FreeBSD Manual Pages
Tcl_CreateAlias(3) Tcl Library Procedures Tcl_CreateAlias(3) ______________________________________________________________________________ NAME Tcl_IsSafe, Tcl_MakeSafe, Tcl_CreateChild, Tcl_CreateSlave, Tcl_GetChild, Tcl_GetSlave, Tcl_GetParent, Tcl_GetMaster, Tcl_Get- InterpPath, Tcl_CreateAlias, Tcl_CreateAliasObj, Tcl_GetAlias, Tcl_GetAliasObj, Tcl_ExposeCommand, Tcl_HideCommand - manage multiple Tcl interpreters, aliases and hidden commands SYNOPSIS #include <tcl.h> int Tcl_IsSafe(interp) int Tcl_MakeSafe(interp) Tcl_Interp * 2 Tcl_CreateChild(interp, name, isSafe) 2 Tcl_Interp * Tcl_CreateSlave(interp, name, isSafe) Tcl_Interp * 2 Tcl_GetChild(interp, name) 2 Tcl_Interp * Tcl_GetSlave(interp, name) Tcl_Interp * 2 Tcl_GetParent(interp) 2 Tcl_Interp * Tcl_GetMaster(interp) int Tcl_GetInterpPath(interp, childInterp) int Tcl_CreateAlias(childInterp, childCmd, targetInterp, targetCmd, argc, argv) int Tcl_CreateAliasObj(childInterp, childCmd, targetInterp, targetCmd, objc, objv) int Tcl_GetAlias(interp, childCmd, targetInterpPtr, targetCmdPtr, argcPtr, argvPtr) int Tcl_GetAliasObj(interp, childCmd, targetInterpPtr, targetCmdPtr, objcPtr, objvPtr) int Tcl_ExposeCommand(interp, hiddenCmdName, cmdName) int Tcl_HideCommand(interp, cmdName, hiddenCmdName) ARGUMENTS Tcl_Interp *interp (in) Interpreter in which to execute the speci- fied command. const char *name (in) Name of child inter- preter to create or manipulate. int isSafe (in) If non-zero, a "safe" child that is suit- able for running un- trusted code is cre- ated, otherwise a trusted child is cre- ated. Tcl_Interp *childInterp (in) Interpreter to use for creating the source command for an alias (see below). const char *childCmd (in) Name of source com- mand for alias. Tcl_Interp *targetInterp (in) Interpreter that con- tains the target com- mand for an alias. const char *targetCmd (in) Name of target com- mand for alias in targetInterp. int argc (in) Count of additional arguments to pass to the alias command. const char *const *argv (in) Vector of strings, the additional argu- ments to pass to the alias command. This storage is owned by the caller. int objc (in) Count of additional value arguments to pass to the aliased command. Tcl_Obj **objv (in) Vector of Tcl_Obj structures, the addi- tional value argu- ments to pass to the aliased command. This storage is owned by the caller. Tcl_Interp **targetInterpPtr (in) Pointer to location to store the address of the interpreter where a target com- mand is defined for an alias. const char **targetCmdPtr (out) Pointer to location to store the address of the name of the target command for an alias. int *argcPtr (out) Pointer to location to store count of ad- ditional arguments to be passed to the alias. The location is in storage owned by the caller. const char ***argvPtr (out) Pointer to location to store a vector of strings, the addi- tional arguments to pass to an alias. The location is in stor- age owned by the caller, the vector of strings is owned by the called function. int *objcPtr (out) Pointer to location to store count of ad- ditional value argu- ments to be passed to the alias. The loca- tion is in storage owned by the caller. Tcl_Obj ***objvPtr (out) Pointer to location to store a vector of Tcl_Obj structures, the additional argu- ments to pass to an alias command. The location is in stor- age owned by the caller, the vector of Tcl_Obj structures is owned by the called function. const char *cmdName (in) Name of an exposed command to hide or create. const char *hiddenCmdName (in) Name under which a hidden command is stored and with which it can be exposed or invoked. ______________________________________________________________________________ DESCRIPTION These procedures are intended for access to the multiple interpreter facility from inside C programs. They enable managing multiple inter- preters in a hierarchical relationship, and the management of aliases, commands that when invoked in one interpreter execute a command in an- other interpreter. The return value for those procedures that return an int is either TCL_OK or TCL_ERROR. If TCL_ERROR is returned then the interpreter's result contains an error message. Tcl_CreateSlave creates a new interpreter as a child of interp. It also creates a child command named childName in interp which allows in- terp to manipulate the new child. If isSafe is zero, the command cre- ates a trusted child in which Tcl code has access to all the Tcl com- mands. If it is 1, the command creates a "safe" child in which Tcl code has access only to set of Tcl commands defined as "Safe Tcl"; see the manual entry for the Tcl interp command for details. If the cre- ation of the new child interpreter failed, NULL is returned. Tcl_CreateChild is a synonym for Tcl_CreateSlave. 