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647 lines
14 KiB
647 lines
14 KiB
/*++
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Copyright (c) 1989 Microsoft Corporation
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Module Name:
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psspnd.c
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Abstract:
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This module implements NtSuspendThread and NtResumeThread
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Author:
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Mark Lucovsky (markl) 25-May-1989
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Revision History:
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--*/
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#include "psp.h"
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#ifdef ALLOC_PRAGMA
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#pragma alloc_text(PAGE, NtSuspendThread)
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#pragma alloc_text(PAGE, NtResumeThread)
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#pragma alloc_text(PAGE, NtAlertThread)
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#pragma alloc_text(PAGE, NtAlertResumeThread)
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#pragma alloc_text(PAGE, NtTestAlert)
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#pragma alloc_text(PAGE, NtSuspendProcess)
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#pragma alloc_text(PAGE, NtResumeProcess)
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#pragma alloc_text(PAGE, PsSuspendThread)
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#pragma alloc_text(PAGE, PsSuspendProcess)
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#pragma alloc_text(PAGE, PsResumeProcess)
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#pragma alloc_text(PAGE, PsResumeThread)
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#endif
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NTSTATUS
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PsSuspendThread (
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IN PETHREAD Thread,
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OUT PULONG PreviousSuspendCount OPTIONAL
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)
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/*++
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Routine Description:
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This function suspends the target thread, and optionally
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returns the previous suspend count.
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Arguments:
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ThreadHandle - Supplies a handle to the thread object to suspend.
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PreviousSuspendCount - An optional parameter, that if specified
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points to a variable that receives the thread's previous suspend
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count.
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Return Value:
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NTSTATUS - Status of call
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--*/
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{
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NTSTATUS Status;
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ULONG LocalPreviousSuspendCount = 0;
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PAGED_CODE();
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if (Thread == PsGetCurrentThread ()) {
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try {
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LocalPreviousSuspendCount = (ULONG) KeSuspendThread (&Thread->Tcb);
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Status = STATUS_SUCCESS;
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} except ((GetExceptionCode () == STATUS_SUSPEND_COUNT_EXCEEDED)?
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EXCEPTION_EXECUTE_HANDLER :
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EXCEPTION_CONTINUE_SEARCH) {
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Status = GetExceptionCode();
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}
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} else {
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//
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// Protect the remote thread from being rundown.
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//
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if (ExAcquireRundownProtection (&Thread->RundownProtect)) {
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//
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// Don't allow suspend if we are being deleted
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//
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if (Thread->CrossThreadFlags&PS_CROSS_THREAD_FLAGS_TERMINATED) {
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Status = STATUS_THREAD_IS_TERMINATING;
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} else {
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try {
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LocalPreviousSuspendCount = (ULONG) KeSuspendThread (&Thread->Tcb);
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Status = STATUS_SUCCESS;
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} except ((GetExceptionCode () == STATUS_SUSPEND_COUNT_EXCEEDED)?
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EXCEPTION_EXECUTE_HANDLER :
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EXCEPTION_CONTINUE_SEARCH) {
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Status = GetExceptionCode();
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}
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//
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// If deletion was started after we suspended then wake up the thread
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//
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if (Thread->CrossThreadFlags&PS_CROSS_THREAD_FLAGS_TERMINATED) {
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KeForceResumeThread (&Thread->Tcb);
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LocalPreviousSuspendCount = 0;
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Status = STATUS_THREAD_IS_TERMINATING;
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}
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}
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ExReleaseRundownProtection (&Thread->RundownProtect);
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} else {
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Status = STATUS_THREAD_IS_TERMINATING;
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}
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}
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if (ARGUMENT_PRESENT (PreviousSuspendCount)) {
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*PreviousSuspendCount = LocalPreviousSuspendCount;
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}
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return Status;
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}
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NTSTATUS
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PsSuspendProcess (
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PEPROCESS Process
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)
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/*++
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Routine Description:
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This function suspends all the PS threads in a process.
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Arguments:
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Process - Process whose threads are to be suspended
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Return Value:
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NTSTATUS - Status of operation.
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--*/
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{
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NTSTATUS Status;
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PETHREAD Thread;
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PAGED_CODE ();
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if (ExAcquireRundownProtection (&Process->RundownProtect)) {
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for (Thread = PsGetNextProcessThread (Process, NULL);
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Thread != NULL;
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Thread = PsGetNextProcessThread (Process, Thread)) {
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PsSuspendThread (Thread, NULL);
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}
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ExReleaseRundownProtection (&Process->RundownProtect);
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Status = STATUS_SUCCESS;
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} else {
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Status = STATUS_PROCESS_IS_TERMINATING;
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}
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return Status;
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}
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NTSTATUS
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PsResumeProcess (
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PEPROCESS Process
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)
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/*++
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Routine Description:
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This function resumes all the PS threads in a process.
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Arguments:
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Process - Process whose threads are to be suspended
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Return Value:
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NTSTATUS - Status of operation.
