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authorMasami Hiramatsu <mhiramat@redhat.com>2009-11-24 16:56:51 -0500
committerIngo Molnar <mingo@elte.hu>2009-11-26 10:55:38 +0100
commitf9d4257e01d266e67420cc99d456b6d4c8464f54 (patch)
tree6661efc95e3002b9b1bf8d9c94deb9ec736a04de
parentd1eb650ff4130972fa21462fa49cd35a2865403b (diff)
downloadop-kernel-dev-f9d4257e01d266e67420cc99d456b6d4c8464f54.zip
op-kernel-dev-f9d4257e01d266e67420cc99d456b6d4c8464f54.tar.gz
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: Masami Hiramatsu <mhiramat@redhat.com> Reviewed-by: Jason Baron <jbaron@redhat.com> Acked-by: Roland 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: Ingo Molnar <mingo@elte.hu>
-rw-r--r--include/trace/events/signal.h39
-rw-r--r--kernel/signal.c3
2 files changed, 42 insertions, 0 deletions
diff --git a/include/trace/events/signal.h b/include/trace/events/signal.h
index ef51756..a6d71de 100644
--- a/include/trace/events/signal.h
+++ b/include/trace/events/signal.h
@@ -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
+ * 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 */
/* This part must be outside protection */
diff --git a/kernel/signal.c b/kernel/signal.c
index a1e0cc6..349d449 100644
--- a/kernel/signal.c
+++ b/kernel/signal.c
@@ -1840,6 +1840,9 @@ relock:
ka = &sighand->action[signr-1];
}
+ /* Trace actually delivered signals. */
+ trace_signal_deliver(signr, info, ka);
+
if (ka->sa.sa_handler == SIG_IGN) /* Do nothing. */
continue;
if (ka->sa.sa_handler != SIG_DFL) {
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