/* $Id: serialport-win.cpp $ */ /** @file * IPRT - Serial Port API, Windows Implementation. */ /* * Copyright (C) 2017-2019 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 #include "internal/iprt.h" #include #include #include #include #include #include #include #include #include "internal/magics.h" #include /********************************************************************************************************************************* * Structures and Typedefs * *********************************************************************************************************************************/ /** * Internal serial port state. */ typedef struct RTSERIALPORTINTERNAL { /** Magic value (RTSERIALPORT_MAGIC). */ uint32_t u32Magic; /** Flags given while opening the serial port. */ uint32_t fOpenFlags; /** The device handle. */ HANDLE hDev; /** The overlapped write structure. */ OVERLAPPED OverlappedWrite; /** The overlapped read structure. */ OVERLAPPED OverlappedRead; /** The overlapped I/O structure when waiting on events. */ OVERLAPPED OverlappedEvt; /** The event handle to wait on for the overlapped event operations of the device. */ HANDLE hEvtDev; /** The event handle to wait on for the overlapped write operations of the device. */ HANDLE hEvtWrite; /** The event handle to wait on for the overlapped read operations of the device. */ HANDLE hEvtRead; /** The event handle to wait on for waking up waiting threads externally. */ HANDLE hEvtIntr; /** Events currently waited for. */ uint32_t fEvtMask; /** Flag whether a write is currently pending. */ bool fWritePending; /** Bounce buffer for writes. */ uint8_t *pbBounceBuf; /** Amount of used buffer space. */ size_t cbBounceBufUsed; /** Amount of allocated buffer space. */ size_t cbBounceBufAlloc; /** The current active port config. */ DCB PortCfg; } RTSERIALPORTINTERNAL; /** Pointer to the internal serial port state. */ typedef RTSERIALPORTINTERNAL *PRTSERIALPORTINTERNAL; /********************************************************************************************************************************* * Defined Constants And Macros * *********************************************************************************************************************************/ /** The pipe buffer size we prefer. */ #define RTSERIALPORT_NT_SIZE _32K /********************************************************************************************************************************* * Global variables * *********************************************************************************************************************************/ /********************************************************************************************************************************* * Internal Functions * *********************************************************************************************************************************/ /** * Updatest the current event mask to wait for. * * @returns IPRT status code. * @param pThis