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/*
* Tclwinserial.c --
*
* This file implements the Windows-specific serial port functions,
* and the "serial" channel driver.
*
* Copyright (c) 1999 by Scriptics Corp.
*
* See the file "license.terms" for information on usage and redistribution
* of this file, and for a DISCLAIMER OF ALL WARRANTIES.
*
* RCS: @(#) $Id: tclWinSerial.c,v 1.1.2.2 1999/03/14 18:55:12 stanton Exp $
* RCS: @(#) $Id: tclWinSerial.c,v 1.1.2.3 1999/03/24 02:37:14 redman Exp $
*/
#include "tclWinInt.h"
#include <dos.h>
#include <fcntl.h>
#include <io.h>
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#define SERIAL_PENDING (1<<0) /* Message is pending in the queue. */
#define SERIAL_ASYNC (1<<1) /* Channel is non-blocking. */
/*
* Bit masks used in the sharedFlags field of the SerialInfo structure below.
*/
#define SERIAL_EOF (1<<2) /* Serial has reached EOF. */
#define SERIAL_EOF (1<<2) /* Serial has reached EOF. */
#define SERIAL_EXTRABYTE (1<<3) /* Extra byte consumed while waiting for data */
/*
* This structure describes per-instance data for a serial based channel.
*/
typedef struct SerialInfo {
HANDLE handle;
struct SerialInfo *nextPtr; /* Pointer to next registered serial. */
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int readFlags; /* Flags that are shared with the reader
* thread. Access is synchronized with the
* readable object. */
int writeFlags; /* Flags that are shared with the writer
* thread. Access is synchronized with the
* readable object. */
int readyMask; /* Events that need to be checked on. */
char extraByte;
} SerialInfo;
typedef struct ThreadSpecificData {
/*
* The following pointer refers to the head of the list of serials
* that are being watched for file events.
*/
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CloseHandle(serialPtr->startReader);
serialPtr->readThread = NULL;
}
serialPtr->validMask &= ~TCL_READABLE;
if (serialPtr->writeThread) {
WaitForSingleObject(serialPtr->writable, INFINITE);
TerminateThread(serialPtr->writeThread, 0);
/*
* Wait for the thread to terminate. This ensures that we are
* completely cleaned up before we leave this function.
*/
WaitForSingleObject(serialPtr->writeThread, INFINITE);
TerminateThread(serialPtr->writeThread, 0);
CloseHandle(serialPtr->writeThread);
CloseHandle(serialPtr->writable);
CloseHandle(serialPtr->startWriter);
serialPtr->writeThread = NULL;
}
serialPtr->validMask &= ~TCL_WRITABLE;
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int bufSize, /* How much space is available
* in the buffer? */
int *errorCode) /* Where to store error code. */
{
SerialInfo *infoPtr = (SerialInfo *) instanceData;
DWORD bytesRead = 0;
int result;
DWORD errors, err;
DWORD err;
DWORD mask = 0;
COMSTAT stat;
*errorCode = 0;
/*
* Synchronize with the reader thread.
*/
result = WaitForRead(infoPtr, (infoPtr->flags & SERIAL_ASYNC) ? 0 : 1);
/*
* If an error occurred, return immediately.
*/
if (result == -1) {
*errorCode = errno;
return -1;
}
infoPtr->readyMask &= ~TCL_READABLE;
if (infoPtr->readFlags & SERIAL_EXTRABYTE) {
if (ClearCommError(infoPtr->handle, &errors, &stat)) {
/*
* If there are errors, then signal an I/O error.
*/
* If a byte was consumed waiting, then put it in the buffer.
if (errors != 0) {
*errorCode = EIO;
return -1;
}
/*
* Otherwise, it's not that fatal, so check the queue
*/
if (stat.cbInQue != 0) {
*buf = infoPtr->extraByte;
/*
* If the buffer is bigger than the data in the queue,
* shrink the buffer size to match.
*/
if ((DWORD) bufSize > stat.cbInQue) {
bufSize = stat.cbInQue;
}
infoPtr->readFlags &= ~SERIAL_EXTRABYTE;
buf++;
bufSize--;
bytesRead = 1;
if (result == 0) {
} else {
if (infoPtr->flags & SERIAL_ASYNC) {
errno = *errorCode = EAGAIN;
return -1;
return bytesRead;
} else {
bufSize = 1;
}
}
}
}
}
if (ReadFile(infoPtr->handle, (LPVOID) buf, (DWORD) bufSize, &bytesRead,
NULL) == FALSE) {
err = GetLastError();
if (err != ERROR_IO_PENDING) {
goto error;
}
}
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static int
WaitForRead(
SerialInfo *infoPtr, /* Serial state. */
int blocking) /* Indicates whether call should be
* blocking or not. */
{
DWORD timeout, err, mask;
DWORD timeout, errors;
HANDLE *handle = infoPtr->handle;
COMSTAT stat;
/*
* Synchronize with the reader thread.
