osx man page for tcl_sourcercfile

Tcl_SourceRCFile(3)					      Tcl Library Procedures					       Tcl_SourceRCFile(3)

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NAME
       Tcl_SourceRCFile - source the Tcl rc file

SYNOPSIS
       #include <tcl.h>

       void
       Tcl_SourceRCFile(interp)

ARGUMENTS
       Tcl_Interp *interp (in)		Tcl interpreter to source rc file into.
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DESCRIPTION
       Tcl_SourceRCFile  is  used  to  source  the  Tcl rc file at startup.  It is typically invoked by Tcl_Main or Tk_Main.  The name of the file
       sourced is obtained from the global variable tcl_rcFileName in the interpreter given by interp.	If this variable is not defined, or if the
       file it indicates cannot be found, no action is taken.

KEYWORDS
       application-specific initialization, main program, rc file

Tcl									8.3						       Tcl_SourceRCFile(3)