Commit | Line | Data |
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b7cdc182 | 1 | /* SPDX-License-Identifier: (GPL-2.0-only or LGPL-2.1-only) |
9f36eaed | 2 | * |
886d51a3 | 3 | * lttng-context-tid.c |
b64bc438 MD |
4 | * |
5 | * LTTng TID context. | |
6 | * | |
886d51a3 | 7 | * Copyright (C) 2009-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com> |
b64bc438 MD |
8 | */ |
9 | ||
10 | #include <linux/module.h> | |
11 | #include <linux/slab.h> | |
12 | #include <linux/sched.h> | |
241ae9a8 MD |
13 | #include <lttng-events.h> |
14 | #include <wrapper/ringbuffer/frontend_types.h> | |
241ae9a8 | 15 | #include <lttng-tracer.h> |
b64bc438 MD |
16 | |
17 | static | |
18 | size_t tid_get_size(size_t offset) | |
19 | { | |
20 | size_t size = 0; | |
21 | ||
a90917c3 | 22 | size += lib_ring_buffer_align(offset, lttng_alignof(pid_t)); |
b64bc438 MD |
23 | size += sizeof(pid_t); |
24 | return size; | |
25 | } | |
26 | ||
27 | static | |
28 | void tid_record(struct lttng_ctx_field *field, | |
29 | struct lib_ring_buffer_ctx *ctx, | |
a90917c3 | 30 | struct lttng_channel *chan) |
b64bc438 MD |
31 | { |
32 | pid_t tid; | |
33 | ||
34 | tid = task_pid_nr(current); | |
a90917c3 | 35 | lib_ring_buffer_align_ctx(ctx, lttng_alignof(tid)); |
b64bc438 MD |
36 | chan->ops->event_write(ctx, &tid, sizeof(tid)); |
37 | } | |
38 | ||
f127e61e MD |
39 | static |
40 | void tid_get_value(struct lttng_ctx_field *field, | |
79150a49 | 41 | struct lttng_probe_ctx *lttng_probe_ctx, |
f127e61e MD |
42 | union lttng_ctx_value *value) |
43 | { | |
44 | pid_t tid; | |
45 | ||
46 | tid = task_pid_nr(current); | |
47 | value->s64 = tid; | |
48 | } | |
49 | ||
b64bc438 MD |
50 | int lttng_add_tid_to_ctx(struct lttng_ctx **ctx) |
51 | { | |
52 | struct lttng_ctx_field *field; | |
b64bc438 MD |
53 | |
54 | field = lttng_append_context(ctx); | |
55 | if (!field) | |
09fec6b4 | 56 | return -ENOMEM; |
44252f0f MD |
57 | if (lttng_find_context(*ctx, "tid")) { |
58 | lttng_remove_context_field(ctx, field); | |
59 | return -EEXIST; | |
60 | } | |
b64bc438 MD |
61 | field->event_field.name = "tid"; |
62 | field->event_field.type.atype = atype_integer; | |
ceabb767 MD |
63 | field->event_field.type.u.integer.size = sizeof(pid_t) * CHAR_BIT; |
64 | field->event_field.type.u.integer.alignment = lttng_alignof(pid_t) * CHAR_BIT; | |
65 | field->event_field.type.u.integer.signedness = lttng_is_signed_type(pid_t); | |
66 | field->event_field.type.u.integer.reverse_byte_order = 0; | |
67 | field->event_field.type.u.integer.base = 10; | |
68 | field->event_field.type.u.integer.encoding = lttng_encode_none; | |
b64bc438 MD |
69 | field->get_size = tid_get_size; |
70 | field->record = tid_record; | |
f127e61e | 71 | field->get_value = tid_get_value; |
a9dd15da | 72 | lttng_context_update(*ctx); |
b64bc438 MD |
73 | return 0; |
74 | } | |
75 | EXPORT_SYMBOL_GPL(lttng_add_tid_to_ctx); |