Attachment "tclWinChan.c" to
ticket [1593707fff]
added by
melbardis
2006-11-10 02:35:53.
/*
* tclWinChan.c
*
* Channel drivers for Windows channels based on files, command pipes and
* TCP sockets.
*
* Copyright (c) 1995-1997 Sun Microsystems, Inc.
*
* See the file "license.terms" for information on usage and redistribution of
* this file, and for a DISCLAIMER OF ALL WARRANTIES.
*
* RCS: @(#) $Id: tclWinChan.c 949 2005-12-27 23:19:41Z [email protected] $
*/
#include "tclWinInt.h"
#include "tclIO.h"
/*
* State flags used in the info structures below.
*/
#define FILE_PENDING (1<<0) /* Message is pending in the queue. */
#define FILE_ASYNC (1<<1) /* Channel is non-blocking. */
#define FILE_APPEND (1<<2) /* File is in append mode. */
#define FILE_TYPE_SERIAL (FILE_TYPE_PIPE+1)
#define FILE_TYPE_CONSOLE (FILE_TYPE_PIPE+2)
/*
* The following structure contains per-instance data for a file based channel.
*/
typedef struct FileInfo {
Tcl_Channel channel; /* Pointer to channel structure. */
int validMask; /* OR'ed combination of TCL_READABLE,
* TCL_WRITABLE, or TCL_EXCEPTION: indicates
* which operations are valid on the file. */
int watchMask; /* OR'ed combination of TCL_READABLE,
* TCL_WRITABLE, or TCL_EXCEPTION: indicates
* which events should be reported. */
int flags; /* State flags, see above for a list. */
HANDLE handle; /* Input/output file. */
struct FileInfo *nextPtr; /* Pointer to next registered file. */
int dirty; /* Boolean flag. Set if the OS may have data
* pending on the channel. */
} FileInfo;
typedef struct ThreadSpecificData {
/*
* List of all file channels currently open.
*/
FileInfo *firstFilePtr;
} ThreadSpecificData;
static Tcl_ThreadDataKey dataKey;
/*
* The following structure is what is added to the Tcl event queue when file
* events are generated.
*/
typedef struct FileEvent {
Tcl_Event header; /* Information that is standard for all
* events. */
FileInfo *infoPtr; /* Pointer to file info structure. Note that
* we still have to verify that the file
* exists before dereferencing this
* pointer. */
} FileEvent;
/*
* Static routines for this file:
*/
static int FileBlockProc(ClientData instanceData, int mode);
static void FileChannelExitHandler(ClientData clientData);
static void FileCheckProc(ClientData clientData, int flags);
static int FileCloseProc(ClientData instanceData,
Tcl_Interp *interp);
static int FileEventProc(Tcl_Event *evPtr, int flags);
static int FileGetHandleProc(ClientData instanceData,
int direction, ClientData *handlePtr);
static ThreadSpecificData *FileInit(void);
static int FileInputProc(ClientData instanceData, char *buf,
int toRead, int *errorCode);
static int FileOutputProc(ClientData instanceData,
CONST char *buf, int toWrite, int *errorCode);
static int FileSeekProc(ClientData instanceData, long offset,
int mode, int *errorCode);
static Tcl_WideInt FileWideSeekProc(ClientData instanceData,
Tcl_WideInt offset, int mode, int *errorCode);
static void FileSetupProc(ClientData clientData, int flags);
static void FileWatchProc(ClientData instanceData, int mask);
static void FileThreadActionProc(ClientData instanceData,
int action);
static int FileTruncateProc(ClientData instanceData,
Tcl_WideInt length);
/*
* This structure describes the channel type structure for file based IO.
*/
static Tcl_ChannelType fileChannelType = {
"file", /* Type name. */
TCL_CHANNEL_VERSION_4, /* v4 channel */
FileCloseProc, /* Close proc. */
FileInputProc, /* Input proc. */
FileOutputProc, /* Output proc. */
FileSeekProc, /* Seek proc. */
NULL, /* Set option proc. */
NULL, /* Get option proc. */
FileWatchProc, /* Set up the notifier to watch the channel. */
FileGetHandleProc, /* Get an OS handle from channel. */
NULL, /* close2proc. */
FileBlockProc, /* Set blocking or non-blocking mode.*/
NULL, /* flush proc. */
NULL, /* handler proc. */
FileWideSeekProc, /* Wide seek proc. */
FileThreadActionProc, /* Thread action proc. */
FileTruncateProc, /* Truncate proc. */
};
#ifdef HAVE_NO_SEH
/*
* Unlike Borland and Microsoft, we don't register exception handlers by
* pushing registration records onto the runtime stack. Instead, we register
* them by creating an EXCEPTION_REGISTRATION within the activation record.
*/
typedef struct EXCEPTION_REGISTRATION {
struct EXCEPTION_REGISTRATION* link;
EXCEPTION_DISPOSITION (*handler)(
struct _EXCEPTION_RECORD*, void*, struct _CONTEXT*, void*);
void* ebp;
void* esp;
int status;
} EXCEPTION_REGISTRATION;
#endif
/*
*----------------------------------------------------------------------
*
* FileInit --
*
* This function creates the window used to simulate file events.
*
* Results:
* None.
*
* Side effects:
* Creates a new window and creates an exit handler.
