| 1 | /* $Id: VBoxGuestR3LibLog.cpp 62521 2016-07-22 19:16:33Z vboxsync $ */
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| 2 | /** @file
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| 3 | * VBoxGuestR3Lib - Ring-3 Support Library for VirtualBox guest additions, Logging.
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| 4 | */
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| 5 |
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| 6 | /*
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| 7 | * Copyright (C) 2007-2016 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 <iprt/mem.h>
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| 32 | #include "VBGLR3Internal.h"
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| 33 |
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| 34 |
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| 35 | /**
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| 36 | * Write to the backdoor logger from ring 3 guest code.
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| 37 | *
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| 38 | * @returns IPRT status code.
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| 39 | *
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| 40 | * @param pch The string to log. Does not need to be terminated.
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| 41 | * @param cch The number of chars (bytes) to log.
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| 42 | *
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| 43 | * @remarks This currently does not accept more than 255 bytes of data at
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| 44 | * one time. It should probably be rewritten to use pass a pointer
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| 45 | * in the IOCtl.
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| 46 | */
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| 47 | VBGLR3DECL(int) VbglR3WriteLog(const char *pch, size_t cch)
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| 48 | {
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| 49 | /*
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| 50 | * Quietly skip NULL strings.
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| 51 | * (Happens in the RTLogBackdoorPrintf case.)
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| 52 | */
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| 53 | if (!cch)
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| 54 | return VINF_SUCCESS;
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| 55 | if (!VALID_PTR(pch))
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| 56 | return VERR_INVALID_POINTER;
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| 57 |
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| 58 | #ifdef RT_OS_WINDOWS
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| 59 | /*
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| 60 | * Duplicate the string as it may be read only (a C string).
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| 61 | */
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| 62 | void *pvTmp = RTMemDup(pch, cch);
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| 63 | if (!pvTmp)
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| 64 | return VERR_NO_MEMORY;
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| 65 | int rc = vbglR3DoIOCtl(VBOXGUEST_IOCTL_LOG(cch), pvTmp, cch);
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| 66 | RTMemFree(pvTmp);
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| 67 | return rc;
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| 68 |
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| 69 | #elif 0 /** @todo Several OSes could take this route (solaris and freebsd for instance). */
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| 70 | /*
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| 71 | * Handle the entire request in one go.
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| 72 | */
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| 73 | return vbglR3DoIOCtl(VBOXGUEST_IOCTL_LOG(cch), pvTmp, cch);
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| 74 |
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| 75 | #else
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| 76 | /*
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| 77 | * *BSD does not accept more than 4KB per ioctl request, while
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| 78 | * Linux can't express sizes above 8KB, so, split it up into 2KB chunks.
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| 79 | */
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| 80 | # define STEP 2048
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| 81 | int rc = VINF_SUCCESS;
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| 82 | for (size_t off = 0; off < cch && RT_SUCCESS(rc); off += STEP)
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| 83 | {
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| 84 | size_t cbStep = RT_MIN(cch - off, STEP);
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| 85 | rc = vbglR3DoIOCtl(VBOXGUEST_IOCTL_LOG(cbStep), (char *)pch + off, cbStep);
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| 86 | }
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| 87 | # undef STEP
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| 88 | return rc;
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| 89 | #endif
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| 90 | }
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| 91 |
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