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/*
Unix SMB/CIFS implementation.
process model: prefork (n client connections per process)
Copyright (C) Andrew Tridgell 1992-2005
Copyright (C) James J Myers 2003 <myersjj@samba.org>
Copyright (C) Stefan (metze) Metzmacher 2004
Copyright (C) Andrew Bartlett 2008 <abartlet@samba.org>
Copyright (C) David Disseldorp 2008 <ddiss@sgi.com>
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 "lib/events/events.h"
#include "lib/socket/socket.h"
#include "smbd/process_model.h"
#include "system/filesys.h"
#include "cluster/cluster.h"
#include "param/param.h"
#include "ldb_wrap.h"
NTSTATUS process_model_prefork_init(void);
/*
called when the process model is selected
*/
static void prefork_model_init(void)
{
signal(SIGCHLD, SIG_IGN);
}
static void prefork_reload_after_fork(void)
{
ldb_wrap_fork_hook();
/* Ensure that the forked children do not expose identical random streams */
set_need_random_reseed();
}
/*
called when a listening socket becomes readable.
*/
static void prefork_accept_connection(struct tevent_context *ev,
struct loadparm_context *lp_ctx,
struct socket_context *listen_socket,
void (*new_conn)(struct tevent_context *,
struct loadparm_context *, struct socket_context *,
struct server_id , void *),
void *private_data)
{
NTSTATUS status;
struct socket_context *connected_socket;
pid_t pid = getpid();
/* accept an incoming connection. */
status = socket_accept(listen_socket, &connected_socket);
if (!NT_STATUS_IS_OK(status)) {
return;
}
talloc_steal(private_data, connected_socket);
new_conn(ev, lp_ctx, connected_socket, cluster_id(pid, socket_get_fd(connected_socket)), private_data);
}
/*
called to create a new server task
*/
static void prefork_new_task(struct tevent_context *ev,
struct loadparm_context *lp_ctx,
const char *service_name,
void (*new_task_fn)(struct tevent_context *, struct loadparm_context *lp_ctx, struct server_id , void *),
void *private_data)
{
pid_t pid;
int i, num_children;
struct tevent_context *ev2, *ev_parent;
pid = fork();
if (pid != 0) {
/* parent or error code ... go back to the event loop */
return;
}
pid = getpid();
/* This is now the child code. We need a completely new event_context to work with */
ev2 = s4_event_context_init(NULL);
/* the service has given us a private pointer that
encapsulates the context it needs for this new connection -
everything else will be freed */
talloc_steal(ev2, private_data);
/* this will free all the listening sockets and all state that
is not associated with this new connection */
talloc_free(ev);
setproctitle("task %s server_id[%d]", service_name, (int)pid);
prefork_reload_after_fork();
/* setup this new connection: process will bind to it's sockets etc */
new_task_fn(ev2, lp_ctx, cluster_id(pid, 0), private_data);
num_children = lpcfg_parm_int(lp_ctx, NULL, "prefork children", service_name, 0);
if (num_children == 0) {
/* We don't want any kids hanging around for this one,
* let the parent do all the work */
tevent_loop_wait(ev2);
talloc_free(ev2);
exit(0);
}
/* We are now free to spawn some child proccesses */
for (i=0; i < num_children; i++) {
pid = fork();
if (pid > 0) {
continue;
} else if (pid == -1) {
return;
} else {
pid = getpid();
setproctitle("task %s server_id[%d]", service_name, (int)pid);
prefork_reload_after_fork();
/* we can't return to the top level here, as that event context is gone,
so we now process events in the new event context until there are no
more to process */
tevent_loop_wait(ev2);
talloc_free(ev2);
exit(0);
}
}
/* Don't listen on the sockets we just gave to the children */
talloc_free(ev2);
/* But we need a events system to handle reaping children */
ev_parent = s4_event_context_init(NULL);
/* TODO: Handle some events... */
/* we can't return to the top level here, as that event context is gone,
so we now process events in the new event context until there are no
more to process */
tevent_loop_wait(ev_parent);
talloc_free(ev_parent);
exit(0);
}
/* called when a task goes down */
static void prefork_terminate(struct tevent_context *ev, struct loadparm_context *lp_ctx, const char *reason)
{
DEBUG(2,("prefork_terminate: reason[%s]\n",reason));
}
/* called to set a title of a task or connection */
static void prefork_set_title(struct tevent_context *ev, const char *title)
{
if (title) {
setproctitle("%s", title);
} else {
setproctitle(NULL);
}
}
static const struct model_ops prefork_ops = {
.name = "prefork",
.model_init = prefork_model_init,
.accept_connection = prefork_accept_connection,
.new_task = prefork_new_task,
.terminate = prefork_terminate,
.set_title = prefork_set_title,
};
/*
initialise the prefork process model, registering ourselves with the process model subsystem
*/
NTSTATUS process_model_prefork_init(void)
{
return register_process_model(&prefork_ops);
}
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