1 /* SPDX-License-Identifier: (GPL-2.0-only or LGPL-2.1-only)
7 * Copyright (C) 2009-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
10 #include <linux/module.h>
11 #include <linux/slab.h>
12 #include <linux/sched.h>
13 #include <lttng-events.h>
14 #include <wrapper/ringbuffer/frontend_types.h>
15 #include <lttng-tracer.h>
18 size_t vpid_get_size(size_t offset
)
22 size
+= lib_ring_buffer_align(offset
, lttng_alignof(pid_t
));
23 size
+= sizeof(pid_t
);
28 void vpid_record(struct lttng_ctx_field
*field
,
29 struct lib_ring_buffer_ctx
*ctx
,
30 struct lttng_channel
*chan
)
35 * nsproxy can be NULL when scheduled out of exit.
37 if (!current
->nsproxy
)
40 vpid
= task_tgid_vnr(current
);
41 lib_ring_buffer_align_ctx(ctx
, lttng_alignof(vpid
));
42 chan
->ops
->event_write(ctx
, &vpid
, sizeof(vpid
));
46 void vpid_get_value(struct lttng_ctx_field
*field
,
47 struct lttng_probe_ctx
*lttng_probe_ctx
,
48 union lttng_ctx_value
*value
)
53 * nsproxy can be NULL when scheduled out of exit.
55 if (!current
->nsproxy
)
58 vpid
= task_tgid_vnr(current
);
62 int lttng_add_vpid_to_ctx(struct lttng_ctx
**ctx
)
64 struct lttng_ctx_field
*field
;
66 field
= lttng_append_context(ctx
);
69 if (lttng_find_context(*ctx
, "vpid")) {
70 lttng_remove_context_field(ctx
, field
);
73 field
->event_field
.name
= "vpid";
74 field
->event_field
.type
.atype
= atype_integer
;
75 field
->event_field
.type
.u
.integer
.size
= sizeof(pid_t
) * CHAR_BIT
;
76 field
->event_field
.type
.u
.integer
.alignment
= lttng_alignof(pid_t
) * CHAR_BIT
;
77 field
->event_field
.type
.u
.integer
.signedness
= lttng_is_signed_type(pid_t
);
78 field
->event_field
.type
.u
.integer
.reverse_byte_order
= 0;
79 field
->event_field
.type
.u
.integer
.base
= 10;
80 field
->event_field
.type
.u
.integer
.encoding
= lttng_encode_none
;
81 field
->get_size
= vpid_get_size
;
82 field
->record
= vpid_record
;
83 field
->get_value
= vpid_get_value
;
84 lttng_context_update(*ctx
);
87 EXPORT_SYMBOL_GPL(lttng_add_vpid_to_ctx
);
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