| 1 |
578 |
markom |
/*
|
| 2 |
|
|
* tclXtNotify.c --
|
| 3 |
|
|
*
|
| 4 |
|
|
* This file contains the notifier driver implementation for the
|
| 5 |
|
|
* Xt intrinsics.
|
| 6 |
|
|
*
|
| 7 |
|
|
* Copyright (c) 1997 by Sun Microsystems, Inc.
|
| 8 |
|
|
*
|
| 9 |
|
|
* See the file "license.terms" for information on usage and redistribution
|
| 10 |
|
|
* of this file, and for a DISCLAIMER OF ALL WARRANTIES.
|
| 11 |
|
|
*
|
| 12 |
|
|
* RCS: @(#) $Id: tclXtNotify.c,v 1.1.1.1 2002-01-16 10:25:37 markom Exp $
|
| 13 |
|
|
*/
|
| 14 |
|
|
|
| 15 |
|
|
#include <X11/Intrinsic.h>
|
| 16 |
|
|
#include <tclInt.h>
|
| 17 |
|
|
|
| 18 |
|
|
/*
|
| 19 |
|
|
* This structure is used to keep track of the notifier info for a
|
| 20 |
|
|
* a registered file.
|
| 21 |
|
|
*/
|
| 22 |
|
|
|
| 23 |
|
|
typedef struct FileHandler {
|
| 24 |
|
|
int fd;
|
| 25 |
|
|
int mask; /* Mask of desired events: TCL_READABLE, etc. */
|
| 26 |
|
|
int readyMask; /* Events that have been seen since the
|
| 27 |
|
|
last time FileHandlerEventProc was called
|
| 28 |
|
|
for this file. */
|
| 29 |
|
|
XtInputId read; /* Xt read callback handle. */
|
| 30 |
|
|
XtInputId write; /* Xt write callback handle. */
|
| 31 |
|
|
XtInputId except; /* Xt exception callback handle. */
|
| 32 |
|
|
Tcl_FileProc *proc; /* Procedure to call, in the style of
|
| 33 |
|
|
* Tcl_CreateFileHandler. */
|
| 34 |
|
|
ClientData clientData; /* Argument to pass to proc. */
|
| 35 |
|
|
struct FileHandler *nextPtr;/* Next in list of all files we care about. */
|
| 36 |
|
|
} FileHandler;
|
| 37 |
|
|
|
| 38 |
|
|
/*
|
| 39 |
|
|
* The following structure is what is added to the Tcl event queue when
|
| 40 |
|
|
* file handlers are ready to fire.
|
| 41 |
|
|
*/
|
| 42 |
|
|
|
| 43 |
|
|
typedef struct FileHandlerEvent {
|
| 44 |
|
|
Tcl_Event header; /* Information that is standard for
|
| 45 |
|
|
* all events. */
|
| 46 |
|
|
int fd; /* File descriptor that is ready. Used
|
| 47 |
|
|
* to find the FileHandler structure for
|
| 48 |
|
|
* the file (can't point directly to the
|
| 49 |
|
|
* FileHandler structure because it could
|
| 50 |
|
|
* go away while the event is queued). */
|
| 51 |
|
|
} FileHandlerEvent;
|
| 52 |
|
|
|
| 53 |
|
|
/*
|
| 54 |
|
|
* The following static structure contains the state information for the
|
| 55 |
|
|
* Xt based implementation of the Tcl notifier.
|
| 56 |
|
|
*/
|
| 57 |
|
|
|
| 58 |
|
|
static struct NotifierState {
|
| 59 |
|
|
XtAppContext appContext; /* The context used by the Xt
|
| 60 |
|
|
* notifier. Can be set with
|
| 61 |
|
|
* TclSetAppContext. */
|
| 62 |
|
|
int appContextCreated; /* Was it created by us? */
|
| 63 |
|
|
XtIntervalId currentTimeout; /* Handle of current timer. */
|
| 64 |
|
|
FileHandler *firstFileHandlerPtr; /* Pointer to head of file handler
|
| 65 |
|
|
* list. */
|
| 66 |
|
|
} notifier;
|
| 67 |
|
|
|
| 68 |
|
|
/*
|
| 69 |
|
|
* The following static indicates whether this module has been initialized.
|
| 70 |
|
|
*/
|
| 71 |
|
|
|
| 72 |
|
|
static int initialized = 0;
|
| 73 |
|
|
|
| 74 |
|
|
/*
|
| 75 |
|
|
* Static routines defined in this file.
