Adding upstream version 6.0.4-dfsg.upstream/6.0.4-dfsgupstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 731 insertions, 0 deletions

diff --git a/src/VBox/Runtime/r3/posix/pipe-posix.cpp b/src/VBox/Runtime/r3/posix/pipe-posix.cpp
new file mode 100644
index 00000000..d8189f84
--- /dev/null
+++ b/src/VBox/Runtime/r3/posix/pipe-posix.cpp
@@ -0,0 +1,731 @@
+/* $Id: pipe-posix.cpp $ */
+/** @file
+ * IPRT - Anonymous Pipes, POSIX Implementation.
+ */
+
+/*
+ * Copyright (C) 2010-2019 Oracle Corporation
+ *
+ * This file is part of VirtualBox Open Source Edition (OSE), as
+ * available from http://www.virtualbox.org. This file is free software;
+ * you can redistribute it and/or modify it under the terms of the GNU
+ * General Public License (GPL) as published by the Free Software
+ * Foundation, in version 2 as it comes in the "COPYING" file of the
+ * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
+ * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
+ *
+ * The contents of this file may alternatively be used under the terms
+ * of the Common Development and Distribution License Version 1.0
+ * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
+ * VirtualBox OSE distribution, in which case the provisions of the
+ * CDDL are applicable instead of those of the GPL.
+ *
+ * You may elect to license modified versions of this file under the
+ * terms and conditions of either the GPL or the CDDL or both.
+ */
+
+
+/*********************************************************************************************************************************
+*   Header Files                                                                                                                 *
+*********************************************************************************************************************************/
+#include <iprt/pipe.h>
+#include "internal/iprt.h"
+
+#include <iprt/asm.h>
+#include <iprt/assert.h>
+#include <iprt/err.h>
+#include <iprt/mem.h>
+#include <iprt/poll.h>
+#include <iprt/string.h>
+#include <iprt/thread.h>
+#include "internal/magics.h"
+
+#include <errno.h>
+#include <fcntl.h>
+#include <limits.h>
+#include <unistd.h>
+#include <sys/ioctl.h>
+#include <sys/poll.h>
+#include <sys/stat.h>
+#include <signal.h>
+#ifdef RT_OS_LINUX
+# include <sys/syscall.h>
+#endif
+#ifdef RT_OS_SOLARIS
+# include <sys/filio.h>
+#endif
+
+#include "internal/pipe.h"
+
+
+/*********************************************************************************************************************************
+*   Structures and Typedefs                                                                                                      *
+*********************************************************************************************************************************/
+typedef struct RTPIPEINTERNAL
+{
+    /** Magic value (RTPIPE_MAGIC). */
+    uint32_t            u32Magic;
+    /** The file descriptor. */
+    int                 fd;
+    /** Set if this is the read end, clear if it's the write end. */
+    bool                fRead;
+    /** Atomically operated state variable.
+     *
+     *  - Bits 0 thru 29 - Users of the new mode.
+     *  - Bit 30 - The pipe mode, set indicates blocking.
+     *  - Bit 31 - Set when we're switching the mode.
+     */
+    uint32_t volatile   u32State;
+} RTPIPEINTERNAL;
+
+
+/*********************************************************************************************************************************
+*   Defined Constants And Macros                                                                                                 *
+*********************************************************************************************************************************/
+/** @name RTPIPEINTERNAL::u32State defines
+ * @{ */
+#define RTPIPE_POSIX_BLOCKING           UINT32_C(0x40000000)
+#define RTPIPE_POSIX_SWITCHING          UINT32_C(0x80000000)
+#define RTPIPE_POSIX_SWITCHING_BIT      31
+#define RTPIPE_POSIX_USERS_MASK         UINT32_C(0x3fffffff)
+/** @} */
+
+
+
+/**
+ * Wrapper for calling pipe2() or pipe().
+ *
+ * When using pipe2() the returned handles are marked close-on-exec and does
+ * not risk racing process creation calls on other threads.
+ *
+ * @returns See pipe().
+ * @param   paFds               See pipe().
+ * @param   piNewPipeSyscall    Where to cache which call we should used. -1 if
+ *                              pipe(), 1 if pipe2(), 0 if not yet decided.