2 Tcl_IsSafe returns 1 if interp is "safe" (was created with the TCL_SAFE_INTERPRETER flag specified), 0 otherwise. Tcl_MakeSafe marks interp as "safe", so that future calls to Tcl_IsSafe will return 1. It also removes all known potentially-unsafe core func- tionality (both commands and variables) from interp. However, it can- not know what parts of an extension or application are safe and does not make any attempt to remove those parts, so safety is not guaranteed after calling Tcl_MakeSafe. Callers will want to take care with their use of Tcl_MakeSafe to avoid false claims of safety. For many situa- tions, Tcl_CreateSlave may be a better choice, since it creates inter- preters in a known-safe state. Tcl_GetSlave returns a pointer to a child interpreter of interp. The child interpreter is identified by childName. If no such child inter- preter exists, NULL is returned. Tcl_GetChild is a synonym for Tcl_GetSlave. 2 Tcl_GetMaster returns a pointer to the master interpreter of interp. If interp has no master (it is a top-level interpreter) then NULL is re- turned. Tcl_GetParent is a synonym for Tcl_GetMaster. 2 Tcl_GetInterpPath stores in the result of interp the relative path be- tween interp and childInterp; childInterp must be a child of interp. If the computation of the relative path succeeds, TCL_OK is returned, else TCL_ERROR is returned and an error message is stored as the result of interp. Tcl_CreateAlias creates a command named childCmd in childInterp that when invoked, will cause the command targetCmd to be invoked in target- Interp. The arguments specified by the strings contained in argv are always prepended to any arguments supplied in the invocation of child- Cmd and passed to targetCmd. This operation returns TCL_OK if it suc- ceeds, or TCL_ERROR if it fails; in that case, an error message is left in the value result of childInterp. Note that there are no restric- tions on the ancestry relationship (as created by Tcl_CreateSlave) be- tween childInterp and targetInterp. Any two interpreters can be used, without any restrictions on how they are related. Tcl_CreateAliasObj is similar to Tcl_CreateAlias except that it takes a vector of values to pass as additional arguments instead of a vector of strings. Tcl_GetAliasObj returns information in the form of a pointer to a vec- tor of Tcl_Obj structures about an alias aliasName in interp. Any of the result fields can be NULL, in which case the corresponding datum is not returned. If a result field is non-NULL, the address indicated is set to the corresponding datum. For example, if targetCmdPtr is non-NULL it is set to a pointer to the string containing the name of the target command. Tcl_GetAlias is similar to Tcl_GetAliasObj except that it returns a pointer to a vector of string instead of a vector of Tcl_Obj struc- tures. Tcl_GetAlias is deprecated. Tcl_ExposeCommand moves the command named hiddenCmdName from the set of hidden commands to the set of exposed commands, putting it under the name cmdName. HiddenCmdName must be the name of an existing hidden command, or the operation will return TCL_ERROR and leave an error mes- sage as the result of interp. If an exposed command named cmdName al- ready exists, the operation returns TCL_ERROR and leaves an error mes- sage as the result of interp. If the operation succeeds, it returns TCL_OK. After executing this command, attempts to use cmdName in any script evaluation mechanism will again succeed. Tcl_HideCommand moves the command named cmdName from the set of exposed commands to the set of hidden commands, under the name hiddenCmdName. CmdName must be the name of an existing exposed command, or the opera- tion will return TCL_ERROR and leave an error message as the result of interp. Currently both cmdName and hiddenCmdName must not contain namespace qualifiers, or the operation will return TCL_ERROR and leave an error message as the result of interp. The CmdName will be looked up in the global namespace, and not relative to the current namespace, even if the current namespace is not the global one. If a hidden com- mand whose name is hiddenCmdName already exists, the operation also re- turns TCL_ERROR and an error message is left as the result of interp. If the operation succeeds, it returns TCL_OK. After executing this command, attempts to use cmdName in any script evaluation mechanism will fail. For a description of the Tcl interface to multiple interpreters, see interp(n). SEE ALSO interp KEYWORDS alias, command, exposed commands, hidden commands, interpreter, invoke, parent, child Tcl 7.6 Tcl_CreateAlias(3)
NAME | SYNOPSIS | ARGUMENTS | DESCRIPTION | SEE ALSO | KEYWORDS
Want to link to this manual page? Use this URL:
<https://man.freebsd.org/cgi/man.cgi?query=Tcl_CreateSlave.tcl86&sektion=3&manpath=FreeBSD+Ports+14.3.quarterly>