1603 lines
41 KiB
C
1603 lines
41 KiB
C
/*
|
||
* tclWinChan.c
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*
|
||
* Channel drivers for Windows channels based on files, command pipes and
|
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* TCP sockets.
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*
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* Copyright (c) 1995-1997 Sun Microsystems, Inc.
|
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*
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||
* See the file "license.terms" for information on usage and redistribution of
|
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* this file, and for a DISCLAIMER OF ALL WARRANTIES.
|
||
*/
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||
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||
#include "tclWinInt.h"
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||
#include "tclIO.h"
|
||
|
||
/*
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||
* State flags used in the info structures below.
|
||
*/
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||
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||
#define FILE_PENDING (1<<0) /* Message is pending in the queue. */
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||
#define FILE_ASYNC (1<<1) /* Channel is non-blocking. */
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||
#define FILE_APPEND (1<<2) /* File is in append mode. */
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||
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#define FILE_TYPE_SERIAL (FILE_TYPE_PIPE+1)
|
||
#define FILE_TYPE_CONSOLE (FILE_TYPE_PIPE+2)
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||
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||
/*
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||
* The following structure contains per-instance data for a file based channel.
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||
*/
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||
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typedef struct FileInfo {
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Tcl_Channel channel; /* Pointer to channel structure. */
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||
int validMask; /* OR'ed combination of TCL_READABLE,
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* TCL_WRITABLE, or TCL_EXCEPTION: indicates
|
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* which operations are valid on the file. */
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||
int watchMask; /* OR'ed combination of TCL_READABLE,
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||
* TCL_WRITABLE, or TCL_EXCEPTION: indicates
|
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* which events should be reported. */
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int flags; /* State flags, see above for a list. */
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HANDLE handle; /* Input/output file. */
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struct FileInfo *nextPtr; /* Pointer to next registered file. */
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int dirty; /* Boolean flag. Set if the OS may have data
|
||
* pending on the channel. */
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||
} FileInfo;
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||
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||
typedef struct ThreadSpecificData {
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/*
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||
* List of all file channels currently open.
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||
*/
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||
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FileInfo *firstFilePtr;
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||
} ThreadSpecificData;
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||
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static Tcl_ThreadDataKey dataKey;
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/*
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||
* The following structure is what is added to the Tcl event queue when file
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||
* events are generated.
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||
*/
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typedef struct FileEvent {
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Tcl_Event header; /* Information that is standard for all
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* events. */
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||
FileInfo *infoPtr; /* Pointer to file info structure. Note that
|
||
* we still have to verify that the file
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* exists before dereferencing this
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* pointer. */
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} FileEvent;
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/*
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* Static routines for this file:
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*/
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static int FileBlockProc(ClientData instanceData, int mode);
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static void FileChannelExitHandler(ClientData clientData);
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static void FileCheckProc(ClientData clientData, int flags);
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static int FileCloseProc(ClientData instanceData,
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Tcl_Interp *interp);
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static int FileClose2Proc(ClientData instanceData,
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Tcl_Interp *interp, int flags);
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static int FileEventProc(Tcl_Event *evPtr, int flags);
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static int FileGetHandleProc(ClientData instanceData,
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int direction, ClientData *handlePtr);
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static ThreadSpecificData *FileInit(void);
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static int FileInputProc(ClientData instanceData, char *buf,
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int toRead, int *errorCode);
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static int FileOutputProc(ClientData instanceData,
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const char *buf, int toWrite, int *errorCode);
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static int FileSeekProc(ClientData instanceData, long offset,
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int mode, int *errorCode);
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static Tcl_WideInt FileWideSeekProc(ClientData instanceData,
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Tcl_WideInt offset, int mode, int *errorCode);
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static void FileSetupProc(ClientData clientData, int flags);
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static void FileWatchProc(ClientData instanceData, int mask);
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static void FileThreadActionProc(ClientData instanceData,
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int action);
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static int FileTruncateProc(ClientData instanceData,
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Tcl_WideInt length);
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static DWORD FileGetType(HANDLE handle);
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static int NativeIsComPort(const WCHAR *nativeName);
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/*
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* This structure describes the channel type structure for file based IO.
