'\"
'\" The contents of this file are subject to the AOLserver Public License
'\" Version 1.1 (the "License"); you may not use this file except in
'\" compliance with the License. You may obtain a copy of the License at
'\" http://aolserver.com/.
'\"
'\" Software distributed under the License is distributed on an "AS IS"
'\" basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
'\" the License for the specific language governing rights and limitations
'\" under the License.
'\"
'\" The Original Code is AOLserver Code and related documentation
'\" distributed by AOL.
'\" 
'\" The Initial Developer of the Original Code is America Online,
'\" Inc. Portions created by AOL are Copyright (C) 1999 America Online,
'\" Inc. All Rights Reserved.
'\"
'\" Alternatively, the contents of this file may be used under the terms
'\" of the GNU General Public License (the "GPL"), in which case the
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'\" to allow use of your version of this file only under the terms of the
'\" GPL and not to allow others to use your version of this file under the
'\" License, indicate your decision by deleting the provisions above and
'\" replace them with the notice and other provisions required by the GPL.
'\" If you do not delete the provisions above, a recipient may use your
'\" version of this file under either the License or the GPL.
'\" 
'\"
'\" $Header: /cvsroot/aolserver/aolserver/doc/Ns_TclInit.3,v 1.7 2004/07/29 22:43:36 dossy Exp $
'\"
'\" 
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.TH Ns_TclInit 3aolserver 4.0 AOLserver "AOLserver Library Procedures"
.BS
'\" Note:  do not modify the .SH NAME line immediately below!
.SH NAME
Ns_TclInitInterps, Ns_TclInitModule, Ns_TclInterpServer, Ns_TclLibrary \- library procedures
.SH SYNOPSIS
.nf
\fB#include "ns.h"\fR
.sp
int
\fBNs_TclInitInterps\fR(\fIserver, initProc, arg\fR)
.sp
\fBNs_TclInitModule\fR(\fIarg, arg\fR)
.sp
char *
\fBNs_TclInterpServer\fR(\fIinterp\fR)
.sp
char *
\fBNs_TclLibrary\fR(\fIvoid\fR)

.SH ARGUMENTS
.AS Ns_TclInterpInitProc initProc
.AP char *server in
Name of virtual server.
.AP Ns_TclInterpInitProc *initProc in
Procedure to call to initialize interps.
.AP void *arg in
Callback data to pass to \fIinitProc\fR.
.AP Tcl_Interp *interp in
Tcl interp to get server.
.BE

.SH DESCRIPTION
.PP
\fBNs_TclInitInterps\fR arranges for \fIinitProc\fR to be 
called on the startup initialization interp.
\fIinitProc\fR should have arguments and result that match the
type \fINs_TclInterpInitProc\fR:
.CS
typedef int Ns_TclInterpInitProc(Tcl_Interp \fI*interp\fR, void \fI*arg\fR);
.CE
The \fIarg\fR parameter to \fIinitProc\fR is a copy of the \fIarg\fR
argument given to \fBNs_TclInitInterps\fR.
A typical \fIinitProc\fR
will create new commands in the given interp with Tcl_CreateCommand.
The following AOLserver module example results in the \fImsg\fR
command being in all interps.  The command simply sets the "hello"
static string as the interp result:
.CS
static Ns_TclInterpInitProc AddCmds;
static Tcl_CmdProc MsgCmd;
int
Ns_ModuleInit(char *server, char *module)
{
    static char *arg = "hello";
    return Ns_TclInitInterps(server, AddCmds, arg);
}
static int
AddCmds(Tcl_Interp *interp, void *arg)
{
    Tcl_CreateCommand(interp, "msg", MsgCmd, arg, NULL);
    return TCL_OK;
}
static int
MsgCmd(ClientData arg, Tcl_Interp *interp, int argc, char **argv)
{
    Tcl_SetResult(interp, (char *) arg, TCL_STATIC);
    return TCL_OK;
}
.CE
In AOLserver 3.x, the effect of \fBNs_TclInitInterps\fR is to invoke
\fIinitProc\fR immediately on the single initializaton interp of the
server and the result of \fBNs_TclInitInterps\fR is the return code of
\fIinitProc\fR.  The state of this interp (command, procedures) will
then be copied to other interps when created via the
\fBNs_TclAllocInterp\fR routine.  This differs from the original
AOLserver 2.0 where \fIinitProc\fR was called on each interp in an
interp pool, the 2.1-2.3 behavior where \fIinitProc\fR was called once
on an interp linked to the per-server shared command tables, and the
upcoming 4.0 behavior where \fIinitProc\fR is called at interp create
time.  In fact, the 4.0 behavior is that of the
\fBNs_TclRegisterAtCreate\fR routine.  In practice, if your
\fIinitProc\fB does nothing but create commands with NULL or shared
client data the effect is the same in all releases.
.PP
\fBNs_TclInterpServer\fR returns the virtual server in which the given
interp was created.
.PP
\fBNs_TclLibrary\fR returns the shared Tcl library of the server installation
(e.g., /usr/local/aolserver/modules/tcl).


.SH "SEE ALSO"
Ns_TclRegisterAtCreate(3), Ns_TclAllocInterp(3)

.SH KEYWORDS