NAME

       Tcl_FindExecutable,  Tcl_GetNameOfExecutable  -  identify or return the name of the binary
       file containing the application

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.  It  is  important
       not  to change the working directory before the invocation.  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.

       On Windows platforms this procedure is typically invoked as the very first  thing  in  the
       application's  main program as well; Its argv[0] argument is only used to indicate whether
       the executable has a stderr channel (any non-null value)  or  not  (the  value  null).  If
       Tcl_SetPanicProc  is  never called and no debugger is running, this determines whether the
       panic message is sent to stderr or to a standard system dialog.

       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 computed or unknown.

KEYWORDS

       binary, executable file