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*/
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static const Tcl_ChannelType fileChannelType = {
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"file", /* Type name. */
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TCL_CHANNEL_VERSION_5, /* v5 channel */
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FileCloseProc, /* Close proc. */
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FileInputProc, /* Input proc. */
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FileOutputProc, /* Output proc. */
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FileSeekProc, /* Seek proc. */
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NULL, /* Set option proc. */
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NULL, /* Get option proc. */
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FileWatchProc, /* Set up the notifier to watch the channel. */
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FileGetHandleProc, /* Get an OS handle from channel. */
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FileClose2Proc, /* close2proc. */
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FileBlockProc, /* Set blocking or non-blocking mode.*/
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NULL, /* flush proc. */
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NULL, /* handler proc. */
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FileWideSeekProc, /* Wide seek proc. */
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FileThreadActionProc, /* Thread action proc. */
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FileTruncateProc /* Truncate proc. */
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};
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/*
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*----------------------------------------------------------------------
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*
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* FileInit --
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*
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* This function creates the window used to simulate file events.
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*
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* Results:
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* None.
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*
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* Side effects:
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* Creates a new window and creates an exit handler.
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*
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*----------------------------------------------------------------------
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*/
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static ThreadSpecificData *
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FileInit(void)
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{
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ThreadSpecificData *tsdPtr =
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(ThreadSpecificData *)TclThreadDataKeyGet(&dataKey);
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if (tsdPtr == NULL) {
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tsdPtr = TCL_TSD_INIT(&dataKey);
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tsdPtr->firstFilePtr = NULL;
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Tcl_CreateEventSource(FileSetupProc, FileCheckProc, NULL);
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Tcl_CreateThreadExitHandler(FileChannelExitHandler, NULL);
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}
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return tsdPtr;
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}
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/*
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*----------------------------------------------------------------------
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*
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* FileChannelExitHandler --
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*
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* This function is called to cleanup the channel driver before Tcl is
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* unloaded.
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*
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* Results:
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* None.
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*
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* Side effects:
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* Destroys the communication window.
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*
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*----------------------------------------------------------------------
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*/
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static void
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FileChannelExitHandler(
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ClientData clientData) /* Old window proc */
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{
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Tcl_DeleteEventSource(FileSetupProc, FileCheckProc, NULL);
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}
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/*
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*----------------------------------------------------------------------
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*
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* FileSetupProc --
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*
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* This function is invoked before Tcl_DoOneEvent blocks waiting for an
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* event.
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*
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* Results:
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* None.
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*
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* Side effects:
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* Adjusts the block time if needed.
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*
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*----------------------------------------------------------------------
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*/
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void
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FileSetupProc(
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ClientData data, /* Not used. */
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int flags) /* Event flags as passed to Tcl_DoOneEvent. */
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{
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FileInfo *infoPtr;
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Tcl_Time blockTime = { 0, 0 };
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ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&dataKey);
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if (!(flags & TCL_FILE_EVENTS)) {
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return;
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}
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/*
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* Check to see if there is a ready file. If so, poll.
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*/
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for (infoPtr = tsdPtr->firstFilePtr; infoPtr != NULL;
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infoPtr = infoPtr->nextPtr) {
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if (infoPtr->watchMask) {
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Tcl_SetMaxBlockTime(&blockTime);
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break;
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}
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}
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}
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/*
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*----------------------------------------------------------------------
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*
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* FileCheckProc --
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*
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* This function is called by Tcl_DoOneEvent to check the file event
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* source for events.
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*
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* Results:
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* None.
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*
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* Side effects:
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* May queue an event.
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*
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*----------------------------------------------------------------------
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*/
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static void
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FileCheckProc(
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ClientData data, /* Not used. */
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int flags) /* Event flags as passed to Tcl_DoOneEvent. */
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{
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FileEvent *evPtr;
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FileInfo *infoPtr;
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ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&dataKey);
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if (!(flags & TCL_FILE_EVENTS)) {
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return;
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}
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/*
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* Queue events for any ready files that don't already have events queued
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* (caused by persistent states that won't generate WinSock events).
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*/
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for (infoPtr = tsdPtr->firstFilePtr; infoPtr != NULL;
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infoPtr = infoPtr->nextPtr) {
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if (infoPtr->watchMask && !(infoPtr->flags & FILE_PENDING)) {
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infoPtr->flags |= FILE_PENDING;
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evPtr = ckalloc(sizeof(FileEvent));
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evPtr->header.proc = FileEventProc;
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evPtr->infoPtr = infoPtr;
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Tcl_QueueEvent((Tcl_Event *) evPtr, TCL_QUEUE_TAIL);
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}
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}
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}
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/*
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*----------------------------------------------------------------------
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*
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* FileEventProc --
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*
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* This function is invoked by Tcl_ServiceEvent when a file event reaches
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* the front of the event queue. This function invokes Tcl_NotifyChannel
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* on the file.