*
*----------------------------------------------------------------------
*/
static ThreadSpecificData *
FileInit(void)
{
ThreadSpecificData *tsdPtr =
(ThreadSpecificData *)TclThreadDataKeyGet(&dataKey);
if (tsdPtr == NULL) {
tsdPtr = TCL_TSD_INIT(&dataKey);
tsdPtr->firstFilePtr = NULL;
Tcl_CreateEventSource(FileSetupProc, FileCheckProc, NULL);
Tcl_CreateThreadExitHandler(FileChannelExitHandler, NULL);
}
return tsdPtr;
}
/*
*----------------------------------------------------------------------
*
* FileChannelExitHandler --
*
* This function is called to cleanup the channel driver before Tcl is
* unloaded.
*
* Results:
* None.
*
* Side effects:
* Destroys the communication window.
*
*----------------------------------------------------------------------
*/
static void
FileChannelExitHandler(
ClientData clientData) /* Old window proc */
{
Tcl_DeleteEventSource(FileSetupProc, FileCheckProc, NULL);
}
/*
*----------------------------------------------------------------------
*
* FileSetupProc --
*
* This function is invoked before Tcl_DoOneEvent blocks waiting for an
* event.
*
* Results:
* None.
*
* Side effects:
* Adjusts the block time if needed.
*
*----------------------------------------------------------------------
*/
void
FileSetupProc(
ClientData data, /* Not used. */
int flags) /* Event flags as passed to Tcl_DoOneEvent. */
{
FileInfo *infoPtr;
Tcl_Time blockTime = { 0, 0 };
ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&dataKey);
if (!(flags & TCL_FILE_EVENTS)) {
return;
}
/*
* Check to see if there is a ready file. If so, poll.
*/
for (infoPtr = tsdPtr->firstFilePtr; infoPtr != NULL;
infoPtr = infoPtr->nextPtr) {
if (infoPtr->watchMask) {
Tcl_SetMaxBlockTime(&blockTime);
break;
}
}
}
/*
*----------------------------------------------------------------------
*
* FileCheckProc --
*
* This function is called by Tcl_DoOneEvent to check the file event
* source for events.
*
* Results:
* None.
*
* Side effects:
* May queue an event.
*
*----------------------------------------------------------------------
*/
static void
FileCheckProc(
ClientData data, /* Not used. */
int flags) /* Event flags as passed to Tcl_DoOneEvent. */
{
FileEvent *evPtr;
FileInfo *infoPtr;
ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&dataKey);
if (!(flags & TCL_FILE_EVENTS)) {
return;
}
/*
* Queue events for any ready files that don't already have events queued
* (caused by persistent states that won't generate WinSock events).
*/
for (infoPtr = tsdPtr->firstFilePtr; infoPtr != NULL;
infoPtr = infoPtr->nextPtr) {
if (infoPtr->watchMask && !(infoPtr->flags & FILE_PENDING)) {
infoPtr->flags |= FILE_PENDING;
evPtr = (FileEvent *) ckalloc(sizeof(FileEvent));
evPtr->header.proc = FileEventProc;
evPtr->infoPtr = infoPtr;
Tcl_QueueEvent((Tcl_Event *) evPtr, TCL_QUEUE_TAIL);
}
}
}
/*
*----------------------------------------------------------------------
*
* FileEventProc --
*
* This function is invoked by Tcl_ServiceEvent when a file event reaches
* the front of the event queue. This function invokes Tcl_NotifyChannel
* on the file.
*
* Results:
* Returns 1 if the event was handled, meaning it should be removed from
* the queue. Returns 0 if the event was not handled, meaning it should
* stay on the queue. The only time the event isn't handled is if the
* TCL_FILE_EVENTS flag bit isn't set.
*
* Side effects:
* Whatever the notifier callback does.
*
*----------------------------------------------------------------------
*/
static int
FileEventProc(
Tcl_Event *evPtr, /* Event to service. */
int flags) /* Flags that indicate what events to handle,
* such as TCL_FILE_EVENTS. */
{
FileEvent *fileEvPtr = (FileEvent *)evPtr;
FileInfo *infoPtr;
ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&dataKey);
if (!(flags & TCL_FILE_EVENTS)) {
return 0;
}
/*
* Search through the list of watched files for the one whose handle
* matches the event. We do this rather than simply dereferencing the
* handle in the event so that files can be deleted while the event is in
* the queue.
*/
for (infoPtr = tsdPtr->firstFilePtr; infoPtr != NULL;
infoPtr = infoPtr->nextPtr) {
if (fileEvPtr->infoPtr == infoPtr) {
infoPtr->flags &= ~(FILE_PENDING);
Tcl_NotifyChannel(infoPtr->channel, infoPtr->watchMask);
break;
}
}
return 1;
}
/*
*----------------------------------------------------------------------
*
* FileBlockProc --
*
* Set blocking or non-blocking mode on channel.
*
* Results:
* 0 if successful, errno when failed.
*
* Side effects:
* Sets the device into blocking or non-blocking mode.
*
*----------------------------------------------------------------------
*/
static int
FileBlockProc(
ClientData instanceData, /* Instance data for channel. */
int mode) /* TCL_MODE_BLOCKING or
* TCL_MODE_NONBLOCKING. */
{
FileInfo *infoPtr = (FileInfo *) instanceData;
/*
* Files on Windows can not be switched between blocking and nonblocking,
* hence we have to emulate the behavior. This is done in the input
* function by checking against a bit in the state. We set or unset the
* bit here to cause the input function to emulate the correct behavior.