|
| 76 |
|
|
*/
|
| 77 |
|
|
|
| 78 |
|
|
static int FileHandlerEventProc _ANSI_ARGS_((Tcl_Event *evPtr,
|
| 79 |
|
|
int flags));
|
| 80 |
|
|
static void FileProc _ANSI_ARGS_((caddr_t clientData,
|
| 81 |
|
|
int *source, XtInputId *id));
|
| 82 |
|
|
static void InitNotifier _ANSI_ARGS_((void));
|
| 83 |
|
|
static void NotifierExitHandler _ANSI_ARGS_((
|
| 84 |
|
|
ClientData clientData));
|
| 85 |
|
|
static void TimerProc _ANSI_ARGS_((caddr_t clientData,
|
| 86 |
|
|
XtIntervalId *id));
|
| 87 |
|
|
|
| 88 |
|
|
/*
|
| 89 |
|
|
* Functions defined in this file for use by users of the Xt Notifier:
|
| 90 |
|
|
*/
|
| 91 |
|
|
|
| 92 |
|
|
EXTERN XtAppContext TclSetAppContext _ANSI_ARGS_((XtAppContext ctx));
|
| 93 |
|
|
|
| 94 |
|
|
/*
|
| 95 |
|
|
*----------------------------------------------------------------------
|
| 96 |
|
|
*
|
| 97 |
|
|
* TclSetAppContext --
|
| 98 |
|
|
*
|
| 99 |
|
|
* Set the notifier application context.
|
| 100 |
|
|
*
|
| 101 |
|
|
* Results:
|
| 102 |
|
|
* None.
|
| 103 |
|
|
*
|
| 104 |
|
|
* Side effects:
|
| 105 |
|
|
* Sets the application context used by the notifier. Panics if
|
| 106 |
|
|
* the context is already set when called.
|
| 107 |
|
|
*
|
| 108 |
|
|
*----------------------------------------------------------------------
|
| 109 |
|
|
*/
|
| 110 |
|
|
|
| 111 |
|
|
XtAppContext
|
| 112 |
|
|
TclSetAppContext(appContext)
|
| 113 |
|
|
XtAppContext appContext;
|
| 114 |
|
|
{
|
| 115 |
|
|
if (!initialized) {
|
| 116 |
|
|
InitNotifier();
|
| 117 |
|
|
}
|
| 118 |
|
|
|
| 119 |
|
|
/*
|
| 120 |
|
|
* If we already have a context we check whether we were asked to set a
|
| 121 |
|
|
* new context. If so, we panic because we try to prevent switching
|
| 122 |
|
|
* contexts by mistake. Otherwise, we return the one we have.
|
| 123 |
|
|
*/
|
| 124 |
|
|
|
| 125 |
|
|
if (notifier.appContext != NULL) {
|
| 126 |
|
|
if (appContext != NULL) {
|
| 127 |
|
|
|
| 128 |
|
|
/*
|
| 129 |
|
|
* We already have a context. We do not allow switching contexts
|
| 130 |
|
|
* after initialization, so we panic.
|
| 131 |
|
|
*/
|
| 132 |
|
|
|
| 133 |
|
|
panic("TclSetAppContext: multiple application contexts");
|
| 134 |
|
|
|
| 135 |
|
|
}
|
| 136 |
|
|
} else {
|
| 137 |
|
|
|
| 138 |
|
|
/*
|
| 139 |
|
|
* If we get here we have not yet gotten a context, so either create
|
| 140 |
|
|
* one or use the one supplied by our caller.
|
| 141 |
|
|
*/
|
| 142 |
|
|
|
| 143 |
|
|
if (appContext == NULL) {
|
| 144 |
|
|
|
| 145 |
|
|
/*
|
| 146 |
|
|
* We must create a new context and tell our caller what it is, so
|
| 147 |
|
|
* she can use it too.
|
| 148 |
|
|
*/
|
| 149 |
|
|
|
| 150 |
|
|
notifier.appContext = XtCreateApplicationContext();
|
| 151 |
|
|
notifier.appContextCreated = 1;
|
| 152 |
|
|
} else {
|
| 153 |
|
|
|
| 154 |
|
|
/*
|
| 155 |
|
|
* Otherwise we remember the context that our caller gave us
|
| 156 |
|
|
* and use it.