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--*/
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{
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NTSTATUS Status;
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PETHREAD Thread;
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PAGED_CODE ();
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if (ExAcquireRundownProtection (&Process->RundownProtect)) {
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for (Thread = PsGetNextProcessThread (Process, NULL);
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Thread != NULL;
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Thread = PsGetNextProcessThread (Process, Thread)) {
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KeResumeThread (&Thread->Tcb);
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}
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ExReleaseRundownProtection (&Process->RundownProtect);
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Status = STATUS_SUCCESS;
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} else {
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Status = STATUS_PROCESS_IS_TERMINATING;
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}
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return Status;
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}
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NTSTATUS
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NtSuspendThread(
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IN HANDLE ThreadHandle,
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OUT PULONG PreviousSuspendCount OPTIONAL
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)
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/*++
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Routine Description:
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This function suspends the target thread, and optionally
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returns the previous suspend count.
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Arguments:
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ThreadHandle - Supplies a handle to the thread object to suspend.
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PreviousSuspendCount - An optional parameter, that if specified
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points to a variable that receives the thread's previous suspend
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count.
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Return Value:
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NTSTATUS - Status of operation.
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--*/
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{
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PETHREAD Thread;
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NTSTATUS st;
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ULONG LocalPreviousSuspendCount;
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KPROCESSOR_MODE Mode;
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PAGED_CODE();
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Mode = KeGetPreviousMode ();
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try {
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if (Mode != KernelMode) {
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if (ARGUMENT_PRESENT (PreviousSuspendCount)) {
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ProbeForWriteUlong (PreviousSuspendCount);
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}
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}
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} except (EXCEPTION_EXECUTE_HANDLER) {
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return GetExceptionCode();
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}
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st = ObReferenceObjectByHandle (ThreadHandle,
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THREAD_SUSPEND_RESUME,
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PsThreadType,
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Mode,
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&Thread,
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NULL);
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if (!NT_SUCCESS (st)) {
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return st;
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}
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st = PsSuspendThread (Thread, &LocalPreviousSuspendCount);
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ObDereferenceObject (Thread);
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try {
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if (ARGUMENT_PRESENT (PreviousSuspendCount)) {
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*PreviousSuspendCount = LocalPreviousSuspendCount;
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}
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} except (EXCEPTION_EXECUTE_HANDLER) {
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st = GetExceptionCode ();
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}
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return st;
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}
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NTSTATUS
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PsResumeThread (
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IN PETHREAD Thread,
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OUT PULONG PreviousSuspendCount OPTIONAL
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)
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/*++
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Routine Description:
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This function resumes a thread that was previously suspened
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Arguments:
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Thread - Thread to resume
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PreviousSuspendCount - Optional address of a ULONG to place the previous suspend count in
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Return Value:
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NTSTATUS - Status of call
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--*/
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{
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ULONG LocalPreviousSuspendCount;
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PAGED_CODE();
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LocalPreviousSuspendCount = (ULONG) KeResumeThread (&Thread->Tcb);
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if (ARGUMENT_PRESENT (PreviousSuspendCount)) {
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*PreviousSuspendCount = LocalPreviousSuspendCount;
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}
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return STATUS_SUCCESS;
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}
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NTSTATUS
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NtResumeThread(
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IN HANDLE ThreadHandle,
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OUT PULONG PreviousSuspendCount OPTIONAL
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)
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/*++
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Routine Description:
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This function resumes a thread that was previously suspened
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Arguments:
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ThreadHandle - Handle to thread to resume
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PreviousSuspendCount - Optional address of a ULONG to place the previous suspend count in
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Return Value:
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NTSTATUS - Status of call
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--*/
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{
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PETHREAD Thread;
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NTSTATUS st;
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KPROCESSOR_MODE Mode;
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ULONG LocalPreviousSuspendCount;
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PAGED_CODE();
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Mode = KeGetPreviousMode ();
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try {
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if (Mode != KernelMode) {
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if (ARGUMENT_PRESENT (PreviousSuspendCount)) {
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ProbeForWriteUlong (PreviousSuspendCount);
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}
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}
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} except (EXCEPTION_EXECUTE_HANDLER) {
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return GetExceptionCode ();
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}
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st = ObReferenceObjectByHandle (ThreadHandle,
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THREAD_SUSPEND_RESUME,
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PsThreadType,
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Mode,
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&Thread,
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NULL);
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if (!NT_SUCCESS (st)) {
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return st;
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}
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PsResumeThread (Thread, &LocalPreviousSuspendCount);
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ObDereferenceObject (Thread);
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try {
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if (ARGUMENT_PRESENT (PreviousSuspendCount)) {
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*PreviousSuspendCount = LocalPreviousSuspendCount;
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}
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} except (EXCEPTION_EXECUTE_HANDLER) {
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return GetExceptionCode ();
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}
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return STATUS_SUCCESS;
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}
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NTSTATUS
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NtSuspendProcess (
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IN HANDLE ProcessHandle
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)
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/*++
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Routine Description:
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This function suspends all none-exiting threads in the target process
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Arguments:
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ProcessHandle - Supplies an open handle to the process to be suspened