*/
if (mode == TCL_MODE_NONBLOCKING) {
infoPtr->flags |= FILE_ASYNC;
} else {
infoPtr->flags &= ~(FILE_ASYNC);
}
return 0;
}
/*
*----------------------------------------------------------------------
*
* FileCloseProc --
*
* Closes the IO channel.
*
* Results:
* 0 if successful, the value of errno if failed.
*
* Side effects:
* Closes the physical channel
*
*----------------------------------------------------------------------
*/
static int
FileCloseProc(
ClientData instanceData, /* Pointer to FileInfo structure. */
Tcl_Interp *interp) /* Not used. */
{
FileInfo *fileInfoPtr = (FileInfo *) instanceData;
FileInfo *infoPtr;
ThreadSpecificData *tsdPtr;
int errorCode = 0;
/*
* Remove the file from the watch list.
*/
FileWatchProc(instanceData, 0);
/*
* Don't close the Win32 handle if the handle is a standard channel during
* the thread exit process. Otherwise, one thread may kill the stdio of
* another.
*/
if (!TclInThreadExit()
|| ((GetStdHandle(STD_INPUT_HANDLE) != fileInfoPtr->handle)
&& (GetStdHandle(STD_OUTPUT_HANDLE) != fileInfoPtr->handle)
&& (GetStdHandle(STD_ERROR_HANDLE) != fileInfoPtr->handle))) {
if (CloseHandle(fileInfoPtr->handle) == FALSE) {
TclWinConvertError(GetLastError());
errorCode = errno;
}
}
/*
* See if this FileInfo* is still on the thread local list.
*/
tsdPtr = TCL_TSD_INIT(&dataKey);
for (infoPtr = tsdPtr->firstFilePtr; infoPtr != NULL;
infoPtr = infoPtr->nextPtr) {
if (infoPtr == fileInfoPtr) {
/*
* This channel exists on the thread local list. It should have
* been removed by an earlier Threadaction call, but do that now
* since just deallocating fileInfoPtr would leave an deallocated
* pointer on the thread local list.
*/
FileThreadActionProc(fileInfoPtr,TCL_CHANNEL_THREAD_REMOVE);
break;
}
}
ckfree((char *)fileInfoPtr);
return errorCode;
}
/*
*----------------------------------------------------------------------
*
* FileSeekProc --
*
* Seeks on a file-based channel. Returns the new position.
*
* Results:
* -1 if failed, the new position if successful. If failed, it also sets
* *errorCodePtr to the error code.
*
* Side effects:
* Moves the location at which the channel will be accessed in future
* operations.
*
*----------------------------------------------------------------------
*/
static int
FileSeekProc(
ClientData instanceData, /* File state. */
long offset, /* Offset to seek to. */
int mode, /* Relative to where should we seek? */
int *errorCodePtr) /* To store error code. */
{
FileInfo *infoPtr = (FileInfo *) instanceData;
LONG newPos, newPosHigh, oldPos, oldPosHigh;
DWORD moveMethod;
*errorCodePtr = 0;
if (mode == SEEK_SET) {
moveMethod = FILE_BEGIN;
} else if (mode == SEEK_CUR) {
moveMethod = FILE_CURRENT;
} else {
moveMethod = FILE_END;
}
/*
* Save our current place in case we need to roll-back the seek.
*/
oldPosHigh = 0;
oldPos = SetFilePointer(infoPtr->handle, 0, &oldPosHigh, FILE_CURRENT);
if (oldPos == INVALID_SET_FILE_POINTER) {
DWORD winError = GetLastError();
if (winError != NO_ERROR) {
TclWinConvertError(winError);
*errorCodePtr = errno;
return -1;
}
}
newPosHigh = (offset < 0 ? -1 : 0);
newPos = SetFilePointer(infoPtr->handle, offset, &newPosHigh, moveMethod);
if (newPos == INVALID_SET_FILE_POINTER) {
DWORD winError = GetLastError();
if (winError != NO_ERROR) {
TclWinConvertError(winError);
*errorCodePtr = errno;
return -1;
}
}
/*
* Check for expressability in our return type, and roll-back otherwise.
*/
if (newPosHigh != 0) {
*errorCodePtr = EOVERFLOW;
SetFilePointer(infoPtr->handle, oldPos, &oldPosHigh, FILE_BEGIN);
return -1;
}
return (int) newPos;
}
/*
*----------------------------------------------------------------------
*
* FileWideSeekProc --
*
* Seeks on a file-based channel. Returns the new position.
*
* Results:
* -1 if failed, the new position if successful. If failed, it also sets
* *errorCodePtr to the error code.
*
* Side effects:
* Moves the location at which the channel will be accessed in future
* operations.