+ */
+static int my_pipe_wrapper(int *paFds, int *piNewPipeSyscall)
+{
+    if (*piNewPipeSyscall >= 0)
+    {
+#if defined(RT_OS_LINUX) && defined(__NR_pipe2) && defined(O_CLOEXEC)
+        long rc = syscall(__NR_pipe2, paFds, O_CLOEXEC);
+        if (rc >= 0)
+        {
+            if (*piNewPipeSyscall == 0)
+                *piNewPipeSyscall = 1;
+            return (int)rc;
+        }
+#endif
+        *piNewPipeSyscall = -1;
+    }
+
+    return pipe(paFds);
+}
+
+
+RTDECL(int)  RTPipeCreate(PRTPIPE phPipeRead, PRTPIPE phPipeWrite, uint32_t fFlags)
+{
+    AssertPtrReturn(phPipeRead, VERR_INVALID_POINTER);
+    AssertPtrReturn(phPipeWrite, VERR_INVALID_POINTER);
+    AssertReturn(!(fFlags & ~RTPIPE_C_VALID_MASK), VERR_INVALID_PARAMETER);
+
+    /*
+     * Create the pipe and clear/set the close-on-exec flag as required.
+     */
+    int aFds[2] = {-1, -1};
+    static int s_iNewPipeSyscall = 0;
+    if (my_pipe_wrapper(aFds, &s_iNewPipeSyscall))
+        return RTErrConvertFromErrno(errno);
+
+    int rc = VINF_SUCCESS;
+    if (s_iNewPipeSyscall > 0)
+    {
+        /* created with close-on-exec set. */
+        if (fFlags & RTPIPE_C_INHERIT_READ)
+        {
+            if (fcntl(aFds[0], F_SETFD, 0))
+                rc = RTErrConvertFromErrno(errno);
+        }
+
+        if (fFlags & RTPIPE_C_INHERIT_WRITE)
+        {
+            if (fcntl(aFds[1], F_SETFD, 0))
+                rc = RTErrConvertFromErrno(errno);
+        }
+    }
+    else
+    {
+        /* created with close-on-exec cleared. */
+        if (!(fFlags & RTPIPE_C_INHERIT_READ))
+        {
+            if (fcntl(aFds[0], F_SETFD, FD_CLOEXEC))
+                rc = RTErrConvertFromErrno(errno);
+        }
+
+        if (!(fFlags & RTPIPE_C_INHERIT_WRITE))
+        {
+            if (fcntl(aFds[1], F_SETFD, FD_CLOEXEC))
+                rc = RTErrConvertFromErrno(errno);
+        }
+    }
+
+    if (RT_SUCCESS(rc))
+    {
+        /*
+         * Create the two handles.
+         */
+        RTPIPEINTERNAL *pThisR = (RTPIPEINTERNAL *)RTMemAlloc(sizeof(RTPIPEINTERNAL));
+        if (pThisR)
+        {
+            RTPIPEINTERNAL *pThisW = (RTPIPEINTERNAL *)RTMemAlloc(sizeof(RTPIPEINTERNAL));
+            if (pThisW)
+            {
+                pThisR->u32Magic = RTPIPE_MAGIC;
+                pThisW->u32Magic = RTPIPE_MAGIC;
+                pThisR->fd       = aFds[0];
+                pThisW->fd       = aFds[1];
+                pThisR->fRead    = true;
+                pThisW->fRead    = false;
+                pThisR->u32State = RTPIPE_POSIX_BLOCKING;
+                pThisW->u32State = RTPIPE_POSIX_BLOCKING;
+
+                *phPipeRead  = pThisR;
+                *phPipeWrite = pThisW;
+
+                /*
+                 * Before we leave, make sure to shut up SIGPIPE.
+                 */
+                signal(SIGPIPE, SIG_IGN);
+                return VINF_SUCCESS;
+            }
+
+            RTMemFree(pThisR);
+            rc = VERR_NO_MEMORY;
+        }
+        else
+            rc = VERR_NO_MEMORY;
+    }
+
+    close(aFds[0]);
+    close(aFds[1]);
+    return rc;
+}
+
+
+RTDECL(int)  RTPipeClose(RTPIPE hPipe)
+{
+    RTPIPEINTERNAL *pThis = hPipe;
+    if (pThis == NIL_RTPIPE)
+        return VINF_SUCCESS;
+    AssertPtrReturn(pThis, VERR_INVALID_PARAMETER);
+    AssertReturn(pThis->u32Magic == RTPIPE_MAGIC, VERR_INVALID_HANDLE);
+
+    /*
+     * Do the cleanup.