|
| 157 |
|
|
*/
|
| 158 |
|
|
|
| 159 |
|
|
notifier.appContextCreated = 0;
|
| 160 |
|
|
notifier.appContext = appContext;
|
| 161 |
|
|
}
|
| 162 |
|
|
}
|
| 163 |
|
|
|
| 164 |
|
|
return notifier.appContext;
|
| 165 |
|
|
}
|
| 166 |
|
|
|
| 167 |
|
|
/*
|
| 168 |
|
|
*----------------------------------------------------------------------
|
| 169 |
|
|
*
|
| 170 |
|
|
* InitNotifier --
|
| 171 |
|
|
*
|
| 172 |
|
|
* Initializes the notifier state.
|
| 173 |
|
|
*
|
| 174 |
|
|
* Results:
|
| 175 |
|
|
* None.
|
| 176 |
|
|
*
|
| 177 |
|
|
* Side effects:
|
| 178 |
|
|
* Creates a new exit handler.
|
| 179 |
|
|
*
|
| 180 |
|
|
*----------------------------------------------------------------------
|
| 181 |
|
|
*/
|
| 182 |
|
|
|
| 183 |
|
|
static void
|
| 184 |
|
|
InitNotifier(void)
|
| 185 |
|
|
{
|
| 186 |
|
|
/*
|
| 187 |
|
|
* Only reinitialize if we are not in exit handling. The notifier
|
| 188 |
|
|
* can get reinitialized after its own exit handler has run, because
|
| 189 |
|
|
* of exit handlers for the I/O and timer sub-systems (order dependency).
|
| 190 |
|
|
*/
|
| 191 |
|
|
|
| 192 |
|
|
if (TclInExit()) {
|
| 193 |
|
|
return;
|
| 194 |
|
|
}
|
| 195 |
|
|
|
| 196 |
|
|
/*
|
| 197 |
|
|
* DO NOT create the application context yet; doing so would prevent
|
| 198 |
|
|
* external applications from setting it for us to their own ones.
|
| 199 |
|
|
*/
|
| 200 |
|
|
|
| 201 |
|
|
initialized = 1;
|
| 202 |
|
|
memset(¬ifier, 0, sizeof(notifier));
|
| 203 |
|
|
Tcl_CreateExitHandler(NotifierExitHandler, NULL);
|
| 204 |
|
|
}
|
| 205 |
|
|
|
| 206 |
|
|
/*
|
| 207 |
|
|
*----------------------------------------------------------------------
|
| 208 |
|
|
*
|
| 209 |
|
|
* NotifierExitHandler --
|
| 210 |
|
|
*
|
| 211 |
|
|
* This function is called to cleanup the notifier state before
|
| 212 |
|
|
* Tcl is unloaded.
|
| 213 |
|
|
*
|
| 214 |
|
|
* Results:
|
| 215 |
|
|
* None.
|
| 216 |
|
|
*
|
| 217 |
|
|
* Side effects:
|
| 218 |
|
|
* Destroys the notifier window.
|
| 219 |
|
|
*
|
| 220 |
|
|
*----------------------------------------------------------------------
|
| 221 |
|
|
*/
|
| 222 |
|
|
|
| 223 |
|
|
static void
|
| 224 |
|
|
NotifierExitHandler(
|
| 225 |
|
|
ClientData clientData) /* Not used. */
|
| 226 |
|
|
{
|
| 227 |
|
|
if (notifier.currentTimeout != 0) {
|
| 228 |
|
|
XtRemoveTimeOut(notifier.currentTimeout);
|
| 229 |
|
|
}
|
| 230 |
|
|
for (; notifier.firstFileHandlerPtr != NULL; ) {
|
| 231 |
|
|
Tcl_DeleteFileHandler(notifier.firstFileHandlerPtr->fd);
|
| 232 |
|
|
}
|
| 233 |
|
|
if (notifier.appContextCreated) {
|
| 234 |
|
|
XtDestroyApplicationContext(notifier.appContext);
|
| 235 |
|
|
notifier.appContextCreated = 0;
|
| 236 |
|
|
notifier.appContext = NULL;
|
| 237 |
|
|
}
|
| 238 |
|
|
initialized = 0;
|
| 239 |
|
|
}
|
| 240 |
|
|
|
| 241 |
|
|
/*
|
| 242 |
|
|
*----------------------------------------------------------------------
|
| 243 |
|
|
*
|
| 244 |
|
|
* Tcl_SetTimer --
|
| 245 |
|
|
*
|
| 246 |
|
|
* This procedure sets the current notifier timeout value.
|
| 247 |
|
|
*
|
| 248 |
|
|
* Results:
|
| 249 |
|
|
* None.
