| 1 | /* $Id: VBoxGuestR3LibEvent.cpp 82968 2020-02-04 10:35:17Z vboxsync $ */
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| 2 | /** @file
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| 3 | * VBoxGuestR3Lib - Ring-3 Support Library for VirtualBox guest additions, Events.
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| 4 | */
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| 5 |
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| 6 | /*
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| 7 | * Copyright (C) 2007-2020 Oracle Corporation
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| 8 | *
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| 9 | * This file is part of VirtualBox Open Source Edition (OSE), as
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| 10 | * available from http://www.virtualbox.org. This file is free software;
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| 11 | * you can redistribute it and/or modify it under the terms of the GNU
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| 12 | * General Public License (GPL) as published by the Free Software
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| 13 | * Foundation, in version 2 as it comes in the "COPYING" file of the
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| 14 | * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
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| 15 | * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
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| 16 | *
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| 17 | * The contents of this file may alternatively be used under the terms
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| 18 | * of the Common Development and Distribution License Version 1.0
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| 19 | * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
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| 20 | * VirtualBox OSE distribution, in which case the provisions of the
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| 21 | * CDDL are applicable instead of those of the GPL.
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| 22 | *
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| 23 | * You may elect to license modified versions of this file under the
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| 24 | * terms and conditions of either the GPL or the CDDL or both.
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| 25 | */
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| 26 |
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| 27 |
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| 28 | /*********************************************************************************************************************************
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| 29 | * Header Files *
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| 30 | *********************************************************************************************************************************/
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| 31 | #include <VBox/log.h>
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| 32 | #include <iprt/assert.h>
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| 33 | #include "VBoxGuestR3LibInternal.h"
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| 34 |
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| 35 |
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| 36 | /**
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| 37 | * Wait for the host to signal one or more events and return which.
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| 38 | *
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| 39 | * The events will only be delivered by the host if they have been enabled
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| 40 | * previously using @a VbglR3CtlFilterMask. If one or several of the events
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| 41 | * have already been signalled but not yet waited for, this function will return
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| 42 | * immediately and return those events.
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| 43 | *
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| 44 | * @returns IPRT status code.
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| 45 | *
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| 46 | * @param fMask The events we want to wait for, or-ed together.
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| 47 | * @param cMillies How long to wait before giving up and returning
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| 48 | * (VERR_TIMEOUT). Use RT_INDEFINITE_WAIT to wait until we
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| 49 | * are interrupted or one of the events is signalled.
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| 50 | * @param pfEvents Where to store the events signalled. Optional.
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| 51 | */
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| 52 | VBGLR3DECL(int) VbglR3WaitEvent(uint32_t fMask, uint32_t cMillies, uint32_t *pfEvents)
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| 53 | {
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| 54 | LogFlow(("VbglR3WaitEvent: fMask=%#x, cMillies=%u, pfEvents=%p\n", fMask, cMillies, pfEvents));
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| 55 | AssertReturn((fMask & ~VMMDEV_EVENT_VALID_EVENT_MASK) == 0, VERR_INVALID_PARAMETER);
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| 56 | AssertPtrNullReturn(pfEvents, VERR_INVALID_POINTER);
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| 57 |
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| 58 | VBGLIOCWAITFOREVENTS WaitEvents;
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| 59 | VBGLREQHDR_INIT(&WaitEvents.Hdr, WAIT_FOR_EVENTS);
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| 60 | WaitEvents.u.In.fEvents = fMask;
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| 61 | WaitEvents.u.In.cMsTimeOut = cMillies;
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| 62 | int rc = vbglR3DoIOCtl(VBGL_IOCTL_WAIT_FOR_EVENTS, &WaitEvents.Hdr, sizeof(WaitEvents));
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| 63 | if (pfEvents)
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| 64 | {
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| 65 | if (RT_SUCCESS(rc))
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| 66 | *pfEvents = WaitEvents.u.Out.fEvents;
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| 67 | else
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| 68 | *pfEvents = 0;
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| 69 | }
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| 70 |
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| 71 | LogFlow(("VbglR3WaitEvent: rc=%Rrc fEvents=%#x\n", rc, WaitEvents.u.Out.fEvents));
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| 72 | return rc;
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| 73 | }
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| 74 |
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| 75 |
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| 76 | /**
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| 77 | * Causes any pending VbglR3WaitEvent calls (VBGL_IOCTL_WAIT_FOR_EVENTS) to
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| 78 | * return with a VERR_INTERRUPTED status.
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| 79 | *
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| 80 | * Can be used in combination with a termination flag variable for interrupting
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| 81 | * event loops. After calling this, VBGL_IOCTL_WAIT_FOR_EVENTS should no longer
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| 82 | * be called in the same session. At the time of writing this is not enforced;
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| 83 | * at the time of reading it may be.
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| 84 | *
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| 85 | * @returns IPRT status code.
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| 86 | */
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| 87 | VBGLR3DECL(int) VbglR3InterruptEventWaits(void)
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| 88 | {
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| 89 | VBGLREQHDR Req;
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| 90 | VBGLREQHDR_INIT(&Req, INTERRUPT_ALL_WAIT_FOR_EVENTS);
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| 91 | return vbglR3DoIOCtl(VBGL_IOCTL_INTERRUPT_ALL_WAIT_FOR_EVENTS, &Req, sizeof(Req));
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| 92 | }
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| 93 |
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