196 lines
4.1 KiB
C
196 lines
4.1 KiB
C
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/*++
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Copyright (c) 1989 Microsoft Corporation
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Module Name:
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pscid.c
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Abstract:
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This module implements the Client ID related services.
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Author:
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Mark Lucovsky (markl) 25-Apr-1989
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Jim Kelly (JimK) 2-August-1990
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Revision History:
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--*/
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#include "psp.h"
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NTSTATUS
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PsLookupProcessThreadByCid(
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IN PCLIENT_ID Cid,
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OUT PEPROCESS *Process OPTIONAL,
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OUT PETHREAD *Thread
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)
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/*++
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Routine Description:
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This function accepts The Client ID of a thread, and returns a
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referenced pointer to the thread, and possibly a referenced pointer
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to the process.
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Arguments:
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Cid - Specifies the Client ID of the thread.
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Process - If specified, returns a referenced pointer to the process
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specified in the Cid.
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Thread - Returns a referenced pointer to the thread specified in the
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Cid.
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Return Value:
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STATUS_SUCCESS - A process and thread were located based on the contents
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of the Cid.
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STATUS_INVALID_CID - The specified Cid is invalid.
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--*/
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{
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PHANDLE_TABLE_ENTRY CidEntry;
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PETHREAD lThread;
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NTSTATUS Status;
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CidEntry = ExMapHandleToPointer(PspCidTable, Cid->UniqueThread);
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Status = STATUS_INVALID_CID;
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if (CidEntry != NULL) {
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lThread = (PETHREAD)CidEntry->Object;
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if ((lThread != (PETHREAD)PSP_INVALID_ID) &&
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(
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lThread->Tcb.Header.Type == ThreadObject &&
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lThread->Cid.UniqueProcess == Cid->UniqueProcess &&
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lThread->GrantedAccess
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) ) {
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if (ARGUMENT_PRESENT(Process)) {
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*Process = THREAD_TO_PROCESS(lThread);
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ObReferenceObject(*Process);
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}
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ObReferenceObject(lThread);
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*Thread = lThread;
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Status = STATUS_SUCCESS;
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}
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ExUnlockHandleTableEntry(PspCidTable, CidEntry);
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}
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return Status;
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}
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NTSTATUS
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PsLookupProcessByProcessId(
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IN HANDLE ProcessId,
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OUT PEPROCESS *Process
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)
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/*++
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Routine Description:
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This function accepts the process id of a process and returns a
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referenced pointer to the process.
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Arguments:
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ProcessId - Specifies the Process ID of the process.
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Process - Returns a referenced pointer to the process specified by the
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process id.
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Return Value:
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STATUS_SUCCESS - A process was located based on the contents of
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the process id.
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STATUS_INVALID_PARAMETER - The process was not found.
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--*/
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{
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PHANDLE_TABLE_ENTRY CidEntry;
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PEPROCESS lProcess;
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NTSTATUS Status;
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CidEntry = ExMapHandleToPointer(PspCidTable, ProcessId);
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Status = STATUS_INVALID_PARAMETER;
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if (CidEntry != NULL) {
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lProcess = (PEPROCESS)CidEntry->Object;
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if (lProcess != (PEPROCESS)PSP_INVALID_ID && lProcess->Pcb.Header.Type == ProcessObject && lProcess->GrantedAccess ) {
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ObReferenceObject(lProcess);
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*Process = lProcess;
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Status = STATUS_SUCCESS;
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}
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ExUnlockHandleTableEntry(PspCidTable, CidEntry);
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}
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return Status;
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}
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NTSTATUS
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PsLookupThreadByThreadId(
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IN HANDLE ThreadId,
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OUT PETHREAD *Thread
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)
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/*++
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Routine Description:
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This function accepts the thread id of a thread and returns a
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referenced pointer to the thread.
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Arguments:
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ThreadId - Specifies the Thread ID of the thread.
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Thread - Returns a referenced pointer to the thread specified by the
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thread id.
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Return Value:
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STATUS_SUCCESS - A thread was located based on the contents of
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the thread id.
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STATUS_INVALID_PARAMETER - The thread was not found.
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--*/
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{
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PHANDLE_TABLE_ENTRY CidEntry;
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PETHREAD lThread;
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NTSTATUS Status;
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CidEntry = ExMapHandleToPointer(PspCidTable, ThreadId);
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Status = STATUS_INVALID_PARAMETER;
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if (CidEntry != NULL) {
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lThread = (PETHREAD)CidEntry->Object;
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if (lThread != (PETHREAD)PSP_INVALID_ID && lThread->Tcb.Header.Type == ThreadObject && lThread->GrantedAccess ) {
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ObReferenceObject(lThread);
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*Thread = lThread;
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Status = STATUS_SUCCESS;
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}
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ExUnlockHandleTableEntry(PspCidTable, CidEntry);
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}
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return Status;
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}
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