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Tcl_CreateSlave(3)	    Tcl Library Procedures	    Tcl_CreateSlave(3)

______________________________________________________________________________

NAME
       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

SYNOPSIS
       #include <tcl.h>

       int
       Tcl_IsSafe(interp)

       int
       Tcl_MakeSafe(interp)

       Tcl_Interp *
       Tcl_CreateSlave(interp, slaveName, isSafe)

       Tcl_Interp *
       Tcl_GetSlave(interp, slaveName)

       Tcl_Interp *
       Tcl_GetMaster(interp)

       int
       Tcl_GetInterpPath(askingInterp, slaveInterp)

       int
       Tcl_CreateAlias(slaveInterp, slaveCmd, targetInterp, targetCmd,
		       argc, argv)

       int
       Tcl_CreateAliasObj(slaveInterp, slaveCmd, targetInterp, targetCmd,
			  objc, objv)

       int
       Tcl_GetAlias(interp, slaveCmd, targetInterpPtr, targetCmdPtr,
		    argcPtr, argvPtr)

       int
       Tcl_GetAliasObj(interp, slaveCmd, 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 *slaveName (in)			 Name of slave	inter‐
							 preter	 to  create or
							 manipulate.

       int isSafe (in)					 If non-zero, a “safe”
							 slave	that  is suit‐
							 able	for    running
							 untrusted   code   is
							 created, otherwise  a
							 trusted slave is cre‐
							 ated.

       Tcl_Interp *slaveInterp (in)			 Interpreter  to   use
							 for	creating   the
							 source command for an
							 alias (see below).

       const char *slaveCmd (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
							 object	 arguments  to
							 pass	to  the	 alias
							 object command.

       Tcl_Obj **objv (in)				 Vector	  of   Tcl_Obj
							 structures, the addi‐
							 tional	 object	 argu‐
							 ments	to pass to the
							 alias object 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
							 additional  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
							 additional	object
							 arguments    to    be
							 passed to the	alias.
							 The  location	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
							 object alias command.
							 The  location	is  in
							 storage 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
       another 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
       result field of the interpreter contains an error message.

       Tcl_CreateSlave creates a new interpreter as a  slave  of  interp.   It
       also  creates  a	 slave	command named slaveName in interp which allows
       interp to manipulate the new slave.  If isSafe  is  zero,  the  command
       creates	a  trusted  slave  in which Tcl code has access to all the Tcl
       commands.  If it is 1, the command creates a “safe” slave 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 slave interpreter failed, NULL is returned.

       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 slave interpreter  of  interp.  The
       slave  interpreter is identified by slaveName.  If no such slave inter‐
       preter exists, NULL is returned.

       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
       returned.

       Tcl_GetInterpPath sets the result field in askingInterp to the relative
       path  between askingInterp and slaveInterp; slaveInterp must be a slave
       of askingInterp. If the computation  of	the  relative  path  succeeds,
       TCL_OK  is returned, else TCL_ERROR is returned and the result field in
       askingInterp contains the error message.

       Tcl_CreateAlias creates an object command named slaveCmd in slaveInterp
       that  when  invoked,  will cause the command targetCmd to be invoked in
       targetInterp. The arguments specified by the strings contained in  argv
       are  always  prepended  to  any arguments supplied in the invocation of
       slaveCmd and passed to targetCmd.  This operation returns TCL_OK if  it
       succeeds,  or  TCL_ERROR if it fails; in that case, an error message is
       left in the object result of  slaveInterp.   Note  that	there  are  no
       restrictions  on	 the  ancestry	relationship  (as  created by Tcl_Cre‐
       ateSlave) between slaveInterp 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 objects to pass as additional arguments instead of  a	vector
       of strings.

       Tcl_GetAlias  returns  information  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 indi‐
       cated is set to the corresponding datum.	 For example, if targetNamePtr
       is non-NULL it is set to a pointer to the string containing the name of
       the target command.

       Tcl_GetAliasObj is similar to Tcl_GetAlias except  that	it  returns  a
       pointer	to  a  vector  of  Tcl_Obj  structures	instead of a vector of
       strings.

       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 in the result field in interp.  If an exposed command  named  cmd‐
       Name  already  exists,  the  operation  returns TCL_ERROR and leaves an
       error message in the object result of interp.  If  the  operation  suc‐
       ceeds,  it  returns  TCL_OK.  After executing this command, attempts to
       use cmdName in a call to Tcl_Eval or with the  Tcl  eval	 command  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  in  the	object
       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 in the object result of interp.  The CmdName
       will be looked up in the global namespace, and not relative to the cur‐
       rent  namespace,	 even  if the current namespace is not the global one.
       If a hidden command whose name is  hiddenCmdName	 already  exists,  the
       operation  also	returns	 TCL_ERROR and the result field in interp con‐
       tains an error message.	If the operation succeeds, it returns  TCL_OK.
       After  executing	 this  command,	 attempts  to use cmdName in a call to
       Tcl_Eval or with the Tcl eval command 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,
       master, slave

Tcl				      7.6		    Tcl_CreateSlave(3)
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