pipe-posix.cpp revision b41f65ee355ae1d4b24473c6d6d70c653497429a
637712559132d2b3617aea0103fb0385978da14evboxsync/* $Id$ */
637712559132d2b3617aea0103fb0385978da14evboxsync/** @file
637712559132d2b3617aea0103fb0385978da14evboxsync * IPRT - Anonymouse Pipes, POSIX Implementation.
637712559132d2b3617aea0103fb0385978da14evboxsync */
637712559132d2b3617aea0103fb0385978da14evboxsync
637712559132d2b3617aea0103fb0385978da14evboxsync/*
637712559132d2b3617aea0103fb0385978da14evboxsync * Copyright (C) 2010 Sun Microsystems, Inc.
637712559132d2b3617aea0103fb0385978da14evboxsync *
637712559132d2b3617aea0103fb0385978da14evboxsync * This file is part of VirtualBox Open Source Edition (OSE), as
637712559132d2b3617aea0103fb0385978da14evboxsync * available from http://www.virtualbox.org. This file is free software;
637712559132d2b3617aea0103fb0385978da14evboxsync * you can redistribute it and/or modify it under the terms of the GNU
637712559132d2b3617aea0103fb0385978da14evboxsync * General Public License (GPL) as published by the Free Software
637712559132d2b3617aea0103fb0385978da14evboxsync * Foundation, in version 2 as it comes in the "COPYING" file of the
637712559132d2b3617aea0103fb0385978da14evboxsync * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
637712559132d2b3617aea0103fb0385978da14evboxsync * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
637712559132d2b3617aea0103fb0385978da14evboxsync *
637712559132d2b3617aea0103fb0385978da14evboxsync * The contents of this file may alternatively be used under the terms
637712559132d2b3617aea0103fb0385978da14evboxsync * of the Common Development and Distribution License Version 1.0
637712559132d2b3617aea0103fb0385978da14evboxsync * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
637712559132d2b3617aea0103fb0385978da14evboxsync * VirtualBox OSE distribution, in which case the provisions of the
637712559132d2b3617aea0103fb0385978da14evboxsync * CDDL are applicable instead of those of the GPL.
637712559132d2b3617aea0103fb0385978da14evboxsync *
637712559132d2b3617aea0103fb0385978da14evboxsync * You may elect to license modified versions of this file under the
637712559132d2b3617aea0103fb0385978da14evboxsync * terms and conditions of either the GPL or the CDDL or both.
637712559132d2b3617aea0103fb0385978da14evboxsync *
637712559132d2b3617aea0103fb0385978da14evboxsync * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa
637712559132d2b3617aea0103fb0385978da14evboxsync * Clara, CA 95054 USA or visit http://www.sun.com if you need
637712559132d2b3617aea0103fb0385978da14evboxsync * additional information or have any questions.
637712559132d2b3617aea0103fb0385978da14evboxsync */
637712559132d2b3617aea0103fb0385978da14evboxsync
637712559132d2b3617aea0103fb0385978da14evboxsync
637712559132d2b3617aea0103fb0385978da14evboxsync/*******************************************************************************
637712559132d2b3617aea0103fb0385978da14evboxsync* Header Files *
637712559132d2b3617aea0103fb0385978da14evboxsync*******************************************************************************/
637712559132d2b3617aea0103fb0385978da14evboxsync#include <iprt/pipe.h>
637712559132d2b3617aea0103fb0385978da14evboxsync#include "internal/iprt.h"
637712559132d2b3617aea0103fb0385978da14evboxsync
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync#include <iprt/asm.h>
637712559132d2b3617aea0103fb0385978da14evboxsync#include <iprt/assert.h>
637712559132d2b3617aea0103fb0385978da14evboxsync#include <iprt/err.h>
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync#include <iprt/mem.h>
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync#include <iprt/string.h>
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync#include <iprt/thread.h>
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync#include "internal/magics.h"
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync#include <errno.h>
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync#include <fcntl.h>
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync#include <limits.h>
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync#include <unistd.h>
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync#include <sys/poll.h>
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync#include <signal.h>
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync/*******************************************************************************
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync* Structures and Typedefs *
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync*******************************************************************************/
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsynctypedef struct RTPIPEINTERNAL
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync{
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync /** Magic value (RTPIPE_MAGIC). */
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync uint32_t u32Magic;
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync /** The file descriptor. */
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync int fd;
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync /** Set if this is the read end, clear if it's the write end. */
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync bool fRead;
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync /** Atomically operated state variable.
