linux-kernel - [PATCH 16/19] perf ftrace: Add a signal handler for SIGSEGV

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Date:	Wed, 26 Jun 2013 16:14:19 +0900
From:	Namhyung Kim <namhyung@...nel.org>
To:	Arnaldo Carvalho de Melo <acme@...stprotocols.net>
Cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Paul Mackerras <paulus@...ba.org>,
	Ingo Molnar <mingo@...nel.org>,
	Namhyung Kim <namhyung.kim@....com>,
	LKML <linux-kernel@...r.kernel.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Jiri Olsa <jolsa@...hat.com>, David Ahern <dsahern@...il.com>,
	Stephane Eranian <eranian@...gle.com>
Subject: [PATCH 16/19] perf ftrace: Add a signal handler for SIGSEGV

From: Namhyung Kim <namhyung.kim@....com>

It's for debugging purpose.

Cc: Steven Rostedt <rostedt@...dmis.org>
Cc: Frederic Weisbecker <fweisbec@...il.com>
Signed-off-by: Namhyung Kim <namhyung@...nel.org>
---
 tools/perf/builtin-ftrace.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/tools/perf/builtin-ftrace.c b/tools/perf/builtin-ftrace.c
index 698dd0b5cecf..3b6bcc29715b 100644
--- a/tools/perf/builtin-ftrace.c
+++ b/tools/perf/builtin-ftrace.c
@@ -41,6 +41,13 @@ struct perf_ftrace {
 
 static bool done;
 
+static void sig_exit(int sig)
+{
+	psignal(sig, "perf");
+	signal(sig, SIG_DFL);
+	raise(sig);
+}
+
 static void sig_handler(int sig __maybe_unused)
 {
 	done = true;
@@ -228,6 +235,7 @@ static int do_ftrace_live(struct perf_ftrace *ftrace)
 	signal(SIGUSR1, sig_handler);
 	signal(SIGCHLD, sig_handler);
 	signal(SIGPIPE, sig_handler);
+	signal(SIGSEGV, sig_exit);
 
 	if (setup_tracing_files(ftrace) < 0)
 		goto out_reset;
@@ -599,6 +607,7 @@ static int do_ftrace_record(struct perf_ftrace *ftrace)
 	signal(SIGINT, sig_handler);
 	signal(SIGUSR1, sig_handler);
 	signal(SIGCHLD, sig_handler);
+	signal(SIGSEGV, sig_exit);
 
 	if (setup_tracing_files(ftrace) < 0)
 		goto out_reset;
@@ -1100,6 +1109,8 @@ static int do_ftrace_show(struct perf_ftrace *ftrace)
 		},
 	};
 
+	signal(SIGSEGV, sig_exit);
+
 	scnprintf(buf, sizeof(buf), "%s.dir/perf.header", ftrace->dirname);
 
 	session = perf_session__new(buf, O_RDONLY, false, false, &show.tool);
@@ -1189,6 +1200,8 @@ static int do_ftrace_report(struct perf_ftrace *ftrace)
 	struct machine *machine;
 	struct dso *dso;
 
+	signal(SIGSEGV, sig_exit);
+
 	scnprintf(buf, sizeof(buf), "%s.dir/perf.header", ftrace->dirname);
 
 	session = perf_session__new(buf, O_RDONLY, false, false, &report.tool);
-- 
1.7.11.7

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