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*
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* Results:
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* 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
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* stay on the queue. The only time the event isn't handled is if the
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* TCL_FILE_EVENTS flag bit isn't set.
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||
*
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* Side effects:
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||
* Whatever the notifier callback does.
|
||
*
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||
*----------------------------------------------------------------------
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||
*/
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static int
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FileEventProc(
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Tcl_Event *evPtr, /* Event to service. */
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int flags) /* Flags that indicate what events to handle,
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* such as TCL_FILE_EVENTS. */
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{
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FileEvent *fileEvPtr = (FileEvent *)evPtr;
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FileInfo *infoPtr;
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ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&dataKey);
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if (!(flags & TCL_FILE_EVENTS)) {
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return 0;
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}
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/*
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* Search through the list of watched files for the one whose handle
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* matches the event. We do this rather than simply dereferencing the
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* handle in the event so that files can be deleted while the event is in
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* the queue.
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*/
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for (infoPtr = tsdPtr->firstFilePtr; infoPtr != NULL;
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infoPtr = infoPtr->nextPtr) {
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if (fileEvPtr->infoPtr == infoPtr) {
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infoPtr->flags &= ~(FILE_PENDING);
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Tcl_NotifyChannel(infoPtr->channel, infoPtr->watchMask);
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break;
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}
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}
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return 1;
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}
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/*
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*----------------------------------------------------------------------
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*
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* FileBlockProc --
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*
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* Set blocking or non-blocking mode on channel.
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*
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* Results:
|
||
* 0 if successful, errno when failed.
|
||
*
|
||
* Side effects:
|
||
* Sets the device into blocking or non-blocking mode.
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*
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*----------------------------------------------------------------------
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*/
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static int
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FileBlockProc(
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||
ClientData instanceData, /* Instance data for channel. */
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||
int mode) /* TCL_MODE_BLOCKING or
|
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* TCL_MODE_NONBLOCKING. */
|
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{
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||
FileInfo *infoPtr = instanceData;
|
||
|
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/*
|
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* 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.
|
||
*/
|
||
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if (mode == TCL_MODE_NONBLOCKING) {
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||
infoPtr->flags |= FILE_ASYNC;
|
||
} else {
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||
infoPtr->flags &= ~(FILE_ASYNC);
|
||
}
|
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return 0;
|
||
}
|
||
|
||
/*
|
||
*----------------------------------------------------------------------
|
||
*
|
||
* FileCloseProc/FileClose2Proc --
|
||
*
|
||
* 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 = 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(fileInfoPtr);
|
||
return errorCode;
|
||
}
|
||
|
||
static int
|
||
FileClose2Proc(
|
||
ClientData instanceData, /* Pointer to FileInfo structure. */
|
||
Tcl_Interp *interp, /* Not used. */
|
||
int flags)
|
||
{
|
||
if ((flags & (TCL_CLOSE_READ | TCL_CLOSE_WRITE)) == 0) {
|
||
return FileCloseProc(instanceData, interp);
|
||
}
|
||
return EINVAL;
|
||
}
|
||
|
||
/*
|
||
*----------------------------------------------------------------------
|
||
*
|
||
* 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 = 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 == (LONG)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 == (LONG)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 = 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 == (LONG)INVALID_SET_FILE_POINTER) {
|
||
DWORD winError = GetLastError();
|
||
|
||
if (winError != NO_ERROR) {
|
||
TclWinConvertError(winError);
|
||
*errorCodePtr = errno;
|
||
return -1;
|
||
}
|
||
}
|
||
return (((Tcl_WideInt)((unsigned)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 = instanceData;
|
||
LONG newPos, newPosHigh, oldPos, oldPosHigh;
|
||
|
||
/*
|
||
* Save where we were...
|
||
*/
|
||
|
||
oldPosHigh = 0;
|
||
oldPos = SetFilePointer(infoPtr->handle, 0, &oldPosHigh, FILE_CURRENT);
|
||
if (oldPos == (LONG)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 == (LONG)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 = instanceData;
|
||
DWORD bytesRead;
|
||
|
||
*errorCode = 0;
|
||
|
||
/*
|
||
* TODO: This comment appears to be out of date. We *do* have a
|
||
* console driver, over in tclWinConsole.c. After some Windows
|
||
* developer confirms, this comment should be revised.
