1/*
2   Unix SMB/CIFS implementation.
3   process model manager - main loop
4   Copyright (C) Andrew Tridgell 1992-2003
5   Copyright (C) James J Myers 2003 <myersjj@samba.org>
6
7   This program is free software; you can redistribute it and/or modify
8   it under the terms of the GNU General Public License as published by
9   the Free Software Foundation; either version 3 of the License, or
10   (at your option) any later version.
11
12   This program is distributed in the hope that it will be useful,
13   but WITHOUT ANY WARRANTY; without even the implied warranty of
14   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15   GNU General Public License for more details.
16
17   You should have received a copy of the GNU General Public License
18   along with this program.  If not, see <http://www.gnu.org/licenses/>.
19*/
20
21#include "includes.h"
22#include "smbd/process_model.h"
23#include "param/param.h"
24
25static const struct model_ops *process_model_byname(const char *name);
26
27/*
28  setup the events for the chosen process model
29*/
30_PUBLIC_ const struct model_ops *process_model_startup(struct tevent_context *ev, const char *model)
31{
32	const struct model_ops *ops;
33
34	ops = process_model_byname(model);
35	if (!ops) {
36		DEBUG(0,("Unknown process model '%s'\n", model));
37		exit(-1);
38	}
39
40	ops->model_init(ev);
41
42	return ops;
43}
44
45/* the list of currently registered process models */
46static struct process_model {
47	struct model_ops *ops;
48} *models = NULL;
49static int num_models;
50
51/*
52  register a process model.
53
54  The 'name' can be later used by other backends to find the operations
55  structure for this backend.
56*/
57_PUBLIC_ NTSTATUS register_process_model(const void *_ops)
58{
59	const struct model_ops *ops = _ops;
60
61	if (process_model_byname(ops->name) != NULL) {
62		/* its already registered! */
63		DEBUG(0,("PROCESS_MODEL '%s' already registered\n",
64			 ops->name));
65		return NT_STATUS_OBJECT_NAME_COLLISION;
66	}
67
68	models = realloc_p(models, struct process_model, num_models+1);
69	if (!models) {
70		smb_panic("out of memory in register_process_model");
71	}
72
73	models[num_models].ops = smb_xmemdup(ops, sizeof(*ops));
74	models[num_models].ops->name = smb_xstrdup(ops->name);
75
76	num_models++;
77
78	DEBUG(3,("PROCESS_MODEL '%s' registered\n",
79		 ops->name));
80
81	return NT_STATUS_OK;
82}
83
84_PUBLIC_ NTSTATUS process_model_init(struct loadparm_context *lp_ctx)
85{
86	extern NTSTATUS process_model_thread_init(void);
87	extern NTSTATUS process_model_standard_init(void);
88	extern NTSTATUS process_model_prefork_init(void);
89	extern NTSTATUS process_model_single_init(void);
90	init_module_fn static_init[] = { STATIC_process_model_MODULES };
91	init_module_fn *shared_init = load_samba_modules(NULL, lp_ctx, "process_model");
92
93	run_init_functions(static_init);
94	run_init_functions(shared_init);
95
96	talloc_free(shared_init);
97
98	return NT_STATUS_OK;
99}
100
101/*
102  return the operations structure for a named backend of the specified type
103*/
104static const struct model_ops *process_model_byname(const char *name)
105{
106	int i;
107
108	for (i=0;i<num_models;i++) {
109		if (strcmp(models[i].ops->name, name) == 0) {
110			return models[i].ops;
111		}
112	}
113
114	return NULL;
115}
116
117/*
118  return the PROCESS_MODEL module version, and the size of some critical types
119  This can be used by process model modules to either detect compilation errors, or provide
120  multiple implementations for different smbd compilation options in one module
121*/
122const struct process_model_critical_sizes *process_model_version(void)
123{
124	static const struct process_model_critical_sizes critical_sizes = {
125		PROCESS_MODEL_VERSION,
126		sizeof(struct model_ops)
127	};
128
129	return &critical_sizes;
130}
131