361 lines
9.8 KiB
C
361 lines
9.8 KiB
C
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/*++
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Copyright (c) 1990 Microsoft Corporation
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Module Name:
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handle.c
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Abstract:
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This module implements the Win32 handle management services.
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Author:
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Mark Lucovsky (markl) 21-Sep-1990
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Revision History:
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--*/
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#include "basedll.h"
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BOOL
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CloseHandle(
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HANDLE hObject
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)
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/*++
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Routine Description:
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An open handle to any object can be closed using CloseHandle.
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This is a generic function and operates on the following object
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types:
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- Process Object
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- Thread Object
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- Mutex Object
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- Event Object
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- Semaphore Object
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- File Object
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Please note that Module Objects are not in this list.
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Closing an open handle to an object causes the handle to become
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invalid and the HandleCount of the associated object to be
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decremented and object retention checks to be performed. Once the
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last open handle to an object is closed, the object is removed from
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the system.
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Arguments:
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hObject - An open handle to an object.
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Return Value:
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TRUE - The operation was successful.
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FALSE/NULL - The operation failed. Extended error status is available
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using GetLastError.
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--*/
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{
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NTSTATUS Status;
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PPEB Peb;
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Peb = NtCurrentPeb();
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switch( HandleToUlong(hObject) ) {
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case STD_INPUT_HANDLE: hObject = Peb->ProcessParameters->StandardInput;
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break;
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case STD_OUTPUT_HANDLE: hObject = Peb->ProcessParameters->StandardOutput;
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break;
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case STD_ERROR_HANDLE: hObject = Peb->ProcessParameters->StandardError;
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break;
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}
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if (CONSOLE_HANDLE(hObject)) {
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return CloseConsoleHandle(hObject);
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}
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Status = NtClose(hObject);
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if ( NT_SUCCESS(Status) ) {
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return TRUE;
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}
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else {
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BaseSetLastNTError(Status);
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return FALSE;
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}
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}
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BOOL
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DuplicateHandle(
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HANDLE hSourceProcessHandle,
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HANDLE hSourceHandle,
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HANDLE hTargetProcessHandle,
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LPHANDLE lpTargetHandle,
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DWORD dwDesiredAccess,
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BOOL bInheritHandle,
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DWORD dwOptions
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)
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/*++
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Routine Description:
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A duplicate handle can be created with the DuplicateHandle function.
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This is a generic function and operates on the following object
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types:
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- Process Object
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- Thread Object
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- Mutex Object
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- Event Object
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- Semaphore Object
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- File Object
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Please note that Module Objects are not in this list.
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This function requires PROCESS_DUP_ACCESS to both the
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SourceProcessHandle and the TargetProcessHandle. This function is
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used to pass an object handle from one process to another. Once
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this call is complete, the target process needs to be informed of
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the value of the target handle. The target process can then operate
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on the object using this handle value.
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Arguments:
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hSourceProcessHandle - An open handle to the process that contains the
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handle to be duplicated. The handle must have been created with
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PROCESS_DUP_HANDLE access to the process.
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hSourceHandle - An open handle to any object that is valid in the
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context of the source process.
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hTargetProcessHandle - An open handle to the process that is to
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receive the duplicated handle. The handle must have been
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created with PROCESS_DUP_HANDLE access to the process.
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lpTargetHandle - A pointer to a variable which receives the new handle
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that points to the same object as SourceHandle does. This
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handle value is valid in the context of the target process.
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dwDesiredAccess - The access requested to for the new handle. This
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parameter is ignored if the DUPLICATE_SAME_ACCESS option is
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specified.
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bInheritHandle - Supplies a flag that if TRUE, marks the target
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handle as inheritable. If this is the case, then the target
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handle will be inherited to new processes each time the target
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process creates a new process using CreateProcess.
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dwOptions - Specifies optional behaviors for the caller.
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Options Flags:
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DUPLICATE_CLOSE_SOURCE - The SourceHandle will be closed by
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this service prior to returning to the caller. This occurs
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regardless of any error status returned.
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DUPLICATE_SAME_ACCESS - The DesiredAccess parameter is ignored
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and instead the GrantedAccess associated with SourceHandle
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is used as the DesiredAccess when creating the TargetHandle.
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Return Value:
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TRUE - The operation was successful.
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FALSE/NULL - The operation failed. Extended error status is available
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using GetLastError.
