1 /* SPDX-License-Identifier: GPL-2.0 */
3 #define TRACE_SYSTEM signal
5 #if !defined(LTTNG_TRACE_SIGNAL_H) || defined(TRACE_HEADER_MULTI_READ)
6 #define LTTNG_TRACE_SIGNAL_H
8 #include <probes/lttng-tracepoint-event.h>
9 #include <linux/version.h>
11 #ifndef _TRACE_SIGNAL_DEF
12 #define _TRACE_SIGNAL_DEF
13 #include <linux/signal.h>
14 #include <linux/sched.h>
15 #undef LTTNG_FIELDS_SIGINFO
16 #define LTTNG_FIELDS_SIGINFO(info) \
17 ctf_integer(int, errno, \
18 (info == SEND_SIG_NOINFO || info == SEND_SIG_FORCED || info == SEND_SIG_PRIV) ? \
21 ctf_integer(int, code, \
22 (info == SEND_SIG_NOINFO || info == SEND_SIG_FORCED) ? \
24 ((info == SEND_SIG_PRIV) ? SI_KERNEL : info->si_code))
25 #endif /* _TRACE_SIGNAL_DEF */
28 * signal_generate - called when a signal is generated
30 * @info: pointer to struct siginfo
31 * @task: pointer to struct task_struct
33 * Current process sends a 'sig' signal to 'task' process with
34 * 'info' siginfo. If 'info' is SEND_SIG_NOINFO or SEND_SIG_PRIV,
35 * 'info' is not a pointer and you can't access its field. Instead,
36 * SEND_SIG_NOINFO means that si_code is SI_USER, and SEND_SIG_PRIV
37 * means that si_code is SI_KERNEL.
39 #if (LINUX_VERSION_CODE < KERNEL_VERSION(3,4,0))
40 LTTNG_TRACEPOINT_EVENT(signal_generate
,
42 TP_PROTO(int sig
, struct siginfo
*info
, struct task_struct
*task
),
44 TP_ARGS(sig
, info
, task
),
47 ctf_integer(int, sig
, sig
)
48 LTTNG_FIELDS_SIGINFO(info
)
49 ctf_array_text(char, comm
, task
->comm
, TASK_COMM_LEN
)
50 ctf_integer(pid_t
, pid
, task
->pid
)
54 LTTNG_TRACEPOINT_EVENT(signal_generate
,
56 TP_PROTO(int sig
, struct siginfo
*info
, struct task_struct
*task
,
57 int group
, int result
),
59 TP_ARGS(sig
, info
, task
, group
, result
),
62 ctf_integer(int, sig
, sig
)
63 LTTNG_FIELDS_SIGINFO(info
)
64 ctf_array_text(char, comm
, task
->comm
, TASK_COMM_LEN
)
65 ctf_integer(pid_t
, pid
, task
->pid
)
66 ctf_integer(int, group
, group
)
67 ctf_integer(int, result
, result
)
73 * signal_deliver - called when a signal is delivered
75 * @info: pointer to struct siginfo
76 * @ka: pointer to struct k_sigaction
78 * A 'sig' signal is delivered to current process with 'info' siginfo,
79 * and it will be handled by 'ka'. ka->sa.sa_handler can be SIG_IGN or
81 * Note that some signals reported by signal_generate tracepoint can be
82 * lost, ignored or modified (by debugger) before hitting this tracepoint.
83 * This means, this can show which signals are actually delivered, but
84 * matching generated signals and delivered signals may not be correct.
86 LTTNG_TRACEPOINT_EVENT(signal_deliver
,
88 TP_PROTO(int sig
, struct siginfo
*info
, struct k_sigaction
*ka
),
90 TP_ARGS(sig
, info
, ka
),
93 ctf_integer(int, sig
, sig
)
94 LTTNG_FIELDS_SIGINFO(info
)
95 ctf_integer(unsigned long, sa_handler
, (unsigned long) ka
->sa
.sa_handler
)
96 ctf_integer(unsigned long, sa_flags
, ka
->sa
.sa_flags
)
100 #if (LINUX_VERSION_CODE < KERNEL_VERSION(3,4,0))
101 LTTNG_TRACEPOINT_EVENT_CLASS(signal_queue_overflow
,
103 TP_PROTO(int sig
, int group
, struct siginfo
*info
),
105 TP_ARGS(sig
, group
, info
),
108 ctf_integer(int, sig
, sig
)
109 ctf_integer(int, group
, group
)
110 LTTNG_FIELDS_SIGINFO(info
)
115 * signal_overflow_fail - called when signal queue is overflow
116 * @sig: signal number
117 * @group: signal to process group or not (bool)
118 * @info: pointer to struct siginfo
120 * Kernel fails to generate 'sig' signal with 'info' siginfo, because
121 * siginfo queue is overflow, and the signal is dropped.
122 * 'group' is not 0 if the signal will be sent to a process group.
123 * 'sig' is always one of RT signals.
125 LTTNG_TRACEPOINT_EVENT_INSTANCE(signal_queue_overflow
, signal_overflow_fail
,
127 TP_PROTO(int sig
, int group
, struct siginfo
*info
),
129 TP_ARGS(sig
, group
, info
)
133 * signal_lose_info - called when siginfo is lost
134 * @sig: signal number
135 * @group: signal to process group or not (bool)
136 * @info: pointer to struct siginfo
138 * Kernel generates 'sig' signal but loses 'info' siginfo, because siginfo
140 * 'group' is not 0 if the signal will be sent to a process group.
141 * 'sig' is always one of non-RT signals.
143 LTTNG_TRACEPOINT_EVENT_INSTANCE(signal_queue_overflow
, signal_lose_info
,
145 TP_PROTO(int sig
, int group
, struct siginfo
*info
),
147 TP_ARGS(sig
, group
, info
)
151 #endif /* LTTNG_TRACE_SIGNAL_H */
153 /* This part must be outside protection */
154 #include <probes/define_trace.h>
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