The internal serial port instance data. * @param fEvtMask The new event mask to change to. */ static int rtSerialPortWinUpdateEvtMask(PRTSERIALPORTINTERNAL pThis, uint32_t fEvtMask) { DWORD dwEvtMask = EV_ERR; if (fEvtMask & RTSERIALPORT_EVT_F_DATA_RX) dwEvtMask |= EV_RXCHAR; if (fEvtMask & RTSERIALPORT_EVT_F_DATA_TX) dwEvtMask |= EV_TXEMPTY; if (fEvtMask & RTSERIALPORT_EVT_F_BREAK_DETECTED) dwEvtMask |= EV_BREAK; if (fEvtMask & RTSERIALPORT_EVT_F_STATUS_LINE_CHANGED) dwEvtMask |= EV_CTS | EV_DSR | EV_RING | EV_RLSD; int rc = VINF_SUCCESS; if (!SetCommMask(pThis->hDev, dwEvtMask)) rc = RTErrConvertFromWin32(GetLastError()); else pThis->fEvtMask = fEvtMask; return rc; } /** * Tries to set the default config on the given serial port. * * @returns IPRT status code. * @param pThis The internal serial port instance data. */ static int rtSerialPortSetDefaultCfg(PRTSERIALPORTINTERNAL pThis) { if (!PurgeComm(pThis->hDev, PURGE_RXABORT | PURGE_RXCLEAR | PURGE_TXABORT | PURGE_TXCLEAR)) return RTErrConvertFromWin32(GetLastError()); pThis->PortCfg.DCBlength = sizeof(pThis->PortCfg); if (!GetCommState(pThis->hDev, &pThis->PortCfg)) return RTErrConvertFromWin32(GetLastError()); pThis->PortCfg.BaudRate = CBR_9600; pThis->PortCfg.fBinary = TRUE; pThis->PortCfg.fParity = TRUE; pThis->PortCfg.fDtrControl = DTR_CONTROL_DISABLE; pThis->PortCfg.ByteSize = 8; pThis->PortCfg.Parity = NOPARITY; int rc = VINF_SUCCESS; if (!SetCommState(pThis->hDev, &pThis->PortCfg)) rc = RTErrConvertFromWin32(GetLastError()); if (RT_SUCCESS(rc)) { /* * Set timeouts for non blocking mode. * See https://docs.microsoft.com/en-us/windows/desktop/api/winbase/ns-winbase-_commtimeouts . */ COMMTIMEOUTS ComTimeouts; RT_ZERO(ComTimeouts); ComTimeouts.ReadIntervalTimeout = MAXDWORD; if (!SetCommTimeouts(pThis->hDev, &ComTimeouts)) rc = RTErrConvertFromWin32(GetLastError()); } return rc; } /** * Common worker for handling I/O completion. * * This is used by RTSerialPortClose, RTSerialPortWrite and RTPipeSerialPortNB. * * @returns IPRT status code. * @param pThis The pipe instance handle. */ static int rtSerialPortWriteCheckCompletion(PRTSERIALPORTINTERNAL pThis) { int rc = VINF_SUCCESS; DWORD dwRc = WaitForSingleObject(pThis->OverlappedWrite.hEvent, 0); if (dwRc == WAIT_OBJECT_0) { DWORD cbWritten = 0; if (GetOverlappedResult(pThis->hDev, &pThis->OverlappedWrite, &cbWritten, TRUE)) { for (;;) { if (cbWritten >= pThis->cbBounceBufUsed) { pThis->fWritePending = false; rc = VINF_SUCCESS; break; } /* resubmit the remainder of the buffer - can this actually happen? */ memmove(&pThis->pbBounceBuf[0], &pThis->pbBounceBuf[cbWritten], pThis->cbBounceBufUsed - cbWritten); rc = ResetEvent(pThis->OverlappedWrite.hEvent); Assert(rc == TRUE); if (!WriteFile(pThis->hDev, pThis->pbBounceBuf, (DWORD)pThis->cbBounceBufUsed, &cbWritten, &pThis->OverlappedWrite)) { if (GetLastError() == ERROR_IO_PENDING) rc = VINF_TRY_AGAIN; else { pThis->fWritePending = false; rc = RTErrConvertFromWin32(GetLastError()); } break; } Assert(cbWritten > 0); } } else { pThis->fWritePending = false; rc = RTErrConvertFromWin32(GetLastError()); } } else if (dwRc == WAIT_TIMEOUT) rc = VINF_TRY_AGAIN; else { pThis->fWritePending = false; if (dwRc == WAIT_ABANDONED) rc = VERR_INVALID_HANDLE; else rc = RTErrConvertFromWin32(GetLastError()); } return rc; } RTDECL(int) RTSerialPortOpen(PRTSERIALPORT phSerialPort, const char *pszPortAddress, uint32_t fFlags) { AssertPtrReturn(phSerialPort, VERR_INVALID_POINTER); AssertReturn(VALID_PTR(pszPortAddress) && *pszPortAddress != '\0', VERR_INVALID_PARAMETER); AssertReturn(!(fFlags & ~RTSERIALPORT_OPEN_F_VALID_MASK), VERR_INVALID_PARAMETER); AssertReturn((fFlags & RTSERIALPORT_OPEN_F_READ) || (fFlags & RTSERIALPORT_OPEN_F_WRITE), VERR_INVALID_PARAMETER); int rc = VINF_SUCCESS; PRTSERIALPORTINTERNAL pThis = (PRTSERIALPORTINTERNAL)RTMemAllocZ(sizeof(*pThis)); if (pThis) { pThis->u32Magic = RTSERIALPORT_MAGIC; pThis->fOpenFlags = fFlags; pThis->fEvtMask = 0; pThis->fWritePending = false; pThis->pbBounceBuf = NULL; pThis->cbBounceBufUsed = 0; pThis->cbBounceBufAlloc = 0; RT_ZERO(pThis->OverlappedEvt); RT_ZERO(pThis->OverlappedWrite); RT_ZERO(pThis->OverlappedRead); pThis->hEvtDev = CreateEvent(NULL, TRUE, FALSE, NULL); if (pThis->hEvtDev) { pThis->OverlappedEvt.hEvent = pThis->hEvtDev, pThis->hEvtIntr = CreateEvent(NULL, FALSE, FALSE, NULL); if (pThis->hEvtIntr) { pThis->hEvtWrite = CreateEvent(NULL, TRUE, TRUE, NULL); if (pThis->hEvtWrite) { pThis->OverlappedWrite.hEvent = pThis->hEvtWrite; pThis->hEvtRead = CreateEvent(NULL, TRUE, TRUE, NULL); if (pThis->hEvtRead) { pThis->OverlappedRead.hEvent = pThis->hEvtRead; DWORD fWinFlags = 0; if (fFlags & RTSERIALPORT_OPEN_F_WRITE) fWinFlags |= GENERIC_WRITE; if (fFlags & RTSERIALPORT_OPEN_F_READ) fWinFlags |= GENERIC_READ; pThis->hDev = CreateFile(pszPortAddress, fWinFlags, 0, /* Must be opened with exclusive access. */ NULL, /* No SECURITY_ATTRIBUTES structure. */ OPEN_EXISTING, /* Must use OPEN_EXISTING. */ FILE_FLAG_OVERLAPPED, /* Overlapped I/O. */ NULL); if (pThis->hDev) { rc = rtSerialPortSetDefaultCfg(pThis); if (RT_SUCCESS(rc)) { *phSerialPort = pThis; return rc; } } else rc = RTErrConvertFromWin32(GetLastError()); CloseHandle(pThis->hEvtRead); } CloseHandle(pThis->hEvtWrite); } CloseHandle(pThis->hEvtIntr); } else rc = RTErrConvertFromWin32(GetLastError()); CloseHandle(pThis->hEvtDev); } else rc = RTErrConvertFromWin32(GetLastError()); RTMemFree(pThis); } else rc = VERR_NO_MEMORY; return rc; } RTDECL(int) RTSerialPortClose(RTSERIALPORT hSerialPort) { PRTSERIALPORTINTERNAL pThis = hSerialPort; if (pThis == NIL_RTSERIALPORT) return VINF_SUCCESS; AssertPtrReturn(pThis, VERR_INVALID_PARAMETER); AssertReturn(pThis->u32Magic == RTSERIALPORT_MAGIC, VERR_INVALID_HANDLE); /* * Do the cleanup. */ AssertReturn(ASMAtomicCmpXchgU32(&pThis->u32Magic, RTSERIALPORT_MAGIC_DEAD, RTSERIALPORT_MAGIC), VERR_INVALID_HANDLE); if (pThis->fWritePending) rtSerialPortWriteCheckCompletion(pThis); CloseHandle(pThis->hDev); CloseHandle(pThis->hEvtDev); CloseHandle(pThis->hEvtWrite); CloseHandle(pThis->hEvtRead); CloseHandle(pThis->hEvtIntr); pThis->hDev = NULL; pThis->hEvtDev = NULL; pThis->hEvtWrite = NULL; pThis->hEvtRead = NULL; pThis->hEvtIntr = NULL; RTMemFree(pThis); return VINF_SUCCESS; } RTDECL(RTHCINTPTR) RTSerialPortToNative(RTSERIALPORT hSerialPort) { PRTSERIALPORTINTERNAL pThis = hSerialPort; AssertPtrReturn(pThis, -1); AssertReturn(pThis->u32Magic == RTSERIALPORT_MAGIC, -1); return (RTHCINTPTR)pThis->hDev; } RTDECL(int) RTSerialPortRead(RTSERIALPORT hSerialPort, void *pvBuf, size_t cbToRead, size_t *pcbRead) { PRTSERIALPORTINTERNAL pThis = hSerialPort; AssertPtrReturn(pThis, VERR_INVALID_PARAMETER); AssertReturn(pThis->u32Magic == RTSERIALPORT_MAGIC, VERR_INVALID_HANDLE); AssertPtrReturn(pvBuf, VERR_INVALID_POINTER); AssertReturn(cbToRead > 0, VERR_INVALID_PARAMETER); /* * Kick of an overlapped read. */ int rc = VINF_SUCCESS; uint8_t *pbBuf = (uint8_t *)pvBuf; while ( cbToRead > 0 && RT_SUCCESS(rc)) { BOOL fSucc = ResetEvent(pThis->OverlappedRead.hEvent); Assert(fSucc == TRUE); RT_NOREF(fSucc); DWORD cbRead = 0; if (ReadFile(pThis->hDev, pbBuf, cbToRead <= ~(DWORD)0 ? (DWORD)cbToRead : ~(DWORD)0, &cbRead, &pThis->OverlappedRead)) { if (pcbRead) { *pcbRead = cbRead; break; } rc = VINF_SUCCESS; } else if (GetLastError() == ERROR_IO_PENDING) { DWORD dwWait = WaitForSingleObject(pThis->OverlappedRead.hEvent, INFINITE); if (dwWait == WAIT_OBJECT_0) { if (GetOverlappedResult(pThis->hDev, &pThis->OverlappedRead, &cbRead, TRUE /*fWait*/)) { if (pcbRead) { *pcbRead = cbRead; break; } rc = VINF_SUCCESS; } else rc = RTErrConvertFromWin32(GetLastError()); } else { Assert(dwWait == WAIT_FAILED); rc = RTErrConvertFromWin32(GetLastError()); } } else rc = RTErrConvertFromWin32(GetLastError()); if (RT_SUCCESS(rc)) { cbToRead -= cbRead; pbBuf += cbRead; } } return rc; } RTDECL(int) RTSerialPortReadNB(RTSERIALPORT hSerialPort, void *pvBuf, size_t cbToRead, size_t *pcbRead) { PRTSERIALPORTINTERNAL pThis = hSerialPort; AssertPtrReturn(pThis, VERR_INVALID_PARAMETER); AssertReturn(pThis->u32Magic == RTSERIALPORT_MAGIC, VERR_INVALID_HANDLE); AssertPtrReturn(pvBuf, VERR_INVALID_POINTER); AssertReturn(cbToRead > 0, VERR_INVALID_PARAMETER); AssertPtrReturn(pcbRead, VERR_INVALID_POINTER); *pcbRead = 0; /* Check whether there is data waiting in the input queue. */ int rc = VINF_SUCCESS; COMSTAT ComStat; RT_ZERO(ComStat); if (ClearCommError(pThis->hDev, NULL, &ComStat)) { if (ComStat.cbInQue > 0) { DWORD dwToRead = RT_MIN(ComStat.cbInQue, (DWORD)cbToRead); /* Kick of an overlapped read. It should return immediately */ BOOL fSucc = ResetEvent(pThis->OverlappedRead.hEvent); Assert(fSucc == TRUE); RT_NOREF(fSucc); DWORD cbRead = 0; if ( cbToRead == 0 || ReadFile(pThis->hDev, pvBuf, dwToRead, &cbRead, &pThis->OverlappedRead)) *pcbRead = cbRead; else if (GetLastError() == ERROR_IO_PENDING) { /* This shouldn't actually happen, so turn this into a synchronous