*
*----------------------------------------------------------------------
*/
static Tcl_WideInt
FileWideSeekProc(
ClientData instanceData, /* File state. */
Tcl_WideInt offset, /* Offset to seek to. */
int mode, /* Relative to where should we seek? */
int *errorCodePtr) /* To store error code. */
{
FileInfo *infoPtr = (FileInfo *) instanceData;
DWORD moveMethod;
LONG newPos, newPosHigh;
*errorCodePtr = 0;
if (mode == SEEK_SET) {
moveMethod = FILE_BEGIN;
} else if (mode == SEEK_CUR) {
moveMethod = FILE_CURRENT;
} else {
moveMethod = FILE_END;
}
newPosHigh = Tcl_WideAsLong(offset >> 32);
newPos = SetFilePointer(infoPtr->handle, Tcl_WideAsLong(offset),
&newPosHigh, moveMethod);
if (newPos == INVALID_SET_FILE_POINTER) {
DWORD winError = GetLastError();
if (winError != NO_ERROR) {
TclWinConvertError(winError);
*errorCodePtr = errno;
return -1;
}
}
return (Tcl_LongAsWide(newPos) | (Tcl_LongAsWide(newPosHigh) << 32));
}
/*
*----------------------------------------------------------------------
*
* FileTruncateProc --
*
* Truncates a file-based channel. Returns the error code.
*
* Results:
* 0 if successful, POSIX-y error code if it failed.
*
* Side effects:
* Truncates the file, may move file pointers too.
*
*----------------------------------------------------------------------
*/
static int
FileTruncateProc(
ClientData instanceData, /* File state. */
Tcl_WideInt length) /* Length to truncate at. */
{
FileInfo *infoPtr = (FileInfo *) instanceData;
LONG newPos, newPosHigh, oldPos, oldPosHigh;
/*
* Save where we were...
*/
oldPosHigh = 0;
oldPos = SetFilePointer(infoPtr->handle, 0, &oldPosHigh, FILE_CURRENT);
if (oldPos == INVALID_SET_FILE_POINTER) {
DWORD winError = GetLastError();
if (winError != NO_ERROR) {
TclWinConvertError(winError);
return errno;
}
}
/*
* Move to where we want to truncate
*/
newPosHigh = Tcl_WideAsLong(length >> 32);
newPos = SetFilePointer(infoPtr->handle, Tcl_WideAsLong(length),
&newPosHigh, FILE_BEGIN);
if (newPos == INVALID_SET_FILE_POINTER) {
DWORD winError = GetLastError();
if (winError != NO_ERROR) {
TclWinConvertError(winError);
return errno;
}
}
/*
* Perform the truncation (unlike POSIX ftruncate(), we needed to move to
* the location to truncate at first).
*/
if (!SetEndOfFile(infoPtr->handle)) {
TclWinConvertError(GetLastError());
return errno;
}
/*
* Move back. If this last step fails, we don't care; it's just a "best
* effort" attempt to restore our file pointer to where it was.
*/
SetFilePointer(infoPtr->handle, oldPos, &oldPosHigh, FILE_BEGIN);
return 0;
}
/*
*----------------------------------------------------------------------
*
* FileInputProc --
*
* Reads input from the IO channel into the buffer given. Returns count
* of how many bytes were actually read, and an error indication.
*
* Results:
* A count of how many bytes were read is returned and an error
* indication is returned in an output argument.
*
* Side effects:
* Reads input from the actual channel.
*
*----------------------------------------------------------------------
*/
static int
FileInputProc(
ClientData instanceData, /* File state. */
char *buf, /* Where to store data read. */
int bufSize, /* Num bytes available in buffer. */
int *errorCode) /* Where to store error code. */
{
FileInfo *infoPtr;
DWORD bytesRead;
*errorCode = 0;
infoPtr = (FileInfo *) instanceData;
/*
* Note that we will block on reads from a console buffer until a full
* line has been entered. The only way I know of to get around this is to
* write a console driver. We should probably do this at some point, but
* for now, we just block. The same problem exists for files being read
* over the network.
*/
if (ReadFile(infoPtr->handle, (LPVOID) buf, (DWORD) bufSize, &bytesRead,
(LPOVERLAPPED) NULL) != FALSE) {
return bytesRead;
}
TclWinConvertError(GetLastError());
*errorCode = errno;
if (errno == EPIPE) {
return 0;
}
return -1;
}
/*
*----------------------------------------------------------------------
*
* FileOutputProc --
*
* Writes the given output on the IO channel. Returns count of how many
* characters were actually written, and an error indication.
*
* Results:
* A count of how many characters were written is returned and an error
* indication is returned in an output argument.
*
* Side effects:
* Writes output on the actual channel.
*
*----------------------------------------------------------------------
*/
static int
FileOutputProc(
ClientData instanceData, /* File state. */
CONST char *buf, /* The data buffer. */
int toWrite, /* How many bytes to write? */
int *errorCode) /* Where to store error code. */
{
FileInfo *infoPtr = (FileInfo *) instanceData;
DWORD bytesWritten;
*errorCode = 0;
/*
* If we are writing to a file that was opened with O_APPEND, we need to
* seek to the end of the file before writing the current buffer.
*/
if (infoPtr->flags & FILE_APPEND) {
SetFilePointer(infoPtr->handle, 0, NULL, FILE_END);
}
if (WriteFile(infoPtr->handle, (LPVOID) buf, (DWORD) toWrite,
&bytesWritten, (LPOVERLAPPED) NULL) == FALSE) {
TclWinConvertError(GetLastError());
*errorCode = errno;
return -1;
}
infoPtr->dirty = 1;
return bytesWritten;
}
/*
*----------------------------------------------------------------------
*
* FileWatchProc --
*
* Called by the notifier to set up to watch for events on this channel.
