Commit | Line | Data |
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ce5aef0b MD |
1 | /* |
2 | * ltt-probes.c | |
3 | * | |
4 | * Copyright 2010 (c) - Mathieu Desnoyers <mathieu.desnoyers@efficios.com> | |
5 | * | |
6 | * Holds LTTng probes registry. | |
7 | * | |
8 | * Dual LGPL v2.1/GPL v2 license. | |
9 | */ | |
10 | ||
8d8a24c8 MD |
11 | #include <string.h> |
12 | #include <errno.h> | |
13 | #include <urcu/list.h> | |
14 | #include <ust/core.h> | |
f4681817 | 15 | #include <ust/lttng-events.h> |
ce5aef0b | 16 | |
8d8a24c8 | 17 | static CDS_LIST_HEAD(probe_list); |
ce5aef0b MD |
18 | static DEFINE_MUTEX(probe_mutex); |
19 | ||
20 | static | |
21 | const struct lttng_event_desc *find_event(const char *name) | |
22 | { | |
23 | struct lttng_probe_desc *probe_desc; | |
24 | int i; | |
25 | ||
8d8a24c8 | 26 | cds_list_for_each_entry(probe_desc, &probe_list, head) { |
ce5aef0b MD |
27 | for (i = 0; i < probe_desc->nr_events; i++) { |
28 | if (!strcmp(probe_desc->event_desc[i].name, name)) | |
29 | return &probe_desc->event_desc[i]; | |
30 | } | |
31 | } | |
32 | return NULL; | |
33 | } | |
34 | ||
35 | int ltt_probe_register(struct lttng_probe_desc *desc) | |
36 | { | |
37 | int ret = 0; | |
38 | int i; | |
39 | ||
8d8a24c8 | 40 | pthread_mutex_lock(&probe_mutex); |
ce5aef0b MD |
41 | /* |
42 | * TODO: This is O(N^2). Turn into a hash table when probe registration | |
43 | * overhead becomes an issue. | |
44 | */ | |
45 | for (i = 0; i < desc->nr_events; i++) { | |
46 | if (find_event(desc->event_desc[i].name)) { | |
47 | ret = -EEXIST; | |
48 | goto end; | |
49 | } | |
50 | } | |
8d8a24c8 | 51 | cds_list_add(&desc->head, &probe_list); |
ce5aef0b | 52 | end: |
8d8a24c8 | 53 | pthread_mutex_unlock(&probe_mutex); |
ce5aef0b MD |
54 | return ret; |
55 | } | |
ce5aef0b MD |
56 | |
57 | void ltt_probe_unregister(struct lttng_probe_desc *desc) | |
58 | { | |
8d8a24c8 MD |
59 | pthread_mutex_lock(&probe_mutex); |
60 | cds_list_del(&desc->head); | |
61 | pthread_mutex_unlock(&probe_mutex); | |
ce5aef0b | 62 | } |
ce5aef0b MD |
63 | |
64 | const struct lttng_event_desc *ltt_event_get(const char *name) | |
65 | { | |
66 | const struct lttng_event_desc *event; | |
ce5aef0b | 67 | |
8d8a24c8 | 68 | pthread_mutex_lock(&probe_mutex); |
ce5aef0b | 69 | event = find_event(name); |
8d8a24c8 | 70 | pthread_mutex_unlock(&probe_mutex); |
ce5aef0b MD |
71 | if (!event) |
72 | return NULL; | |
ce5aef0b MD |
73 | return event; |
74 | } | |
ce5aef0b MD |
75 | |
76 | void ltt_event_put(const struct lttng_event_desc *event) | |
77 | { | |
ce5aef0b | 78 | } |
ce5aef0b | 79 | |
8d8a24c8 | 80 | #if 0 |
ce5aef0b MD |
81 | static |
82 | void *tp_list_start(struct seq_file *m, loff_t *pos) | |
83 | { | |
84 | struct lttng_probe_desc *probe_desc; | |
85 | int iter = 0, i; | |
86 | ||
8d8a24c8 MD |
87 | pthread_mutex_lock(&probe_mutex); |
88 | cds_list_for_each_entry(probe_desc, &probe_list, head) { | |
ce5aef0b MD |
89 | for (i = 0; i < probe_desc->nr_events; i++) { |
90 | if (iter++ >= *pos) | |
91 | return (void *) &probe_desc->event_desc[i]; | |
92 | } | |
93 | } | |
94 | /* End of list */ | |
95 | return NULL; | |
96 | } | |
97 | ||
98 | static | |
99 | void *tp_list_next(struct seq_file *m, void *p, loff_t *ppos) | |
100 | { | |
101 | struct lttng_probe_desc *probe_desc; | |
102 | int iter = 0, i; | |
103 | ||
104 | (*ppos)++; | |
8d8a24c8 | 105 | cds_list_for_each_entry(probe_desc, &probe_list, head) { |
ce5aef0b MD |
106 | for (i = 0; i < probe_desc->nr_events; i++) { |
107 | if (iter++ >= *ppos) | |
108 | return (void *) &probe_desc->event_desc[i]; | |
109 | } | |
110 | } | |
111 | /* End of list */ | |
112 | return NULL; | |
113 | } | |
114 | ||
115 | static | |
116 | void tp_list_stop(struct seq_file *m, void *p) | |
117 | { | |
8d8a24c8 | 118 | pthread_mutex_unlock(&probe_mutex); |
ce5aef0b MD |
119 | } |
120 | ||
121 | static | |
122 | int tp_list_show(struct seq_file *m, void *p) | |
123 | { | |
124 | const struct lttng_event_desc *probe_desc = p; | |
125 | ||
126 | /* | |
127 | * Don't export lttng internal events (metadata). | |
128 | */ | |
129 | if (!strncmp(probe_desc->name, "lttng_", sizeof("lttng_") - 1)) | |
130 | return 0; | |
131 | seq_printf(m, "event { name = %s; };\n", | |
132 | probe_desc->name); | |
133 | return 0; | |
134 | } | |
135 | ||
136 | static | |
137 | const struct seq_operations lttng_tracepoint_list_seq_ops = { | |
138 | .start = tp_list_start, | |
139 | .next = tp_list_next, | |
140 | .stop = tp_list_stop, | |
141 | .show = tp_list_show, | |
142 | }; | |
143 | ||
144 | static | |
145 | int lttng_tracepoint_list_open(struct inode *inode, struct file *file) | |
146 | { | |
147 | return seq_open(file, <tng_tracepoint_list_seq_ops); | |
148 | } | |
149 | ||
150 | const struct file_operations lttng_tracepoint_list_fops = { | |
151 | .open = lttng_tracepoint_list_open, | |
152 | .read = seq_read, | |
153 | .llseek = seq_lseek, | |
154 | .release = seq_release, | |
155 | }; | |
8d8a24c8 | 156 | #endif //0 |