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync *
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync * - Bits 0 thru 29 - Users of the new mode.
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync * - Bit 30 - The pipe mode, set indicates blocking.
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync * - Bit 31 - Set when we're switching the mode.
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync */
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync uint32_t volatile u32State;
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync} RTPIPEINTERNAL;
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync/*******************************************************************************
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync* Defined Constants And Macros *
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync*******************************************************************************/
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync/** @name RTPIPEINTERNAL::u32State defines
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync * @{ */
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync#define RTPIPE_POSIX_BLOCKING UINT32_C(0x40000000)
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync#define RTPIPE_POSIX_SWITCHING UINT32_C(0x80000000)
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync#define RTPIPE_POSIX_SWITCHING_BIT 31
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync#define RTPIPE_POSIX_USERS_MASK UINT32_C(0x3fffffff)
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync/** @} */
637712559132d2b3617aea0103fb0385978da14evboxsync
637712559132d2b3617aea0103fb0385978da14evboxsync
637712559132d2b3617aea0103fb0385978da14evboxsyncRTDECL(int) RTPipeCreate(PRTPIPE phPipeRead, PRTPIPE phPipeWrite, uint32_t fFlags)
637712559132d2b3617aea0103fb0385978da14evboxsync{
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync AssertPtrReturn(phPipeRead, VERR_INVALID_POINTER);
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync AssertPtrReturn(phPipeWrite, VERR_INVALID_POINTER);
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync AssertReturn(!(fFlags & ~RTPIPE_C_VALID_MASK), VERR_INVALID_PARAMETER);
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync /*
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync * Create the pipe and set the close-on-exec flag if requested.
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync */
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync int aFds[2] = {-1, -1};
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync if (pipe(aFds))
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync return RTErrConvertFromErrno(errno);
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync int rc = VINF_SUCCESS;
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync if (!(fFlags & RTPIPE_C_INHERIT_READ))
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync {
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync if (fcntl(aFds[0], F_SETFD, FD_CLOEXEC))
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync rc = RTErrConvertFromErrno(errno);
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync }
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync if (!(fFlags & RTPIPE_C_INHERIT_WRITE))
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync {
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync if (fcntl(aFds[1], F_SETFD, FD_CLOEXEC))
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync rc = RTErrConvertFromErrno(errno);
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync }
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync if (RT_SUCCESS(rc))
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync {
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync /*
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync * Create the two handles.
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync */
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync RTPIPEINTERNAL *pThisR = (RTPIPEINTERNAL *)RTMemAlloc(sizeof(RTPIPEINTERNAL));
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync if (pThisR)
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync {
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync RTPIPEINTERNAL *pThisW = (RTPIPEINTERNAL *)RTMemAlloc(sizeof(RTPIPEINTERNAL));
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync if (pThisW)
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync {
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync pThisR->u32Magic = RTPIPE_MAGIC;
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync pThisW->u32Magic = RTPIPE_MAGIC;
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync pThisR->fd = aFds[0];
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync pThisW->fd = aFds[1];
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync pThisR->fRead = true;
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync pThisW->fRead = false;
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync pThisR->u32State = RTPIPE_POSIX_BLOCKING;
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync pThisW->u32State = RTPIPE_POSIX_BLOCKING;
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync *phPipeRead = pThisR;
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync *phPipeWrite = pThisW;
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync /*
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync * Before we leave, make sure to shut up SIGPIPE.
