[PATCH v4 09/11] ntoskrnl.exe: Implement PsIsSystemThread.

[Derek Lesho]

Signed-off-by: Derek Lesho 
---
 dlls/ntoskrnl.exe/ntoskrnl.c        |  9 +++++++++
 dlls/ntoskrnl.exe/ntoskrnl.exe.spec |  2 +-
 dlls/ntoskrnl.exe/tests/driver.c    | 18 ++++++++++++++++++
 include/ddk/ntifs.h                 |  1 +
 4 files changed, 29 insertions(+), 1 deletion(-)

diff --git a/dlls/ntoskrnl.exe/ntoskrnl.c b/dlls/ntoskrnl.exe/ntoskrnl.c
index eec14b7608..f74c2362de 100644
--- a/dlls/ntoskrnl.exe/ntoskrnl.c
+++ b/dlls/ntoskrnl.exe/ntoskrnl.c
@@ -3015,6 +3015,15 @@ HANDLE WINAPI PsGetCurrentThreadId(void)
 }

+/***********************************************************************
+ *           PsIsSystemThread   (NTOSKRNL.EXE.@)
+ */
+BOOLEAN WINAPI PsIsSystemThread(PETHREAD thread)
+{
+    return ((PKTHREAD)thread)->process == PsInitialSystemProcess;
+}
+
+
 /***********************************************************************
  *           PsGetVersion   (NTOSKRNL.EXE.@)
  */
diff --git a/dlls/ntoskrnl.exe/ntoskrnl.exe.spec b/dlls/ntoskrnl.exe/ntoskrnl.exe.spec
index 7f09ba644c..8c347999ba 100644
--- a/dlls/ntoskrnl.exe/ntoskrnl.exe.spec
+++ b/dlls/ntoskrnl.exe/ntoskrnl.exe.spec
@@ -907,7 +907,7 @@
 @ stdcall PsImpersonateClient(ptr ptr long long long)
 @ extern PsInitialSystemProcess
 @ stub PsIsProcessBeingDebugged
-@ stub PsIsSystemThread
+@ stdcall PsIsSystemThread(ptr)
 @ stub PsIsThreadImpersonating
 @ stub PsIsThreadTerminating
 @ stub PsJobType
diff --git a/dlls/ntoskrnl.exe/tests/driver.c b/dlls/ntoskrnl.exe/tests/driver.c
index 79923b9852..0968581114 100644
--- a/dlls/ntoskrnl.exe/tests/driver.c
+++ b/dlls/ntoskrnl.exe/tests/driver.c
@@ -29,6 +29,7 @@
 #include "winternl.h"
 #include "winioctl.h"
 #include "ddk/ntddk.h"
+#include "ddk/ntifs.h"
 #include "ddk/wdm.h"

#include "driver.h"
@@ -1182,6 +1183,22 @@ static void test_lookup_thread(void)
     ok(status == STATUS_INVALID_PARAMETER, "PsLookupThreadByThreadId returned %#x\n", status);
 }

+static void WINAPI system_thread( void *arg )
+{
+    BOOLEAN result = PsIsSystemThread((PETHREAD)KeGetCurrentThread());
+    ok((result), "got %u\n", result);
+
+    PsTerminateSystemThread( STATUS_SUCCESS );
+}
+
+static void test_system_thread(void)
+{
+    BOOLEAN result = PsIsSystemThread((PETHREAD)KeGetCurrentThread());
+    ok(!(result), "got %u\n", result);
+
+    run_thread( system_thread, (void*)0 );
+}
+
 static NTSTATUS main_test(DEVICE_OBJECT *device, IRP *irp, IO_STACK_LOCATION *stack, ULONG_PTR *info)
 {
     ULONG length = stack->Parameters.DeviceIoControl.OutputBufferLength;
@@ -1226,6 +1243,7 @@ static NTSTATUS main_test(DEVICE_OBJECT *device, IRP *irp, IO_STACK_LOCATION *st
     test_ob_reference(test_input->path);
     test_resource();
     test_lookup_thred();
+    test_system_thread();

/* print process report */
     if (winetest_debug)
diff --git a/include/ddk/ntifs.h b/include/ddk/ntifs.h
index ec4d1d5aa7..2c61329d9e 100644
--- a/include/ddk/ntifs.h
+++ b/include/ddk/ntifs.h
@@ -131,6 +131,7 @@ typedef struct _FS_FILTER_CALLBACKS

BOOLEAN WINAPI FsRtlIsNameInExpression(PUNICODE_STRING, PUNICODE_STRING, BOOLEAN, PWCH);
 NTSTATUS WINAPI ObQueryNameString(PVOID,POBJECT_NAME_INFORMATION,ULONG,PULONG);
+BOOLEAN WINAPI PsIsSystemThread(PETHREAD);
 NTSTATUS WINAPI PsLookupProcessByProcessId(HANDLE,PEPROCESS*);
 NTSTATUS WINAPI PsLookupThreadByThreadId(HANDLE,PETHREAD*);
 void WINAPI PsRevertToSelf(void);