InitStubs man page on DigitalUNIX

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Tcl_InitStubs(3)	    Tcl Library Procedures	      Tcl_InitStubs(3)


       Tcl_InitStubs - initialize the Tcl stubs mechanism

       #include <tcl.h>

       char *
       Tcl_InitStubs(interp, version, exact)

       Tcl_Interp   *interp   (in)	Tcl interpreter handle.

       char	    *version  (in)	A  version string consisting of one or
					more  decimal  numbers	separated   by

       int	    exact     (in)	Non-zero  means that only the particu‐
					lar version specified  by  version  is
					acceptable.   Zero means that versions
					newer than version are also acceptable
					as  long  as  they have the same major
					version number as version.

       The Tcl stubs mechanism defines a way to dynamically bind extensions to
       a particular Tcl implementation at run time.  This provides two signif‐
       icant benefits to Tcl users:

       1)   Extensions that use the stubs mechanism can be loaded into	multi‐
	    ple versions of Tcl without being recompiled or relinked.

       2)   Extensions	that use the stubs mechanism can be dynamically loaded
	    into statically-linked Tcl applications.

       The stubs mechanism accomplishes this by exporting function tables that
       define  an  interface  to the Tcl API.  The extension then accesses the
       Tcl API through offsets into the function table, so there are no direct
       references  to  any  of the Tcl library's symbols.  This redirection is
       transparent to the extension, so an extension writer  can  continue  to
       use all public Tcl functions as documented.

       The  stubs  mechanism requires no changes to applications incorporating
       Tcl interpreters.  Only developers creating C-based Tcl extensions need
       to take steps to use the stubs mechanism with their extensions.

       Enabling	 the  stubs  mechanism for an extension requires the following

       1)   Call Tcl_InitStubs in the extension before calling any  other  Tcl

       2)   Define the USE_TCL_STUBS symbol.  Typically, you would include the
	    -DUSE_TCL_STUBS flag when compiling the extension.

       3)   Link the extension with the Tcl stubs library instead of the stan‐
	    dard  Tcl  library.	  On Unix platforms, the library name is libt‐
	    clstub8.1.a;  on  Windows	platforms,   the   library   name   is

       If  the	extension also requires the Tk API, it must also call Tk_Init‐
       Stubs to initialize the Tk stubs interface and link with the  Tk	 stubs
       libraries.  See the Tk_InitStubs page for more information.

       Tcl_InitStubs attempts to initialize the stub table pointers and ensure
       that the correct version of Tcl is loaded.  In addition	to  an	inter‐
       preter  handle,	it accepts as arguments a version number and a Boolean
       flag indicating whether the extension requires an exact	version	 match
       or  not.	  If  exact  is 0, then the extension is indicating that newer
       versions of Tcl are acceptable as long as they have the same major ver‐
       sion  number as version; non-zero means that only the specified version
       is acceptable.  Tcl_InitStubs returns a string  containing  the	actual
       version	of  Tcl	 satisfying the request, or NULL if the Tcl version is
       not acceptable, does not support stubs, or any  other  error  condition



Tcl				      8.1		      Tcl_InitStubs(3)

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