1 | /* $Id: VBoxGuestR3LibLog.cpp 48938 2013-10-07 21:23:57Z 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) 2007-2010 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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