2 * (C) Copyright 2009-2011 -
3 * Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
7 * Dual LGPL v2.1/GPL v2 license.
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"
20 size_t ppid_get_size(size_t offset
)
24 size
+= lib_ring_buffer_align(offset
, ltt_alignof(pid_t
));
25 size
+= sizeof(pid_t
);
30 void ppid_record(struct lttng_ctx_field
*field
,
31 struct lib_ring_buffer_ctx
*ctx
,
32 struct ltt_channel
*chan
)
37 ppid
= task_tgid_nr(current
->real_parent
);
39 lib_ring_buffer_align_ctx(ctx
, ltt_alignof(ppid
));
40 chan
->ops
->event_write(ctx
, &ppid
, sizeof(ppid
));
43 int lttng_add_ppid_to_ctx(struct lttng_ctx
**ctx
)
45 struct lttng_ctx_field
*field
;
47 field
= lttng_append_context(ctx
);
50 if (lttng_find_context(*ctx
, "ppid")) {
51 lttng_remove_context_field(ctx
, field
);
54 field
->event_field
.name
= "ppid";
55 field
->event_field
.type
.atype
= atype_integer
;
56 field
->event_field
.type
.u
.basic
.integer
.size
= sizeof(pid_t
) * CHAR_BIT
;
57 field
->event_field
.type
.u
.basic
.integer
.alignment
= ltt_alignof(pid_t
) * CHAR_BIT
;
58 field
->event_field
.type
.u
.basic
.integer
.signedness
= is_signed_type(pid_t
);
59 field
->event_field
.type
.u
.basic
.integer
.reverse_byte_order
= 0;
60 field
->event_field
.type
.u
.basic
.integer
.base
= 10;
61 field
->event_field
.type
.u
.basic
.integer
.encoding
= lttng_encode_none
;
62 field
->get_size
= ppid_get_size
;
63 field
->record
= ppid_record
;
64 wrapper_vmalloc_sync_all();
67 EXPORT_SYMBOL_GPL(lttng_add_ppid_to_ctx
);
69 MODULE_LICENSE("GPL and additional rights");
70 MODULE_AUTHOR("Mathieu Desnoyers");
71 MODULE_DESCRIPTION("Linux Trace Toolkit PPID Context");
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