source: vendor/3.5.11/source4/smbd/service_task.c

/* 
   Unix SMB/CIFS implementation.

   helper functions for task based servers (nbtd, winbind etc)

   Copyright (C) Andrew Tridgell 2005
   
   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 3 of the License, or
   (at your option) any later version.
   
   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.
   
   You should have received a copy of the GNU General Public License
   along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/

#include "includes.h"
#include "process_model.h"
#include "lib/messaging/irpc.h"
#include "param/param.h"
#include "librpc/gen_ndr/ndr_irpc.h"

/*
  terminate a task service
*/
void task_server_terminate(struct task_server *task, const char *reason, bool fatal)
{
        struct tevent_context *event_ctx = task->event_ctx;
        const struct model_ops *model_ops = task->model_ops;
        DEBUG(0,("task_server_terminate: [%s]\n", reason));

        if (fatal) {
                struct samba_terminate r;
                struct server_id *sid;

                sid = irpc_servers_byname(task->msg_ctx, task, "samba");

                r.in.reason = reason;
                IRPC_CALL(task->msg_ctx, sid[0],
                          irpc, SAMBA_TERMINATE,
                          &r, NULL);
        }

        model_ops->terminate(event_ctx, task->lp_ctx, reason);
        
        /* don't free this above, it might contain the 'reason' being printed */
        talloc_free(task);
}

/* used for the callback from the process model code */
struct task_state {
        void (*task_init)(struct task_server *);
        const struct model_ops *model_ops;
};


/*
  called by the process model code when the new task starts up. This then calls
  the server specific startup code
*/
static void task_server_callback(struct tevent_context *event_ctx, 
                                 struct loadparm_context *lp_ctx,
                                 struct server_id server_id, void *private_data)
{
        struct task_state *state = talloc_get_type(private_data, struct task_state);
        struct task_server *task;

        task = talloc(event_ctx, struct task_server);
        if (task == NULL) return;

        task->event_ctx = event_ctx;
        task->model_ops = state->model_ops;
        task->server_id = server_id;
        task->lp_ctx = lp_ctx;

        task->msg_ctx = messaging_init(task, 
                                       lp_messaging_path(task, task->lp_ctx),
                                       task->server_id, 
                                       lp_iconv_convenience(task->lp_ctx),
                                       task->event_ctx);
        if (!task->msg_ctx) {
                task_server_terminate(task, "messaging_init() failed", true);
                return;
        }

        state->task_init(task);
}

/*
  startup a task based server
*/
NTSTATUS task_server_startup(struct tevent_context *event_ctx, 
                             struct loadparm_context *lp_ctx,
                             const char *service_name, 
                             const struct model_ops *model_ops, 
                             void (*task_init)(struct task_server *))
{
        struct task_state *state;

        state = talloc(event_ctx, struct task_state);
        NT_STATUS_HAVE_NO_MEMORY(state);

        state->task_init = task_init;
        state->model_ops = model_ops;
        
        model_ops->new_task(event_ctx, lp_ctx, service_name, task_server_callback, state);

        return NT_STATUS_OK;
}

/*
  setup a task title 
*/
void task_server_set_title(struct task_server *task, const char *title)
{
        task->model_ops->set_title(task->event_ctx, title);
}