perf tools: Make Ctrl-C stop processing on TUI

It was inconvenient that perf cannot be quit with SIGINT during
processing samples on TUI especially for large data files.

This was because the first argument of SLang_init_tty(), abort_char,
being 0.  The manual says it's the ascii value of the control character
that will be used to generate the interrupt signal [1].  Passing -1
means to use the default value (Ctrl-C).

However, after processing samples, Ctrl-C was used to in other cases as
well - like stepping back from annotate.  So recover the original
behavior after processing.

[1] http://jedsoft.org/slang/doc/html/cslang-6.html#ss6.1

Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/1432904024-13170-1-git-send-email-namhyung@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

3 files changed, 9 insertions, 1 deletions

diff --git a/tools/perf/ui/browsers/annotate.c b/tools/perf/ui/browsers/annotate.c
index e5250eb2dd57..acb0e23b138e 100644
--- a/tools/perf/ui/browsers/annotate.c
+++ b/tools/perf/ui/browsers/annotate.c
@@ -838,6 +838,10 @@ int map_symbol__tui_annotate(struct map_symbol *ms, struct perf_evsel *evsel,
 int hist_entry__tui_annotate(struct hist_entry *he, struct perf_evsel *evsel,
                              struct hist_browser_timer *hbt)
 {
+        /* reset abort key so that it can get Ctrl-C as a key */
+        SLang_reset_tty();
+        SLang_init_tty(0, 0, 0);
+
         return map_symbol__tui_annotate(&he->ms, evsel, hbt);
 }
 
diff --git a/tools/perf/ui/browsers/hists.c b/tools/perf/ui/browsers/hists.c
index f981cb8f0158..e64893f2fd7f 100644
--- a/tools/perf/ui/browsers/hists.c
+++ b/tools/perf/ui/browsers/hists.c
@@ -1741,6 +1741,10 @@ static int perf_evsel__hists_browse(struct perf_evsel *evsel, int nr_events,
         if (browser == NULL)
                 return -1;
 
+        /* reset abort key so that it can get Ctrl-C as a key */
+        SLang_reset_tty();
+        SLang_init_tty(0, 0, 0);
+
         if (min_pcnt) {
                 browser->min_pcnt = min_pcnt;
                 hist_browser__update_nr_entries(browser);
diff --git a/tools/perf/ui/tui/setup.c b/tools/perf/ui/tui/setup.c
index b77e1d771363..60d1f29b4b50 100644
--- a/tools/perf/ui/tui/setup.c
+++ b/tools/perf/ui/tui/setup.c
@@ -129,7 +129,7 @@ int ui__init(void)
         err = SLsmg_init_smg();
         if (err < 0)
                 goto out;
-        err = SLang_init_tty(0, 0, 0);
+        err = SLang_init_tty(-1, 0, 0);
         if (err < 0)
                 goto out;