
ELFSymbolTableSection symbolTable = (ELFSymbolTableSection)theFile.Sections[relocTableSection.SymbolTableSectionIndex];
ELFStringTableSection symbolNamesTable = (ELFStringTableSection)theFile.Sections[symbolTable.StringsSectionIndex];
List Relocations = relocTableSection.Relocations;
for (int k = 0; k < Relocations.Count; k++)
{
ELFRelocationTableSection.Relocation relocation = (ELFRelocationTableSection.Relocation)Relocations[k];
if (relocation.Type == ELFRelocationTableSection.RelocationType.R_386_NONE)
{
continue;
}
uint* resolvedRelLocation = (uint*)(BaseAddress + (relocation.Offset - theFile.BaseAddress));
ELFSymbolTableSection.Symbol symbol = (ELFSymbolTableSection.Symbol)symbolTable[relocation.Symbol];
FOS_System.String symbolName = symbolNamesTable[symbol.NameIdx];
//BasicConsole.WriteLine("Relocation:");
////BasicConsole.WriteLine(" > Symbol index : " + (FOS_System.String)relocation.Symbol);
//BasicConsole.WriteLine(" > Type : " + (FOS_System.String)(uint)relocation.Type);
//BasicConsole.WriteLine(" > Offset : " + (FOS_System.String)(uint)relocation.Offset);
//BasicConsole.WriteLine(((FOS_System.String)" > Resolved location address: ") + (uint)resolvedRelLocation);
////BasicConsole.WriteLine(((FOS_System.String)" > Resolved location start value: ") + *resolvedRelLocation);
//BasicConsole.Write(" > Symbol name : ");
//BasicConsole.WriteLine(symbolName);
bool setFromNewValue = true;
uint newValue = 0;
switch (relocation.Type)
{
//TODO: Support more relocation types
case ELFRelocationTableSection.RelocationType.R_386_JMP_SLOT:
newValue = GetSymbolAddress(symbol, symbolName);
break;
case ELFRelocationTableSection.RelocationType.R_386_COPY:
// Created by the link-editor for dynamic executables to preserve a read-only text segment.
// Its offset member refers to a location in a writable segment. The symbol table index
// specifies a symbol that should exist both in the current object file and in a shared object.
// During execution, the runtime linker copies data associated with the shared object's symbol
// to the location specified by the offset.
// See Copy Relocations:
// http://docs.oracle.com/cd/E19683-01/817-3677/6mj8mbtbs/index.html#chapter4-84604
setFromNewValue = false;
uint symbolAddress = 0;
uint symbolSize = 0;
if (GetSymbolAddressAndSize(symbol, symbolName, ref symbolAddress, ref symbolSize))
{
byte* symbolValuePtr = (byte*)symbolAddress;
//BasicConsole.Write(" > Symbol size : ");
//BasicConsole.WriteLine(symbolSize);
for (int i = 0; i < symbolSize; i++)
{
resolvedRelLocation[i] = symbolValuePtr[i];
}
}
else
{
BasicConsole.WriteLine("Failed to get symbol address and size for R_386_COPY relocation!");
}
break;
default:
Console.Default.WarningColour();
Console.Default.Write("WARNING: Unrecognised relocation type! (");
Console.Default.Write_AsDecimal((uint)relocation.Type);
Console.Default.WriteLine(")");
Console.Default.DefaultColour();
BasicConsole.Write("WARNING: Unrecognised relocation type! (");
BasicConsole.Write((uint)relocation.Type);
BasicConsole.WriteLine(")");
break;
}
if (setFromNewValue)
{
*resolvedRelLocation = newValue;
//BasicConsole.WriteLine(" > New value: " + (FOS_System.String)(newValue));
//BasicConsole.WriteLine(" > Resolved location end value: " + (FOS_System.String)(*resolvedRelLocation));
}
}
}
else if (ExeSection is ELFRelocationAddendTableSection)
{
//BasicConsole.WriteLine(" - Addend Relocations");
ELFRelocationAddendTableSection relocTableSection = (ELFRelocationAddendTableSection)ExeSection;