|
||
*
|
||
* 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 = 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 = 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 = 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;
|
||
const WCHAR *nativeName;
|
||
HANDLE handle;
|
||
char channelName[16 + TCL_INTEGER_SPACE];
|
||
TclFile readFile = NULL, writeFile = NULL;
|
||
|
||
nativeName = Tcl_FSGetNativePath(pathPtr);
|
||
if (nativeName == NULL) {
|
||
if (interp != (Tcl_Interp *) NULL) {
|
||
Tcl_AppendResult(interp, "couldn't open \"",
|
||
TclGetString(pathPtr), "\": filename is invalid on this platform",
|
||
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;
|
||
}
|
||
|
||
/*
|
||
* [2413550] Avoid double-open of serial ports on Windows
|
||
* Special handling for Windows serial ports by a "name-hint"
|
||
* to directly open it with the OVERLAPPED flag set.
|
||
*/
|
||
|
||
if( NativeIsComPort(nativeName) ) {
|
||
|
||
handle = TclWinSerialOpen(INVALID_HANDLE_VALUE, nativeName, accessMode);
|
||
if (handle == INVALID_HANDLE_VALUE) {
|
||
TclWinConvertError(GetLastError());
|
||
if (interp != (Tcl_Interp *) NULL) {
|
||
Tcl_AppendResult(interp, "couldn't open serial \"",
|
||
TclGetString(pathPtr), "\": ",
|
||
Tcl_PosixError(interp), NULL);
|
||
}
|
||
return NULL;
|
||
}
|
||
|
||
/*
|
||
* For natively named Windows serial ports we are done.
|
||
*/
|
||
channel = TclWinOpenSerialChannel(handle, channelName,
|
||
channelPermissions);
|
||
|
||
return channel;
|
||
}
|
||
/*
|
||
* 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 = GetFileAttributesW(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.
|
||
*/
|
||
|
||
handle = CreateFileW(nativeName, accessMode, shareMode,
|
||
NULL, createMode, flags, (HANDLE) NULL);
|
||
|
||
if (handle == INVALID_HANDLE_VALUE) {
|
||
DWORD err = GetLastError();
|
||
|
||
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_SetObjResult(interp, Tcl_ObjPrintf(
|
||
"couldn't open \"%s\": %s",
|
||
TclGetString(pathPtr), Tcl_PosixError(interp)));
|
||
}
|
||
return NULL;
|
||
}
|
||
|
||
channel = NULL;
|
||
|
||
switch (FileGetType(handle)) {
|
||
case FILE_TYPE_SERIAL:
|
||
/*
|
||
* Natively named serial ports "com1-9", "\\\\.\\comXX" are
|
||
* already done with the code above.
|
||
* Here we handle all other serial port names.
|
||
*
|
||
* Reopen channel for OVERLAPPED operation. Normally this shouldn't
|
||
* fail, because the channel exists.
|
||
*/
|
||
|
||
handle = TclWinSerialOpen(handle, nativeName, accessMode);
|
||
if (handle == INVALID_HANDLE_VALUE) {
|
||
TclWinConvertError(GetLastError());
|
||
if (interp != (Tcl_Interp *) NULL) {
|
||
Tcl_SetObjResult(interp, Tcl_ObjPrintf(
|
||
"couldn't reopen serial \"%s\": %s",
|
||
TclGetString(pathPtr), Tcl_PosixError(interp)));
|
||
}
|
||
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_SetObjResult(interp, Tcl_ObjPrintf(
|
||
"couldn't open \"%s\": bad file type",
|
||
TclGetString(pathPtr)));
|
||
Tcl_SetErrorCode(interp, "TCL", "VALUE", "CHANNEL", "BAD_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. */
|
||
{
|
||
#if defined(HAVE_NO_SEH) && !defined(_WIN64) && !defined(__clang__)
|
||
TCLEXCEPTION_REGISTRATION registration;
|
||
#endif
|
||
char channelName[16 + TCL_INTEGER_SPACE];
|
||
Tcl_Channel channel = NULL;
|
||
HANDLE handle = (HANDLE) rawHandle;
|
||
HANDLE dupedHandle;
|
||
TclFile readFile = NULL, writeFile = NULL;
|
||
BOOL result;
|
||
|
||
if (mode == 0) {
|
||
return NULL;
|
||
}
|
||
|
||
switch (FileGetType(handle)) {
|
||
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 definitely 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;
|
||
#if defined(HAVE_NO_SEH) && !defined(_WIN64) && !defined(__clang__)
