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NAME
     Tcl_FindExecutable, Tcl_GetNameOfExecutable  -  identify  or
     return  the  name of the binary file containing the applica-
     tion

SYNOPSIS
     #include <tcl.h>

     void
     Tcl_FindExecutable(argv0)

     CONST char *
     Tcl_GetNameOfExecutable()

ARGUMENTS
     char   *argv0   (in)      The first command-line argument to
                               the   program,   which  gives  the
                               application's name.
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DESCRIPTION
     The Tcl_FindExecutable procedure computes the full path name
     of  the  executable  file  from  which  the  application was
     invoked  and  saves  it  for  Tcl's   internal   use.    The
     executable's  path  name  is  needed for several purposes in
     Tcl.  For example, it is needed on  some  platforms  in  the
     implementation  of the load command.  It is also returned by
     the info nameofexecutable command.

     On UNIX platforms this procedure is typically invoked as the
     very first thing in the application's main program;  it must
     be passed argv[0] as its argument.  Tcl_FindExecutable  uses
     argv0  along  with the PATH environment variable to find the
     application's executable, if possible.  If it fails to  find
     the  binary, then future calls to info nameofexecutable will
     return an empty string.

     Tcl_GetNameOfExecutable simply  returns  a  pointer  to  the
     internal  full  path name of the executable file as computed
     by Tcl_FindExecutable.  This procedure call  is  the  C  API
     equivalent  to  the  info nameofexecutable command.  NULL is
     returned if the internal full path name has  not  been  com-
     puted or unknown.


KEYWORDS
     binary, executable file

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