+     */
+    AssertReturn(ASMAtomicCmpXchgU32(&pThis->u32Magic, ~RTPIPE_MAGIC, RTPIPE_MAGIC), VERR_INVALID_HANDLE);
+
+    int fd = pThis->fd;
+    pThis->fd = -1;
+    close(fd);
+
+    if (ASMAtomicReadU32(&pThis->u32State) & RTPIPE_POSIX_USERS_MASK)
+    {
+        AssertFailed();
+        RTThreadSleep(1);
+    }
+
+    RTMemFree(pThis);
+
+    return VINF_SUCCESS;
+}
+
+RTDECL(int)  RTPipeFromNative(PRTPIPE phPipe, RTHCINTPTR hNativePipe, uint32_t fFlags)
+{
+    AssertPtrReturn(phPipe, VERR_INVALID_POINTER);
+    AssertReturn(!(fFlags & ~RTPIPE_N_VALID_MASK), VERR_INVALID_PARAMETER);
+    AssertReturn(!!(fFlags & RTPIPE_N_READ) != !!(fFlags & RTPIPE_N_WRITE), VERR_INVALID_PARAMETER);
+
+    /*
+     * Get and validate the pipe handle info.
+     */
+    int hNative = (int)hNativePipe;
+    struct stat st;
+    AssertReturn(fstat(hNative, &st) == 0, RTErrConvertFromErrno(errno));
+    AssertMsgReturn(S_ISFIFO(st.st_mode) || S_ISSOCK(st.st_mode), ("%#x (%o)\n", st.st_mode, st.st_mode), VERR_INVALID_HANDLE);
+
+    int fFd = fcntl(hNative, F_GETFL, 0);
+    AssertReturn(fFd != -1, VERR_INVALID_HANDLE);
+    AssertMsgReturn(   (fFd & O_ACCMODE) == (fFlags & RTPIPE_N_READ ? O_RDONLY : O_WRONLY)
+                    || (fFd & O_ACCMODE) == O_RDWR /* Solaris creates bi-directional pipes. */
+                    , ("%#x\n", fFd), VERR_INVALID_HANDLE);
+
+    /*
+     * Create the handle.
+     */
+    RTPIPEINTERNAL *pThis = (RTPIPEINTERNAL *)RTMemAlloc(sizeof(RTPIPEINTERNAL));
+    if (!pThis)
+        return VERR_NO_MEMORY;
+
+    pThis->u32Magic = RTPIPE_MAGIC;
+    pThis->fd       = hNative;
+    pThis->fRead    = !!(fFlags & RTPIPE_N_READ);
+    pThis->u32State = fFd & O_NONBLOCK ? 0 : RTPIPE_POSIX_BLOCKING;
+
+    /*
+     * Fix up inheritability and shut up SIGPIPE and we're done.
+     */
+    if (fcntl(hNative, F_SETFD, fFlags & RTPIPE_N_INHERIT ? 0 : FD_CLOEXEC) == 0)
+    {
+        signal(SIGPIPE, SIG_IGN);
+        *phPipe = pThis;
+        return VINF_SUCCESS;
+    }
+
+    int rc = RTErrConvertFromErrno(errno);
+    RTMemFree(pThis);
+    return rc;
+}
+
+
+RTDECL(RTHCINTPTR) RTPipeToNative(RTPIPE hPipe)
+{
+    RTPIPEINTERNAL *pThis = hPipe;
+    AssertPtrReturn(pThis, -1);
+    AssertReturn(pThis->u32Magic == RTPIPE_MAGIC, -1);
+
+    return pThis->fd;
+}
+
+
+/**
+ * Prepare blocking mode.
+ *
+ * @returns VINF_SUCCESS
+ * @retval  VERR_WRONG_ORDER
+ * @retval  VERR_INTERNAL_ERROR_4
+ *
+ * @param   pThis               The pipe handle.