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync */
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync signal(SIGPIPE, SIG_IGN);
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync return VINF_SUCCESS;
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync }
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync RTMemFree(pThisR);
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync }
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync }
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync close(aFds[0]);
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync close(aFds[1]);
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync return rc;
637712559132d2b3617aea0103fb0385978da14evboxsync}
637712559132d2b3617aea0103fb0385978da14evboxsync
637712559132d2b3617aea0103fb0385978da14evboxsync
637712559132d2b3617aea0103fb0385978da14evboxsyncRTDECL(int) RTPipeClose(RTPIPE hPipe)
637712559132d2b3617aea0103fb0385978da14evboxsync{
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync RTPIPEINTERNAL *pThis = hPipe;
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync if (pThis == NIL_RTPIPE)
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync return VINF_SUCCESS;
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync AssertPtrReturn(pThis, VERR_INVALID_PARAMETER);
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync AssertReturn(pThis->u32Magic == RTPIPE_MAGIC, VERR_INVALID_HANDLE);
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync /*
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync * Do the cleanup.
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync */
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync AssertReturn(ASMAtomicCmpXchgU32(&pThis->u32Magic, ~RTPIPE_MAGIC, RTPIPE_MAGIC), VERR_INVALID_HANDLE);
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync int fd = pThis->fd;
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync pThis->fd = -1;
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync close(fd);
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync if (ASMAtomicReadU32(&pThis->u32State) & RTPIPE_POSIX_USERS_MASK)
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync {
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync AssertFailed();
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync RTThreadSleep(1);
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync }
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync RTMemFree(pThis);
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync return VINF_SUCCESS;
637712559132d2b3617aea0103fb0385978da14evboxsync}
637712559132d2b3617aea0103fb0385978da14evboxsync
637712559132d2b3617aea0103fb0385978da14evboxsync
637712559132d2b3617aea0103fb0385978da14evboxsyncRTDECL(RTHCINTPTR) RTPipeToNative(RTPIPE hPipe)
637712559132d2b3617aea0103fb0385978da14evboxsync{
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync RTPIPEINTERNAL *pThis = hPipe;
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync AssertPtrReturn(pThis, (RTHCINTPTR)(unsigned int)-1);
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync AssertReturn(pThis->u32Magic == RTPIPE_MAGIC, (RTHCINTPTR)(unsigned int)-1);
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync return pThis->fd;
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync}
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync/**
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync * Prepare blocking mode.
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync *
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync * @returns VINF_SUCCESS
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync * @retval VERR_WRONG_ORDER
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync * @retval VERR_INTERNAL_ERROR_4
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync *
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync * @param pThis The pipe handle.
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync */
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsyncstatic int rtPipeTryBlocking(RTPIPEINTERNAL *pThis)
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync{
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync /*
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync * Update the state.
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync */
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync for (;;)
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync {
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync uint32_t u32State = ASMAtomicReadU32(&pThis->u32State);
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync uint32_t const u32StateOld = u32State;
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync uint32_t const cUsers = (u32State & RTPIPE_POSIX_USERS_MASK);
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync if (u32State & RTPIPE_POSIX_BLOCKING)
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync {
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync AssertReturn(cUsers < RTPIPE_POSIX_USERS_MASK / 2, VERR_INTERNAL_ERROR_4);
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync u32State &= ~RTPIPE_POSIX_USERS_MASK;
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync u32State |= cUsers + 1;
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync if (ASMAtomicCmpXchgU32(&pThis->u32State, u32State, u32StateOld))
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync {
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync if (u32State & RTPIPE_POSIX_SWITCHING)
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync break;
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync return VINF_SUCCESS;
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync }
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync }
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync else if (cUsers == 0)
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync {
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync u32State = 1 | RTPIPE_POSIX_SWITCHING | RTPIPE_POSIX_BLOCKING;
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync if (ASMAtomicCmpXchgU32(&pThis->u32State, u32State, u32StateOld))
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync break;
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync }
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync else
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync return VERR_WRONG_ORDER;
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync ASMNopPause();
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync }
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync /*
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync * Do the switching.