*
* Results:
* None.
*
* Side effects:
* None.
*
*----------------------------------------------------------------------
*/
static void
FileWatchProc(
ClientData instanceData, /* File state. */
int mask) /* What events to watch for; OR-ed combination
* of TCL_READABLE, TCL_WRITABLE and
* TCL_EXCEPTION. */
{
FileInfo *infoPtr = (FileInfo *) instanceData;
Tcl_Time blockTime = { 0, 0 };
/*
* Since the file is always ready for events, we set the block time to
* zero so we will poll.
*/
infoPtr->watchMask = mask & infoPtr->validMask;
if (infoPtr->watchMask) {
Tcl_SetMaxBlockTime(&blockTime);
}
}
/*
*----------------------------------------------------------------------
*
* FileGetHandleProc --
*
* Called from Tcl_GetChannelHandle to retrieve OS handles from a file
* based channel.
*
* Results:
* Returns TCL_OK with the fd in handlePtr, or TCL_ERROR if there is no
* handle for the specified direction.
*
* Side effects:
* None.
*
*----------------------------------------------------------------------
*/
static int
FileGetHandleProc(
ClientData instanceData, /* The file state. */
int direction, /* TCL_READABLE or TCL_WRITABLE */
ClientData *handlePtr) /* Where to store the handle. */
{
FileInfo *infoPtr = (FileInfo *) instanceData;
if (direction & infoPtr->validMask) {
*handlePtr = (ClientData) infoPtr->handle;
return TCL_OK;
} else {
return TCL_ERROR;
}
}
/*
*----------------------------------------------------------------------
*
* TclpOpenFileChannel --
*
* Open an File based channel on Unix systems.
*
* Results:
* The new channel or NULL. If NULL, the output argument errorCodePtr is
* set to a POSIX error.
*
* Side effects:
* May open the channel and may cause creation of a file on the file
* system.
*
*----------------------------------------------------------------------
*/
Tcl_Channel
TclpOpenFileChannel(
Tcl_Interp *interp, /* Interpreter for error reporting; can be
* NULL. */
Tcl_Obj *pathPtr, /* Name of file to open. */
int mode, /* POSIX mode. */
int permissions) /* If the open involves creating a file, with
* what modes to create it? */
{
Tcl_Channel channel = 0;
int channelPermissions = 0;
DWORD accessMode = 0, createMode, shareMode, flags, consoleParams, type;
CONST TCHAR *nativeName;
HANDLE handle;
char channelName[16 + TCL_INTEGER_SPACE];
TclFile readFile = NULL, writeFile = NULL;
nativeName = (TCHAR*) Tcl_FSGetNativePath(pathPtr);
if (nativeName == NULL) {
return NULL;
}
switch (mode & (O_RDONLY | O_WRONLY | O_RDWR)) {
case O_RDONLY:
accessMode = GENERIC_READ;
channelPermissions = TCL_READABLE;
break;
case O_WRONLY:
accessMode = GENERIC_WRITE;
channelPermissions = TCL_WRITABLE;
break;
case O_RDWR:
accessMode = (GENERIC_READ | GENERIC_WRITE);
channelPermissions = (TCL_READABLE | TCL_WRITABLE);
break;
default:
Tcl_Panic("TclpOpenFileChannel: invalid mode value");
break;
}
/*
* Map the creation flags to the NT create mode.
*/
switch (mode & (O_CREAT | O_EXCL | O_TRUNC)) {
case (O_CREAT | O_EXCL):
case (O_CREAT | O_EXCL | O_TRUNC):
createMode = CREATE_NEW;
break;
case (O_CREAT | O_TRUNC):
createMode = CREATE_ALWAYS;
break;
case O_CREAT:
createMode = OPEN_ALWAYS;
break;
case O_TRUNC:
case (O_TRUNC | O_EXCL):
createMode = TRUNCATE_EXISTING;
break;
default:
createMode = OPEN_EXISTING;
break;
}
/*
* If the file is being created, get the file attributes from the
* permissions argument, else use the existing file attributes.
*/
if (mode & O_CREAT) {
if (permissions & S_IWRITE) {
flags = FILE_ATTRIBUTE_NORMAL;
} else {
flags = FILE_ATTRIBUTE_READONLY;
}
} else {
flags = (*tclWinProcs->getFileAttributesProc)(nativeName);
if (flags == 0xFFFFFFFF) {
flags = 0;
}
}
/*
* Set up the file sharing mode. We want to allow simultaneous access.
*/
shareMode = FILE_SHARE_READ | FILE_SHARE_WRITE;
/*
* Now we get to create the file.