+ */
+static int rtPipeTryBlocking(RTPIPEINTERNAL *pThis)
+{
+    /*
+     * Update the state.
+     */
+    for (;;)
+    {
+        uint32_t        u32State    = ASMAtomicReadU32(&pThis->u32State);
+        uint32_t const  u32StateOld = u32State;
+        uint32_t const  cUsers      = (u32State & RTPIPE_POSIX_USERS_MASK);
+
+        if (u32State & RTPIPE_POSIX_BLOCKING)
+        {
+            AssertReturn(cUsers < RTPIPE_POSIX_USERS_MASK / 2, VERR_INTERNAL_ERROR_4);
+            u32State &= ~RTPIPE_POSIX_USERS_MASK;
+            u32State |= cUsers + 1;
+            if (ASMAtomicCmpXchgU32(&pThis->u32State, u32State, u32StateOld))
+            {
+                if (u32State & RTPIPE_POSIX_SWITCHING)
+                    break;
+                return VINF_SUCCESS;
+            }
+        }
+        else if (cUsers == 0)
+        {
+            u32State = 1 | RTPIPE_POSIX_SWITCHING | RTPIPE_POSIX_BLOCKING;
+            if (ASMAtomicCmpXchgU32(&pThis->u32State, u32State, u32StateOld))
+                break;
+        }
+        else
+            return VERR_WRONG_ORDER;
+        ASMNopPause();
+    }
+
+    /*
+     * Do the switching.
+     */
+    int fFlags = fcntl(pThis->fd, F_GETFL, 0);
+    if (fFlags != -1)
+    {
+        if (    !(fFlags & O_NONBLOCK)
+            ||  fcntl(pThis->fd, F_SETFL, fFlags & ~O_NONBLOCK) != -1)
+        {
+            ASMAtomicBitClear(&pThis->u32State, RTPIPE_POSIX_SWITCHING_BIT);
+            return VINF_SUCCESS;
+        }
+    }
+
+    ASMAtomicDecU32(&pThis->u32State);
+    return RTErrConvertFromErrno(errno);
+}
+
+
+/**
+ * Prepare non-blocking mode.
+ *
+ * @returns VINF_SUCCESS
+ * @retval  VERR_WRONG_ORDER
+ * @retval  VERR_INTERNAL_ERROR_4
+ *
+ * @param   pThis               The pipe handle.
+ */
+static int rtPipeTryNonBlocking(RTPIPEINTERNAL *pThis)
+{
+    /*
+     * Update the state.
+     */
+    for (;;)
+    {
+        uint32_t        u32State    = ASMAtomicReadU32(&pThis->u32State);
+        uint32_t const  u32StateOld = u32State;
+        uint32_t const  cUsers      = (u32State & RTPIPE_POSIX_USERS_MASK);
+
+        if (!(u32State & RTPIPE_POSIX_BLOCKING))
+        {
+            AssertReturn(cUsers < RTPIPE_POSIX_USERS_MASK / 2, VERR_INTERNAL_ERROR_4);
+            u32State &= ~RTPIPE_POSIX_USERS_MASK;
+            u32State |= cUsers + 1;
+            if (ASMAtomicCmpXchgU32(&pThis->u32State, u32State, u32StateOld))
+            {
+                if (u32State & RTPIPE_POSIX_SWITCHING)
+                    break;
+                return VINF_SUCCESS;
+            }
+        }
+        else if (cUsers == 0)
+        {
+            u32State = 1 | RTPIPE_POSIX_SWITCHING;
+            if (ASMAtomicCmpXchgU32(&pThis->u32State, u32State, u32StateOld))
+                break;
+        }
+        else
+            return VERR_WRONG_ORDER;
+        ASMNopPause();
+    }
+
+    /*
+     * Do the switching.