|
| 250 |
|
|
*
|
| 251 |
|
|
* Side effects:
|
| 252 |
|
|
* Replaces any previous timer.
|
| 253 |
|
|
*
|
| 254 |
|
|
*----------------------------------------------------------------------
|
| 255 |
|
|
*/
|
| 256 |
|
|
|
| 257 |
|
|
void
|
| 258 |
|
|
Tcl_SetTimer(timePtr)
|
| 259 |
|
|
Tcl_Time *timePtr; /* Timeout value, may be NULL. */
|
| 260 |
|
|
{
|
| 261 |
|
|
long timeout;
|
| 262 |
|
|
|
| 263 |
|
|
if (!initialized) {
|
| 264 |
|
|
InitNotifier();
|
| 265 |
|
|
}
|
| 266 |
|
|
|
| 267 |
|
|
TclSetAppContext(NULL);
|
| 268 |
|
|
if (notifier.currentTimeout != 0) {
|
| 269 |
|
|
XtRemoveTimeOut(notifier.currentTimeout);
|
| 270 |
|
|
}
|
| 271 |
|
|
if (timePtr) {
|
| 272 |
|
|
timeout = timePtr->sec * 1000 + timePtr->usec / 1000;
|
| 273 |
|
|
notifier.currentTimeout =
|
| 274 |
|
|
XtAppAddTimeOut(notifier.appContext, (unsigned long) timeout,
|
| 275 |
|
|
TimerProc, NULL);
|
| 276 |
|
|
} else {
|
| 277 |
|
|
notifier.currentTimeout = 0;
|
| 278 |
|
|
}
|
| 279 |
|
|
}
|
| 280 |
|
|
|
| 281 |
|
|
/*
|
| 282 |
|
|
*----------------------------------------------------------------------
|
| 283 |
|
|
*
|
| 284 |
|
|
* TimerProc --
|
| 285 |
|
|
*
|
| 286 |
|
|
* This procedure is the XtTimerCallbackProc used to handle
|
| 287 |
|
|
* timeouts.
|
| 288 |
|
|
*
|
| 289 |
|
|
* Results:
|
| 290 |
|
|
* None.
|
| 291 |
|
|
*
|
| 292 |
|
|
* Side effects:
|
| 293 |
|
|
* Processes all queued events.
|
| 294 |
|
|
*
|
| 295 |
|
|
*----------------------------------------------------------------------
|
| 296 |
|
|
*/
|
| 297 |
|
|
|
| 298 |
|
|
static void
|
| 299 |
|
|
TimerProc(data, id)
|
| 300 |
|
|
caddr_t data; /* Not used. */
|
| 301 |
|
|
XtIntervalId *id;
|
| 302 |
|
|
{
|
| 303 |
|
|
if (*id != notifier.currentTimeout) {
|
| 304 |
|
|
return;
|
| 305 |
|
|
}
|
| 306 |
|
|
notifier.currentTimeout = 0;
|
| 307 |
|
|
|
| 308 |
|
|
Tcl_ServiceAll();
|
| 309 |
|
|
}
|
| 310 |
|
|
|
| 311 |
|
|
/*
|
| 312 |
|
|
*----------------------------------------------------------------------
|
| 313 |
|
|
*
|
| 314 |
|
|
* Tcl_CreateFileHandler --
|
| 315 |
|
|
*
|
| 316 |
|
|
* This procedure registers a file handler with the Xt notifier.
|
| 317 |
|
|
*
|
| 318 |
|
|
* Results:
|
| 319 |
|
|
* None.
|
| 320 |
|
|
*
|
| 321 |
|
|
* Side effects:
|
| 322 |
|
|
* Creates a new file handler structure and registers one or more
|
| 323 |
|
|
* input procedures with Xt.
