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5e96a467 MD |
1 | /* |
2 | * ust-core.c | |
3 | * | |
4 | * Copyright (C) 2011 Mathieu Desnoyers <mathieu.desnoyers@efficios.com> | |
5 | * | |
6 | * This library is free software; you can redistribute it and/or | |
7 | * modify it under the terms of the GNU Lesser General Public | |
8 | * License as published by the Free Software Foundation; only | |
9 | * version 2.1 of the License. | |
10 | * | |
11 | * This library is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
14 | * Lesser General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU Lesser General Public | |
17 | * License along with this library; if not, write to the Free Software | |
18 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | |
19 | */ | |
20 | ||
5e96a467 | 21 | #include <stdlib.h> |
44c72f10 MD |
22 | #include <lttng/ust-events.h> |
23 | #include <usterr-signal-safe.h> | |
c785c634 | 24 | #include "jhash.h" |
5e96a467 | 25 | |
7dd08bec | 26 | static CDS_LIST_HEAD(lttng_transport_list); |
c1fca457 | 27 | |
7dd08bec | 28 | struct lttng_transport *lttng_transport_find(const char *name) |
c1fca457 | 29 | { |
7dd08bec | 30 | struct lttng_transport *transport; |
c1fca457 | 31 | |
7dd08bec | 32 | cds_list_for_each_entry(transport, <tng_transport_list, node) { |
c1fca457 MD |
33 | if (!strcmp(transport->name, name)) |
34 | return transport; | |
35 | } | |
36 | return NULL; | |
37 | } | |
38 | ||
39 | /** | |
7dd08bec | 40 | * lttng_transport_register - LTT transport registration |
c1fca457 MD |
41 | * @transport: transport structure |
42 | * | |
43 | * Registers a transport which can be used as output to extract the data out of | |
44 | * LTTng. Called with ust_lock held. | |
45 | */ | |
7dd08bec | 46 | void lttng_transport_register(struct lttng_transport *transport) |
c1fca457 | 47 | { |
7dd08bec | 48 | cds_list_add_tail(&transport->node, <tng_transport_list); |
c1fca457 MD |
49 | } |
50 | ||
51 | /** | |
7dd08bec | 52 | * lttng_transport_unregister - LTT transport unregistration |
c1fca457 MD |
53 | * @transport: transport structure |
54 | * Called with ust_lock held. | |
55 | */ | |
7dd08bec | 56 | void lttng_transport_unregister(struct lttng_transport *transport) |
c1fca457 MD |
57 | { |
58 | cds_list_del(&transport->node); | |
59 | } | |
c785c634 MD |
60 | |
61 | /* | |
62 | * Needed by comm layer. | |
63 | */ | |
64 | struct lttng_enum *lttng_ust_enum_get(struct lttng_session *session, | |
65 | const char *enum_name) | |
66 | { | |
67 | struct lttng_enum *_enum; | |
68 | struct cds_hlist_head *head; | |
69 | struct cds_hlist_node *node; | |
70 | size_t name_len = strlen(enum_name); | |
71 | uint32_t hash; | |
72 | ||
73 | hash = jhash(enum_name, name_len, 0); | |
74 | head = &session->enums_ht.table[hash & (LTTNG_UST_ENUM_HT_SIZE - 1)]; | |
75 | cds_hlist_for_each_entry(_enum, node, head, hlist) { | |
76 | assert(_enum->desc); | |
77 | if (!strncmp(_enum->desc->name, enum_name, | |
78 | LTTNG_UST_SYM_NAME_LEN - 1)) | |
79 | return _enum; | |
80 | } | |
81 | return NULL; | |
82 | } |