Clean-up: sessiond: move registry_session free functions under class
[lttng-tools.git] / src / bin / lttng-sessiond / ust-registry.cpp
1 /*
2 * Copyright (C) 2013 David Goulet <dgoulet@efficios.com>
3 *
4 * SPDX-License-Identifier: GPL-2.0-only
5 *
6 */
7
8 #define _LGPL_SOURCE
9
10 #include "ust-registry.hpp"
11 #include "lttng-sessiond.hpp"
12 #include "notification-thread-commands.hpp"
13 #include "ust-app.hpp"
14 #include "ust-registry-session-pid.hpp"
15 #include "ust-registry-session-uid.hpp"
16 #include "utils.hpp"
17
18 #include <common/common.hpp>
19 #include <common/exception.hpp>
20 #include <common/format.hpp>
21 #include <common/hashtable/utils.hpp>
22 #include <common/make-unique-wrapper.hpp>
23 #include <lttng/lttng.h>
24
25 #include <inttypes.h>
26
27 namespace ls = lttng::sessiond;
28 namespace lst = lttng::sessiond::trace;
29 namespace lsu = lttng::sessiond::ust;
30
31 /*
32 * Destroy event function call of the call RCU.
33 */
34 static void ust_registry_event_destroy_rcu(struct rcu_head *head)
35 {
36 struct lttng_ht_node_u64 *node = caa_container_of(head, struct lttng_ht_node_u64, head);
37 DIAGNOSTIC_PUSH
38 DIAGNOSTIC_IGNORE_INVALID_OFFSETOF
39 lttng::sessiond::ust::registry_event *event =
40 caa_container_of(node, lttng::sessiond::ust::registry_event, _node);
41 DIAGNOSTIC_POP
42
43 lttng::sessiond::ust::registry_event_destroy(event);
44 }
45
46 /*
47 * For a given event in a registry, delete the entry and destroy the event.
48 * This MUST be called within a RCU read side lock section.
49 */
50 void ust_registry_channel_destroy_event(lsu::registry_channel *chan,
51 lttng::sessiond::ust::registry_event *event)
52 {
53 int ret;
54 struct lttng_ht_iter iter;
55
56 LTTNG_ASSERT(chan);
57 LTTNG_ASSERT(event);
58 ASSERT_RCU_READ_LOCKED();
59
60 /* Delete the node first. */
61 iter.iter.node = &event->_node.node;
62 ret = lttng_ht_del(chan->_events, &iter);
63 LTTNG_ASSERT(!ret);
64
65 call_rcu(&event->_node.head, ust_registry_event_destroy_rcu);
66
67 return;
68 }
69
70 lsu::registry_session *ust_registry_session_per_uid_create(const lttng::sessiond::trace::abi& abi,
71 uint32_t major,
72 uint32_t minor,
73 const char *root_shm_path,
74 const char *shm_path,
75 uid_t euid,
76 gid_t egid,
77 uint64_t tracing_id,
78 uid_t tracing_uid)
79 {
80 try {
81 return new lsu::registry_session_per_uid(abi, major, minor, root_shm_path, shm_path,
82 euid, egid, tracing_id, tracing_uid);
83 } catch (const std::exception& ex) {
84 ERR("Failed to create per-uid registry session: %s", ex.what());
85 return nullptr;
86 }
87 }
88
89 lsu::registry_session *ust_registry_session_per_pid_create(struct ust_app *app,
90 const lttng::sessiond::trace::abi& abi,
91 uint32_t major,
92 uint32_t minor,
93 const char *root_shm_path,
94 const char *shm_path,
95 uid_t euid,
96 gid_t egid,
97 uint64_t tracing_id)
98 {
99 try {
100 return new lsu::registry_session_per_pid(*app, abi, major, minor, root_shm_path,
101 shm_path, euid, egid, tracing_id);
102 } catch (const std::exception& ex) {
103 ERR("Failed to create per-pid registry session: %s", ex.what());
104 return nullptr;
105 }
106 }
107
108 /*
109 * Destroy session registry. This does NOT free the given pointer since it
110 * might get passed as a reference. The registry lock should NOT be acquired.
111 */
112 void ust_registry_session_destroy(lsu::registry_session *reg)
113 {
114 delete reg;
115 }
116
117 lsu::registry_enum::registry_enum(
118 std::string in_name, enum lst::integer_type::signedness in_signedness) :
119 name{std::move(in_name)}, signedness{in_signedness}
120 {
121 cds_lfht_node_init(&this->node.node);
122 this->rcu_head = {};
123 }
124
125 bool lsu::operator==(const lsu::registry_enum& lhs, const lsu::registry_enum& rhs) noexcept
126 {
127 if (lhs.signedness != rhs.signedness) {
128 return false;
129 }
130
131 return lhs._is_equal(rhs);
132 }
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