Tcl_UpVar2 man page on QNX

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Tcl_UpVar(3)		    Tcl Library Procedures		  Tcl_UpVar(3)


       Tcl_UpVar, Tcl_UpVar2 - link one variable to another

       #include <tcl.h>

       Tcl_UpVar(interp, frameName, sourceName, destName, flags)

       Tcl_UpVar2(interp, frameName, name1, name2, destName, flags)

       Tcl_Interp	  *interp	   (in)	     Interpreter    containing
						     variables;	 also used for
						     error reporting.

       CONST char	  *frameName	   (in)	     Identifies	   the	 stack
						     frame  containing	source
						     variable.	 May  have any
						     of the forms accepted  by
						     the  upvar	 command, such
						     as #0 or 1.

       CONST char	  *sourceName	   (in)	     Name of source  variable,
						     in	 the  frame  given  by
						     frameName.	 May refer  to
						     a	scalar	variable or to
						     an array variable with  a
						     parenthesized index.

       CONST char	  *destName	   (in)	     Name of destination vari‐
						     able,  which  is  to   be
						     linked to source variable
						     so	 that  references   to
						     destName	refer  to  the
						     other variable.  Must not
						     currently exist except as
						     an upvar-ed variable.

       int		  flags		   (in)	     Either TCL_GLOBAL_ONLY or
						     0;	   if  non-zero,  then
						     destName  is   a	global
						     variable;	 otherwise  it
						     is a local to the current
						     procedure	(or  global if
						     no procedure is active).

       CONST char	  *name1	   (in)	     First  part   of	source
						     variable's	 name  (scalar
						     name, or  name  of	 array
						     without array index).

       CONST char	  *name2	   (in)	     If	 source variable is an
						     element  of   an	array,
						     gives  the	 index	of the
						     element.	 For	scalar
						     source    variables,   is

       Tcl_UpVar and Tcl_UpVar2 provide the same functionality	as  the	 upvar
       command:	  they	make  a	 link  from a source variable to a destination
       variable, so that references to the destination	are  passed  transpar‐
       ently  through  to  the source.	The name of the source variable may be
       specified either as a single string such as xyx or  a(24)  (by  calling
       Tcl_UpVar) or in two parts where the array name has been separated from
       the element name (by calling  Tcl_UpVar2).   The	 destination  variable
       name is specified in a single string;  it may not be an array element.

       Both  procedures	 return	 either TCL_OK or TCL_ERROR, and they leave an
       error message in the interpreter's result if an error occurs.

       As with the upvar command, the source variable need not	exist;	if  it
       does exist, unsetting it later does not destroy the link.  The destina‐
       tion variable may exist at the time of the call,	 but  if  so  it  must
       exist as a linked variable.

       linked variable, upvar, variable

Tcl				      7.4			  Tcl_UpVar(3)
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