|
||
/*
|
||
* 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 TCLEXCEPTION_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 TCLEXCEPTION_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 TCLEXCEPTION_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 TCLEXCEPTION_REGISTRATION
|
||
*/
|
||
|
||
"1:" "\t"
|
||
"movl %%fs:0, %%edx" "\n\t"
|
||
"movl 0x8(%%edx), %%edx" "\n\t"
|
||
|
||
/*
|
||
* Come here however we exited. Restore context from the
|
||
* TCLEXCEPTION_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;
|
||
#else
|
||
#ifndef HAVE_NO_SEH
|
||
__try {
|
||
#endif
|
||
CloseHandle(dupedHandle);
|
||
result = 1;
|
||
#ifndef HAVE_NO_SEH
|
||
} __except (EXCEPTION_EXECUTE_HANDLER) {}
|
||
#endif
|
||
#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;
|
||
const char *bufMode = NULL;
|
||
DWORD handleId = (DWORD) -1;
|
||
/* 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 = ckalloc(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;
|
||
sprintf(channelName, "file%" TCL_Z_MODIFIER "x", (size_t) infoPtr);
|
||
|
||
infoPtr->channel = Tcl_CreateChannel(&fileChannelType, channelName,
|
||
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 = 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");
|
||
}
|
||
}
|
||
}
|
||
|
||
/*
|
||
*----------------------------------------------------------------------
|
||
*
|
||
* FileGetType --
|
||
*
|
||
* Given a file handle, return its type
|
||
*
|
||
* Results:
|
||
* None.
|
||
*
|
||
* Side effects:
|
||
* None.
|
||
*
|
||
*----------------------------------------------------------------------
|
||
*/
|
||
|
||
DWORD
|
||
FileGetType(
|
||
HANDLE handle) /* Opened file handle */
|
||
{
|
||
DWORD type;
|
||
|
||
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)
|
||
|| ((type == FILE_TYPE_UNKNOWN) && !GetLastError())) {
|
||
DWORD consoleParams;
|
||
|
||
if (GetConsoleMode(handle, &consoleParams)) {
|
||
type = FILE_TYPE_CONSOLE;
|
||
} else {
|
||
DCB dcb;
|
||
|
||
dcb.DCBlength = sizeof(DCB);
|
||
if (GetCommState(handle, &dcb)) {
|
||
type = FILE_TYPE_SERIAL;
|
||
}
|
||
}
|
||
}
|
||
|
||
return type;
|
||
}
|
||
|
||
/*
|
||
*----------------------------------------------------------------------
|
||
*
|
||
* NativeIsComPort --
|
||
*
|
||
* Determines if a path refers to a Windows serial port.
|
||
* A simple and efficient solution is to use a "name hint" to detect
|
||
* COM ports by their filename instead of resorting to a syscall
|
||
* to detect serialness after the fact.
|
||
* The following patterns cover common serial port names:
|
||
* COM[1-9]
|
||
* \\.\COM[0-9]+
|
||
*
|
||
* Results:
|
||
* 1 = serial port, 0 = not.
|
||
*
|
||
*----------------------------------------------------------------------
|
||
*/
|
||
|
||
static int
|
||
NativeIsComPort(
|
||
const WCHAR *nativePath) /* Path of file to access, native encoding. */
|
||
{
|
||
const WCHAR *p = (const WCHAR *) nativePath;
|
||
int i, len = wcslen(p);
|
||
|
||
/*
|
||
* 1. Look for com[1-9]:?
|
||
*/
|
||
|
||
if ( (len == 4) && (_wcsnicmp(p, L"com", 3) == 0) ) {
|
||
/*
|
||
* The 4th character must be a digit 1..9
|
||
*/
|
||
|
||
if ( (p[3] < L'1') || (p[3] > L'9') ) {
|
||
return 0;
|
||
}
|
||
return 1;
|
||
}
|
||
|
||
/*
|
||
* 2. Look for \\.\com[0-9]+
|
||
*/
|
||
|
||
if ((len >= 8) && (_wcsnicmp(p, L"\\\\.\\com", 7) == 0)) {
|
||
/*
|
||
* Charaters 8..end must be a digits 0..9
|
||
*/
|
||
|
||
for ( i=7; i<len; i++ ) {
|
||
if ( (p[i] < '0') || (p[i] > '9') ) {
|
||
return 0;
|
||
}
|
||
}
|
||
return 1;
|
||
}
|
||
return 0;
|
||
}
|
||
|
||
/*
|
||
* Local Variables:
|
||
* mode: c
|
||
* c-basic-offset: 4
|
||
* fill-column: 78
|
||
* End:
|
||
*/
|