2 #define TRACE_SYSTEM signal
4 #if !defined(LTTNG_TRACE_SIGNAL_H) || defined(TRACE_HEADER_MULTI_READ)
5 #define LTTNG_TRACE_SIGNAL_H
7 #include <probes/lttng-tracepoint-event.h>
8 #include <linux/version.h>
10 #ifndef _TRACE_SIGNAL_DEF
11 #define _TRACE_SIGNAL_DEF
12 #include <linux/signal.h>
13 #include <linux/sched.h>
14 #undef LTTNG_FIELDS_SIGINFO
15 #define LTTNG_FIELDS_SIGINFO(info) \
16 ctf_integer(int, errno, \
17 (info == SEND_SIG_NOINFO || info == SEND_SIG_FORCED || info == SEND_SIG_PRIV) ? \
20 ctf_integer(int, code, \
21 (info == SEND_SIG_NOINFO || info == SEND_SIG_FORCED) ? \
23 ((info == SEND_SIG_PRIV) ? SI_KERNEL : info->si_code))
24 #endif /* _TRACE_SIGNAL_DEF */
27 * signal_generate - called when a signal is generated
29 * @info: pointer to struct siginfo
30 * @task: pointer to struct task_struct
32 * Current process sends a 'sig' signal to 'task' process with
33 * 'info' siginfo. If 'info' is SEND_SIG_NOINFO or SEND_SIG_PRIV,
34 * 'info' is not a pointer and you can't access its field. Instead,
35 * SEND_SIG_NOINFO means that si_code is SI_USER, and SEND_SIG_PRIV
36 * means that si_code is SI_KERNEL.
38 #if (LINUX_VERSION_CODE < KERNEL_VERSION(3,4,0))
39 LTTNG_TRACEPOINT_EVENT(signal_generate
,
41 TP_PROTO(int sig
, struct siginfo
*info
, struct task_struct
*task
),
43 TP_ARGS(sig
, info
, task
),
46 ctf_integer(int, sig
, sig
)
47 LTTNG_FIELDS_SIGINFO(info
)
48 ctf_array_text(char, comm
, task
->comm
, TASK_COMM_LEN
)
49 ctf_integer(pid_t
, pid
, task
->pid
)
53 LTTNG_TRACEPOINT_EVENT(signal_generate
,
55 TP_PROTO(int sig
, struct siginfo
*info
, struct task_struct
*task
,
56 int group
, int result
),
58 TP_ARGS(sig
, info
, task
, group
, result
),
61 ctf_integer(int, sig
, sig
)
62 LTTNG_FIELDS_SIGINFO(info
)
63 ctf_array_text(char, comm
, task
->comm
, TASK_COMM_LEN
)
64 ctf_integer(pid_t
, pid
, task
->pid
)
65 ctf_integer(int, group
, group
)
66 ctf_integer(int, result
, result
)
72 * signal_deliver - called when a signal is delivered
74 * @info: pointer to struct siginfo
75 * @ka: pointer to struct k_sigaction
77 * A 'sig' signal is delivered to current process with 'info' siginfo,
78 * and it will be handled by 'ka'. ka->sa.sa_handler can be SIG_IGN or
80 * Note that some signals reported by signal_generate tracepoint can be
81 * lost, ignored or modified (by debugger) before hitting this tracepoint.
82 * This means, this can show which signals are actually delivered, but
83 * matching generated signals and delivered signals may not be correct.
85 LTTNG_TRACEPOINT_EVENT(signal_deliver
,
87 TP_PROTO(int sig
, struct siginfo
*info
, struct k_sigaction
*ka
),
89 TP_ARGS(sig
, info
, ka
),
92 ctf_integer(int, sig
, sig
)
93 LTTNG_FIELDS_SIGINFO(info
)
94 ctf_integer(unsigned long, sa_handler
, (unsigned long) ka
->sa
.sa_handler
)
95 ctf_integer(unsigned long, sa_flags
, ka
->sa
.sa_flags
)
99 #if (LINUX_VERSION_CODE < KERNEL_VERSION(3,4,0))
100 LTTNG_TRACEPOINT_EVENT_CLASS(signal_queue_overflow
,
102 TP_PROTO(int sig
, int group
, struct siginfo
*info
),
104 TP_ARGS(sig
, group
, info
),
107 ctf_integer(int, sig
, sig
)
108 ctf_integer(int, group
, group
)
109 LTTNG_FIELDS_SIGINFO(info
)
114 * signal_overflow_fail - called when signal queue is overflow
115 * @sig: signal number
116 * @group: signal to process group or not (bool)
117 * @info: pointer to struct siginfo
119 * Kernel fails to generate 'sig' signal with 'info' siginfo, because
120 * siginfo queue is overflow, and the signal is dropped.
121 * 'group' is not 0 if the signal will be sent to a process group.
122 * 'sig' is always one of RT signals.
124 LTTNG_TRACEPOINT_EVENT_INSTANCE(signal_queue_overflow
, signal_overflow_fail
,
126 TP_PROTO(int sig
, int group
, struct siginfo
*info
),
128 TP_ARGS(sig
, group
, info
)
132 * signal_lose_info - called when siginfo is lost
133 * @sig: signal number
134 * @group: signal to process group or not (bool)
135 * @info: pointer to struct siginfo
137 * Kernel generates 'sig' signal but loses 'info' siginfo, because siginfo
139 * 'group' is not 0 if the signal will be sent to a process group.
140 * 'sig' is always one of non-RT signals.
142 LTTNG_TRACEPOINT_EVENT_INSTANCE(signal_queue_overflow
, signal_lose_info
,
144 TP_PROTO(int sig
, int group
, struct siginfo
*info
),
146 TP_ARGS(sig
, group
, info
)
150 #endif /* LTTNG_TRACE_SIGNAL_H */
152 /* This part must be outside protection */
153 #include <probes/define_trace.h>
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