Rename struct lib_ring_buffer_ctx to struct lttng_kernel_ring_buffer_ctx
[lttng-modules.git] / src / lttng-context-veuid.c
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b7cdc182 1/* SPDX-License-Identifier: (GPL-2.0-only or LGPL-2.1-only)
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2 *
3 * lttng-context-veuid.c
4 *
5 * LTTng namespaced effective user ID context.
6 *
7 * Copyright (C) 2009-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
8 * 2019 Michael Jeanson <mjeanson@efficios.com>
9 *
10 */
11
12#include <linux/module.h>
13#include <linux/sched.h>
2df37e95 14#include <lttng/events.h>
437d5aa5 15#include <lttng/events-internal.h>
2df37e95 16#include <lttng/tracer.h>
24591303 17#include <ringbuffer/frontend_types.h>
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18#include <wrapper/vmalloc.h>
19#include <wrapper/user_namespace.h>
20
21static
a92e844e 22size_t veuid_get_size(void *priv, struct lttng_kernel_probe_ctx *probe_ctx, size_t offset)
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23{
24 size_t size = 0;
25
26 size += lib_ring_buffer_align(offset, lttng_alignof(uid_t));
27 size += sizeof(uid_t);
28 return size;
29}
30
31static
a92e844e 32void veuid_record(void *priv, struct lttng_kernel_probe_ctx *probe_ctx,
8a57ec02 33 struct lttng_kernel_ring_buffer_ctx *ctx,
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34 struct lttng_channel *chan)
35{
36 uid_t veuid;
37
38 veuid = lttng_current_veuid();
39 lib_ring_buffer_align_ctx(ctx, lttng_alignof(veuid));
40 chan->ops->event_write(ctx, &veuid, sizeof(veuid));
41}
42
43static
2dc781e0 44void veuid_get_value(void *priv,
a92e844e 45 struct lttng_kernel_probe_ctx *lttng_probe_ctx,
2dc781e0 46 struct lttng_ctx_value *value)
dc923e75 47{
2dc781e0 48 value->u.s64 = lttng_current_veuid();
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49}
50
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51static const struct lttng_kernel_ctx_field *ctx_field = lttng_kernel_static_ctx_field(
52 lttng_kernel_static_event_field("veuid",
53 lttng_kernel_static_type_integer_from_type(uid_t, __BYTE_ORDER, 10),
54 false, false, false),
55 veuid_get_size,
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56 veuid_record,
57 veuid_get_value,
58 NULL, NULL);
59
60int lttng_add_veuid_to_ctx(struct lttng_kernel_ctx **ctx)
dc923e75 61{
437d5aa5 62 int ret;
dc923e75 63
437d5aa5 64 if (lttng_kernel_find_context(*ctx, ctx_field->event_field->name))
dc923e75 65 return -EEXIST;
437d5aa5 66 ret = lttng_kernel_context_append(ctx, ctx_field);
263b6c88 67 wrapper_vmalloc_sync_mappings();
437d5aa5 68 return ret;
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69}
70EXPORT_SYMBOL_GPL(lttng_add_veuid_to_ctx);
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