Tcl_Main(3) Tcl Library Procedures Tcl_Main(3)______________________________________________________________________________NAMETcl_Main - main program for Tcl-based applications
SYNOPSIS
#include <tcl.h>
Tcl_Main(argc, argv, appInitProc)
ARGUMENTS
int argc (in) Number of elements in argv.
char *argv[] (in) Array of strings containing
command-line arguments.
Tcl_AppInitProc *appInitProc (in) Address of an application-
specific initialization pro‐
cedure. The value for this
argument is usually
Tcl_AppInit.
_________________________________________________________________DESCRIPTIONTcl_Main acts as the main program for most Tcl-based applications.
Starting with Tcl 7.4 it is not called main anymore because it is part
of the Tcl library and having a function main in a library (particu‐
larly a shared library) causes problems on many systems. Having main
in the Tcl library would also make it hard to use Tcl in C++ programs,
since C++ programs must have special C++ main functions.
Normally each application contains a small main function that does
nothing but invoke Tcl_Main. Tcl_Main then does all the work of creat‐
ing and running a tclsh-like application.
When it is has finished its own initialization, but before it processes
commands, Tcl_Main calls the procedure given by the appInitProc argu‐
ment. This procedure provides a ``hook'' for the application to per‐
form its own initialization, such as defining application-specific com‐
mands. The procedure must have an interface that matches the type
Tcl_AppInitProc:
typedef int Tcl_AppInitProc(Tcl_Interp *interp);
AppInitProc is almost always a pointer to Tcl_AppInit; for more details
on this procedure, see the documentation for Tcl_AppInit.
KEYWORDS
application-specific initialization, command-line arguments, main pro‐
gram
Tcl 7.4 Tcl_Main(3)