|
| 324 |
|
|
*
|
| 325 |
|
|
*----------------------------------------------------------------------
|
| 326 |
|
|
*/
|
| 327 |
|
|
|
| 328 |
|
|
void
|
| 329 |
|
|
Tcl_CreateFileHandler(fd, mask, proc, clientData)
|
| 330 |
|
|
int fd; /* Handle of stream to watch. */
|
| 331 |
|
|
int mask; /* OR'ed combination of TCL_READABLE,
|
| 332 |
|
|
* TCL_WRITABLE, and TCL_EXCEPTION:
|
| 333 |
|
|
* indicates conditions under which
|
| 334 |
|
|
* proc should be called. */
|
| 335 |
|
|
Tcl_FileProc *proc; /* Procedure to call for each
|
| 336 |
|
|
* selected event. */
|
| 337 |
|
|
ClientData clientData; /* Arbitrary data to pass to proc. */
|
| 338 |
|
|
{
|
| 339 |
|
|
FileHandler *filePtr;
|
| 340 |
|
|
|
| 341 |
|
|
if (!initialized) {
|
| 342 |
|
|
InitNotifier();
|
| 343 |
|
|
}
|
| 344 |
|
|
|
| 345 |
|
|
TclSetAppContext(NULL);
|
| 346 |
|
|
|
| 347 |
|
|
for (filePtr = notifier.firstFileHandlerPtr; filePtr != NULL;
|
| 348 |
|
|
filePtr = filePtr->nextPtr) {
|
| 349 |
|
|
if (filePtr->fd == fd) {
|
| 350 |
|
|
break;
|
| 351 |
|
|
}
|
| 352 |
|
|
}
|
| 353 |
|
|
if (filePtr == NULL) {
|
| 354 |
|
|
filePtr = (FileHandler*) ckalloc(sizeof(FileHandler));
|
| 355 |
|
|
filePtr->fd = fd;
|
| 356 |
|
|
filePtr->read = 0;
|
| 357 |
|
|
filePtr->write = 0;
|
| 358 |
|
|
filePtr->except = 0;
|
| 359 |
|
|
filePtr->readyMask = 0;
|
| 360 |
|
|
filePtr->mask = 0;
|
| 361 |
|
|
filePtr->nextPtr = notifier.firstFileHandlerPtr;
|
| 362 |
|
|
notifier.firstFileHandlerPtr = filePtr;
|
| 363 |
|
|
}
|
| 364 |
|
|
filePtr->proc = proc;
|
| 365 |
|
|
filePtr->clientData = clientData;
|
| 366 |
|
|
|
| 367 |
|
|
/*
|
| 368 |
|
|
* Register the file with the Xt notifier, if it hasn't been done yet.
|
| 369 |
|
|
*/
|
| 370 |
|
|
|
| 371 |
|
|
if (mask & TCL_READABLE) {
|
| 372 |
|
|
if (!(filePtr->mask & TCL_READABLE)) {
|
| 373 |
|
|
filePtr->read =
|
| 374 |
|
|
XtAppAddInput(notifier.appContext, fd, XtInputReadMask,
|
| 375 |
|
|
FileProc, filePtr);
|
| 376 |
|
|
}
|
| 377 |
|
|
} else {
|
| 378 |
|
|
if (filePtr->mask & TCL_READABLE) {
|
| 379 |
|
|
XtRemoveInput(filePtr->read);
|
| 380 |
|
|
}
|
| 381 |
|
|
}
|
| 382 |
|
|
if (mask & TCL_WRITABLE) {
|
| 383 |
|
|
if (!(filePtr->mask & TCL_WRITABLE)) {
|
| 384 |
|
|
filePtr->write =
|
| 385 |
|
|
XtAppAddInput(notifier.appContext, fd, XtInputWriteMask,
|
| 386 |
|
|
FileProc, filePtr);
|
| 387 |
|
|
}
|
| 388 |
|
|
} else {
|
| 389 |
|
|
if (filePtr->mask & TCL_WRITABLE) {
|
| 390 |
|
|
XtRemoveInput(filePtr->write);
|
| 391 |
|
|
}
|
| 392 |
|
|
}
|
| 393 |
|
|
if (mask & TCL_EXCEPTION) {
|
| 394 |
|
|
if (!(filePtr->mask & TCL_EXCEPTION)) {
|
| 395 |
|
|
filePtr->except =
|
| 396 |
|
|
XtAppAddInput(notifier.appContext, fd, XtInputExceptMask,
|
| 397 |
|
|
FileProc, filePtr);
|
| 398 |
|
|
}
|
| 399 |
|
|
} else {
|
| 400 |
|
|
if (filePtr->mask & TCL_EXCEPTION) {
|
| 401 |
|
|
XtRemoveInput(filePtr->except);
|
| 402 |
|
|
}
|
| 403 |
|
|
}
|
| 404 |
|
|
filePtr->mask = mask;
|
| 405 |
|
|
}
|
| 406 |
|
|
|
| 407 |
|
|
/*
|
| 408 |
|
|
*----------------------------------------------------------------------
|
| 409 |
|
|
*
|
| 410 |
|
|
* Tcl_DeleteFileHandler --
|
| 411 |
|
|
*
|
| 412 |
|
|
* Cancel a previously-arranged callback arrangement for
|
| 413 |
|
|
* a file.
