mirror of
https://github.com/reactos/reactos.git
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115 lines
4.7 KiB
C
115 lines
4.7 KiB
C
/*
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* COPYRIGHT: See COPYING in the top level directory
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* PROJECT: ReactOS user32.dll
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* FILE: lib/user32/misc/exit.c
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* PURPOSE: Shutdown related functions
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* PROGRAMMER: Eric Kohl
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*/
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#include <user32.h>
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#include <wine/debug.h>
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/*
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* Sequence of events:
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*
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* - App (usually explorer) calls ExitWindowsEx()
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* - ExitWindowsEx() sends a message to CSRSS
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* - CSRSS impersonates the caller and sends a message to a hidden WinLogon window
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* - WinLogon checks if the caller has the required privileges
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* - WinLogon enters pending log-out state
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* - WinLogon impersonates the interactive user and calls ExitWindowsEx() again,
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* passing some special internal flags
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* - CSRSS loops over all processes of the interactive user (sorted by their
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* SetProcessShutdownParameters() level), sending WM_QUERYENDSESSION and
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* WM_ENDSESSION messages to its top-level windows. If the messages aren't
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* processed within the timeout period (registry key HKCU\Control Panel\Desktop\HungAppTimeout)
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* CSRSS will put up a dialog box asking if the process should be terminated.
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* Using the registry key HKCU\Control Panel\Desktop\AutoEndTask you can
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* specify that the dialog box shouldn't be shown and CSRSS should just
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* terminate the thread. If the the WM_ENDSESSION message is processed
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* but the thread doesn't terminate within the timeout specified by
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* HKCU\Control Panel\Desktop\WaitToKillAppTimeout CSRSS will terminate
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* the thread. When all the top-level windows have been destroyed CSRSS
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* will terminate the process.
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* If the process is a console process, CSRSS will send a CTRL_LOGOFF_EVENT
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* to the console control handler on logoff. No event is sent on shutdown.
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* If the handler doesn't respond in time the same activities as for GUI
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* apps (i.e. display dialog box etc) take place. This also happens if
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* the handler returns TRUE.
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* - This ends the processing for the first ExitWindowsEx() call from WinLogon.
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* Execution continues in WinLogon, which calls ExitWindowsEx() again to
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* terminate COM processes in the interactive user's session.
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* - WinLogon stops impersonating the interactive user (whos processes are
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* all dead by now). and enters log-out state
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* - If the ExitWindowsEx() request was for a logoff, WinLogon sends a SAS
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* event (to display the "press ctrl+alt+del") to the GINA. WinLogon then
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* waits for the GINA to send a SAS event to login.
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* - If the ExitWindowsEx() request was for shutdown/restart, WinLogon calls
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* ExitWindowsEx() again in the system process context.
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* - CSRSS goes through the motions of sending WM_QUERYENDSESSION/WM_ENDSESSION
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* to GUI processes running in the system process context but won't display
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* dialog boxes or kill threads/processes. Same for console processes,
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* using the CTRL_SHUTDOWN_EVENT. The Service Control Manager is one of
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* these console processes and has a special timeout value WaitToKillServiceTimeout.
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* - WinLogon issues a "InitiateSystemShutdown" request to the SM (SMSS API # 1)
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* - the SM propagates the shutdown request to every environment subsystem it
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* started since bootstrap time (still active ones, of course)
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* - each environment subsystem, on shutdown request, releases every resource
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* it aquired during its life (processes, memory etc), then dies
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* - when every environment subsystem has gone to bed, the SM actually initiates
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* the kernel and executive shutdown by calling NtShutdownSystem.
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*/
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/*
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* @implemented
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*/
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BOOL WINAPI
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ExitWindowsEx(UINT uFlags,
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DWORD dwReserved)
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{
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NTSTATUS Status;
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USER_API_MESSAGE ApiMessage;
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ApiMessage.Data.ExitReactosRequest.Flags = uFlags;
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ApiMessage.Data.ExitReactosRequest.Reserved = dwReserved;
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Status = CsrClientCallServer((PCSR_API_MESSAGE)&ApiMessage,
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NULL,
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CSR_CREATE_API_NUMBER(USERSRV_SERVERDLL_INDEX, UserpExitWindowsEx),
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sizeof(USER_EXIT_REACTOS));
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if (!NT_SUCCESS(Status))
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{
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SetLastError(RtlNtStatusToDosError(Status));
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return FALSE;
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}
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return TRUE;
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}
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/*
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* @implemented
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*/
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BOOL WINAPI
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RegisterServicesProcess(DWORD ServicesProcessId)
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{
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NTSTATUS Status;
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USER_API_MESSAGE ApiMessage;
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ApiMessage.Data.RegisterServicesProcessRequest.ProcessId = ServicesProcessId;
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Status = CsrClientCallServer((PCSR_API_MESSAGE)&ApiMessage,
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NULL,
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CSR_CREATE_API_NUMBER(USERSRV_SERVERDLL_INDEX, UserpRegisterServicesProcess),
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sizeof(USER_REGISTER_SERVICES_PROCESS));
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if (!NT_SUCCESS(Status))
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{
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SetLastError(RtlNtStatusToDosError(Status));
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return FALSE;
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}
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return TRUE;
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}
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/* EOF */
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