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0475c50c DG |
1 | /* |
2 | * Copyright (C) 2013 - David Goulet <dgoulet@efficios.com> | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify it | |
5 | * under the terms of the GNU General Public License, version 2 only, as | |
6 | * published by the Free Software Foundation. | |
7 | * | |
8 | * This program is distributed in the hope that it will be useful, but WITHOUT | |
9 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
10 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
11 | * more details. | |
12 | * | |
13 | * You should have received a copy of the GNU General Public License along with | |
14 | * this program; if not, write to the Free Software Foundation, Inc., 51 | |
15 | * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. | |
16 | */ | |
17 | ||
18 | #define _GNU_SOURCE | |
19 | #include <assert.h> | |
20 | ||
21 | #include <common/common.h> | |
22 | ||
23 | #include "jul.h" | |
24 | #include "utils.h" | |
25 | ||
26 | /* | |
27 | * URCU intermediate call to complete destroy a JUL event. | |
28 | */ | |
29 | static void destroy_event_jul_rcu(struct rcu_head *head) | |
30 | { | |
31 | struct lttng_ht_node_str *node = | |
32 | caa_container_of(head, struct lttng_ht_node_str, head); | |
33 | struct jul_event *event = | |
34 | caa_container_of(node, struct jul_event, node); | |
35 | ||
36 | free(event); | |
37 | } | |
38 | ||
39 | /* | |
40 | * Initialize an already allocated JUL domain object. | |
41 | * | |
42 | * Return 0 on success or else a negative errno value. | |
43 | */ | |
44 | int jul_init_domain(struct jul_domain *dom) | |
45 | { | |
46 | int ret; | |
47 | ||
48 | assert(dom); | |
49 | ||
50 | dom->events = lttng_ht_new(0, LTTNG_HT_TYPE_STRING); | |
51 | if (!dom->events) { | |
52 | ret = -ENOMEM; | |
53 | goto error; | |
54 | } | |
55 | ||
56 | return 0; | |
57 | ||
58 | error: | |
59 | return ret; | |
60 | } | |
61 | ||
62 | /* | |
63 | * Create a newly allocated JUL event data structure. If name is valid, it's | |
64 | * copied into the created event. | |
65 | * | |
66 | * Return a new object else NULL on error. | |
67 | */ | |
68 | struct jul_event *jul_create_event(const char *name) | |
69 | { | |
70 | struct jul_event *event; | |
71 | ||
72 | DBG3("JUL create new event with name %s", name); | |
73 | ||
74 | event = zmalloc(sizeof(*event)); | |
75 | if (!event) { | |
76 | goto error; | |
77 | } | |
78 | ||
79 | if (name) { | |
80 | strncpy(event->name, name, sizeof(event->name)); | |
81 | event->name[sizeof(event->name) - 1] = '\0'; | |
82 | } | |
83 | ||
84 | error: | |
85 | return event; | |
86 | } | |
87 | ||
88 | /* | |
89 | * Unique add of a JUL event to a given domain. | |
90 | */ | |
91 | void jul_add_event(struct jul_event *event, struct jul_domain *dom) | |
92 | { | |
93 | assert(event); | |
94 | assert(dom); | |
95 | assert(dom->events); | |
96 | ||
97 | DBG3("JUL adding event %s to domain", event->name); | |
98 | ||
99 | lttng_ht_add_unique_str(dom->events, &event->node); | |
100 | } | |
101 | ||
102 | /* | |
103 | * Find a JUL event in the given domain using name. | |
104 | * | |
105 | * RCU read side lock MUST be acquired. | |
106 | * | |
107 | * Return object if found else NULL. | |
108 | */ | |
109 | struct jul_event *jul_find_by_name(const char *name, struct jul_domain *dom) | |
110 | { | |
111 | struct lttng_ht_node_str *node; | |
112 | struct lttng_ht_iter iter; | |
113 | ||
114 | assert(name); | |
115 | assert(dom); | |
116 | assert(dom->events); | |
117 | ||
118 | lttng_ht_lookup(dom->events, (void *)name, &iter); | |
119 | node = lttng_ht_iter_get_node_str(&iter); | |
120 | if (node == NULL) { | |
121 | goto error; | |
122 | } | |
123 | ||
124 | DBG3("JUL found by name %s in domain.", name); | |
125 | return caa_container_of(node, struct jul_event, node); | |
126 | ||
127 | error: | |
128 | DBG3("JUL NOT found by name %s in domain.", name); | |
129 | return NULL; | |
130 | } | |
131 | ||
132 | /* | |
133 | * Delete JUL event from given domain. Events hash table MUST be initialized. | |
134 | */ | |
135 | void jul_delete_event(struct jul_event *event, struct jul_domain *dom) | |
136 | { | |
137 | int ret; | |
138 | struct lttng_ht_iter iter; | |
139 | ||
140 | assert(event); | |
141 | assert(dom); | |
142 | assert(dom->events); | |
143 | ||
144 | DBG3("JUL deleting event %s from domain", event->name); | |
145 | ||
146 | iter.iter.node = &event->node.node; | |
147 | rcu_read_lock(); | |
148 | ret = lttng_ht_del(dom->events, &iter); | |
149 | rcu_read_unlock(); | |
150 | assert(!ret); | |
151 | } | |
152 | ||
153 | /* | |
154 | * Free given JUl event. After this call, the pointer is not usable anymore. | |
155 | */ | |
156 | void jul_destroy_event(struct jul_event *event) | |
157 | { | |
158 | assert(event); | |
159 | ||
160 | free(event); | |
161 | } | |
162 | ||
163 | /* | |
164 | * Destroy a JUL domain completely. Note that the given pointer is NOT freed | |
165 | * thus a reference can be passed to this function. | |
166 | */ | |
167 | void jul_destroy_domain(struct jul_domain *dom) | |
168 | { | |
169 | struct lttng_ht_node_str *node; | |
170 | struct lttng_ht_iter iter; | |
171 | ||
172 | assert(dom); | |
173 | ||
174 | DBG3("JUL destroy domain"); | |
175 | ||
176 | /* | |
177 | * Just ignore if no events hash table exists. This is possible if for | |
178 | * instance a JUL domain object was allocated but not initialized. | |
179 | */ | |
180 | if (!dom->events) { | |
181 | return; | |
182 | } | |
183 | ||
184 | rcu_read_lock(); | |
185 | cds_lfht_for_each_entry(dom->events->ht, &iter.iter, node, node) { | |
186 | int ret; | |
187 | ||
188 | ret = lttng_ht_del(dom->events, &iter); | |
189 | assert(!ret); | |
190 | call_rcu(&node->head, destroy_event_jul_rcu); | |
191 | } | |
192 | rcu_read_unlock(); | |
193 | ||
194 | ht_cleanup_push(dom->events); | |
195 | } |