2 Unix SMB/CIFS implementation.
4 process model: standard (1 process per client connection)
6 Copyright (C) Andrew Tridgell 1992-2005
7 Copyright (C) James J Myers 2003 <myersjj@samba.org>
8 Copyright (C) Stefan (metze) Metzmacher 2004
10 This program is free software; you can redistribute it and/or modify
11 it under the terms of the GNU General Public License as published by
12 the Free Software Foundation; either version 3 of the License, or
13 (at your option) any later version.
15 This program is distributed in the hope that it will be useful,
16 but WITHOUT ANY WARRANTY; without even the implied warranty of
17 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 GNU General Public License for more details.
20 You should have received a copy of the GNU General Public License
21 along with this program. If not, see <http://www.gnu.org/licenses/>.
25 #include "lib/events/events.h"
26 #include "smbd/process_model.h"
27 #include "system/filesys.h"
28 #include "cluster/cluster.h"
29 #include "param/param.h"
32 NTSTATUS process_model_standard_init(void);
34 /* we hold a pipe open in the parent, and the any child
35 processes wait for EOF on that pipe. This ensures that
36 children die when the parent dies */
37 static int child_pipe[2];
40 called when the process model is selected
42 static void standard_model_init(void)
45 signal(SIGCHLD, SIG_IGN);
49 handle EOF on the child pipe
51 static void standard_pipe_handler(struct tevent_context *event_ctx, struct tevent_fd *fde,
52 uint16_t flags, void *private_data)
54 DEBUG(10,("Child %d exiting\n", (int)getpid()));
59 called when a listening socket becomes readable.
61 static void standard_accept_connection(struct tevent_context *ev,
62 struct loadparm_context *lp_ctx,
63 struct socket_context *sock,
64 void (*new_conn)(struct tevent_context *,
65 struct loadparm_context *, struct socket_context *,
66 struct server_id , void *),
70 struct socket_context *sock2;
72 struct socket_address *c, *s;
74 /* accept an incoming connection. */
75 status = socket_accept(sock, &sock2);
76 if (!NT_STATUS_IS_OK(status)) {
77 DEBUG(0,("standard_accept_connection: accept: %s\n",
79 /* this looks strange, but is correct. We need to throttle things until
80 the system clears enough resources to handle this new socket */
88 /* parent or error code ... */
90 /* go back to the event loop */
96 /* This is now the child code. We need a completely new event_context to work with */
98 if (tevent_re_initialise(ev) != 0) {
99 smb_panic("Failed to re-initialise tevent after fork");
102 /* this will free all the listening sockets and all state that
103 is not associated with this new connection */
106 /* we don't care if the dup fails, as its only a select()
107 speed optimisation */
110 /* tdb needs special fork handling */
111 ldb_wrap_fork_hook();
113 tevent_add_fd(ev, ev, child_pipe[0], TEVENT_FD_READ,
114 standard_pipe_handler, NULL);
115 close(child_pipe[1]);
117 /* Ensure that the forked children do not expose identical random streams */
118 set_need_random_reseed();
120 /* setup the process title */
121 c = socket_get_peer_addr(sock2, ev);
122 s = socket_get_my_addr(sock2, ev);
124 setproctitle("conn c[%s:%u] s[%s:%u] server_id[%d]",
125 c->addr, c->port, s->addr, s->port, (int)pid);
130 /* setup this new connection. Cluster ID is PID based for this process model */
131 new_conn(ev, lp_ctx, sock2, cluster_id(pid, 0), private_data);
133 /* we can't return to the top level here, as that event context is gone,
134 so we now process events in the new event context until there are no
136 tevent_loop_wait(ev);
143 called to create a new server task
145 static void standard_new_task(struct tevent_context *ev,
146 struct loadparm_context *lp_ctx,
147 const char *service_name,
148 void (*new_task)(struct tevent_context *, struct loadparm_context *lp_ctx, struct server_id , void *),
156 /* parent or error code ... go back to the event loop */
162 /* this will free all the listening sockets and all state that
163 is not associated with this new connection */
164 if (tevent_re_initialise(ev) != 0) {
165 smb_panic("Failed to re-initialise tevent after fork");
168 /* ldb/tdb need special fork handling */
169 ldb_wrap_fork_hook();
171 tevent_add_fd(ev, ev, child_pipe[0], TEVENT_FD_READ,
172 standard_pipe_handler, NULL);
173 close(child_pipe[1]);
175 /* Ensure that the forked children do not expose identical random streams */
176 set_need_random_reseed();
178 setproctitle("task %s server_id[%d]", service_name, (int)pid);
180 /* setup this new task. Cluster ID is PID based for this process model */
181 new_task(ev, lp_ctx, cluster_id(pid, 0), private_data);
183 /* we can't return to the top level here, as that event context is gone,
184 so we now process events in the new event context until there are no
186 tevent_loop_wait(ev);
193 /* called when a task goes down */
194 _NORETURN_ static void standard_terminate(struct tevent_context *ev, struct loadparm_context *lp_ctx,
197 DEBUG(2,("standard_terminate: reason[%s]\n",reason));
201 /* this reload_charcnv() has the effect of freeing the iconv context memory,
202 which makes leak checking easier */
203 reload_charcnv(lp_ctx);
205 /* terminate this process */
209 /* called to set a title of a task or connection */
210 static void standard_set_title(struct tevent_context *ev, const char *title)
213 setproctitle("%s", title);
219 static const struct model_ops standard_ops = {
221 .model_init = standard_model_init,
222 .accept_connection = standard_accept_connection,
223 .new_task = standard_new_task,
224 .terminate = standard_terminate,
225 .set_title = standard_set_title,
229 initialise the standard process model, registering ourselves with the process model subsystem
231 NTSTATUS process_model_standard_init(void)
233 return register_process_model(&standard_ops);