|
| 414 |
|
|
*
|
| 415 |
|
|
* Results:
|
| 416 |
|
|
* None.
|
| 417 |
|
|
*
|
| 418 |
|
|
* Side effects:
|
| 419 |
|
|
* If a callback was previously registered on file, remove it.
|
| 420 |
|
|
*
|
| 421 |
|
|
*----------------------------------------------------------------------
|
| 422 |
|
|
*/
|
| 423 |
|
|
|
| 424 |
|
|
void
|
| 425 |
|
|
Tcl_DeleteFileHandler(fd)
|
| 426 |
|
|
int fd; /* Stream id for which to remove
|
| 427 |
|
|
* callback procedure. */
|
| 428 |
|
|
{
|
| 429 |
|
|
FileHandler *filePtr, *prevPtr;
|
| 430 |
|
|
|
| 431 |
|
|
if (!initialized) {
|
| 432 |
|
|
InitNotifier();
|
| 433 |
|
|
}
|
| 434 |
|
|
|
| 435 |
|
|
TclSetAppContext(NULL);
|
| 436 |
|
|
|
| 437 |
|
|
/*
|
| 438 |
|
|
* Find the entry for the given file (and return if there
|
| 439 |
|
|
* isn't one).
|
| 440 |
|
|
*/
|
| 441 |
|
|
|
| 442 |
|
|
for (prevPtr = NULL, filePtr = notifier.firstFileHandlerPtr; ;
|
| 443 |
|
|
prevPtr = filePtr, filePtr = filePtr->nextPtr) {
|
| 444 |
|
|
if (filePtr == NULL) {
|
| 445 |
|
|
return;
|
| 446 |
|
|
}
|
| 447 |
|
|
if (filePtr->fd == fd) {
|
| 448 |
|
|
break;
|
| 449 |
|
|
}
|
| 450 |
|
|
}
|
| 451 |
|
|
|
| 452 |
|
|
/*
|
| 453 |
|
|
* Clean up information in the callback record.
|
| 454 |
|
|
*/
|
| 455 |
|
|
|
| 456 |
|
|
if (prevPtr == NULL) {
|
| 457 |
|
|
notifier.firstFileHandlerPtr = filePtr->nextPtr;
|
| 458 |
|
|
} else {
|
| 459 |
|
|
prevPtr->nextPtr = filePtr->nextPtr;
|
| 460 |
|
|
}
|
| 461 |
|
|
if (filePtr->mask & TCL_READABLE) {
|
| 462 |
|
|
XtRemoveInput(filePtr->read);
|
| 463 |
|
|
}
|
| 464 |
|
|
if (filePtr->mask & TCL_WRITABLE) {
|
| 465 |
|
|
XtRemoveInput(filePtr->write);
|
| 466 |
|
|
}
|
| 467 |
|
|
if (filePtr->mask & TCL_EXCEPTION) {
|
| 468 |
|
|
XtRemoveInput(filePtr->except);
|
| 469 |
|
|
}
|
| 470 |
|
|
ckfree((char *) filePtr);
|
| 471 |
|
|
}
|
| 472 |
|
|
|
| 473 |
|
|
/*
|
| 474 |
|
|
*----------------------------------------------------------------------
|
| 475 |
|
|
*
|
| 476 |
|
|
* FileProc --
|
| 477 |
|
|
*
|
| 478 |
|
|
* These procedures are called by Xt when a file becomes readable,
|
| 479 |
|
|
* writable, or has an exception.
|
| 480 |
|
|
*
|
| 481 |
|
|
* Results:
|
| 482 |
|
|
* None.
|
| 483 |
|
|
*
|
| 484 |
|
|
* Side effects:
|
| 485 |
|
|
* Makes an entry on the Tcl event queue if the event is
|
| 486 |
|
|
* interesting.
|
| 487 |
|
|
*
|
| 488 |
|
|
*----------------------------------------------------------------------
|
| 489 |
|
|
*/
|
| 490 |
|
|
|
| 491 |
|
|
static void
|
| 492 |
|
|
FileProc(clientData, fd, id)
|
| 493 |
|
|
caddr_t clientData;
|
| 494 |
|
|
int *fd;
|
| 495 |
|
|
XtInputId *id;
|
| 496 |
|
|
{
|
| 497 |
|
|
FileHandler *filePtr = (FileHandler *)clientData;
|
| 498 |
|
|
FileHandlerEvent *fileEvPtr;
|
| 499 |
|
|
int mask = 0;
|
| 500 |
|
|
|
| 501 |
|
|
/*
|
| 502 |
|
|
* Determine which event happened.
