1: /*
2: * module.c Module API
3: *
4: * Copyright (c) 2001-2013 Thomas Graf <tgraf@suug.ch>
5: * Copyright (c) 2013 Red Hat, Inc.
6: *
7: * Permission is hereby granted, free of charge, to any person obtaining a
8: * copy of this software and associated documentation files (the "Software"),
9: * to deal in the Software without restriction, including without limitation
10: * the rights to use, copy, modify, merge, publish, distribute, sublicense,
11: * and/or sell copies of the Software, and to permit persons to whom the
12: * Software is furnished to do so, subject to the following conditions:
13: *
14: * The above copyright notice and this permission notice shall be included
15: * in all copies or substantial portions of the Software.
16: *
17: * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
18: * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
19: * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
20: * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
21: * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
22: * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
23: * DEALINGS IN THE SOFTWARE.
24: */
25:
26: #include <bmon/bmon.h>
27: #include <bmon/module.h>
28: #include <bmon/utils.h>
29:
30: static LIST_HEAD(subsys_list);
31:
32: static void module_foreach(struct bmon_subsys *ss, void (*cb)(struct bmon_module *))
33: {
34: struct bmon_module *m;
35:
36: list_for_each_entry(m, &ss->s_mod_list, m_list)
37: cb(m);
38: }
39:
40: void module_foreach_run_enabled_pre(struct bmon_subsys *ss)
41: {
42: struct bmon_module *m;
43:
44: list_for_each_entry(m, &ss->s_mod_list, m_list)
45: if (m->m_flags & BMON_MODULE_ENABLED && m->m_pre)
46: m->m_pre();
47: }
48:
49: void module_foreach_run_enabled(struct bmon_subsys *ss)
50: {
51: struct bmon_module *m;
52:
53: list_for_each_entry(m, &ss->s_mod_list, m_list)
54: if (m->m_flags & BMON_MODULE_ENABLED && m->m_do)
55: m->m_do();
56: }
57:
58: void module_foreach_run_enabled_post(struct bmon_subsys *ss)
59: {
60: struct bmon_module *m;
61:
62: list_for_each_entry(m, &ss->s_mod_list, m_list)
63: if (m->m_flags & BMON_MODULE_ENABLED && m->m_post)
64: m->m_post();
65: }
66:
67: static struct bmon_module *module_lookup(struct bmon_subsys *ss, const char *name)
68: {
69: struct bmon_module *m;
70:
71: list_for_each_entry(m, &ss->s_mod_list, m_list)
72: if (!strcmp(m->m_name, name))
73: return m;
74:
75: return NULL;
76: }
77:
78: static void module_list(struct bmon_subsys *ss, struct list_head *list)
79: {
80: printf("%s modules:\n", ss->s_name);
81: if (list_empty(list))
82: printf("\tNo %s modules found.\n", ss->s_name);
83: else {
84: struct bmon_module *m;
85:
86: list_for_each_entry(m, list, m_list)
87: printf("\t%s\n", m->m_name);
88: }
89: }
90:
91: static int module_configure(struct bmon_module *m, module_conf_t *cfg)
92: {
93: DBG("Configuring module %s", m->m_name);
94:
95: if (m->m_parse_opt && cfg) {
96: tv_t *tv;
97:
98: list_for_each_entry(tv, &cfg->m_attrs, tv_list)
99: m->m_parse_opt(tv->tv_type, tv->tv_value);
100: }
101:
102: if (m->m_probe && !m->m_probe())
103: return -EINVAL;
104:
105: m->m_flags |= BMON_MODULE_ENABLED;
106: m->m_subsys->s_nmod++;
107:
108: return 0;
109: }
110:
111: int module_register(struct bmon_subsys *ss, struct bmon_module *m)
112: {
113: if (m->m_subsys)
114: return -EBUSY;
115:
116: list_add_tail(&m->m_list, &ss->s_mod_list);
117: m->m_subsys = ss;
118: return 0;
119: }
120:
121: static void __auto_load(struct bmon_module *m)
122: {
123: if ((m->m_flags & BMON_MODULE_AUTO) &&
124: !(m->m_flags & BMON_MODULE_ENABLED)) {
125: if (module_configure(m, NULL) == 0)
126: DBG("Auto-enabled module %s", m->m_name);
127: }
128: }
129:
130: int module_set(struct bmon_subsys *ss, const char *name)
131: {
132: struct bmon_module *mod;
133: struct list_head *list;
134: LIST_HEAD(tmp_list);
135: module_conf_t *m;
136:
137: if (!name || !strcasecmp(name, "list")) {
138: module_list(ss, &ss->s_mod_list);
139: return 1;
140: }
141:
142: parse_module_param(name, &tmp_list);
143:
144: list_for_each_entry(m, &tmp_list, m_list) {
145: if (!(mod = module_lookup(ss, m->m_name)))
146: quit("Unknown %s module: %s\n", ss->s_name, m->m_name);
147:
148: if (module_configure(mod, m) == 0)
149: DBG("Enabled module %s", mod->m_name);
150: }
151:
152: module_foreach(ss, __auto_load);
153:
154: if (!ss->s_nmod)
155: quit("No working %s module found\n", ss->s_name);
156:
157: DBG("Configured modules");
158:
159: return 0;
160: }
161:
162: static void __module_init(struct bmon_module *m)
163: {
164: if (m->m_init) {
165: DBG("Initializing %s...", m->m_name);
166: if (m->m_init())
167: m->m_flags &= ~BMON_MODULE_ENABLED;
168: }
169: }
170:
171: void module_init(void)
172: {
173: struct bmon_subsys *ss;
174:
175: DBG("Initializing modules");
176:
177: list_for_each_entry(ss, &subsys_list, s_list) {
178: if (ss->s_activate_default)
179: ss->s_activate_default();
180:
181: module_foreach(ss, __module_init);
182: }
183: }
184:
185: static void __module_shutdown(struct bmon_module *m)
186: {
187: if (m->m_shutdown) {
188: DBG("Shutting down %s...", m->m_name);
189: m->m_shutdown();
190: m->m_flags &= ~BMON_MODULE_ENABLED;
191: }
192: }
193:
194: void module_shutdown(void)
195: {
196: DBG("Shutting down modules");
197:
198: struct bmon_subsys *ss;
199:
200: list_for_each_entry(ss, &subsys_list, s_list)
201: module_foreach(ss, __module_shutdown);
202: }
203:
204: void module_register_subsys(struct bmon_subsys *ss)
205: {
206: DBG("Module %s registered", ss->s_name);
207:
208: list_add_tail(&ss->s_list, &subsys_list);
209: }
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