| 1 | '\" |
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| 61 | '\" .OP cmdName dbName dbClass |
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| 71 | '\" |
| 72 | '\" # Set up traps and other miscellaneous stuff for Tcl/Tk man pages. |
| 73 | .if t .wh -1.3i ^B |
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| 106 | .. |
| 107 | .AS Tcl_Interp Tcl_CreateInterp in/out |
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| 207 | .SH "STANDARD OPTIONS" |
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| 218 | See the \\fBoptions\\fR manual entry for details on the standard options. |
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| 225 | Command-Line Name: \\fB\\$1\\fR |
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| 243 | \\$1\l'|0\(ul'\\$2 |
| 244 | .. |
| 245 | .TH Tcl_CreateSlave 3 7.6 Tcl "Tcl Library Procedures" |
| 246 | .BS |
| 247 | .SH NAME |
| 248 | Tcl_IsSafe, Tcl_MakeSafe, Tcl_CreateSlave, Tcl_GetSlave, Tcl_GetMaster, Tcl_GetInterpPath, Tcl_CreateAlias, Tcl_CreateAliasObj, Tcl_GetAlias, Tcl_GetAliasObj, Tcl_ExposeCommand, Tcl_HideCommand \- manage multiple Tcl interpreters, aliases and hidden commands. |
| 249 | .SH SYNOPSIS |
| 250 | .nf |
| 251 | \fB#include <tcl.h>\fR |
| 252 | .sp |
| 253 | int |
| 254 | \fBTcl_IsSafe\fR(\fIinterp\fR) |
| 255 | .sp |
| 256 | int |
| 257 | \fBTcl_MakeSafe\fR(\fIinterp\fR) |
| 258 | .sp |
| 259 | Tcl_Interp * |
| 260 | \fBTcl_CreateSlave\fR(\fIinterp, slaveName, isSafe\fR) |
| 261 | .sp |
| 262 | Tcl_Interp * |
| 263 | \fBTcl_GetSlave\fR(\fIinterp, slaveName\fR) |
| 264 | .sp |
| 265 | Tcl_Interp * |
| 266 | \fBTcl_GetMaster\fR(\fIinterp\fR) |
| 267 | .sp |
| 268 | int |
| 269 | \fBTcl_GetInterpPath\fR(\fIaskingInterp, slaveInterp\fR) |
| 270 | .sp |
| 271 | .VS |
| 272 | int |
| 273 | \fBTcl_CreateAlias\fR(\fIslaveInterp, slaveCmd, targetInterp, targetCmd, argc, argv\fR) |
| 274 | .sp |
| 275 | int |
| 276 | \fBTcl_CreateAliasObj\fR(\fIslaveInterp, slaveCmd, targetInterp, targetCmd, objc, objv\fR) |
| 277 | .VE |
| 278 | .sp |
| 279 | int |
| 280 | \fBTcl_GetAlias\fR(\fIinterp, slaveCmd, targetInterpPtr, targetCmdPtr, argcPtr, argvPtr\fR) |
| 281 | .sp |
| 282 | .VS |
| 283 | int |
| 284 | \fBTcl_GetAliasObj\fR(\fIinterp, slaveCmd, targetInterpPtr, targetCmdPtr, objcPtr, objvPtr\fR) |
| 285 | .sp |
| 286 | int |
| 287 | \fBTcl_ExposeCommand\fR(\fIinterp, hiddenCmdName, cmdName\fR) |
| 288 | .sp |
| 289 | int |
| 290 | \fBTcl_HideCommand\fR(\fIinterp, cmdName, hiddenCmdName\fR) |
| 291 | .SH ARGUMENTS |
| 292 | .AS Tcl_InterpDeleteProc **hiddenCmdName |
| 293 | .AP Tcl_Interp *interp in |
| 294 | Interpreter in which to execute the specified command. |
| 295 | .AP "CONST char" *slaveName in |
| 296 | Name of slave interpreter to create or manipulate. |
| 297 | .AP int isSafe in |
| 298 | If non-zero, a ``safe'' slave that is suitable for running untrusted code |
| 299 | is created, otherwise a trusted slave is created. |
| 300 | .AP Tcl_Interp *slaveInterp in |
| 301 | Interpreter to use for creating the source command for an alias (see |
| 302 | below). |
| 303 | .AP "CONST char" *slaveCmd in |
| 304 | Name of source command for alias. |
| 305 | .AP Tcl_Interp *targetInterp in |
| 306 | Interpreter that contains the target command for an alias. |