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Return Value:
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NTSTATUS - Status of operation
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--*/
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{
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KPROCESSOR_MODE PreviousMode;
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NTSTATUS Status;
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PEPROCESS Process;
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PAGED_CODE();
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PreviousMode = KeGetPreviousMode ();
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Status = ObReferenceObjectByHandle (ProcessHandle,
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PROCESS_SET_PORT,
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PsProcessType,
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PreviousMode,
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&Process,
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NULL);
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if (NT_SUCCESS (Status)) {
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Status = PsSuspendProcess (Process);
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ObDereferenceObject (Process);
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}
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return Status;
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}
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NTSTATUS
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NtResumeProcess (
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IN HANDLE ProcessHandle
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)
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/*++
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Routine Description:
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This function suspends all none-exiting threads in the target process
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Arguments:
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ProcessHandle - Supplies an open handle to the process to be suspened
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Return Value:
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NTSTATUS - Status of operation
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--*/
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{
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KPROCESSOR_MODE PreviousMode;
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NTSTATUS Status;
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PEPROCESS Process;
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PAGED_CODE();
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PreviousMode = KeGetPreviousMode ();
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Status = ObReferenceObjectByHandle (ProcessHandle,
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PROCESS_SET_PORT,
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PsProcessType,
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PreviousMode,
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&Process,
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NULL);
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if (NT_SUCCESS (Status)) {
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Status = PsResumeProcess (Process);
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ObDereferenceObject (Process);
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}
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return Status;
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}
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NTSTATUS
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NtAlertThread(
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IN HANDLE ThreadHandle
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)
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/*++
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Routine Description:
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This function alerts the target thread using the previous mode
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as the mode of the alert.
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Arguments:
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ThreadHandle - Supplies an open handle to the thread to be alerted
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Return Value:
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NTSTATUS - Status of operation
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--*/
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{
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PETHREAD Thread;
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NTSTATUS st;
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KPROCESSOR_MODE Mode;
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PAGED_CODE();
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Mode = KeGetPreviousMode ();
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st = ObReferenceObjectByHandle (ThreadHandle,
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THREAD_ALERT,
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PsThreadType,
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Mode,
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&Thread,
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NULL);
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if (!NT_SUCCESS (st)) {
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return st;
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}
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KeAlertThread (&Thread->Tcb,Mode);
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ObDereferenceObject (Thread);
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return STATUS_SUCCESS;
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}
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NTSTATUS
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NtAlertResumeThread(
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IN HANDLE ThreadHandle,
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OUT PULONG PreviousSuspendCount OPTIONAL
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)
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/*++
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Routine Description:
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description-of-function.
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Arguments:
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argument-name - Supplies | Returns description of argument.
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.
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.
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Return Value:
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NTSTATUS - Status of operation
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--*/
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{
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PETHREAD Thread;
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NTSTATUS st;
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ULONG LocalPreviousSuspendCount;
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KPROCESSOR_MODE Mode;
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PAGED_CODE();
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Mode = KeGetPreviousMode ();
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try {
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if (Mode != KernelMode ) {
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if (ARGUMENT_PRESENT (PreviousSuspendCount)) {
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ProbeForWriteUlong (PreviousSuspendCount);
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}
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}
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} except (EXCEPTION_EXECUTE_HANDLER) {
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return GetExceptionCode();
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}
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st = ObReferenceObjectByHandle (ThreadHandle,
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THREAD_SUSPEND_RESUME,
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PsThreadType,
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Mode,
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&Thread,
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NULL);
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if (!NT_SUCCESS (st)) {
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return st;
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}
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LocalPreviousSuspendCount = (ULONG) KeAlertResumeThread (&Thread->Tcb);
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ObDereferenceObject (Thread);
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try {
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if (ARGUMENT_PRESENT (PreviousSuspendCount)) {
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*PreviousSuspendCount = LocalPreviousSuspendCount;
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}
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} except (EXCEPTION_EXECUTE_HANDLER) {
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return GetExceptionCode ();
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}
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return STATUS_SUCCESS;
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}
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NTSTATUS
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NtTestAlert(
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VOID
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)
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/*++
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Routine Description:
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This function tests the alert flag inside the current thread. If
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an alert is pending for the previous mode, then the alerted status
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is returned, pending APC's may also be delivered at this time.
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Arguments:
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None
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Return Value:
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STATUS_ALERTED - An alert was pending for the current thread at the
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time this function was called.
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STATUS_SUCCESS - No alert was pending for this thread.
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--*/
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{
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PAGED_CODE();
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if (KeTestAlertThread(KeGetPreviousMode ())) {
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return STATUS_ALERTED;
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} else {
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return STATUS_SUCCESS;
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}
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}
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