ELFSymbolTableSection symbolTable = (ELFSymbolTableSection)theFile.Sections[relocTableSection.SymbolTableSectionIndex];
ELFStringTableSection symbolNamesTable = (ELFStringTableSection)theFile.Sections[symbolTable.StringsSectionIndex];
List Relocations = relocTableSection.Relocations;
for (int k = 0; k < Relocations.Count; k++)
{
ELFRelocationAddendTableSection.RelocationAddend relocation = (ELFRelocationAddendTableSection.RelocationAddend)Relocations[k];
if (relocation.Type == ELFRelocationTableSection.RelocationType.R_386_NONE)
{
continue;
}
uint* resolvedRelLocation = (uint*)(BaseAddress + (relocation.Offset - theFile.BaseAddress));
ELFSymbolTableSection.Symbol symbol = (ELFSymbolTableSection.Symbol)symbolTable[relocation.Symbol];
FOS_System.String symbolName = symbolNamesTable[symbol.NameIdx];
//BasicConsole.WriteLine("Relocation:");
////BasicConsole.WriteLine(" > Symbol index : " + (FOS_System.String)relocation.Symbol);
//BasicConsole.WriteLine(" > Type : " + (FOS_System.String)(uint)relocation.Type);
//BasicConsole.WriteLine(" > Offset : " + (FOS_System.String)(uint)relocation.Offset);
//BasicConsole.WriteLine(((FOS_System.String)" > Resolved location address: ") + (uint)resolvedRelLocation);
////BasicConsole.WriteLine(((FOS_System.String)" > Resolved location start value: ") + *resolvedRelLocation);
//BasicConsole.Write(" > Symbol name : ");
//BasicConsole.WriteLine(symbolName);
uint newValue = 0;
switch (relocation.Type)
{
//TODO: Support more relocation types
default:
Console.Default.WarningColour();
Console.Default.Write("WARNING: Unrecognised relocation type! (");
Console.Default.Write_AsDecimal((uint)relocation.Type);
Console.Default.WriteLine(")");
Console.Default.DefaultColour();
BasicConsole.Write("WARNING: Unrecognised relocation type! (");
BasicConsole.Write((uint)relocation.Type);
BasicConsole.WriteLine(")");
break;
}
*resolvedRelLocation = newValue;
//BasicConsole.WriteLine(" > New value: " + (FOS_System.String)(newValue));
//BasicConsole.WriteLine(" > Resolved location end value: " + (FOS_System.String)(*resolvedRelLocation));
}
}
}
// TODO: Call Init functions of libraries
}
// Unmap processes' memory from current processes' memory
for (int i = 0; i < SharedObjectDependencies.Count; i++)
{
ELFSharedObject SO = (ELFSharedObject)SharedObjectDependencies[i];
uint FileBaseAddress = SO.TheFile.BaseAddress;
uint MemBaseAddress = SO.BaseAddress;
List SOSegments = SO.TheFile.Segments;
for (int j = 0; j < SOSegments.Count; j++)
{
ELFSegment SOSegment = (ELFSegment)SOSegments[j];
ProcessManager.CurrentProcess.TheMemoryLayout.RemovePage(
(MemBaseAddress + ((uint)SOSegment.Header.VAddr - FileBaseAddress)) & 0xFFFFF000);
}
}
{
uint FileBaseAddress = theFile.BaseAddress;
uint MemBaseAddress = BaseAddress;
List ExeSegments = theFile.Segments;
for (int j = 0; j < ExeSegments.Count; j++)
{
ELFSegment ExeSegment = (ELFSegment)ExeSegments[j];
ProcessManager.CurrentProcess.TheMemoryLayout.RemovePage(
(MemBaseAddress + ((uint)ExeSegment.Header.VAddr - FileBaseAddress)) & 0xFFFFF000);
}
}
#endregion
ProcessManager.CurrentProcess.TheMemoryLayout.RemovePage(threadStackVirtAddr);
}
finally
{
if (!OK)
{
theProcess = null;
}
}
}
private static bool Semaphore_VerifyOwner(int id, Process aProcess)
{
if (id > -1 && id < Semaphores.Count && Semaphores[id] != null)
{
Semaphore theSemaphore = ((Semaphore)Semaphores[id]);
return theSemaphore.OwnerProcesses.IndexOf(aProcess.Id) > -1;
}
return false;
}
/// <summary>
/// Attempts to read from the specified pipe.
