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b64bc438 MD |
1 | /* |
2 | * (C) Copyright 2009-2011 - | |
3 | * Mathieu Desnoyers <mathieu.desnoyers@efficios.com> | |
4 | * | |
5 | * LTTng vPPID context. | |
6 | * | |
7 | * Dual LGPL v2.1/GPL v2 license. | |
8 | */ | |
9 | ||
10 | #include <linux/module.h> | |
11 | #include <linux/slab.h> | |
12 | #include <linux/sched.h> | |
13 | #include <linux/syscalls.h> | |
14 | #include "ltt-events.h" | |
15 | #include "wrapper/ringbuffer/frontend_types.h" | |
16 | #include "wrapper/vmalloc.h" | |
17 | #include "ltt-tracer.h" | |
18 | ||
19 | static | |
20 | size_t vppid_get_size(size_t offset) | |
21 | { | |
22 | size_t size = 0; | |
23 | ||
24 | size += lib_ring_buffer_align(offset, ltt_alignof(pid_t)); | |
25 | size += sizeof(pid_t); | |
26 | return size; | |
27 | } | |
28 | ||
29 | static | |
30 | void vppid_record(struct lttng_ctx_field *field, | |
31 | struct lib_ring_buffer_ctx *ctx, | |
32 | struct ltt_channel *chan) | |
33 | { | |
34 | pid_t vppid; | |
35 | ||
36 | rcu_read_lock(); | |
37 | vppid = task_tgid_vnr(current->real_parent); | |
38 | rcu_read_unlock(); | |
39 | lib_ring_buffer_align_ctx(ctx, ltt_alignof(vppid)); | |
40 | chan->ops->event_write(ctx, &vppid, sizeof(vppid)); | |
41 | } | |
42 | ||
43 | int lttng_add_vppid_to_ctx(struct lttng_ctx **ctx) | |
44 | { | |
45 | struct lttng_ctx_field *field; | |
b64bc438 MD |
46 | |
47 | field = lttng_append_context(ctx); | |
48 | if (!field) | |
09fec6b4 | 49 | return -ENOMEM; |
b64bc438 MD |
50 | field->event_field.name = "vppid"; |
51 | field->event_field.type.atype = atype_integer; | |
52 | field->event_field.type.u.basic.integer.size = sizeof(pid_t) * CHAR_BIT; | |
53 | field->event_field.type.u.basic.integer.alignment = ltt_alignof(pid_t) * CHAR_BIT; | |
54 | field->event_field.type.u.basic.integer.signedness = is_signed_type(pid_t); | |
55 | field->event_field.type.u.basic.integer.reverse_byte_order = 0; | |
56 | field->event_field.type.u.basic.integer.base = 10; | |
57 | field->event_field.type.u.basic.integer.encoding = lttng_encode_none; | |
58 | field->get_size = vppid_get_size; | |
59 | field->record = vppid_record; | |
60 | wrapper_vmalloc_sync_all(); | |
61 | return 0; | |
62 | } | |
63 | EXPORT_SYMBOL_GPL(lttng_add_vppid_to_ctx); | |
64 | ||
65 | MODULE_LICENSE("GPL and additional rights"); | |
66 | MODULE_AUTHOR("Mathieu Desnoyers"); | |
67 | MODULE_DESCRIPTION("Linux Trace Toolkit vPPID Context"); |