*/
{
//EPM - windows can screwup when opening same file at same time
int retry = 5;
int err;
while (retry--) {
handle = (*tclWinProcs->createFileProc)(nativeName, accessMode,
shareMode, NULL, createMode, flags, (HANDLE) NULL);
if (handle != INVALID_HANDLE_VALUE) {
break;
}
err = GetLastError();
if (err == ERROR_FILE_NOT_FOUND) {
// File removed by external circumstances.
break;
}
Sleep(100);
//printf("retry... %d\n", retry);
}
}
if (handle == INVALID_HANDLE_VALUE) {
DWORD err = GetLastError();
//printf("*********ERROR***********: err=0x%08x\n", err);
//printf("EPM: tclWinChan.c: name=%S s=%d c=%d a=0x%08x f=0x%08x \n",
// nativeName, shareMode, createMode, accessMode, flags);
if ((err & 0xffffL) == ERROR_OPEN_FAILED) {
err = (mode & O_CREAT) ? ERROR_FILE_EXISTS : ERROR_FILE_NOT_FOUND;
}
TclWinConvertError(err);
if (interp != (Tcl_Interp *) NULL) {
Tcl_AppendResult(interp, "couldn't open \"", TclGetString(pathPtr),
"\": ", Tcl_PosixError(interp), NULL);
}
return NULL;
}
type = GetFileType(handle);
/*
* If the file is a character device, we need to try to figure out whether
* it is a serial port, a console, or something else. We test for the
* console case first because this is more common.
*/
if (type == FILE_TYPE_CHAR) {
if (GetConsoleMode(handle, &consoleParams)) {
type = FILE_TYPE_CONSOLE;
} else {
DCB dcb;
dcb.DCBlength = sizeof(DCB);
if (GetCommState(handle, &dcb)) {
type = FILE_TYPE_SERIAL;
}
}
}
channel = NULL;
switch (type) {
case FILE_TYPE_SERIAL:
/*
* Reopen channel for OVERLAPPED operation. Normally this shouldn't
* fail, because the channel exists.
*/
handle = TclWinSerialReopen(handle, nativeName, accessMode);
if (handle == INVALID_HANDLE_VALUE) {
TclWinConvertError(GetLastError());
if (interp != (Tcl_Interp *) NULL) {
Tcl_AppendResult(interp, "couldn't reopen serial \"",
TclGetString(pathPtr), "\": ",
Tcl_PosixError(interp), NULL);
}
return NULL;
}
channel = TclWinOpenSerialChannel(handle, channelName,
channelPermissions);
break;
case FILE_TYPE_CONSOLE:
channel = TclWinOpenConsoleChannel(handle, channelName,
channelPermissions);
break;
case FILE_TYPE_PIPE:
if (channelPermissions & TCL_READABLE) {
readFile = TclWinMakeFile(handle);
}
if (channelPermissions & TCL_WRITABLE) {
writeFile = TclWinMakeFile(handle);
}
channel = TclpCreateCommandChannel(readFile, writeFile, NULL, 0, NULL);
break;
case FILE_TYPE_CHAR:
case FILE_TYPE_DISK:
case FILE_TYPE_UNKNOWN:
channel = TclWinOpenFileChannel(handle, channelName,
channelPermissions, (mode & O_APPEND) ? FILE_APPEND : 0);
break;
default:
/*
* The handle is of an unknown type, probably /dev/nul equivalent or
* possibly a closed handle.
*/
channel = NULL;
Tcl_AppendResult(interp, "couldn't open \"", TclGetString(pathPtr),
"\": bad file type", NULL);
break;
}
return channel;
}
/*
*----------------------------------------------------------------------
*
* Tcl_MakeFileChannel --
*
* Creates a Tcl_Channel from an existing platform specific file handle.
*
* Results:
* The Tcl_Channel created around the preexisting file.
*
* Side effects:
* None.
*
*----------------------------------------------------------------------
*/
Tcl_Channel
Tcl_MakeFileChannel(
ClientData rawHandle, /* OS level handle */
int mode) /* ORed combination of TCL_READABLE and
* TCL_WRITABLE to indicate file mode. */
{
#ifdef HAVE_NO_SEH
EXCEPTION_REGISTRATION registration;
#endif
char channelName[16 + TCL_INTEGER_SPACE];
Tcl_Channel channel = NULL;
HANDLE handle = (HANDLE) rawHandle;
HANDLE dupedHandle;
DWORD consoleParams, type;
TclFile readFile = NULL, writeFile = NULL;
BOOL result;
if (mode == 0) {
return NULL;
}
/*
* GetFileType() returns FILE_TYPE_UNKNOWN for invalid handles.
*/
type = GetFileType(handle);
/*
* If the file is a character device, we need to try to figure out whether
* it is a serial port, a console, or something else. We test for the
* console case first because this is more common.
*/
if (type == FILE_TYPE_CHAR) {
if (GetConsoleMode(handle, &consoleParams)) {
type = FILE_TYPE_CONSOLE;
} else {
DCB dcb;
dcb.DCBlength = sizeof(DCB);
if (GetCommState(handle, &dcb)) {
type = FILE_TYPE_SERIAL;
}
}
}
switch (type) {
case FILE_TYPE_SERIAL:
channel = TclWinOpenSerialChannel(handle, channelName, mode);
break;
case FILE_TYPE_CONSOLE:
channel = TclWinOpenConsoleChannel(handle, channelName, mode);
break;
case FILE_TYPE_PIPE:
if (mode & TCL_READABLE) {
readFile = TclWinMakeFile(handle);
}
if (mode & TCL_WRITABLE) {
writeFile = TclWinMakeFile(handle);
}
channel = TclpCreateCommandChannel(readFile, writeFile, NULL, 0, NULL);
break;
case FILE_TYPE_DISK:
case FILE_TYPE_CHAR:
channel = TclWinOpenFileChannel(handle, channelName, mode, 0);
break;
case FILE_TYPE_UNKNOWN:
default:
/*
* The handle is of an unknown type. Test the validity of this OS
* handle by duplicating it, then closing the dupe. The Win32 API
* doesn't provide an IsValidHandle() function, so we have to emulate
* it here. This test will not work on a console handle reliably,
* which is why we can't test every handle that comes into this
* function in this way.