*/
timeout = blocking ? INFINITE : 0;
if (WaitForSingleObject(infoPtr->readable, timeout) == WAIT_TIMEOUT) {
/*
* The reader thread is blocked waiting for data and the channel
* is in non-blocking mode.
*/
errno = EAGAIN;
return -1;
}
/*
* At this point, the two threads are synchronized, so it is safe
* to access shared state. This code is not called in the ReaderThread
* in blocking mode, so it needs to be checked here.
*/
while (1) {
/*
* Synchronize with the reader thread.
*/
timeout = blocking ? INFINITE : 0;
if (WaitForSingleObject(infoPtr->readable, timeout) == WAIT_TIMEOUT) {
/*
* The reader thread is blocked waiting for data and the channel
* is in non-blocking mode.
*/
errno = EAGAIN;
return -1;
}
/*
* At this point, the two threads are synchronized, so it is safe
* to access shared state. This code is not called in the ReaderThread
* in blocking mode, so it needs to be checked here.
*/
/*
* If the serial has hit EOF, it is always readable.
*/
while (1) {
if (WaitCommEvent(handle, &mask, NULL) == FALSE) {
err = GetLastError();
infoPtr->readFlags |= SERIAL_EOF;
break;
if (infoPtr->readFlags & SERIAL_EOF) {
return 1;
}
if (ClearCommError(infoPtr->handle, &errors, &stat)) {
/*
* If there are errors, then signal an I/O error.
*/
if (errors != 0) {
errno = EIO;
return -1;
}
}
/*
* If data is in the queue return 1
*/
if (stat.cbInQue != 0) {
return 1;
}
if (mask & EV_RXCHAR) {
break;
/*
* if there is an extra byte that was consumed while
* waiting, but no data in the queue, return 0
*/
if (infoPtr->readFlags & SERIAL_EXTRABYTE) {
return 0;
}
ResetEvent(infoPtr->readable);
SetEvent(infoPtr->startReader);
}
/*
* If the serial has hit EOF, it is always readable.
*/
if (infoPtr->readFlags & SERIAL_EOF) {
return 1;
}
return 1;
}
/*
*----------------------------------------------------------------------
*
* SerialReaderThread --
*
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static DWORD WINAPI
SerialReaderThread(LPVOID arg)
{
SerialInfo *infoPtr = (SerialInfo *)arg;
HANDLE *handle = infoPtr->handle;
DWORD mask = EV_RXCHAR;
DWORD count;
for (;;) {
/*
* Wait for the main thread to signal before attempting to wait.
*/
WaitForSingleObject(infoPtr->startReader, INFINITE);
/*
* Try waiting for a Comm event.
*/
WaitCommEvent(handle, NULL, NULL);
while (1) {
if (WaitCommEvent(handle, &mask, NULL) == FALSE) {
/*
* There is an error, signal an EOF.
*/
infoPtr->readFlags |= SERIAL_EOF;
/*
* try to read one byte
*/
if (ReadFile(handle, &(infoPtr->extraByte), 1, &count, NULL)
!= FALSE) {
/*
* one byte was consumed while waiting to read, keep it
*/
if (count != 0) {
infoPtr->readFlags |= SERIAL_EXTRABYTE;
}
} else {
/*
* There is an error, signal an EOF.
*/
infoPtr->readFlags |= SERIAL_EOF;
break;
}
}
/*
* Signal the main thread by signalling the readable event and
* then waking up the notifier thread.
*/
/*
* Signal the main thread by signalling the readable event and
* then waking up the notifier thread.
*/
if (mask & EV_RXCHAR) {
SetEvent(infoPtr->readable);
Tcl_ThreadAlert(infoPtr->threadId);
SetEvent(infoPtr->readable);
Tcl_ThreadAlert(infoPtr->threadId);
break;
}
}
}
return 0; /* NOT REACHED */
}
/*
*----------------------------------------------------------------------
*
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tsdPtr = SerialInit();
SetCommMask(handle, EV_RXCHAR);
SetupComm(handle, 4096, 4096);
PurgeComm(handle, PURGE_TXABORT | PURGE_RXABORT | PURGE_TXCLEAR
| PURGE_RXCLEAR);
cto.ReadIntervalTimeout = MAXDWORD;
cto.ReadTotalTimeoutMultiplier = 0;
cto.ReadTotalTimeoutConstant = 0;
cto.ReadTotalTimeoutMultiplier = MAXDWORD;
cto.ReadTotalTimeoutConstant = 1;
cto.WriteTotalTimeoutMultiplier = 0;
cto.WriteTotalTimeoutConstant = 0;
SetCommTimeouts(handle, &cto);
infoPtr = (SerialInfo *) ckalloc((unsigned) sizeof(SerialInfo));
memset(infoPtr, 0, sizeof(SerialInfo));
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