+     */
+    int fFlags = fcntl(pThis->fd, F_GETFL, 0);
+    if (fFlags != -1)
+    {
+        if (    (fFlags & O_NONBLOCK)
+            ||  fcntl(pThis->fd, F_SETFL, fFlags | O_NONBLOCK) != -1)
+        {
+            ASMAtomicBitClear(&pThis->u32State, RTPIPE_POSIX_SWITCHING_BIT);
+            return VINF_SUCCESS;
+        }
+    }
+
+    ASMAtomicDecU32(&pThis->u32State);
+    return RTErrConvertFromErrno(errno);
+}
+
+
+/**
+ * Checks if the read pipe has a HUP condition.
+ *
+ * @returns true if HUP, false if no.
+ * @param   pThis               The pipe handle (read).
+ */
+static bool rtPipePosixHasHup(RTPIPEINTERNAL *pThis)
+{
+    Assert(pThis->fRead);
+
+    struct pollfd PollFd;
+    RT_ZERO(PollFd);
+    PollFd.fd      = pThis->fd;
+    PollFd.events  = POLLHUP;
+    return poll(&PollFd, 1, 0) >= 1
+       && (PollFd.revents & POLLHUP);
+}
+
+
+RTDECL(int) RTPipeRead(RTPIPE hPipe, void *pvBuf, size_t cbToRead, size_t *pcbRead)
+{
+    RTPIPEINTERNAL *pThis = hPipe;
+    AssertPtrReturn(pThis, VERR_INVALID_HANDLE);
+    AssertReturn(pThis->u32Magic == RTPIPE_MAGIC, VERR_INVALID_HANDLE);
+    AssertReturn(pThis->fRead, VERR_ACCESS_DENIED);
+    AssertPtr(pcbRead);
+    AssertPtr(pvBuf);
+
+    int rc = rtPipeTryNonBlocking(pThis);
+    if (RT_SUCCESS(rc))
+    {
+        ssize_t cbRead = read(pThis->fd, pvBuf, RT_MIN(cbToRead, SSIZE_MAX));
+        if (cbRead >= 0)
+        {
+            if (cbRead || !cbToRead || !rtPipePosixHasHup(pThis))
+                *pcbRead = cbRead;
+            else
+                rc = VERR_BROKEN_PIPE;
+        }
+        else if (errno == EAGAIN)
+        {
+            *pcbRead = 0;
+            rc = VINF_TRY_AGAIN;
+        }
+        else
+            rc = RTErrConvertFromErrno(errno);
+
+        ASMAtomicDecU32(&pThis->u32State);
+    }
+    return rc;
+}
+
+
+RTDECL(int) RTPipeReadBlocking(RTPIPE hPipe, void *pvBuf, size_t cbToRead, size_t *pcbRead)
+{
+    RTPIPEINTERNAL *pThis = hPipe;
+    AssertPtrReturn(pThis, VERR_INVALID_HANDLE);
+    AssertReturn(pThis->u32Magic == RTPIPE_MAGIC, VERR_INVALID_HANDLE);
+    AssertReturn(pThis->fRead, VERR_ACCESS_DENIED);
+    AssertPtr(pvBuf);
+
+    int rc = rtPipeTryBlocking(pThis);
+    if (RT_SUCCESS(rc))
+    {
+        size_t cbTotalRead = 0;
+        while (cbToRead > 0)
+        {
+            ssize_t cbRead = read(pThis->fd, pvBuf, RT_MIN(cbToRead, SSIZE_MAX));
+            if (cbRead < 0)
+            {
+                rc = RTErrConvertFromErrno(errno);
+                break;
+            }
+            if (!cbRead && rtPipePosixHasHup(pThis))
+            {
+                rc = VERR_BROKEN_PIPE;
+                break;
+            }
+
+            /* advance */
+            pvBuf        = (char *)pvBuf + cbRead;
+            cbTotalRead += cbRead;
+            cbToRead    -= cbRead;
+        }
+
+        if (pcbRead)
+        {
+            *pcbRead = cbTotalRead;
+            if (   RT_FAILURE(rc)
+                && cbTotalRead
+                && rc != VERR_INVALID_POINTER)