read. */ if (GetOverlappedResult(pThis->hDev, &pThis->OverlappedRead, &cbRead, TRUE /*fWait*/)) *pcbRead = cbRead; else rc = RTErrConvertFromWin32(GetLastError()); } else rc = RTErrConvertFromWin32(GetLastError()); } else rc = VINF_TRY_AGAIN; } else rc = RTErrConvertFromWin32(GetLastError()); return rc; } RTDECL(int) RTSerialPortWrite(RTSERIALPORT hSerialPort, const void *pvBuf, size_t cbToWrite, size_t *pcbWritten) { PRTSERIALPORTINTERNAL pThis = hSerialPort; AssertPtrReturn(pThis, VERR_INVALID_PARAMETER); AssertReturn(pThis->u32Magic == RTSERIALPORT_MAGIC, VERR_INVALID_HANDLE); AssertPtrReturn(pvBuf, VERR_INVALID_POINTER); AssertReturn(cbToWrite > 0, VERR_INVALID_PARAMETER); /* If I/O is pending, check if it has completed. */ int rc = VINF_SUCCESS; if (pThis->fWritePending) rc = rtSerialPortWriteCheckCompletion(pThis); if (rc == VINF_SUCCESS) { const uint8_t *pbBuf = (const uint8_t *)pvBuf; while ( cbToWrite > 0 && RT_SUCCESS(rc)) { BOOL fSucc = ResetEvent(pThis->OverlappedWrite.hEvent); Assert(fSucc == TRUE); RT_NOREF(fSucc); DWORD cbWritten = 0; if (WriteFile(pThis->hDev, pbBuf, cbToWrite <= ~(DWORD)0 ? (DWORD)cbToWrite : ~(DWORD)0, &cbWritten, &pThis->OverlappedWrite)) { if (pcbWritten) { *pcbWritten = cbWritten; break; } rc = VINF_SUCCESS; } else if (GetLastError() == ERROR_IO_PENDING) { DWORD dwWait = WaitForSingleObject(pThis->OverlappedWrite.hEvent, INFINITE); if (dwWait == WAIT_OBJECT_0) { if (GetOverlappedResult(pThis->hDev, &pThis->OverlappedWrite, &cbWritten, TRUE /*fWait*/)) { if (pcbWritten) { *pcbWritten = cbWritten; break; } rc = VINF_SUCCESS; } else rc = RTErrConvertFromWin32(GetLastError()); } else { Assert(dwWait == WAIT_FAILED); rc = RTErrConvertFromWin32(GetLastError()); } } else rc = RTErrConvertFromWin32(GetLastError()); if (RT_SUCCESS(rc)) { cbToWrite -= cbWritten; pbBuf += cbWritten; } } } return rc; } RTDECL(int) RTSerialPortWriteNB(RTSERIALPORT hSerialPort, const void *pvBuf, size_t cbToWrite, size_t *pcbWritten) { PRTSERIALPORTINTERNAL pThis = hSerialPort; AssertPtrReturn(pThis, VERR_INVALID_PARAMETER); AssertReturn(pThis->u32Magic == RTSERIALPORT_MAGIC, VERR_INVALID_HANDLE); AssertPtrReturn(pvBuf, VERR_INVALID_POINTER); AssertReturn(cbToWrite > 0, VERR_INVALID_PARAMETER); AssertPtrReturn(pcbWritten, VERR_INVALID_POINTER); /* If I/O is pending, check if it has completed. */ int rc = VINF_SUCCESS; if (pThis->fWritePending) rc = rtSerialPortWriteCheckCompletion(pThis); if (rc == VINF_SUCCESS) { Assert(!pThis->fWritePending); /* Do the bounce buffering. */ if ( pThis->cbBounceBufAlloc < cbToWrite && pThis->cbBounceBufAlloc < RTSERIALPORT_NT_SIZE) { if (cbToWrite > RTSERIALPORT_NT_SIZE) cbToWrite = RTSERIALPORT_NT_SIZE; void *pv = RTMemRealloc(pThis->pbBounceBuf, RT_ALIGN_Z(cbToWrite, _1K)); if (pv) { pThis->pbBounceBuf = (uint8_t *)pv; pThis->cbBounceBufAlloc = RT_ALIGN_Z(cbToWrite, _1K); } else rc = VERR_NO_MEMORY; } else if (cbToWrite > RTSERIALPORT_NT_SIZE) cbToWrite = RTSERIALPORT_NT_SIZE; if (RT_SUCCESS(rc) && cbToWrite) { memcpy(pThis->pbBounceBuf, pvBuf, cbToWrite); pThis->cbBounceBufUsed = (uint32_t)cbToWrite; /* Submit the write. */ rc = ResetEvent(pThis->OverlappedWrite.hEvent); Assert(rc == TRUE); DWORD cbWritten = 0; if (WriteFile(pThis->hDev, pThis->pbBounceBuf, (DWORD)pThis->cbBounceBufUsed, &cbWritten, &pThis->OverlappedWrite)) { *pcbWritten = RT_MIN(cbWritten, cbToWrite); /* paranoia^3 */ rc = VINF_SUCCESS; } else if (GetLastError() == ERROR_IO_PENDING) { *pcbWritten = cbToWrite; pThis->fWritePending = true; rc = VINF_SUCCESS; } else rc = RTErrConvertFromWin32(GetLastError()); } else if (RT_SUCCESS(rc)) *pcbWritten = 0; } else if (RT_SUCCESS(rc)) *pcbWritten = 0; return rc; } RTDECL(int) RTSerialPortCfgQueryCurrent(RTSERIALPORT hSerialPort, PRTSERIALPORTCFG pCfg) { PRTSERIALPORTINTERNAL pThis = hSerialPort; AssertPtrReturn(pThis, VERR_INVALID_PARAMETER); AssertReturn(pThis->u32Magic == RTSERIALPORT_MAGIC, VERR_INVALID_HANDLE); pCfg->uBaudRate = pThis->PortCfg.BaudRate; switch (pThis->PortCfg.Parity) { case NOPARITY: pCfg->enmParity = RTSERIALPORTPARITY_NONE; break; case EVENPARITY: pCfg->enmParity = RTSERIALPORTPARITY_EVEN; break; case ODDPARITY: pCfg->enmParity = RTSERIALPORTPARITY_ODD; break; case MARKPARITY: pCfg->enmParity = RTSERIALPORTPARITY_MARK; break; case SPACEPARITY: pCfg->enmParity = RTSERIALPORTPARITY_SPACE; break; default: AssertFailed(); return VERR_INTERNAL_ERROR; } switch (pThis->PortCfg.ByteSize) { case 5: pCfg->enmDataBitCount = RTSERIALPORTDATABITS_5BITS; break; case 6: pCfg->enmDataBitCount = RTSERIALPORTDATABITS_6BITS; break; case 7: pCfg->enmDataBitCount = RTSERIALPORTDATABITS_7BITS; break; case 8: pCfg->enmDataBitCount = RTSERIALPORTDATABITS_8BITS; break; default: AssertFailed(); return VERR_INTERNAL_ERROR; } switch (pThis->PortCfg.StopBits) { case ONESTOPBIT: pCfg->enmStopBitCount = RTSERIALPORTSTOPBITS_ONE; break; case ONE5STOPBITS: pCfg->enmStopBitCount = RTSERIALPORTSTOPBITS_ONEPOINTFIVE; break; case TWOSTOPBITS: pCfg->enmStopBitCount = RTSERIALPORTSTOPBITS_TWO; break; default: AssertFailed(); return VERR_INTERNAL_ERROR; } return VINF_SUCCESS; } RTDECL(int) RTSerialPortCfgSet(RTSERIALPORT hSerialPort, PCRTSERIALPORTCFG pCfg, PRTERRINFO pErrInfo) { PRTSERIALPORTINTERNAL pThis = hSerialPort; AssertPtrReturn(pThis, VERR_INVALID_PARAMETER); AssertReturn(pThis->u32Magic == RTSERIALPORT_MAGIC, VERR_INVALID_HANDLE); RT_NOREF(pErrInfo); DCB DcbNew; memcpy(&DcbNew, &pThis->PortCfg, sizeof(DcbNew)); DcbNew.BaudRate = pCfg->uBaudRate; switch (pCfg->enmParity) { case RTSERIALPORTPARITY_NONE: DcbNew.Parity = NOPARITY; break; case RTSERIALPORTPARITY_EVEN: DcbNew.Parity = EVENPARITY; break; case RTSERIALPORTPARITY_ODD: DcbNew.Parity = ODDPARITY; break; case RTSERIALPORTPARITY_MARK: DcbNew.Parity = MARKPARITY; break; case RTSERIALPORTPARITY_SPACE: DcbNew.Parity = SPACEPARITY; break; default: AssertFailedReturn(VERR_INVALID_PARAMETER); } switch (pCfg->enmDataBitCount) { case RTSERIALPORTDATABITS_5BITS: DcbNew.ByteSize = 5; break; case RTSERIALPORTDATABITS_6BITS: DcbNew.ByteSize = 6; break; case RTSERIALPORTDATABITS_7BITS: DcbNew.ByteSize = 7; break; case RTSERIALPORTDATABITS_8BITS: DcbNew.ByteSize = 8; break; default: AssertFailedReturn(VERR_INVALID_PARAMETER); } switch (pCfg->enmStopBitCount) { case RTSERIALPORTSTOPBITS_ONE: DcbNew.StopBits = ONESTOPBIT; break; case RTSERIALPORTSTOPBITS_ONEPOINTFIVE: AssertReturn(pCfg->enmDataBitCount == RTSERIALPORTDATABITS_5BITS, VERR_INVALID_PARAMETER); DcbNew.StopBits = ONE5STOPBITS; break; case RTSERIALPORTSTOPBITS_TWO: AssertReturn(pCfg->enmDataBitCount != RTSERIALPORTDATABITS_5BITS, VERR_INVALID_PARAMETER); DcbNew.StopBits = TWOSTOPBITS; break; default: AssertFailedReturn(VERR_INVALID_PARAMETER); } int rc = VINF_SUCCESS; if (!SetCommState(pThis->hDev, &DcbNew)) rc = RTErrConvertFromWin32(GetLastError()); else memcpy(&pThis->PortCfg, &DcbNew, sizeof(DcbNew)); return rc; } RTDECL(int) RTSerialPortEvtPoll(RTSERIALPORT hSerialPort, uint32_t fEvtMask, uint32_t *pfEvtsRecv, RTMSINTERVAL msTimeout) { PRTSERIALPORTINTERNAL pThis = hSerialPort; AssertPtrReturn(pThis, VERR_INVALID_PARAMETER); AssertReturn(pThis->u32Magic == RTSERIALPORT_MAGIC, VERR_INVALID_HANDLE); AssertReturn(!(fEvtMask & ~RTSERIALPORT_EVT_F_VALID_MASK), VERR_INVALID_PARAMETER); AssertPtrReturn(pfEvtsRecv, VERR_INVALID_POINTER); *pfEvtsRecv = 0; int rc = VINF_SUCCESS; if (fEvtMask != pThis->fEvtMask) rc = rtSerialPortWinUpdateEvtMask(pThis, fEvtMask); /* * EV_RXCHAR is triggered only if a byte is received after the event mask is set, * not if there is already something in the input buffer. Thatswhy we check the input * buffer for any stored data and the output buffer whether it is empty and return * the appropriate flags. */ if (RT_SUCCESS(rc)) { COMSTAT ComStat; RT_ZERO(ComStat); if (!ClearCommError(pThis->hDev, NULL, &ComStat)) return RTErrConvertFromWin32(GetLastError()); /* Check whether data is already waiting in the input buffer. */ if ( (fEvtMask & RTSERIALPORT_EVT_F_DATA_RX) && ComStat.cbInQue > 0) *pfEvtsRecv |= RTSERIALPORT_EVT_F_DATA_RX; /* Check whether the output buffer is empty. */ if ( (fEvtMask & RTSERIALPORT_EVT_F_DATA_TX) && ComStat.cbOutQue == 0) *pfEvtsRecv |= RTSERIALPORT_EVT_F_DATA_TX; /* Return if there is at least one event. */ if (*pfEvtsRecv != 0) return VINF_SUCCESS; } if (RT_SUCCESS(rc)) { DWORD dwEventMask = 0; HANDLE ahWait[2]; ahWait[0] = pThis->hEvtDev; ahWait[1] = pThis->hEvtIntr; RT_ZERO(pThis->OverlappedEvt); pThis->OverlappedEvt.hEvent = pThis->hEvtDev; if (!WaitCommEvent(pThis->hDev, &dwEventMask, &pThis->OverlappedEvt)) { DWORD dwRet = GetLastError(); if (dwRet == ERROR_IO_PENDING) { dwRet = WaitForMultipleObjects(2, ahWait, FALSE, msTimeout == RT_INDEFINITE_WAIT ? INFINITE : msTimeout); if (dwRet == WAIT_TIMEOUT) rc = VERR_TIMEOUT; else if (dwRet == WAIT_FAILED) rc = RTErrConvertFromWin32(GetLastError()); else if (dwRet != WAIT_OBJECT_0) rc = VERR_INTERRUPTED; } else rc = RTErrConvertFromWin32(dwRet); } if (RT_SUCCESS(rc)) { /* Check the event */ if (dwEventMask & EV_RXCHAR) *pfEvtsRecv |= RTSERIALPORT_EVT_F_DATA_RX; if (dwEventMask & EV_TXEMPTY) { if (pThis->fWritePending) { rc = rtSerialPortWriteCheckCompletion(pThis); if (rc == VINF_SUCCESS) *pfEvtsRecv |= RTSERIALPORT_EVT_F_DATA_TX; else rc = VINF_SUCCESS; } else *pfEvtsRecv |= RTSERIALPORT_EVT_F_DATA_TX; } if (dwEventMask & EV_BREAK) *pfEvtsRecv |= RTSERIALPORT_EVT_F_BREAK_DETECTED; if (dwEventMask & (EV_CTS | EV_DSR | EV_RING | EV_RLSD)) *pfEvtsRecv |= RTSERIALPORT_EVT_F_STATUS_LINE_CHANGED; } } return rc; } RTDECL(int) RTSerialPortEvtPollInterrupt(RTSERIALPORT hSerialPort) { PRTSERIALPORTINTERNAL pThis = hSerialPort; AssertPtrReturn(pThis, VERR_INVALID_PARAMETER); AssertReturn(pThis->u32Magic == RTSERIALPORT_MAGIC, VERR_INVALID_HANDLE); if (!SetEvent(pThis->hEvtIntr)) return RTErrConvertFromWin32(GetLastError()); return VINF_SUCCESS; } RTDECL(int) RTSerialPortChgBreakCondition(RTSERIALPORT hSerialPort, bool fSet) { PRTSERIALPORTINTERNAL pThis = hSerialPort; AssertPtrReturn(pThis, VERR_INVALID_PARAMETER); AssertReturn(pThis->u32Magic == RTSERIALPORT_MAGIC, VERR_INVALID_HANDLE); BOOL fSucc = FALSE; if (fSet) fSucc = SetCommBreak(pThis->hDev); else fSucc = ClearCommBreak(pThis->hDev); int rc = VINF_SUCCESS; if (!fSucc) rc = RTErrConvertFromWin32(GetLastError()); return rc; } RTDECL(int) RTSerialPortChgStatusLines(RTSERIALPORT hSerialPort, uint32_t fClear, uint32_t fSet) { PRTSERIALPORTINTERNAL pThis = hSerialPort; AssertPtrReturn(pThis, VERR_INVALID_PARAMETER); AssertReturn(pThis->u32Magic == RTSERIALPORT_MAGIC, VERR_INVALID_HANDLE); BOOL fSucc = TRUE; if (fSet & RTSERIALPORT_CHG_STS_LINES_F_DTR) fSucc = EscapeCommFunction(pThis->hDev, SETDTR); if ( fSucc && (fSet & RTSERIALPORT_CHG_STS_LINES_F_RTS)) fSucc = EscapeCommFunction(pThis->hDev, SETRTS); if ( fSucc && (fClear & RTSERIALPORT_CHG_STS_LINES_F_DTR)) fSucc = EscapeCommFunction(pThis->hDev, CLRDTR); if ( fSucc && (fClear & RTSERIALPORT_CHG_STS_LINES_F_RTS)) fSucc = EscapeCommFunction(pThis->hDev, CLRRTS); int rc = VINF_SUCCESS; if (!fSucc) rc = RTErrConvertFromWin32(GetLastError()); return rc; } RTDECL(int) RTSerialPortQueryStatusLines(RTSERIALPORT hSerialPort, uint32_t *pfStsLines) { PRTSERIALPORTINTERNAL pThis = hSerialPort; AssertPtrReturn(pThis, VERR_INVALID_PARAMETER); AssertReturn(pThis->u32Magic == RTSERIALPORT_MAGIC, VERR_INVALID_HANDLE); AssertPtrReturn(pfStsLines, VERR_INVALID_POINTER); *pfStsLines = 0; int rc = VINF_SUCCESS; DWORD fStsLinesQueried = 0; /* Get the new state */ if (GetCommModemStatus(pThis->hDev, &fStsLinesQueried)) { *pfStsLines |= (fStsLinesQueried & MS_RLSD_ON) ? RTSERIALPORT_STS_LINE_DCD : 0; *pfStsLines |= (fStsLinesQueried & MS_RING_ON) ? RTSERIALPORT_STS_LINE_RI : 0; *pfStsLines |= (fStsLinesQueried & MS_DSR_ON) ? RTSERIALPORT_STS_LINE_DSR : 0; *pfStsLines |= (fStsLinesQueried & MS_CTS_ON) ? RTSERIALPORT_STS_LINE_CTS : 0; } else rc = RTErrConvertFromWin32(GetLastError()); return rc; }