6 * Copyright (C) 2009-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
8 * This library is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Lesser General Public
10 * License as published by the Free Software Foundation; only
11 * version 2.1 of the License.
13 * This library is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * Lesser General Public License for more details.
18 * You should have received a copy of the GNU Lesser General Public
19 * License along with this library; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
23 #include <linux/module.h>
24 #include <linux/slab.h>
25 #include <linux/sched.h>
26 #include <lttng-events.h>
27 #include <wrapper/ringbuffer/frontend_types.h>
28 #include <wrapper/vmalloc.h>
29 #include <lttng-tracer.h>
32 size_t pid_get_size(size_t offset
)
36 size
+= lib_ring_buffer_align(offset
, lttng_alignof(pid_t
));
37 size
+= sizeof(pid_t
);
42 void pid_record(struct lttng_ctx_field
*field
,
43 struct lib_ring_buffer_ctx
*ctx
,
44 struct lttng_channel
*chan
)
48 pid
= task_tgid_nr(current
);
49 lib_ring_buffer_align_ctx(ctx
, lttng_alignof(pid
));
50 chan
->ops
->event_write(ctx
, &pid
, sizeof(pid
));
54 void pid_get_value(struct lttng_ctx_field
*field
,
55 struct lttng_probe_ctx
*lttng_probe_ctx
,
56 union lttng_ctx_value
*value
)
58 value
->s64
= task_tgid_nr(current
);
61 int lttng_add_pid_to_ctx(struct lttng_ctx
**ctx
)
63 struct lttng_ctx_field
*field
;
65 field
= lttng_append_context(ctx
);
68 if (lttng_find_context(*ctx
, "pid")) {
69 lttng_remove_context_field(ctx
, field
);
72 field
->event_field
.name
= "pid";
73 field
->event_field
.type
.atype
= atype_integer
;
74 field
->event_field
.type
.u
.basic
.integer
.size
= sizeof(pid_t
) * CHAR_BIT
;
75 field
->event_field
.type
.u
.basic
.integer
.alignment
= lttng_alignof(pid_t
) * CHAR_BIT
;
76 field
->event_field
.type
.u
.basic
.integer
.signedness
= lttng_is_signed_type(pid_t
);
77 field
->event_field
.type
.u
.basic
.integer
.reverse_byte_order
= 0;
78 field
->event_field
.type
.u
.basic
.integer
.base
= 10;
79 field
->event_field
.type
.u
.basic
.integer
.encoding
= lttng_encode_none
;
80 field
->get_size
= pid_get_size
;
81 field
->record
= pid_record
;
82 field
->get_value
= pid_get_value
;
83 lttng_context_update(*ctx
);
84 wrapper_vmalloc_sync_all();
87 EXPORT_SYMBOL_GPL(lttng_add_pid_to_ctx
);
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