+                rc = VINF_SUCCESS;
+        }
+
+        ASMAtomicDecU32(&pThis->u32State);
+    }
+    return rc;
+}
+
+
+RTDECL(int) RTPipeWrite(RTPIPE hPipe, const void *pvBuf, size_t cbToWrite, size_t *pcbWritten)
+{
+    RTPIPEINTERNAL *pThis = hPipe;
+    AssertPtrReturn(pThis, VERR_INVALID_HANDLE);
+    AssertReturn(pThis->u32Magic == RTPIPE_MAGIC, VERR_INVALID_HANDLE);
+    AssertReturn(!pThis->fRead, VERR_ACCESS_DENIED);
+    AssertPtr(pcbWritten);
+    AssertPtr(pvBuf);
+
+    int rc = rtPipeTryNonBlocking(pThis);
+    if (RT_SUCCESS(rc))
+    {
+        if (cbToWrite)
+        {
+            ssize_t cbWritten = write(pThis->fd, pvBuf, RT_MIN(cbToWrite, SSIZE_MAX));
+            if (cbWritten >= 0)
+                *pcbWritten = cbWritten;
+            else if (errno == EAGAIN)
+            {
+                *pcbWritten = 0;
+                rc = VINF_TRY_AGAIN;
+            }
+            else
+                rc = RTErrConvertFromErrno(errno);
+        }
+        else
+            *pcbWritten = 0;
+
+        ASMAtomicDecU32(&pThis->u32State);
+    }
+    return rc;
+}
+
+
+RTDECL(int) RTPipeWriteBlocking(RTPIPE hPipe, const void *pvBuf, size_t cbToWrite, size_t *pcbWritten)
+{
+    RTPIPEINTERNAL *pThis = hPipe;
+    AssertPtrReturn(pThis, VERR_INVALID_HANDLE);
+    AssertReturn(pThis->u32Magic == RTPIPE_MAGIC, VERR_INVALID_HANDLE);
+    AssertReturn(!pThis->fRead, VERR_ACCESS_DENIED);
+    AssertPtr(pvBuf);
+    AssertPtrNull(pcbWritten);
+
+    int rc = rtPipeTryBlocking(pThis);
+    if (RT_SUCCESS(rc))
+    {
+        size_t cbTotalWritten = 0;
+        while (cbToWrite > 0)
+        {
+            ssize_t cbWritten = write(pThis->fd, pvBuf, RT_MIN(cbToWrite, SSIZE_MAX));
+            if (cbWritten < 0)
+            {
+                rc = RTErrConvertFromErrno(errno);
+                break;
+            }
+
+            /* advance */
+            pvBuf           = (char const *)pvBuf + cbWritten;
+            cbTotalWritten += cbWritten;
+            cbToWrite      -= cbWritten;
+        }
+
+        if (pcbWritten)
+        {
+            *pcbWritten = cbTotalWritten;
+            if (   RT_FAILURE(rc)
+                && cbTotalWritten
+                && rc != VERR_INVALID_POINTER)
+                rc = VINF_SUCCESS;
+        }
+
+        ASMAtomicDecU32(&pThis->u32State);
+    }
+    return rc;
+}
+
+
+RTDECL(int) RTPipeFlush(RTPIPE hPipe)
+{
+    RTPIPEINTERNAL *pThis = hPipe;
+    AssertPtrReturn(pThis, VERR_INVALID_HANDLE);
+    AssertReturn(pThis->u32Magic == RTPIPE_MAGIC, VERR_INVALID_HANDLE);
+    AssertReturn(!pThis->fRead, VERR_ACCESS_DENIED);
+
+    if (fsync(pThis->fd))
+    {
+        if (errno == EINVAL || errno == ENOTSUP)
+            return VERR_NOT_SUPPORTED;
+        return RTErrConvertFromErrno(errno);
+    }
+    return VINF_SUCCESS;
+}
+
+
+RTDECL(int) RTPipeSelectOne(RTPIPE hPipe, RTMSINTERVAL cMillies)
+{
+    RTPIPEINTERNAL *pThis = hPipe;
+    AssertPtrReturn(pThis, VERR_INVALID_HANDLE);
+    AssertReturn(pThis->u32Magic == RTPIPE_MAGIC, VERR_INVALID_HANDLE);
