| 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 | } |