perf top: Use signal interface for SIGWINCH handler

There's no need for SA_SIGINFO data in SIGWINCH handler, switching it to
register the handler via signal interface as we do for the rest of the
signals in perf top.

Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Tested-by: Ravi Bangoria <ravi.bangoria@linux.vnet.ibm.com>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Andi Kleen <andi@firstfloor.org>
Cc: David Ahern <dsahern@gmail.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Wang Nan <wangnan0@huawei.com>
Link: http://lkml.kernel.org/n/tip-elxp1vdnaog1scaj13cx7cu0@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

1 files changed, 3 insertions, 12 deletions

diff --git a/tools/perf/builtin-top.c b/tools/perf/builtin-top.c
index 489573883936..9e0d2645ae13 100644
--- a/tools/perf/builtin-top.c
+++ b/tools/perf/builtin-top.c
@@ -86,8 +86,7 @@ static void perf_top__update_print_entries(struct perf_top *top)
         top->print_entries = top->winsize.ws_row - HEADER_LINE_NR;
 }
 
-static void perf_top__sig_winch(int sig __maybe_unused,
-                                siginfo_t *info __maybe_unused, void *arg __maybe_unused)
+static void winch_sig(int sig __maybe_unused)
 {
         resize = 1;
 }
@@ -477,12 +476,8 @@ static bool perf_top__handle_keypress(struct perf_top *top, int c)
                 case 'e':
                         prompt_integer(&top->print_entries, "Enter display entries (lines)");
                         if (top->print_entries == 0) {
-                                struct sigaction act = {
-                                        .sa_sigaction = perf_top__sig_winch,
-                                        .sa_flags     = SA_SIGINFO,
-                                };
                                 perf_top__resize(top);
-                                sigaction(SIGWINCH, &act, NULL);
+                                signal(SIGWINCH, winch_sig);
                         } else {
                                 signal(SIGWINCH, SIG_DFL);
                         }
@@ -1363,12 +1358,8 @@ int cmd_top(int argc, const char **argv)
 
         get_term_dimensions(&top.winsize);
         if (top.print_entries == 0) {
-                struct sigaction act = {
-                        .sa_sigaction = perf_top__sig_winch,
-                        .sa_flags     = SA_SIGINFO,
-                };
                 perf_top__update_print_entries(&top);
-                sigaction(SIGWINCH, &act, NULL);
+                signal(SIGWINCH, winch_sig);
         }
 
         status = __cmd_top(&top);