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Unix SMB/CIFS implementation.
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process model: prefork (n client connections per process)
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Copyright (C) Andrew Tridgell 1992-2005
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Copyright (C) James J Myers 2003 <myersjj@samba.org>
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Copyright (C) Stefan (metze) Metzmacher 2004
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Copyright (C) Andrew Bartlett 2008 <abartlet@samba.org>
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Copyright (C) David Disseldorp 2008 <ddiss@sgi.com>
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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#include "lib/events/events.h"
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#include "../tdb/include/tdb.h"
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#include "lib/socket/socket.h"
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#include "smbd/process_model.h"
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#include "param/secrets.h"
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#include "system/filesys.h"
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#include "cluster/cluster.h"
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#include "param/param.h"
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#ifdef HAVE_SETPROCTITLE
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#ifdef HAVE_SETPROCTITLE_H
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#include <setproctitle.h>
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#define setproctitle none_setproctitle
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static int none_setproctitle(const char *fmt, ...) PRINTF_ATTRIBUTE(1, 2);
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static int none_setproctitle(const char *fmt, ...)
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called when the process model is selected
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static void prefork_model_init(struct tevent_context *ev)
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signal(SIGCHLD, SIG_IGN);
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static void prefork_reload_after_fork(void)
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/* tdb needs special fork handling */
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if (tdb_reopen_all(1) == -1) {
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DEBUG(0,("prefork_reload_after_fork: tdb_reopen_all failed.\n"));
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/* Ensure that the forked children do not expose identical random streams */
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set_need_random_reseed();
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called when a listening socket becomes readable.
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static void prefork_accept_connection(struct tevent_context *ev,
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struct loadparm_context *lp_ctx,
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struct socket_context *listen_socket,
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void (*new_conn)(struct tevent_context *,
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struct loadparm_context *, struct socket_context *,
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struct server_id , void *),
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struct socket_context *connected_socket;
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/* accept an incoming connection. */
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status = socket_accept(listen_socket, &connected_socket);
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if (!NT_STATUS_IS_OK(status)) {
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talloc_steal(private_data, connected_socket);
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new_conn(ev, lp_ctx, connected_socket, cluster_id(pid, socket_get_fd(connected_socket)), private_data);
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called to create a new server task
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static void prefork_new_task(struct tevent_context *ev,
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struct loadparm_context *lp_ctx,
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const char *service_name,
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void (*new_task_fn)(struct tevent_context *, struct loadparm_context *lp_ctx, struct server_id , void *),
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struct tevent_context *ev2, *ev_parent;
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/* parent or error code ... go back to the event loop */
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/* This is now the child code. We need a completely new event_context to work with */
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ev2 = s4_event_context_init(NULL);
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/* the service has given us a private pointer that
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encapsulates the context it needs for this new connection -
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everything else will be freed */
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talloc_steal(ev2, private_data);
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/* this will free all the listening sockets and all state that
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is not associated with this new connection */
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setproctitle("task %s server_id[%d]", service_name, pid);
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prefork_reload_after_fork();
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/* setup this new connection: process will bind to it's sockets etc */
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new_task_fn(ev2, lp_ctx, cluster_id(pid, 0), private_data);
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num_children = lp_parm_int(lp_ctx, NULL, "prefork children", service_name, 0);
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if (num_children == 0) {
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/* We don't want any kids hanging around for this one,
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* let the parent do all the work */
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event_loop_wait(ev2);
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/* We are now free to spawn some child proccesses */
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for (i=0; i < num_children; i++) {
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} else if (pid == -1) {
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setproctitle("task %s server_id[%d]", service_name, pid);
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prefork_reload_after_fork();
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/* we can't return to the top level here, as that event context is gone,
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so we now process events in the new event context until there are no
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event_loop_wait(ev2);
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/* Don't listen on the sockets we just gave to the children */
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/* But we need a events system to handle reaping children */
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ev_parent = s4_event_context_init(NULL);
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/* TODO: Handle some events... */
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/* we can't return to the top level here, as that event context is gone,
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so we now process events in the new event context until there are no
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event_loop_wait(ev_parent);
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talloc_free(ev_parent);
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/* called when a task goes down */
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_NORETURN_ static void prefork_terminate(struct tevent_context *ev, struct loadparm_context *lp_ctx, const char *reason)
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DEBUG(2,("prefork_terminate: reason[%s]\n",reason));
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/* called to set a title of a task or connection */
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static void prefork_set_title(struct tevent_context *ev, const char *title)
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setproctitle("%s", title);
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static const struct model_ops prefork_ops = {
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.model_init = prefork_model_init,
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.accept_connection = prefork_accept_connection,
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.new_task = prefork_new_task,
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.terminate = prefork_terminate,
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.set_title = prefork_set_title,
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initialise the prefork process model, registering ourselves with the process model subsystem
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NTSTATUS process_model_prefork_init(void)
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return register_process_model(&prefork_ops);