+
+    struct pollfd PollFd;
+    RT_ZERO(PollFd);
+    PollFd.fd      = pThis->fd;
+    PollFd.events  = POLLHUP | POLLERR;
+    if (pThis->fRead)
+        PollFd.events |= POLLIN | POLLPRI;
+    else
+        PollFd.events |= POLLOUT;
+
+    int timeout;
+    if (   cMillies == RT_INDEFINITE_WAIT
+        || cMillies >= INT_MAX /* lazy bird */)
+        timeout = -1;
+    else
+        timeout = cMillies;
+
+    int rc = poll(&PollFd, 1, timeout);
+    if (rc == -1)
+        return RTErrConvertFromErrno(errno);
+    return rc > 0 ? VINF_SUCCESS : VERR_TIMEOUT;
+}
+
+
+RTDECL(int) RTPipeQueryReadable(RTPIPE hPipe, size_t *pcbReadable)
+{
+    RTPIPEINTERNAL *pThis = hPipe;
+    AssertPtrReturn(pThis, VERR_INVALID_HANDLE);
+    AssertReturn(pThis->u32Magic == RTPIPE_MAGIC, VERR_INVALID_HANDLE);
+    AssertReturn(pThis->fRead, VERR_PIPE_NOT_READ);
+    AssertPtrReturn(pcbReadable, VERR_INVALID_POINTER);
+
+    int cb = 0;
+    int rc = ioctl(pThis->fd, FIONREAD, &cb);
+    if (rc != -1)
+    {
+        AssertStmt(cb >= 0, cb = 0);
+        *pcbReadable = cb;
+        return VINF_SUCCESS;
+    }
+
+    rc = errno;
+    if (rc == ENOTTY)
+        rc = VERR_NOT_SUPPORTED;
+    else
+        rc = RTErrConvertFromErrno(rc);
+    return rc;
+}
+
+
+RTDECL(int) RTPipeQueryInfo(RTPIPE hPipe, PRTFSOBJINFO pObjInfo, RTFSOBJATTRADD enmAddAttr)
+{
+    RTPIPEINTERNAL *pThis = hPipe;
+    AssertPtrReturn(pThis, 0);
+    AssertReturn(pThis->u32Magic == RTPIPE_MAGIC, 0);
+
+    rtPipeFakeQueryInfo(pObjInfo, enmAddAttr, pThis->fRead);
+
+    if (pThis->fRead)
+    {
+        int cb = 0;
+        int rc = ioctl(pThis->fd, FIONREAD, &cb);
+        if (rc >= 0)
+            pObjInfo->cbObject = cb;
+    }
+#ifdef FIONSPACE
+    else
+    {
+        int cb = 0;
+        int rc = ioctl(pThis->fd, FIONSPACE, &cb);
+        if (rc >= 0)
+            pObjInfo->cbObject = cb;
+    }
+#endif
+
+    /** @todo Check this out on linux, solaris and darwin... (Currently going by a
+     *        FreeBSD manpage.) */
+    struct stat St;
+    if (fstat(pThis->fd, &St))
+    {
+        pObjInfo->cbAllocated = St.st_blksize;
+        if (   enmAddAttr == RTFSOBJATTRADD_NOTHING
+            || enmAddAttr == RTFSOBJATTRADD_UNIX)
+        {
+            pObjInfo->Attr.enmAdditional = RTFSOBJATTRADD_UNIX;
+            pObjInfo->Attr.u.Unix.INodeId       = St.st_ino;
+            pObjInfo->Attr.u.Unix.INodeIdDevice = St.st_dev;
+        }
+    }
+    /** @todo error handling?  */
+
+    return VINF_SUCCESS;
+}
+
+
+int rtPipePollGetHandle(RTPIPE hPipe, uint32_t fEvents, PRTHCINTPTR phNative)
+{
+    RTPIPEINTERNAL *pThis = hPipe;
+    AssertPtrReturn(pThis, VERR_INVALID_HANDLE);
+    AssertReturn(pThis->u32Magic == RTPIPE_MAGIC, VERR_INVALID_HANDLE);
+
+    AssertReturn(!(fEvents & RTPOLL_EVT_READ)  || pThis->fRead,  VERR_INVALID_PARAMETER);
+    AssertReturn(!(fEvents & RTPOLL_EVT_WRITE) || !pThis->fRead, VERR_INVALID_PARAMETER);
+
+    *phNative = pThis->fd;
+    return VINF_SUCCESS;
+}
+