| 307 | .AP "CONST char" *targetCmd in |
| 308 | Name of target command for alias in \fItargetInterp\fR. |
| 309 | .AP int argc in |
| 310 | Count of additional arguments to pass to the alias command. |
| 311 | .AP "CONST char * CONST" *argv in |
| 312 | Vector of strings, the additional arguments to pass to the alias command. |
| 313 | This storage is owned by the caller. |
| 314 | .AP int objc in |
| 315 | Count of additional object arguments to pass to the alias object command. |
| 316 | .AP Tcl_Object **objv in |
| 317 | Vector of Tcl_Obj structures, the additional object arguments to pass to |
| 318 | the alias object command. |
| 319 | This storage is owned by the caller. |
| 320 | .AP Tcl_Interp **targetInterpPtr in |
| 321 | Pointer to location to store the address of the interpreter where a target |
| 322 | command is defined for an alias. |
| 323 | .AP "CONST char" **targetCmdPtr out |
| 324 | Pointer to location to store the address of the name of the target command |
| 325 | for an alias. |
| 326 | .AP int *argcPtr out |
| 327 | Pointer to location to store count of additional arguments to be passed to |
| 328 | the alias. The location is in storage owned by the caller. |
| 329 | .AP "CONST char" ***argvPtr out |
| 330 | Pointer to location to store a vector of strings, the additional arguments |
| 331 | to pass to an alias. The location is in storage owned by the caller, the |
| 332 | vector of strings is owned by the called function. |
| 333 | .AP int *objcPtr out |
| 334 | Pointer to location to store count of additional object arguments to be |
| 335 | passed to the alias. The location is in storage owned by the caller. |
| 336 | .AP Tcl_Obj ***objvPtr out |
| 337 | Pointer to location to store a vector of Tcl_Obj structures, the additional |
| 338 | arguments to pass to an object alias command. The location is in storage |
| 339 | owned by the caller, the vector of Tcl_Obj structures is owned by the |
| 340 | called function. |
| 341 | .VS |
| 342 | .VS 8.4 |
| 343 | .AP "CONST char" *cmdName in |
| 344 | .VE |
| 345 | Name of an exposed command to hide or create. |
| 346 | .VS 8.4 |
| 347 | .AP "CONST char" *hiddenCmdName in |
| 348 | .VE |
| 349 | Name under which a hidden command is stored and with which it can be |
| 350 | exposed or invoked. |
| 351 | .VE |
| 352 | .BE |
| 353 | |
| 354 | .SH DESCRIPTION |
| 355 | .PP |
| 356 | These procedures are intended for access to the multiple interpreter |
| 357 | facility from inside C programs. They enable managing multiple interpreters |
| 358 | in a hierarchical relationship, and the management of aliases, commands |
| 359 | that when invoked in one interpreter execute a command in another |
| 360 | interpreter. The return value for those procedures that return an \fBint\fR |
| 361 | is either \fBTCL_OK\fR or \fBTCL_ERROR\fR. If \fBTCL_ERROR\fR is returned |
| 362 | then the \fBresult\fR field of the interpreter contains an error message. |
| 363 | .PP |
| 364 | \fBTcl_CreateSlave\fR creates a new interpreter as a slave of \fIinterp\fR. |
| 365 | It also creates a slave command named \fIslaveName\fR in \fIinterp\fR which |
| 366 | allows \fIinterp\fR to manipulate the new slave. |