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--*/
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{
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NTSTATUS Status;
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PPEB Peb;
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Peb = NtCurrentPeb();
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switch( HandleToUlong(hSourceHandle) ) {
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case STD_INPUT_HANDLE: hSourceHandle = Peb->ProcessParameters->StandardInput;
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break;
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case STD_OUTPUT_HANDLE: hSourceHandle = Peb->ProcessParameters->StandardOutput;
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break;
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case STD_ERROR_HANDLE: hSourceHandle = Peb->ProcessParameters->StandardError;
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break;
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}
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if (CONSOLE_HANDLE(hSourceHandle) &&
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(hSourceHandle != NtCurrentProcess() &&
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hSourceHandle != NtCurrentThread()) ) {
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HANDLE Target;
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if (hSourceProcessHandle != NtCurrentProcess() ||
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hTargetProcessHandle != NtCurrentProcess()) {
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BaseSetLastNTError(STATUS_INVALID_PARAMETER);
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return FALSE;
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}
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Target = DuplicateConsoleHandle(hSourceHandle,
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dwDesiredAccess,
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bInheritHandle,
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dwOptions
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);
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if (Target == INVALID_HANDLE_VALUE) {
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return FALSE;
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}
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else {
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try {
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if ( ARGUMENT_PRESENT(lpTargetHandle) ) {
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*lpTargetHandle = Target;
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}
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}
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except (EXCEPTION_EXECUTE_HANDLER) {
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return TRUE;
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}
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return TRUE;
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}
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}
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Status = NtDuplicateObject(
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hSourceProcessHandle,
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hSourceHandle,
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hTargetProcessHandle,
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lpTargetHandle,
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(ACCESS_MASK)dwDesiredAccess,
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bInheritHandle ? OBJ_INHERIT : 0,
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dwOptions
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);
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if ( NT_SUCCESS(Status) ) {
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return TRUE;
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}
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else {
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BaseSetLastNTError(Status);
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return FALSE;
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}
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return FALSE;
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}
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BOOL
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GetHandleInformation(
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HANDLE hObject,
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LPDWORD lpdwFlags
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)
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{
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NTSTATUS Status;
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OBJECT_HANDLE_FLAG_INFORMATION HandleInfo;
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DWORD Result;
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PPEB Peb;
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Peb = NtCurrentPeb();
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switch( HandleToUlong(hObject) ) {
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case STD_INPUT_HANDLE: hObject = Peb->ProcessParameters->StandardInput;
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break;
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case STD_OUTPUT_HANDLE: hObject = Peb->ProcessParameters->StandardOutput;
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break;
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case STD_ERROR_HANDLE: hObject = Peb->ProcessParameters->StandardError;
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break;
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}
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if (CONSOLE_HANDLE(hObject)) {
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return GetConsoleHandleInformation(hObject,
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lpdwFlags
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);
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}
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Status = NtQueryObject( hObject,
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ObjectHandleFlagInformation,
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&HandleInfo,
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sizeof( HandleInfo ),
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NULL
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);
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if (NT_SUCCESS( Status )) {
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Result = 0;
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if (HandleInfo.Inherit) {
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Result |= HANDLE_FLAG_INHERIT;
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}
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if (HandleInfo.ProtectFromClose) {
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Result |= HANDLE_FLAG_PROTECT_FROM_CLOSE;
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}
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*lpdwFlags = Result;
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return TRUE;
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}
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else {
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BaseSetLastNTError( Status );
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return FALSE;
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}
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}
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BOOL
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SetHandleInformation(
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HANDLE hObject,
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DWORD dwMask,
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DWORD dwFlags
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)
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{
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NTSTATUS Status;
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OBJECT_HANDLE_FLAG_INFORMATION HandleInfo;
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PPEB Peb;
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Peb = NtCurrentPeb();
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switch( HandleToUlong(hObject) ) {
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case STD_INPUT_HANDLE: hObject = Peb->ProcessParameters->StandardInput;
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break;
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case STD_OUTPUT_HANDLE: hObject = Peb->ProcessParameters->StandardOutput;
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break;
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case STD_ERROR_HANDLE: hObject = Peb->ProcessParameters->StandardError;
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break;
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}
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if (CONSOLE_HANDLE(hObject)) {
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return SetConsoleHandleInformation(hObject,
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dwMask,
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dwFlags
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);
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}
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Status = NtQueryObject( hObject,
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ObjectHandleFlagInformation,
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&HandleInfo,
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sizeof( HandleInfo ),
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NULL
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);
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if (NT_SUCCESS( Status )) {
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if (dwMask & HANDLE_FLAG_INHERIT) {
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HandleInfo.Inherit = (dwFlags & HANDLE_FLAG_INHERIT) ? TRUE : FALSE;
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}
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if (dwMask & HANDLE_FLAG_PROTECT_FROM_CLOSE) {
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HandleInfo.ProtectFromClose = (dwFlags & HANDLE_FLAG_PROTECT_FROM_CLOSE) ? TRUE : FALSE;
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}
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Status = NtSetInformationObject( hObject,
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ObjectHandleFlagInformation,
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&HandleInfo,
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sizeof( HandleInfo )
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);
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if (NT_SUCCESS( Status )) {
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return TRUE;
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}
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}
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BaseSetLastNTError( Status );
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return FALSE;
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}
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