2 #define TRACE_SYSTEM signal
4 #if !defined(_TRACE_SIGNAL_H) || defined(TRACE_HEADER_MULTI_READ)
5 #define _TRACE_SIGNAL_H
7 #include <linux/signal.h>
8 #include <linux/sched.h>
9 #include <linux/tracepoint.h>
11 #define TP_STORE_SIGINFO(__entry, info) \
13 if (info == SEND_SIG_NOINFO) { \
15 __entry->code = SI_USER; \
16 } else if (info == SEND_SIG_PRIV) { \
18 __entry->code = SI_KERNEL; \
20 __entry->errno = info->si_errno; \
21 __entry->code = info->si_code; \
26 * signal_generate - called when a signal is generated
28 * @info: pointer to struct siginfo
29 * @task: pointer to struct task_struct
31 * Current process sends a 'sig' signal to 'task' process with
32 * 'info' siginfo. If 'info' is SEND_SIG_NOINFO or SEND_SIG_PRIV,
33 * 'info' is not a pointer and you can't access its field. Instead,
34 * SEND_SIG_NOINFO means that si_code is SI_USER, and SEND_SIG_PRIV
35 * means that si_code is SI_KERNEL.
37 TRACE_EVENT(signal_generate,
39 TP_PROTO(int sig, struct siginfo *info, struct task_struct *task),
41 TP_ARGS(sig, info, task),
47 __array( char, comm, TASK_COMM_LEN )
53 TP_STORE_SIGINFO(__entry, info);
54 memcpy(__entry->comm, task->comm, TASK_COMM_LEN);
55 __entry->pid = task->pid;
58 TP_printk("sig=%d errno=%d code=%d comm=%s pid=%d",
59 __entry->sig, __entry->errno, __entry->code,
60 __entry->comm, __entry->pid)
64 * signal_deliver - called when a signal is delivered
66 * @info: pointer to struct siginfo
67 * @ka: pointer to struct k_sigaction
69 * A 'sig' signal is delivered to current process with 'info' siginfo,
70 * and it will be handled by 'ka'. ka->sa.sa_handler can be SIG_IGN or
72 * Note that some signals reported by signal_generate tracepoint can be
73 * lost, ignored or modified (by debugger) before hitting this tracepoint.
74 * This means, this can show which signals are actually delivered, but
75 * matching generated signals and delivered signals may not be correct.
77 TRACE_EVENT(signal_deliver,
79 TP_PROTO(int sig, struct siginfo *info, struct k_sigaction *ka),
81 TP_ARGS(sig, info, ka),
87 __field( unsigned long, sa_handler )
88 __field( unsigned long, sa_flags )
93 TP_STORE_SIGINFO(__entry, info);
94 __entry->sa_handler = (unsigned long)ka->sa.sa_handler;
95 __entry->sa_flags = ka->sa.sa_flags;
98 TP_printk("sig=%d errno=%d code=%d sa_handler=%lx sa_flags=%lx",
99 __entry->sig, __entry->errno, __entry->code,
100 __entry->sa_handler, __entry->sa_flags)
103 DECLARE_EVENT_CLASS(signal_queue_overflow,
105 TP_PROTO(int sig, int group, struct siginfo *info),
107 TP_ARGS(sig, group, info),
111 __field( int, group )
112 __field( int, errno )
118 __entry->group = group;
119 TP_STORE_SIGINFO(__entry, info);
122 TP_printk("sig=%d group=%d errno=%d code=%d",
123 __entry->sig, __entry->group, __entry->errno, __entry->code)
127 * signal_overflow_fail - called when signal queue is overflow
128 * @sig: signal number
129 * @group: signal to process group or not (bool)
130 * @info: pointer to struct siginfo
132 * Kernel fails to generate 'sig' signal with 'info' siginfo, because
133 * siginfo queue is overflow, and the signal is dropped.
134 * 'group' is not 0 if the signal will be sent to a process group.
135 * 'sig' is always one of RT signals.
137 DEFINE_EVENT(signal_queue_overflow, signal_overflow_fail,
139 TP_PROTO(int sig, int group, struct siginfo *info),
141 TP_ARGS(sig, group, info)
145 * signal_lose_info - called when siginfo is lost
146 * @sig: signal number
147 * @group: signal to process group or not (bool)
148 * @info: pointer to struct siginfo
150 * Kernel generates 'sig' signal but loses 'info' siginfo, because siginfo
152 * 'group' is not 0 if the signal will be sent to a process group.
153 * 'sig' is always one of non-RT signals.
155 DEFINE_EVENT(signal_queue_overflow, signal_lose_info,
157 TP_PROTO(int sig, int group, struct siginfo *info),
159 TP_ARGS(sig, group, info)
162 #endif /* _TRACE_SIGNAL_H */
164 /* This part must be outside protection */
165 #include <trace/define_trace.h>