|
| 503 |
|
|
*/
|
| 504 |
|
|
|
| 505 |
|
|
if (*id == filePtr->read) {
|
| 506 |
|
|
mask = TCL_READABLE;
|
| 507 |
|
|
} else if (*id == filePtr->write) {
|
| 508 |
|
|
mask = TCL_WRITABLE;
|
| 509 |
|
|
} else if (*id == filePtr->except) {
|
| 510 |
|
|
mask = TCL_EXCEPTION;
|
| 511 |
|
|
}
|
| 512 |
|
|
|
| 513 |
|
|
/*
|
| 514 |
|
|
* Ignore unwanted or duplicate events.
|
| 515 |
|
|
*/
|
| 516 |
|
|
|
| 517 |
|
|
if (!(filePtr->mask & mask) || (filePtr->readyMask & mask)) {
|
| 518 |
|
|
return;
|
| 519 |
|
|
}
|
| 520 |
|
|
|
| 521 |
|
|
/*
|
| 522 |
|
|
* This is an interesting event, so put it onto the event queue.
|
| 523 |
|
|
*/
|
| 524 |
|
|
|
| 525 |
|
|
filePtr->readyMask |= mask;
|
| 526 |
|
|
fileEvPtr = (FileHandlerEvent *) ckalloc(sizeof(FileHandlerEvent));
|
| 527 |
|
|
fileEvPtr->header.proc = FileHandlerEventProc;
|
| 528 |
|
|
fileEvPtr->fd = filePtr->fd;
|
| 529 |
|
|
Tcl_QueueEvent((Tcl_Event *) fileEvPtr, TCL_QUEUE_TAIL);
|
| 530 |
|
|
|
| 531 |
|
|
/*
|
| 532 |
|
|
* Process events on the Tcl event queue before returning to Xt.
|
| 533 |
|
|
*/
|
| 534 |
|
|
|
| 535 |
|
|
Tcl_ServiceAll();
|
| 536 |
|
|
}
|
| 537 |
|
|
|
| 538 |
|
|
/*
|
| 539 |
|
|
*----------------------------------------------------------------------
|
| 540 |
|
|
*
|
| 541 |
|
|
* FileHandlerEventProc --
|
| 542 |
|
|
*
|
| 543 |
|
|
* This procedure is called by Tcl_ServiceEvent when a file event
|
| 544 |
|
|
* reaches the front of the event queue. This procedure is
|
| 545 |
|
|
* responsible for actually handling the event by invoking the
|
| 546 |
|
|
* callback for the file handler.
|
| 547 |
|
|
*
|
| 548 |
|
|
* Results:
|
| 549 |
|
|
* Returns 1 if the event was handled, meaning it should be removed
|
| 550 |
|
|
* from the queue. Returns 0 if the event was not handled, meaning
|
| 551 |
|
|
* it should stay on the queue. The only time the event isn't
|
| 552 |
|
|
* handled is if the TCL_FILE_EVENTS flag bit isn't set.
|
| 553 |
|
|
*
|
| 554 |
|
|
* Side effects:
|
| 555 |
|
|
* Whatever the file handler's callback procedure does.
|
| 556 |
|
|
*
|
| 557 |
|
|
*----------------------------------------------------------------------
|
| 558 |
|
|
*/
|
| 559 |
|
|
|
| 560 |
|
|
static int
|
| 561 |
|
|
FileHandlerEventProc(evPtr, flags)
|
| 562 |
|
|
Tcl_Event *evPtr; /* Event to service. */
|
| 563 |
|
|
int flags; /* Flags that indicate what events to
|
| 564 |
|
|
* handle, such as TCL_FILE_EVENTS. */
|
| 565 |
|
|
{
|
| 566 |
|
|
FileHandler *filePtr;
|
| 567 |
|
|
FileHandlerEvent *fileEvPtr = (FileHandlerEvent *) evPtr;
|
| 568 |
|
|
int mask;
|
| 569 |
|
|
|
| 570 |
|
|
if (!(flags & TCL_FILE_EVENTS)) {
|
| 571 |
|
|
return 0;
|
| 572 |
|
|
}
|
| 573 |
|
|
|
| 574 |
|
|
/*
|
| 575 |
|
|
* Search through the file handlers to find the one whose handle matches
|
| 576 |
|
|
* the event. We do this rather than keeping a pointer to the file
|
| 577 |
|
|
* handler directly in the event, so that the handler can be deleted
|
| 578 |
|
|
* while the event is queued without leaving a dangling pointer.