| 367 | If \fIisSafe\fR is zero, the command creates a trusted slave in which Tcl |
| 368 | code has access to all the Tcl commands. |
| 369 | If it is \fB1\fR, the command creates a ``safe'' slave in which Tcl code |
| 370 | has access only to set of Tcl commands defined as ``Safe Tcl''; see the |
| 371 | manual entry for the Tcl \fBinterp\fR command for details. |
| 372 | If the creation of the new slave interpreter failed, \fBNULL\fR is returned. |
| 373 | .PP |
| 374 | \fBTcl_IsSafe\fR returns \fB1\fR if \fIinterp\fR is ``safe'' (was created |
| 375 | with the \fBTCL_SAFE_INTERPRETER\fR flag specified), |
| 376 | \fB0\fR otherwise. |
| 377 | .PP |
| 378 | \fBTcl_MakeSafe\fR marks \fIinterp\fR as ``safe'', so that future |
| 379 | calls to \fBTcl_IsSafe\fR will return 1. It also removes all known |
| 380 | potentially-unsafe core functionality (both commands and variables) |
| 381 | from \fIinterp\fR. However, it cannot know what parts of an extension |
| 382 | or application are safe and does not make any attempt to remove those |
| 383 | parts, so safety is not guaranteed after calling \fBTcl_MakeSafe\fR. |
| 384 | Callers will want to take care with their use of \fBTcl_MakeSafe\fR |
| 385 | to avoid false claims of safety. For many situations, \fBTcl_CreateSlave\fR |
| 386 | may be a better choice, since it creates interpreters in a known-safe state. |
| 387 | .PP |
| 388 | \fBTcl_GetSlave\fR returns a pointer to a slave interpreter of |
| 389 | \fIinterp\fR. The slave interpreter is identified by \fIslaveName\fR. |
| 390 | If no such slave interpreter exists, \fBNULL\fR is returned. |
| 391 | .PP |
| 392 | \fBTcl_GetMaster\fR returns a pointer to the master interpreter of |
| 393 | \fIinterp\fR. If \fIinterp\fR has no master (it is a |
| 394 | top-level interpreter) then \fBNULL\fR is returned. |
| 395 | .PP |
| 396 | \fBTcl_GetInterpPath\fR sets the \fIresult\fR field in \fIaskingInterp\fR |
| 397 | to the relative path between \fIaskingInterp\fR and \fIslaveInterp\fR; |
| 398 | \fIslaveInterp\fR must be a slave of \fIaskingInterp\fR. If the computation |
| 399 | of the relative path succeeds, \fBTCL_OK\fR is returned, else |
| 400 | \fBTCL_ERROR\fR is returned and the \fIresult\fR field in |
| 401 | \fIaskingInterp\fR contains the error message. |
| 402 | .PP |
| 403 | .VS |
| 404 | \fBTcl_CreateAlias\fR creates an object command named \fIslaveCmd\fR in |
| 405 | \fIslaveInterp\fR that when invoked, will cause the command \fItargetCmd\fR |
| 406 | to be invoked in \fItargetInterp\fR. The arguments specified by the strings |
| 407 | contained in \fIargv\fR are always prepended to any arguments supplied in the |
| 408 | invocation of \fIslaveCmd\fR and passed to \fItargetCmd\fR. |
| 409 | This operation returns \fBTCL_OK\fR if it succeeds, or \fBTCL_ERROR\fR if |
| 410 | it fails; in that case, an error message is left in the object result |
| 411 | of \fIslaveInterp\fR. |
| 412 | Note that there are no restrictions on the ancestry relationship (as |
| 413 | created by \fBTcl_CreateSlave\fR) between \fIslaveInterp\fR and |
| 414 | \fItargetInterp\fR. Any two interpreters can be used, without any |
| 415 | restrictions on how they are related. |
| 416 | .PP |
| 417 | \fBTcl_CreateAliasObj\fR is similar to \fBTcl_CreateAlias\fR except |
