1 /* SPDX-License-Identifier: (GPL-2.0-only or LGPL-2.1-only)
3 * lttng-context-pid-ns.c
5 * LTTng pid namespace context.
7 * Copyright (C) 2009-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
8 * 2019 Michael Jeanson <mjeanson@efficios.com>
12 #include <linux/module.h>
13 #include <linux/slab.h>
14 #include <linux/sched.h>
15 #include <linux/pid_namespace.h>
16 #include <lttng/lttng-events.h>
17 #include <ringbuffer/frontend_types.h>
18 #include <lttng/lttng-tracer.h>
20 #if defined(CONFIG_PID_NS)
23 size_t pid_ns_get_size(size_t offset
)
27 size
+= lib_ring_buffer_align(offset
, lttng_alignof(unsigned int));
28 size
+= sizeof(unsigned int);
33 void pid_ns_record(struct lttng_ctx_field
*field
,
34 struct lib_ring_buffer_ctx
*ctx
,
35 struct lttng_channel
*chan
)
37 struct pid_namespace
*ns
;
38 unsigned int pid_ns_inum
= 0;
41 * The pid namespace is an exception -- it's accessed using
42 * task_active_pid_ns. The pid namespace in nsproxy is the
43 * namespace that children will use.
45 ns
= task_active_pid_ns(current
);
48 pid_ns_inum
= ns
->ns
.inum
;
50 lib_ring_buffer_align_ctx(ctx
, lttng_alignof(pid_ns_inum
));
51 chan
->ops
->event_write(ctx
, &pid_ns_inum
, sizeof(pid_ns_inum
));
55 void pid_ns_get_value(struct lttng_ctx_field
*field
,
56 struct lttng_probe_ctx
*lttng_probe_ctx
,
57 union lttng_ctx_value
*value
)
59 struct pid_namespace
*ns
;
60 unsigned int pid_ns_inum
= 0;
63 * The pid namespace is an exception -- it's accessed using
64 * task_active_pid_ns. The pid namespace in nsproxy is the
65 * namespace that children will use.
67 ns
= task_active_pid_ns(current
);
70 pid_ns_inum
= ns
->ns
.inum
;
72 value
->s64
= pid_ns_inum
;
75 int lttng_add_pid_ns_to_ctx(struct lttng_ctx
**ctx
)
77 struct lttng_ctx_field
*field
;
79 field
= lttng_append_context(ctx
);
82 if (lttng_find_context(*ctx
, "pid_ns")) {
83 lttng_remove_context_field(ctx
, field
);
86 field
->event_field
.name
= "pid_ns";
87 field
->event_field
.type
.atype
= atype_integer
;
88 field
->event_field
.type
.u
.integer
.size
= sizeof(unsigned int) * CHAR_BIT
;
89 field
->event_field
.type
.u
.integer
.alignment
= lttng_alignof(unsigned int) * CHAR_BIT
;
90 field
->event_field
.type
.u
.integer
.signedness
= lttng_is_signed_type(unsigned int);
91 field
->event_field
.type
.u
.integer
.reverse_byte_order
= 0;
92 field
->event_field
.type
.u
.integer
.base
= 10;
93 field
->event_field
.type
.u
.integer
.encoding
= lttng_encode_none
;
94 field
->get_size
= pid_ns_get_size
;
95 field
->record
= pid_ns_record
;
96 field
->get_value
= pid_ns_get_value
;
97 lttng_context_update(*ctx
);
100 EXPORT_SYMBOL_GPL(lttng_add_pid_ns_to_ctx
);
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