[tip:perf/core] perf tools: Use same signal handling strategy as 'record'

[tip-bot for Arnaldo Carvalho de Melo <tipbot@zytor.com>]

Commit-ID:  9daddf66a37708ec7182a7058f159166d12c9812
Gitweb:     http://git.kernel.org/tip/9daddf66a37708ec7182a7058f159166d12c9812
Author:     Arnaldo Carvalho de Melo <acme@redhat.com>
AuthorDate: Fri, 11 Dec 2015 16:43:57 -0300
Committer:  Arnaldo Carvalho de Melo <acme@redhat.com>
CommitDate: Mon, 14 Dec 2015 12:08:55 -0300

perf tools: Use same signal handling strategy as 'record'

I.e. don't exit with the signal number, instead set the signal handler
to the default one and then raise it again.

Noticed while trying to dump the stack at segfaults in the 'perf test'
forked process used to run each test, that inspects signal info at
each test.

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Wang Nan <wangnan0@huawei.com>
Link: http://lkml.kernel.org/n/tip-5x5r176wnoqxi5p6id05wv9w@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
 tools/perf/util/util.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/tools/perf/util/util.c b/tools/perf/util/util.c
index 07da970..aff0cfd 100644
--- a/tools/perf/util/util.c
+++ b/tools/perf/util/util.c
@@ -352,7 +352,8 @@ void sighandler_dump_stack(int sig)
 {
 	psignal(sig, "perf");
 	dump_stack();
-	exit(sig);
+	signal(sig, SIG_DFL);
+	raise(sig);
 }
 
 int parse_nsec_time(const char *str, u64 *ptime)