Commit f9d4257e authored by Masami Hiramatsu's avatar Masami Hiramatsu Committed by Ingo Molnar

tracepoint: Add signal deliver event

Add a tracepoint where a process gets a signal. This tracepoint
shows signal-number, sa-handler and sa-flag.

Changes in v3:
 - Add docbook style comments

Changes in v2:
 - Add siginfo argument
 - Fix comment
Signed-off-by: default avatarMasami Hiramatsu <>
Reviewed-by: default avatarJason Baron <>
Acked-by: default avatarRoland McGrath <>
Cc: systemtap <>
Cc: DLE <>
Cc: Oleg Nesterov <>
LKML-Reference: <>
Signed-off-by: default avatarIngo Molnar <>
parent d1eb650f
......@@ -60,6 +60,45 @@ TRACE_EVENT(signal_generate,
__entry->comm, __entry->pid)
* signal_deliver - called when a signal is delivered
* @sig: signal number
* @info: pointer to struct siginfo
* @ka: pointer to struct k_sigaction
* A 'sig' signal is delivered to current process with 'info' siginfo,
* and it will be handled by 'ka'. ka->sa.sa_handler can be SIG_IGN or
* Note that some signals reported by signal_generate tracepoint can be
* lost, ignored or modified (by debugger) before hitting this tracepoint.
* This means, this can show which signals are actually delivered, but
* matching generated signals and delivered signals may not be correct.
TP_PROTO(int sig, struct siginfo *info, struct k_sigaction *ka),
TP_ARGS(sig, info, ka),
__field( int, sig )
__field( int, errno )
__field( int, code )
__field( unsigned long, sa_handler )
__field( unsigned long, sa_flags )
__entry->sig = sig;
TP_STORE_SIGINFO(__entry, info);
__entry->sa_handler = (unsigned long)ka->sa.sa_handler;
__entry->sa_flags = ka->sa.sa_flags;
TP_printk("sig=%d errno=%d code=%d sa_handler=%lx sa_flags=%lx",
__entry->sig, __entry->errno, __entry->code,
__entry->sa_handler, __entry->sa_flags)
#endif /* _TRACE_SIGNAL_H */
/* This part must be outside protection */
......@@ -1840,6 +1840,9 @@ int get_signal_to_deliver(siginfo_t *info, struct k_sigaction *return_ka,
ka = &sighand->action[signr-1];
/* Trace actually delivered signals. */
trace_signal_deliver(signr, info, ka);
if (ka->sa.sa_handler == SIG_IGN) /* Do nothing. */
if (ka->sa.sa_handler != SIG_DFL) {
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