| 418 | that it takes a vector of objects to pass as additional arguments instead |
| 419 | of a vector of strings. |
| 420 | .VE |
| 421 | .PP |
| 422 | \fBTcl_GetAlias\fR returns information about an alias \fIaliasName\fR |
| 423 | in \fIinterp\fR. Any of the result fields can be \fBNULL\fR, in |
| 424 | which case the corresponding datum is not returned. If a result field is |
| 425 | non\-\fBNULL\fR, the address indicated is set to the corresponding datum. |
| 426 | For example, if \fItargetNamePtr\fR is non\-\fBNULL\fR it is set to a |
| 427 | pointer to the string containing the name of the target command. |
| 428 | .VS |
| 429 | .PP |
| 430 | \fBTcl_GetAliasObj\fR is similar to \fBTcl_GetAlias\fR except that it |
| 431 | returns a pointer to a vector of Tcl_Obj structures instead of a vector of |
| 432 | strings. |
| 433 | .PP |
| 434 | \fBTcl_ExposeCommand\fR moves the command named \fIhiddenCmdName\fR from |
| 435 | the set of hidden commands to the set of exposed commands, putting |
| 436 | it under the name |
| 437 | \fIcmdName\fR. |
| 438 | \fIHiddenCmdName\fR must be the name of an existing hidden |
| 439 | command, or the operation will return \fBTCL_ERROR\fR and leave an error |
| 440 | message in the \fIresult\fR field in \fIinterp\fR. |
| 441 | If an exposed command named \fIcmdName\fR already exists, |
| 442 | the operation returns \fBTCL_ERROR\fR and leaves an error message in the |
| 443 | object result of \fIinterp\fR. |
| 444 | If the operation succeeds, it returns \fBTCL_OK\fR. |
| 445 | After executing this command, attempts to use \fIcmdName\fR in a call to |
| 446 | \fBTcl_Eval\fR or with the Tcl \fBeval\fR command will again succeed. |
| 447 | .PP |
| 448 | \fBTcl_HideCommand\fR moves the command named \fIcmdName\fR from the set of |
| 449 | exposed commands to the set of hidden commands, under the name |
| 450 | \fIhiddenCmdName\fR. |
| 451 | \fICmdName\fR must be the name of an existing exposed |
| 452 | command, or the operation will return \fBTCL_ERROR\fR and leave an error |
| 453 | message in the object result of \fIinterp\fR. |
| 454 | Currently both \fIcmdName\fR and \fIhiddenCmdName\fR must not contain |
| 455 | namespace qualifiers, or the operation will return \fBTCL_ERROR\fR and |
| 456 | leave an error message in the object result of \fIinterp\fR. |
| 457 | The \fICmdName\fR will be looked up in the global namespace, and not |
| 458 | relative to the current namespace, even if the current namespace is not the |
| 459 | global one. |
| 460 | If a hidden command whose name is \fIhiddenCmdName\fR already |
| 461 | exists, the operation also returns \fBTCL_ERROR\fR and the \fIresult\fR |
| 462 | field in \fIinterp\fR contains an error message. |
| 463 | If the operation succeeds, it returns \fBTCL_OK\fR. |
| 464 | After executing this command, attempts to use \fIcmdName\fR in a call to |
| 465 | \fBTcl_Eval\fR or with the Tcl \fBeval\fR command will fail. |
| 466 | .PP |
| 467 | For a description of the Tcl interface to multiple interpreters, see |
| 468 | \fIinterp(n)\fR. |
| 469 | .SH "SEE ALSO" |
| 470 | interp |
| 471 | |
| 472 | .SH KEYWORDS |
| 473 | alias, command, exposed commands, hidden commands, interpreter, invoke, |
| 474 | master, slave |