1 /* SPDX-License-Identifier: (GPL-2.0 or LGPL-2.1)
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-events.h>
17 #include <wrapper/ringbuffer/frontend_types.h>
18 #include <wrapper/vmalloc.h>
19 #include <wrapper/namespace.h>
20 #include <lttng-tracer.h>
22 #if defined(CONFIG_PID_NS) && \
23 (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,8,0))
26 size_t pid_ns_get_size(size_t offset
)
30 size
+= lib_ring_buffer_align(offset
, lttng_alignof(unsigned int));
31 size
+= sizeof(unsigned int);
36 void pid_ns_record(struct lttng_ctx_field
*field
,
37 struct lib_ring_buffer_ctx
*ctx
,
38 struct lttng_channel
*chan
)
40 struct pid_namespace
*ns
;
41 unsigned int pid_ns_inum
= 0;
44 * The pid namespace is an exception -- it's accessed using
45 * task_active_pid_ns. The pid namespace in nsproxy is the
46 * namespace that children will use.
48 ns
= task_active_pid_ns(current
);
51 pid_ns_inum
= ns
->lttng_ns_inum
;
53 lib_ring_buffer_align_ctx(ctx
, lttng_alignof(pid_ns_inum
));
54 chan
->ops
->event_write(ctx
, &pid_ns_inum
, sizeof(pid_ns_inum
));
58 void pid_ns_get_value(struct lttng_ctx_field
*field
,
59 struct lttng_probe_ctx
*lttng_probe_ctx
,
60 union lttng_ctx_value
*value
)
62 struct pid_namespace
*ns
;
63 unsigned int pid_ns_inum
= 0;
66 * The pid namespace is an exception -- it's accessed using
67 * task_active_pid_ns. The pid namespace in nsproxy is the
68 * namespace that children will use.
70 ns
= task_active_pid_ns(current
);
73 pid_ns_inum
= ns
->lttng_ns_inum
;
75 value
->s64
= pid_ns_inum
;
78 int lttng_add_pid_ns_to_ctx(struct lttng_ctx
**ctx
)
80 struct lttng_ctx_field
*field
;
82 field
= lttng_append_context(ctx
);
85 if (lttng_find_context(*ctx
, "pid_ns")) {
86 lttng_remove_context_field(ctx
, field
);
89 field
->event_field
.name
= "pid_ns";
90 field
->event_field
.type
.atype
= atype_integer
;
91 field
->event_field
.type
.u
.basic
.integer
.size
= sizeof(unsigned int) * CHAR_BIT
;
92 field
->event_field
.type
.u
.basic
.integer
.alignment
= lttng_alignof(unsigned int) * CHAR_BIT
;
93 field
->event_field
.type
.u
.basic
.integer
.signedness
= lttng_is_signed_type(unsigned int);
94 field
->event_field
.type
.u
.basic
.integer
.reverse_byte_order
= 0;
95 field
->event_field
.type
.u
.basic
.integer
.base
= 10;
96 field
->event_field
.type
.u
.basic
.integer
.encoding
= lttng_encode_none
;
97 field
->get_size
= pid_ns_get_size
;
98 field
->record
= pid_ns_record
;
99 field
->get_value
= pid_ns_get_value
;
100 lttng_context_update(*ctx
);
101 wrapper_vmalloc_sync_mappings();
104 EXPORT_SYMBOL_GPL(lttng_add_pid_ns_to_ctx
);
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