CentOS 7.0 - man page for tcl_appinit (centos section 3)
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Tcl_AppInit(3) Tcl Library Procedures Tcl_AppInit(3)
Tcl_AppInit - perform application-specific initialization
Tcl_Interp *interp (in) Interpreter for the application.
Tcl_AppInit is a "hook" procedure that is invoked by the main programs for Tcl applica-
tions such as tclsh and wish. Its purpose is to allow new Tcl applications to be created
without modifying the main programs provided as part of Tcl and Tk. To create a new
application you write a new version of Tcl_AppInit to replace the default version provided
by Tcl, then link your new Tcl_AppInit with the Tcl library.
Tcl_AppInit is invoked by Tcl_Main and Tk_Main after their own initialization and before
entering the main loop to process commands. Here are some examples of things that
Tcl_AppInit might do:
 Call initialization procedures for various packages used by the application. Each
initialization procedure adds new commands to interp for its package and performs
other package-specific initialization.
 Process command-line arguments, which can be accessed from the Tcl variables argv
and argv0 in interp.
 Invoke a startup script to initialize the application.
Tcl_AppInit returns TCL_OK or TCL_ERROR. If it returns TCL_ERROR then it must leave an
error message in for the interpreter's result; otherwise the result is ignored.
In addition to Tcl_AppInit, your application should also contain a procedure main that
calls Tcl_Main as follows:
Tcl_Main(argc, argv, Tcl_AppInit);
The third argument to Tcl_Main gives the address of the application-specific initializa-
tion procedure to invoke. This means that you do not have to use the name Tcl_AppInit for
the procedure, but in practice the name is nearly always Tcl_AppInit (in versions before
Tcl 7.4 the name Tcl_AppInit was implicit; there was no way to specify the procedure
explicitly). The best way to get started is to make a copy of the file tclAppInit.c from
the Tcl library or source directory. It already contains a main procedure and a template
for Tcl_AppInit that you can modify for your application.
application, argument, command, initialization, interpreter
Tcl 7.0 Tcl_AppInit(3)
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