*/
result = DuplicateHandle(GetCurrentProcess(), handle,
GetCurrentProcess(), &dupedHandle, 0, FALSE,
DUPLICATE_SAME_ACCESS);
if (result == 0) {
/*
* Unable to make a duplicate. It's definately invalid at this
* point.
*/
return NULL;
}
/*
* Use structured exception handling (Win32 SEH) to protect the close
* of this duped handle which might throw EXCEPTION_INVALID_HANDLE.
*/
result = 0;
#ifndef HAVE_NO_SEH
__try {
CloseHandle(dupedHandle);
result = 1;
} __except (EXCEPTION_EXECUTE_HANDLER) {}
#else
/*
* Don't have SEH available, do things the hard way. Note that this
* needs to be one block of asm, to avoid stack imbalance; also, it is
* illegal for one asm block to contain a jump to another.
*/
__asm__ __volatile__ (
/*
* Pick up parameters before messing with the stack
*/
"movl %[dupedHandle], %%ebx" "\n\t"
/*
* Construct an EXCEPTION_REGISTRATION to protect the call to
* CloseHandle.
*/
"leal %[registration], %%edx" "\n\t"
"movl %%fs:0, %%eax" "\n\t"
"movl %%eax, 0x0(%%edx)" "\n\t" /* link */
"leal 1f, %%eax" "\n\t"
"movl %%eax, 0x4(%%edx)" "\n\t" /* handler */
"movl %%ebp, 0x8(%%edx)" "\n\t" /* ebp */
"movl %%esp, 0xc(%%edx)" "\n\t" /* esp */
"movl $0, 0x10(%%edx)" "\n\t" /* status */
/*
* Link the EXCEPTION_REGISTRATION on the chain.
*/
"movl %%edx, %%fs:0" "\n\t"
/*
* Call CloseHandle(dupedHandle).
*/
"pushl %%ebx" "\n\t"
"call _CloseHandle@4" "\n\t"
/*
* Come here on normal exit. Recover the EXCEPTION_REGISTRATION
* and put a TRUE status return into it.
*/
"movl %%fs:0, %%edx" "\n\t"
"movl $1, %%eax" "\n\t"
"movl %%eax, 0x10(%%edx)" "\n\t"
"jmp 2f" "\n"
/*
* Come here on an exception. Recover the EXCEPTION_REGISTRATION
*/
"1:" "\t"
"movl %%fs:0, %%edx" "\n\t"
"movl 0x8(%%edx), %%edx" "\n\t"
/*
* Come here however we exited. Restore context from the
* EXCEPTION_REGISTRATION in case the stack is unbalanced.
*/
"2:" "\t"
"movl 0xc(%%edx), %%esp" "\n\t"
"movl 0x8(%%edx), %%ebp" "\n\t"
"movl 0x0(%%edx), %%eax" "\n\t"
"movl %%eax, %%fs:0" "\n\t"
:
/* No outputs */
:
[registration] "m" (registration),
[dupedHandle] "m" (dupedHandle)
:
"%eax", "%ebx", "%ecx", "%edx", "%esi", "%edi", "memory"
);
result = registration.status;
#endif
if (result == FALSE) {
return NULL;
}
/*
* Fall through, the handle is valid.
*
* Create the undefined channel, anyways, because we know the handle
* is valid to something.
*/
channel = TclWinOpenFileChannel(handle, channelName, mode, 0);
}
return channel;
}
/*
*----------------------------------------------------------------------
*
* TclpGetDefaultStdChannel --
*
* Constructs a channel for the specified standard OS handle.
*
* Results:
* Returns the specified default standard channel, or NULL.
*
* Side effects:
* May cause the creation of a standard channel and the underlying file.
*
*----------------------------------------------------------------------
*/
Tcl_Channel
TclpGetDefaultStdChannel(
int type) /* One of TCL_STDIN, TCL_STDOUT, or
* TCL_STDERR. */
{
Tcl_Channel channel;
HANDLE handle;
int mode = -1;
char *bufMode = NULL;
DWORD handleId = (DWORD)INVALID_HANDLE_VALUE;
/* Standard handle to retrieve. */
switch (type) {
case TCL_STDIN:
handleId = STD_INPUT_HANDLE;
mode = TCL_READABLE;
bufMode = "line";
break;
case TCL_STDOUT:
handleId = STD_OUTPUT_HANDLE;
mode = TCL_WRITABLE;
bufMode = "line";
break;
case TCL_STDERR:
handleId = STD_ERROR_HANDLE;
mode = TCL_WRITABLE;
bufMode = "none";
break;
default:
Tcl_Panic("TclGetDefaultStdChannel: Unexpected channel type");
break;
}
handle = GetStdHandle(handleId);
/*
* Note that we need to check for 0 because Windows may return 0 if this
* is not a console mode application, even though this is not a valid
* handle.
