| 1 | /* $Id: VBoxGuestR3LibLog.cpp 27083 2010-03-05 13:05:51Z 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 Sun Microsystems, Inc.
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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.alldomusa.eu.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 | * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa
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| 27 | * Clara, CA 95054 USA or visit http://www.sun.com if you need
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| 28 | * additional information or have any questions.
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| 29 | */
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| 30 |
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| 31 |
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| 32 | /*******************************************************************************
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| 33 | * Header Files *
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| 34 | *******************************************************************************/
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| 35 | #include <iprt/mem.h>
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| 36 | #include "VBGLR3Internal.h"
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| 37 |
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| 38 |
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| 39 | /**
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| 40 | * Write to the backdoor logger from ring 3 guest code.
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| 41 | *
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| 42 | * @returns IPRT status code.
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| 43 | *
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| 44 | * @param pch The string to log. Does not need to be terminated.
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| 45 | * @param cch The number of chars (bytes) to log.
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| 46 | *
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| 47 | * @remarks This currently does not accept more than 255 bytes of data at
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| 48 | * one time. It should probably be rewritten to use pass a pointer
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| 49 | * in the IOCtl.
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| 50 | */
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| 51 | VBGLR3DECL(int) VbglR3WriteLog(const char *pch, size_t cch)
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| 52 | {
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| 53 | /*
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| 54 | * Quietly skip NULL strings.
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| 55 | * (Happens in the RTLogBackdoorPrintf case.)
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| 56 | */
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| 57 | if (!cch)
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| 58 | return VINF_SUCCESS;
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| 59 | if (!VALID_PTR(pch))
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| 60 | return VERR_INVALID_POINTER;
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| 61 |
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| 62 | #ifdef RT_OS_WINDOWS
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| 63 | /*
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| 64 | * Duplicate the string as it may be read only (a C string).
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| 65 | */
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| 66 | void *pvTmp = RTMemDup(pch, cch);
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| 67 | if (!pvTmp)
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| 68 | return VERR_NO_MEMORY;
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| 69 | int rc = vbglR3DoIOCtl(VBOXGUEST_IOCTL_LOG(cch), pvTmp, cch);
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| 70 | RTMemFree(pvTmp);
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| 71 | return rc;
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| 72 |
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| 73 | #elif 0 /** @todo Several OSes could take this route (solaris and freebsd for instance). */
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| 74 | /*
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| 75 | * Handle the entire request in one go.
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| 76 | */
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| 77 | return vbglR3DoIOCtl(VBOXGUEST_IOCTL_LOG(cch), pvTmp, cch);
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| 78 |
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| 79 | #else
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| 80 | /*
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| 81 | * *BSD does not accept more than 4KB per ioctl request, while
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| 82 | * Linux can't express sizes above 8KB, so, split it up into 2KB chunks.
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| 83 | */
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| 84 | # define STEP 2048
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| 85 | int rc = VINF_SUCCESS;
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| 86 | for (size_t off = 0; off < cch && RT_SUCCESS(rc); off += STEP)
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| 87 | {
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| 88 | size_t cbStep = RT_MIN(cch - off, STEP);
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| 89 | rc = vbglR3DoIOCtl(VBOXGUEST_IOCTL_LOG(cbStep), (char *)pch + off, cbStep);
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| 90 | }
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| 91 | # undef STEP
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| 92 | return rc;
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| 93 | #endif
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| 94 | }
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| 95 |
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