| 1 | /** @file
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| 2 | *
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| 3 | * Guest client: display auto-resize.
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| 4 | */
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| 5 |
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| 6 | /*
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| 7 | * Copyright (C) 2006-2007 innotek GmbH
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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 |
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| 18 | #include <VBox/VBoxGuest.h>
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| 19 | #include <iprt/assert.h>
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| 20 |
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| 21 | /** @todo this should probably be replaced by something IPRT */
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| 22 | /* For system() and WEXITSTATUS() */
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| 23 | #include <stdlib.h>
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| 24 | #include <sys/types.h>
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| 25 | #include <sys/wait.h>
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| 26 | #include <errno.h>
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| 27 |
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| 28 | #include "displaychange.h"
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| 29 |
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| 30 | int VBoxGuestDisplayChangeThreadX11::init(void)
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| 31 | {
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| 32 | int rc, rcSystem, rcErrno;
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| 33 |
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| 34 | rcSystem = system("VBoxRandR --test");
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| 35 | if (-1 == rcSystem)
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| 36 | {
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| 37 | rcErrno = errno;
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| 38 | rc = RTErrConvertFromErrno(rcErrno);
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| 39 | }
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| 40 | if (RT_SUCCESS(rc))
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| 41 | {
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| 42 | if (0 != WEXITSTATUS(rcSystem))
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| 43 | rc = VERR_NOT_SUPPORTED;
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| 44 | }
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| 45 | if (RT_SUCCESS(rc))
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| 46 | rc = VbglR3CtlFilterMask(VMMDEV_EVENT_DISPLAY_CHANGE_REQUEST, 0);
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| 47 | if (RT_SUCCESS(rc))
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| 48 | mInit = true;
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| 49 | return rc;
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| 50 | }
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| 51 |
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| 52 | void VBoxGuestDisplayChangeThreadX11::uninit(void)
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| 53 | {
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| 54 | VbglR3CtlFilterMask(0, VMMDEV_EVENT_DISPLAY_CHANGE_REQUEST);
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| 55 | mInit = false;
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| 56 | }
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| 57 |
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| 58 | /**
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| 59 | * Display change request monitor thread function
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| 60 | */
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| 61 | int VBoxGuestDisplayChangeThreadX11::threadFunction(VBoxGuestThread *pThread)
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| 62 | {
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| 63 | mThread = pThread;
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| 64 | while (!mThread->isStopping())
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| 65 | {
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| 66 | uint32_t cx, cy, cBits, iDisplay;
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| 67 | int rc = VbglR3DisplayChangeWaitEvent(&cx, &cy, &cBits, &iDisplay);
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| 68 | /* If we are not stopping, sleep for a bit to avoid using up too
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| 69 | much CPU while retrying. */
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| 70 | if (RT_FAILURE(rc) && !mThread->isStopping())
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| 71 | mThread->yield();
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| 72 | else
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| 73 | system("VBoxRandR");
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| 74 | }
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| 75 | return VINF_SUCCESS;
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| 76 | }
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| 77 |
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| 78 | /**
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| 79 | * Send a signal to the thread function that it should exit
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| 80 | */
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| 81 | void VBoxGuestDisplayChangeThreadX11::stop(void)
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| 82 | {
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| 83 | /**
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| 84 | * @todo is this reasonable? If the thread is in the event loop then the cancelEvent()
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| 85 | * will cause it to exit. If it enters or exits the event loop it will also
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| 86 | * notice that we wish it to exit. And if it is somewhere in-between, the
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| 87 | * yield() should give it time to get to one of places mentioned above.
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| 88 | */
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| 89 | for (int i = 0; (i < 5) && mThread->isRunning(); ++i)
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| 90 | {
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| 91 | VbglR3InterruptEventWaits();;
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| 92 | mThread->yield();
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| 93 | }
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| 94 | }
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| 95 |
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| 96 | int VBoxGuestDisplayChangeMonitor::init(void)
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| 97 | {
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| 98 | int rc = VINF_SUCCESS;
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| 99 |
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| 100 | if (mInit)
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| 101 | return VINF_SUCCESS;
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| 102 | rc = mThreadFunction.init();
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| 103 | if (RT_FAILURE(rc))
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| 104 | Log(("VBoxClient: failed to initialise the display change thread, rc=%Rrc (VBoxGuestDisplayChangeMonitor::init)\n", rc));
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| 105 | if (RT_SUCCESS(rc))
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| 106 | {
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| 107 | rc = mThread.start();
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| 108 | if (RT_FAILURE(rc))
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| 109 | Log(("VBoxClient: failed to start the display change thread, rc=%Rrc (VBoxGuestDisplayChangeMonitor::init)\n", rc));
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| 110 | }
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| 111 | if (RT_SUCCESS(rc))
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| 112 | mInit = true;
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| 113 | return rc;
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| 114 | }
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| 115 |
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| 116 | void VBoxGuestDisplayChangeMonitor::uninit(unsigned cMillies /* = RT_INDEFINITE_WAIT */)
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| 117 | {
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| 118 | if (mInit)
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| 119 | {
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| 120 | if (mThread.stop(cMillies, 0))
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| 121 | mThreadFunction.uninit();
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| 122 | }
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| 123 | }
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