*/
if ((handle == INVALID_HANDLE_VALUE) || (handle == 0)) {
return (Tcl_Channel) NULL;
}
channel = Tcl_MakeFileChannel(handle, mode);
if (channel == NULL) {
return (Tcl_Channel) NULL;
}
/*
* Set up the normal channel options for stdio handles.
*/
if (Tcl_SetChannelOption(NULL,channel,"-translation","auto")!=TCL_OK ||
Tcl_SetChannelOption(NULL,channel,"-eofchar","\032 {}")!=TCL_OK ||
Tcl_SetChannelOption(NULL,channel,"-buffering",bufMode)!=TCL_OK) {
Tcl_Close(NULL, channel);
return (Tcl_Channel) NULL;
}
return channel;
}
/*
*----------------------------------------------------------------------
*
* TclWinOpenFileChannel --
*
* Constructs a File channel for the specified standard OS handle. This
* is a helper function to break up the construction of channels into
* File, Console, or Serial.
*
* Results:
* Returns the new channel, or NULL.
*
* Side effects:
* May open the channel and may cause creation of a file on the file
* system.
*
*----------------------------------------------------------------------
*/
Tcl_Channel
TclWinOpenFileChannel(
HANDLE handle, /* Win32 HANDLE to swallow */
char *channelName, /* Buffer to receive channel name */
int permissions, /* OR'ed combination of TCL_READABLE,
* TCL_WRITABLE, or TCL_EXCEPTION, indicating
* which operations are valid on the file. */
int appendMode) /* OR'ed combination of bits indicating what
* additional configuration of the channel is
* present. */
{
FileInfo *infoPtr;
ThreadSpecificData *tsdPtr = FileInit();
/*
* See if a channel with this handle already exists.
*/
for (infoPtr = tsdPtr->firstFilePtr; infoPtr != NULL;
infoPtr = infoPtr->nextPtr) {
if (infoPtr->handle == (HANDLE) handle) {
return (permissions==infoPtr->validMask) ? infoPtr->channel : NULL;
}
}
infoPtr = (FileInfo *) ckalloc((unsigned) sizeof(FileInfo));
/*
* TIP #218. Removed the code inserting the new structure into the global
* list. This is now handled in the thread action callbacks, and only
* there.
*/
infoPtr->nextPtr = NULL;
infoPtr->validMask = permissions;
infoPtr->watchMask = 0;
infoPtr->flags = appendMode;
infoPtr->handle = handle;
infoPtr->dirty = 0;
wsprintfA(channelName, "file%lx", (int) infoPtr);
infoPtr->channel = Tcl_CreateChannel(&fileChannelType, channelName,
(ClientData) infoPtr, permissions);
/*
* Files have default translation of AUTO and ^Z eof char, which means
* that a ^Z will be accepted as EOF when reading.
*/
Tcl_SetChannelOption(NULL, infoPtr->channel, "-translation", "auto");
Tcl_SetChannelOption(NULL, infoPtr->channel, "-eofchar", "\032 {}");
return infoPtr->channel;
}
/*
*----------------------------------------------------------------------
*
* TclWinFlushDirtyChannels --
*
* Flush all dirty channels to disk, so that requesting the size of any
* file returns the correct value.
*
* Results:
* None.
*
* Side effects:
* Information is actually written to disk now, rather than later. Don't
* call this too often, or there will be a performance hit (i.e. only
* call when we need to ask for the size of a file).
*
*----------------------------------------------------------------------
*/
void
TclWinFlushDirtyChannels(void)
{
FileInfo *infoPtr;
ThreadSpecificData *tsdPtr = FileInit();
/*
* Flush all channels which are dirty, i.e. may have data pending in the
* OS.
*/
for (infoPtr = tsdPtr->firstFilePtr; infoPtr != NULL;
infoPtr = infoPtr->nextPtr) {
if (infoPtr->dirty) {
FlushFileBuffers(infoPtr->handle);
infoPtr->dirty = 0;
}
}
}
/*
*----------------------------------------------------------------------
*
* FileThreadActionProc --
*
* Insert or remove any thread local refs to this channel.
*
* Results:
* None.
*
* Side effects:
* Changes thread local list of valid channels.
*
*----------------------------------------------------------------------
*/
static void
FileThreadActionProc(
ClientData instanceData,
int action)
{
ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&dataKey);
FileInfo *infoPtr = (FileInfo *) instanceData;
if (action == TCL_CHANNEL_THREAD_INSERT) {
infoPtr->nextPtr = tsdPtr->firstFilePtr;
tsdPtr->firstFilePtr = infoPtr;
} else {
FileInfo **nextPtrPtr;
int removed = 0;
for (nextPtrPtr = &(tsdPtr->firstFilePtr); (*nextPtrPtr) != NULL;
nextPtrPtr = &((*nextPtrPtr)->nextPtr)) {
if ((*nextPtrPtr) == infoPtr) {
(*nextPtrPtr) = infoPtr->nextPtr;
removed = 1;
break;
}
}
/*
* This could happen if the channel was created in one thread and then
* moved to another without updating the thread local data in each
* thread.
*/
if (!removed) {
Tcl_Panic("file info ptr not on thread channel list");
}
}
}
/*
* Local Variables:
* mode: c
* c-basic-offset: 4
* fill-column: 78
* End:
*/