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync */
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync int fFlags = fcntl(pThis->fd, F_GETFL, 0);
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync if (fFlags != -1)
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync {
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync if ( !(fFlags & O_NONBLOCK)
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync || fcntl(pThis->fd, F_SETFL, fFlags & ~O_NONBLOCK) != -1)
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync {
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync ASMAtomicBitClear(&pThis->u32State, RTPIPE_POSIX_SWITCHING_BIT);
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync return VINF_SUCCESS;
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync }
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync }
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync ASMAtomicDecU32(&pThis->u32State);
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync return RTErrConvertFromErrno(errno);
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync}
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync/**
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync * Prepare non-blocking mode.
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync *
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync * @returns VINF_SUCCESS
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync * @retval VERR_WRONG_ORDER
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync * @retval VERR_INTERNAL_ERROR_4
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync *
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync * @param pThis The pipe handle.
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync */
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsyncstatic int rtPipeTryNonBlocking(RTPIPEINTERNAL *pThis)
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync{
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync /*
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync * Update the state.
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync */
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync for (;;)
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync {
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync uint32_t u32State = ASMAtomicReadU32(&pThis->u32State);
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync uint32_t const u32StateOld = u32State;
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync uint32_t const cUsers = (u32State & RTPIPE_POSIX_USERS_MASK);
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync if (!(u32State & RTPIPE_POSIX_BLOCKING))
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync {
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync AssertReturn(cUsers < RTPIPE_POSIX_USERS_MASK / 2, VERR_INTERNAL_ERROR_4);
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync u32State &= ~RTPIPE_POSIX_USERS_MASK;
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync u32State |= cUsers + 1;
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync if (ASMAtomicCmpXchgU32(&pThis->u32State, u32State, u32StateOld))
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync {
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync if (u32State & RTPIPE_POSIX_SWITCHING)
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync break;
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync return VINF_SUCCESS;
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync }
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync }
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync else if (cUsers == 0)
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync {
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync u32State = 1 | RTPIPE_POSIX_SWITCHING;
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync if (ASMAtomicCmpXchgU32(&pThis->u32State, u32State, u32StateOld))
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync break;
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync }
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync else
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync return VERR_WRONG_ORDER;
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync ASMNopPause();
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync }
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync /*
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync * Do the switching.
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync */
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync int fFlags = fcntl(pThis->fd, F_GETFL, 0);
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync if (fFlags != -1)
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync {
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync if ( (fFlags & O_NONBLOCK)
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync || fcntl(pThis->fd, F_SETFL, fFlags | O_NONBLOCK) != -1)
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync {
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync ASMAtomicBitClear(&pThis->u32State, RTPIPE_POSIX_SWITCHING_BIT);
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync return VINF_SUCCESS;
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync }
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync }
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync ASMAtomicDecU32(&pThis->u32State);
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync return RTErrConvertFromErrno(errno);
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync}
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync/**
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync * Checks if the read pipe has a HUP condition.
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync *
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync * @returns true if HUP, false if no.
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync * @param pThis The pipe handle (read).
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync */
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsyncstatic bool rtPipePosixHasHup(RTPIPEINTERNAL *pThis)
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync{
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync Assert(pThis->fRead);
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync struct pollfd PollFd;
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync RT_ZERO(PollFd);