|
| 579 |
|
|
*/
|
| 580 |
|
|
|
| 581 |
|
|
for (filePtr = notifier.firstFileHandlerPtr; filePtr != NULL;
|
| 582 |
|
|
filePtr = filePtr->nextPtr) {
|
| 583 |
|
|
if (filePtr->fd != fileEvPtr->fd) {
|
| 584 |
|
|
continue;
|
| 585 |
|
|
}
|
| 586 |
|
|
|
| 587 |
|
|
/*
|
| 588 |
|
|
* The code is tricky for two reasons:
|
| 589 |
|
|
* 1. The file handler's desired events could have changed
|
| 590 |
|
|
* since the time when the event was queued, so AND the
|
| 591 |
|
|
* ready mask with the desired mask.
|
| 592 |
|
|
* 2. The file could have been closed and re-opened since
|
| 593 |
|
|
* the time when the event was queued. This is why the
|
| 594 |
|
|
* ready mask is stored in the file handler rather than
|
| 595 |
|
|
* the queued event: it will be zeroed when a new
|
| 596 |
|
|
* file handler is created for the newly opened file.
|
| 597 |
|
|
*/
|
| 598 |
|
|
|
| 599 |
|
|
mask = filePtr->readyMask & filePtr->mask;
|
| 600 |
|
|
filePtr->readyMask = 0;
|
| 601 |
|
|
if (mask != 0) {
|
| 602 |
|
|
(*filePtr->proc)(filePtr->clientData, mask);
|
| 603 |
|
|
}
|
| 604 |
|
|
break;
|
| 605 |
|
|
}
|
| 606 |
|
|
return 1;
|
| 607 |
|
|
}
|
| 608 |
|
|
|
| 609 |
|
|
/*
|
| 610 |
|
|
*----------------------------------------------------------------------
|
| 611 |
|
|
*
|
| 612 |
|
|
* Tcl_WaitForEvent --
|
| 613 |
|
|
*
|
| 614 |
|
|
* This function is called by Tcl_DoOneEvent to wait for new
|
| 615 |
|
|
* events on the message queue. If the block time is 0, then
|
| 616 |
|
|
* Tcl_WaitForEvent just polls without blocking.
|
| 617 |
|
|
*
|
| 618 |
|
|
* Results:
|
| 619 |
|
|
* Returns 1 if an event was found, else 0. This ensures that
|
| 620 |
|
|
* Tcl_DoOneEvent will return 1, even if the event is handled
|
| 621 |
|
|
* by non-Tcl code.
|
| 622 |
|
|
*
|
| 623 |
|
|
* Side effects:
|
| 624 |
|
|
* Queues file events that are detected by the select.
|
| 625 |
|
|
*
|
| 626 |
|
|
*----------------------------------------------------------------------
|
| 627 |
|
|
*/
|
| 628 |
|
|
|
| 629 |
|
|
int
|
| 630 |
|
|
Tcl_WaitForEvent(
|
| 631 |
|
|
Tcl_Time *timePtr) /* Maximum block time, or NULL. */
|
| 632 |
|
|
{
|
| 633 |
|
|
int timeout;
|
| 634 |
|
|
|
| 635 |
|
|
if (!initialized) {
|
| 636 |
|
|
InitNotifier();
|
| 637 |
|
|
}
|
| 638 |
|
|
|
| 639 |
|
|
TclSetAppContext(NULL);
|
| 640 |
|
|
|
| 641 |
|
|
if (timePtr) {
|
| 642 |
|
|
timeout = timePtr->sec * 1000 + timePtr->usec / 1000;
|
| 643 |
|
|
if (timeout == 0) {
|
| 644 |
|
|
if (XtAppPending(notifier.appContext)) {
|
| 645 |
|
|
goto process;
|
| 646 |
|
|
} else {
|
| 647 |
|
|
return 0;
|
| 648 |
|
|
}
|
| 649 |
|
|
} else {
|
| 650 |
|
|
Tcl_SetTimer(timePtr);
|
| 651 |
|
|
}
|
| 652 |
|
|
}
|
| 653 |
|
|
process:
|
| 654 |
|
|
XtAppProcessEvent(notifier.appContext, XtIMAll);
|
| 655 |
|
|
return 1;
|
| 656 |
|
|
}
|