/// </summary>
/// <remarks>
/// Note that this function is non-blocking. It will, however, block a system caller thread by simply not returning it from
/// the deferred system call.
/// </remarks>
/// <param name="PipeId">The Id of the pipe to read.</param>
/// <param name="Blocking">Whether the read should be blocking or non-blocking.</param>
/// <param name="CallerProcess">The process which made the call.</param>
/// <param name="CallerThread">The thread which made the call.</param>
/// <returns>See descriptions on <see cref="PipeManager.RWResults"/> values.</returns>
public static RWResults ReadPipe(int PipeId, bool Blocking, Process CallerProcess, Thread CallerThread)
{
#if PIPES_TRACE
BasicConsole.WriteLine("ReadPipe: Validating inputs");
#endif
// Validate inputs
// - Check pipe exists
Pipe pipe = GetPipe(PipeId);
if (pipe == null)
{
return RWResults.Error;
}
#if PIPES_TRACE
BasicConsole.WriteLine("ReadPipe: Checking caller allowed to write");
#endif
// Check the caller is allowed to access the pipe
if (!AllowedToReadPipe(pipe, CallerProcess.Id))
{
return RWResults.Error;
}
#if PIPES_TRACE
BasicConsole.WriteLine("ReadPipe: Getting out process");
#endif
// Get outpoint process
Process OutProcess = ProcessManager.GetProcessById(pipe.Outpoint.ProcessId);
if (OutProcess == null)
{
return RWResults.Error;
}
#if PIPES_TRACE
BasicConsole.WriteLine("ReadPipe: Getting in process");
#endif
// Get inpoint process
Process InProcess = ProcessManager.GetProcessById(pipe.Inpoint.ProcessId);
if (InProcess == null)
{
return RWResults.Error;
}
#if PIPES_TRACE
BasicConsole.WriteLine("ReadPipe: Adding caller to read queue");
#endif
// Add caller thread to the read queue
pipe.QueueToRead(CallerThread.Id);
ProcessManager.EnableKernelAccessToProcessMemory(CallerProcess);
// Set up initial failure return value
CallerThread.Return1 = (uint)SystemCallResults.Fail;
ProcessManager.DisableKernelAccessToProcessMemory(CallerProcess);
#if PIPES_TRACE
BasicConsole.WriteLine("ReadPipe: Processing pipe queue");
#endif
// Process the pipe queue
ProcessPipeQueue(pipe, OutProcess, InProcess);
bool Completed = !pipe.AreThreadsWaitingToRead();
if (!Blocking)
{
if (!Completed)
{
uint temp;
bool removed = pipe.RemoveLastToRead(out temp);
if (!removed || temp != CallerThread.Id)
{
BasicConsole.WriteLine("PipeManager: Error! Async read failed and then removing last from queue resulted in thread Id mismatch!");
}
ProcessManager.EnableKernelAccessToProcessMemory(CallerProcess);
CallerThread.Return1 = (uint)SystemCallResults.Fail;
ProcessManager.DisableKernelAccessToProcessMemory(CallerProcess);
CallerThread._Wake();
}
}
return Completed ? RWResults.Complete : RWResults.Queued;
}
