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(4,20,0))
40 LTTNG_TRACEPOINT_EVENT(signal_generate
,
42 TP_PROTO(int sig
, struct kernel_siginfo
*info
, struct task_struct
*task
,
43 int group
, int result
),
45 TP_ARGS(sig
, info
, task
, group
, result
),
48 ctf_integer(int, sig
, sig
)
49 LTTNG_FIELDS_SIGINFO(info
)
50 ctf_array_text(char, comm
, task
->comm
, TASK_COMM_LEN
)
51 ctf_integer(pid_t
, pid
, task
->pid
)
52 ctf_integer(int, group
, group
)
53 ctf_integer(int, result
, result
)
56 #elif (LINUX_VERSION_CODE >= KERNEL_VERSION(3,4,0))
57 LTTNG_TRACEPOINT_EVENT(signal_generate
,
59 TP_PROTO(int sig
, struct siginfo
*info
, struct task_struct
*task
,
60 int group
, int result
),
62 TP_ARGS(sig
, info
, task
, group
, result
),
65 ctf_integer(int, sig
, sig
)
66 LTTNG_FIELDS_SIGINFO(info
)
67 ctf_array_text(char, comm
, task
->comm
, TASK_COMM_LEN
)
68 ctf_integer(pid_t
, pid
, task
->pid
)
69 ctf_integer(int, group
, group
)
70 ctf_integer(int, result
, result
)
74 LTTNG_TRACEPOINT_EVENT(signal_generate
,
76 TP_PROTO(int sig
, struct siginfo
*info
, struct task_struct
*task
),
78 TP_ARGS(sig
, info
, task
),
81 ctf_integer(int, sig
, sig
)
82 LTTNG_FIELDS_SIGINFO(info
)
83 ctf_array_text(char, comm
, task
->comm
, TASK_COMM_LEN
)
84 ctf_integer(pid_t
, pid
, task
->pid
)
90 * signal_deliver - called when a signal is delivered
92 * @info: pointer to struct siginfo
93 * @ka: pointer to struct k_sigaction
95 * A 'sig' signal is delivered to current process with 'info' siginfo,
96 * and it will be handled by 'ka'. ka->sa.sa_handler can be SIG_IGN or
98 * Note that some signals reported by signal_generate tracepoint can be
99 * lost, ignored or modified (by debugger) before hitting this tracepoint.
100 * This means, this can show which signals are actually delivered, but
101 * matching generated signals and delivered signals may not be correct.
103 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,20,0))
104 LTTNG_TRACEPOINT_EVENT(signal_deliver
,
106 TP_PROTO(int sig
, struct kernel_siginfo
*info
, struct k_sigaction
*ka
),
108 TP_ARGS(sig
, info
, ka
),
111 ctf_integer(int, sig
, sig
)
112 LTTNG_FIELDS_SIGINFO(info
)
113 ctf_integer(unsigned long, sa_handler
, (unsigned long) ka
->sa
.sa_handler
)
114 ctf_integer(unsigned long, sa_flags
, ka
->sa
.sa_flags
)
118 LTTNG_TRACEPOINT_EVENT(signal_deliver
,
120 TP_PROTO(int sig
, struct siginfo
*info
, struct k_sigaction
*ka
),
122 TP_ARGS(sig
, info
, ka
),
125 ctf_integer(int, sig
, sig
)
126 LTTNG_FIELDS_SIGINFO(info
)
127 ctf_integer(unsigned long, sa_handler
, (unsigned long) ka
->sa
.sa_handler
)
128 ctf_integer(unsigned long, sa_flags
, ka
->sa
.sa_flags
)
133 #if (LINUX_VERSION_CODE < KERNEL_VERSION(3,4,0))
134 LTTNG_TRACEPOINT_EVENT_CLASS(signal_queue_overflow
,
136 TP_PROTO(int sig
, int group
, struct siginfo
*info
),
138 TP_ARGS(sig
, group
, info
),
141 ctf_integer(int, sig
, sig
)
142 ctf_integer(int, group
, group
)
143 LTTNG_FIELDS_SIGINFO(info
)
148 * signal_overflow_fail - called when signal queue is overflow
149 * @sig: signal number
150 * @group: signal to process group or not (bool)
151 * @info: pointer to struct siginfo
153 * Kernel fails to generate 'sig' signal with 'info' siginfo, because
154 * siginfo queue is overflow, and the signal is dropped.
155 * 'group' is not 0 if the signal will be sent to a process group.
156 * 'sig' is always one of RT signals.
158 LTTNG_TRACEPOINT_EVENT_INSTANCE(signal_queue_overflow
, signal_overflow_fail
,
160 TP_PROTO(int sig
, int group
, struct siginfo
*info
),
162 TP_ARGS(sig
, group
, info
)
166 * signal_lose_info - called when siginfo is lost
167 * @sig: signal number
168 * @group: signal to process group or not (bool)
169 * @info: pointer to struct siginfo
171 * Kernel generates 'sig' signal but loses 'info' siginfo, because siginfo
173 * 'group' is not 0 if the signal will be sent to a process group.
174 * 'sig' is always one of non-RT signals.
176 LTTNG_TRACEPOINT_EVENT_INSTANCE(signal_queue_overflow
, signal_lose_info
,
178 TP_PROTO(int sig
, int group
, struct siginfo
*info
),
180 TP_ARGS(sig
, group
, info
)
184 #endif /* LTTNG_TRACE_SIGNAL_H */
186 /* This part must be outside protection */
187 #include <probes/define_trace.h>
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