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

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 <mhiramat@redhat.com>
Reviewed-by: default avatarJason Baron <jbaron@redhat.com>
Acked-by: default avatarRoland McGrath <roland@redhat.com>
Cc: systemtap <systemtap@sources.redhat.com>
Cc: DLE <dle-develop@lists.sourceforge.net>
Cc: Oleg Nesterov <oleg@redhat.com>
LKML-Reference: <20091124215651.30449.20926.stgit@dhcp-100-2-132.bos.redhat.com>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent d1eb650f

include/trace/events/signal.h

+39 −0
Original line number Original line Diff line number Diff line
@@ -60,6 +60,45 @@ TRACE_EVENT(signal_generate, 
		  __entry->comm, __entry->pid)

		  __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

 * SIG_DFL.

 * 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.

 */

TRACE_EVENT(signal_deliver,



	TP_PROTO(int sig, struct siginfo *info, struct k_sigaction *ka),



	TP_ARGS(sig, info, ka),



	TP_STRUCT__entry(

		__field(	int,		sig		)

		__field(	int,		errno		)

		__field(	int,		code		)

		__field(	unsigned long,	sa_handler	)

		__field(	unsigned long,	sa_flags	)

	),



	TP_fast_assign(

		__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 */

#endif /* _TRACE_SIGNAL_H */





/* This part must be outside protection */

/* This part must be outside protection */

kernel/signal.c

+3 −0
Original line number Original line Diff line number Diff line
@@ -1840,6 +1840,9 @@ int get_signal_to_deliver(siginfo_t *info, struct k_sigaction *return_ka, 
			ka = &sighand->action[signr-1];

			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_IGN) /* Do nothing.  */

			continue;

			continue;

		if (ka->sa.sa_handler != SIG_DFL) {

		if (ka->sa.sa_handler != SIG_DFL) {