feat: add support for console sessions to crashpad and crash handling in kernel

kernel/src/Api/BuildNo.hpp

@@ -12,4 +12,4 @@
 
 #pragma once
 
-#define MONTAUK_BUILD_NUMBER 112
+#define MONTAUK_BUILD_NUMBER 115

kernel/src/Hal/IDT.cpp

@@ -141,7 +141,7 @@ namespace Hal {
             rep.timestampTick = Timekeeping::GetTicks();
 
             CrashReport::AddReport(rep);
-            Sched::SpawnCrashPad();
+            Sched::SpawnCrashPad(proc->pid);
 
             Sched::ExitProcess();
             __builtin_unreachable();

kernel/src/Sched/Scheduler.cpp

@@ -1388,11 +1388,57 @@ namespace Sched {
         return &processTable[slot];
     }
 
-    int SpawnCrashPad() {
+    int SpawnCrashPad(int crasherPid) {
         // Spawn crashpad as a child of init (slot 0), not the crashing process.
-        // We can't use the current process context since we're in ExitProcess.
+        // The crasher is still alive here (we run before its ExitProcess), but
+        // it is about to die, so we must not parent the crashpad to it.
         static constexpr const char* crashpadPath = "0:/apps/crashpad/crashpad.elf";
-        return Spawn(crashpadPath, nullptr);
+
+        // If the crashing process had a redirected console (i.e. it was running
+        // under terminal.elf in a console session), hand the crashpad a write
+        // handle to that same out-stream so it can surface a textual crash
+        // report to the console user when no desktop is running.
+        Process* crasher     = GetProcessByPid(crasherPid);
+        int      crasherSlot = Ipc::SlotForPid(crasherPid);
+        bool     inheritRedir = crasher && crasher->redirected &&
+                                crasher->ioOutHandle >= 0 && crasherSlot >= 0;
+
+        Ipc::Object*    outObj = nullptr;
+        Ipc::HandleType outType = Ipc::HandleType::None;
+        uint32_t        outRights = 0;
+        if (inheritRedir) {
+            if (!Ipc::SnapshotHandleForSlot(crasherSlot, crasher->ioOutHandle,
+                                            outType, outObj, outRights) ||
+                outType != Ipc::HandleType::Stream || outObj == nullptr) {
+                inheritRedir = false;
+            }
+        }
+
+        // Deferred start when inheriting, so we can wire ioOutHandle before _start.
+        int childPid = Spawn(crashpadPath, nullptr, /*startReady=*/!inheritRedir);
+        if (childPid < 0 || !inheritRedir) return childPid;
+
+        Process* child     = GetProcessByPid(childPid);
+        int      childSlot = Ipc::SlotForPid(childPid);
+        if (child && childSlot >= 0) {
+            // Installing with RightWrite retains the stream (writerRefs++/refs++),
+            // so it outlives the crasher's imminent ExitProcess teardown. The
+            // snapshot above and this install run back-to-back with no blocking
+            // call between, while the crasher's handle still pins the stream.
+            int h = Ipc::InstallHandleForSlot(childSlot, outObj, Ipc::HandleType::Stream,
+                                              Ipc::RightWrite | Ipc::RightWait | Ipc::RightDup);
+            if (h >= 0) {
+                child->ioOutHandle = h;
+                child->redirected  = true;
+                child->parentPid   = crasherPid;
+                child->termCols    = crasher->termCols;
+                child->termRows    = crasher->termRows;
+            }
+        }
+
+        // Always start it (even if wiring failed -> it just falls back to silent).
+        StartProcess(childPid);
+        return childPid;
     }
 
 }

kernel/src/Sched/Scheduler.hpp

@@ -190,9 +190,11 @@ namespace Sched {
     // Find a process by PID (returns nullptr if not found or not alive)
     Process* GetProcessByPid(int pid);
 
-    // Spawn a crashpad process with the given crash file path as argument.
-    // Called by the exception handler when a process faults.
-    int SpawnCrashPad();
+    // Spawn the crashpad to report on a faulted process (pid `crasherPid`).
+    // Called by the exception handler when a process faults. If the crasher had
+    // a redirected console, the crashpad inherits its out-stream so it can print
+    // a textual report to a console session with no desktop.
+    int SpawnCrashPad(int crasherPid);
 
     // Get a pointer to slot i in the process table (for enumeration)
     Process* GetProcessSlot(int slot);