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync PollFd.fd = pThis->fd;
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync PollFd.events = POLLHUP;
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync return poll(&PollFd, 1, 0) >= 1
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync && (PollFd.revents & POLLHUP);
637712559132d2b3617aea0103fb0385978da14evboxsync}
637712559132d2b3617aea0103fb0385978da14evboxsync
637712559132d2b3617aea0103fb0385978da14evboxsync
637712559132d2b3617aea0103fb0385978da14evboxsyncRTDECL(int) RTPipeRead(RTPIPE hPipe, void *pvBuf, size_t cbToRead, size_t *pcbRead)
637712559132d2b3617aea0103fb0385978da14evboxsync{
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync RTPIPEINTERNAL *pThis = hPipe;
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync AssertPtrReturn(pThis, VERR_INVALID_HANDLE);
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync AssertReturn(pThis->u32Magic == RTPIPE_MAGIC, VERR_INVALID_HANDLE);
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync AssertReturn(pThis->fRead, VERR_ACCESS_DENIED);
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync AssertPtr(pcbRead);
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync AssertPtr(pvBuf);
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync int rc = rtPipeTryNonBlocking(pThis);
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync if (RT_SUCCESS(rc))
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync {
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync ssize_t cbRead = read(pThis->fd, pvBuf, RT_MIN(cbToRead, SSIZE_MAX));
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync if (cbRead >= 0)
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync {
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync if (cbRead || !cbToRead || !rtPipePosixHasHup(pThis))
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync *pcbRead = cbRead;
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync else
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync rc = VERR_BROKEN_PIPE;
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync }
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync else if (errno == EAGAIN)
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync {
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync *pcbRead = 0;
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync rc = VINF_TRY_AGAIN;
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync }
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync else
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync rc = RTErrConvertFromErrno(errno);
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync ASMAtomicDecU32(&pThis->u32State);
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync }
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync return rc;
637712559132d2b3617aea0103fb0385978da14evboxsync}
637712559132d2b3617aea0103fb0385978da14evboxsync
637712559132d2b3617aea0103fb0385978da14evboxsync
637712559132d2b3617aea0103fb0385978da14evboxsyncRTDECL(int) RTPipeReadBlocking(RTPIPE hPipe, void *pvBuf, size_t cbToRead)
637712559132d2b3617aea0103fb0385978da14evboxsync{
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync RTPIPEINTERNAL *pThis = hPipe;
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync AssertPtrReturn(pThis, VERR_INVALID_HANDLE);
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync AssertReturn(pThis->u32Magic == RTPIPE_MAGIC, VERR_INVALID_HANDLE);
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync AssertReturn(pThis->fRead, VERR_ACCESS_DENIED);
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync AssertPtr(pvBuf);
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync int rc = rtPipeTryBlocking(pThis);
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync if (RT_SUCCESS(rc))
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync {
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync do
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync {
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync ssize_t cbRead = read(pThis->fd, pvBuf, RT_MIN(cbToRead, SSIZE_MAX));
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync if (cbRead < 0)
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync {
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync rc = RTErrConvertFromErrno(errno);
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync break;
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync }
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync if (!cbRead && cbToRead > 0 && rtPipePosixHasHup(pThis))
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync {
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync rc = VERR_BROKEN_PIPE;
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync break;
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync }
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync /* advance */
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync pvBuf = (char *)pvBuf + cbRead;
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync cbToRead -= cbRead;
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync } while (cbToRead > 0);
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync ASMAtomicDecU32(&pThis->u32State);
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync }
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync return rc;
637712559132d2b3617aea0103fb0385978da14evboxsync}
637712559132d2b3617aea0103fb0385978da14evboxsync
637712559132d2b3617aea0103fb0385978da14evboxsync
637712559132d2b3617aea0103fb0385978da14evboxsyncRTDECL(int) RTPipeWrite(RTPIPE hPipe, const void *pvBuf, size_t cbToWrite, size_t *pcbWritten)
637712559132d2b3617aea0103fb0385978da14evboxsync{
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync RTPIPEINTERNAL *pThis = hPipe;
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync AssertPtrReturn(pThis, VERR_INVALID_HANDLE);
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync AssertReturn(pThis->u32Magic == RTPIPE_MAGIC, VERR_INVALID_HANDLE);
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync AssertReturn(!pThis->fRead, VERR_ACCESS_DENIED);
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync AssertPtr(pcbWritten);
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync AssertPtr(pvBuf);
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync int rc = rtPipeTryNonBlocking(pThis);
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync if (RT_SUCCESS(rc))
