[tip:perf/core] perf tools: Introduce dump_stack signal helper

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

Commit-ID:  07c1a0dadfce976e9877c55ce5212dd14753c91d
Gitweb:     http://git.kernel.org/tip/07c1a0dadfce976e9877c55ce5212dd14753c91d
Author:     Arnaldo Carvalho de Melo <acme@redhat.com>
AuthorDate: Tue, 24 Feb 2015 15:34:23 -0300
Committer:  Arnaldo Carvalho de Melo <acme@redhat.com>
CommitDate: Tue, 24 Feb 2015 15:34:23 -0300

perf tools: Introduce dump_stack signal helper

To use in stdio based tools, like 'trace'.

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Borislav Petkov <bp@suse.de>
Cc: David Ahern <dsahern@gmail.com>
Cc: Don Zickus <dzickus@redhat.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/n/tip-79kjmerlw6d88csyx1afzwvn@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
 tools/perf/util/util.c | 7 +++++++
 tools/perf/util/util.h | 1 +
 2 files changed, 8 insertions(+)

diff --git a/tools/perf/util/util.c b/tools/perf/util/util.c
index 92db3f1..4ee6d0d 100644
--- a/tools/perf/util/util.c
+++ b/tools/perf/util/util.c
@@ -269,6 +269,13 @@ void dump_stack(void)
 void dump_stack(void) {}
 #endif
 
+void sighandler_dump_stack(int sig)
+{
+	psignal(sig, "perf");
+	dump_stack();
+	exit(sig);
+}
+
 void get_term_dimensions(struct winsize *ws)
 {
 	char *s = getenv("LINES");
diff --git a/tools/perf/util/util.h b/tools/perf/util/util.h
index 73c2f8e..fbd598a 100644
--- a/tools/perf/util/util.h
+++ b/tools/perf/util/util.h
@@ -277,6 +277,7 @@ char *ltrim(char *s);
 char *rtrim(char *s);
 
 void dump_stack(void);
+void sighandler_dump_stack(int sig);
 
 extern unsigned int page_size;
 extern int cacheline_size;