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync {
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync ssize_t cbWritten = write(pThis->fd, pvBuf, RT_MIN(cbToWrite, SSIZE_MAX));
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync if (cbWritten >= 0)
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync *pcbWritten = cbWritten;
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync else if (errno == EAGAIN)
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync {
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync *pcbWritten = 0;;
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync rc = VINF_TRY_AGAIN;
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync }
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync else
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync rc = RTErrConvertFromErrno(errno);
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync ASMAtomicDecU32(&pThis->u32State);
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync }
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync return rc;
637712559132d2b3617aea0103fb0385978da14evboxsync}
637712559132d2b3617aea0103fb0385978da14evboxsync
637712559132d2b3617aea0103fb0385978da14evboxsync
637712559132d2b3617aea0103fb0385978da14evboxsyncRTDECL(int) RTPipeWriteBlocking(RTPIPE hPipe, const void *pvBuf, size_t cbToWrite)
637712559132d2b3617aea0103fb0385978da14evboxsync{
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync RTPIPEINTERNAL *pThis = hPipe;
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync AssertPtrReturn(pThis, VERR_INVALID_HANDLE);
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync AssertReturn(pThis->u32Magic == RTPIPE_MAGIC, VERR_INVALID_HANDLE);
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync AssertReturn(!pThis->fRead, VERR_ACCESS_DENIED);
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync AssertPtr(pvBuf);
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync int rc = rtPipeTryBlocking(pThis);
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync if (RT_SUCCESS(rc))
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync {
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync do
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync {
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync ssize_t cbWritten = write(pThis->fd, pvBuf, RT_MIN(cbToWrite, SSIZE_MAX));
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync if (cbWritten < 0)
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync {
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync rc = RTErrConvertFromErrno(errno);
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync break;
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync }
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync /* advance */
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync pvBuf = (char const *)pvBuf + cbWritten;
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync cbToWrite -= cbWritten;
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync } while (cbToWrite > 0);
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync ASMAtomicDecU32(&pThis->u32State);
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync }
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync return rc;
637712559132d2b3617aea0103fb0385978da14evboxsync}
637712559132d2b3617aea0103fb0385978da14evboxsync
637712559132d2b3617aea0103fb0385978da14evboxsync
637712559132d2b3617aea0103fb0385978da14evboxsyncRTDECL(int) RTPipeFlush(RTPIPE hPipe)
637712559132d2b3617aea0103fb0385978da14evboxsync{
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync RTPIPEINTERNAL *pThis = hPipe;
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync AssertPtrReturn(pThis, VERR_INVALID_HANDLE);
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync AssertReturn(pThis->u32Magic == RTPIPE_MAGIC, VERR_INVALID_HANDLE);
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync AssertReturn(!pThis->fRead, VERR_ACCESS_DENIED);
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync if (fsync(pThis->fd))
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync return RTErrConvertFromErrno(errno);
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync return VINF_SUCCESS;
637712559132d2b3617aea0103fb0385978da14evboxsync}
637712559132d2b3617aea0103fb0385978da14evboxsync
637712559132d2b3617aea0103fb0385978da14evboxsync
637712559132d2b3617aea0103fb0385978da14evboxsyncRTDECL(int) RTPipeSelectOne(RTPIPE hPipe, RTMSINTERVAL cMillies)
637712559132d2b3617aea0103fb0385978da14evboxsync{
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync RTPIPEINTERNAL *pThis = hPipe;
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync AssertPtrReturn(pThis, VERR_INVALID_HANDLE);
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync AssertReturn(pThis->u32Magic == RTPIPE_MAGIC, VERR_INVALID_HANDLE);
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync struct pollfd PollFd;
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync RT_ZERO(PollFd);
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync PollFd.fd = pThis->fd;
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync PollFd.events = POLLHUP | POLLERR;
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync if (pThis->fRead)
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync PollFd.events |= POLLIN | POLLPRI;
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync else
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync PollFd.events |= POLLOUT;
637712559132d2b3617aea0103fb0385978da14evboxsync
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync int timeout;
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync if ( cMillies == RT_INDEFINITE_WAIT
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync || cMillies >= INT_MAX /* lazy bird */)
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync timeout = -1;
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync else
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync timeout = cMillies;
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync int rc = poll(&PollFd, 1, 0);
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync if (rc == -1)
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync return RTErrConvertFromErrno(errno);
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync return rc > 0 ? VINF_SUCCESS : VERR_TIMEOUT;
b41f65ee355ae1d4b24473c6d6d70c653497429avboxsync}
637712559132d2b3617aea0103fb0385978da14evboxsync