linux-kernel - [tip:perf/core] perf top: Use signal interface for SIGWINCH handler

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Date:   Tue, 28 Nov 2017 22:34:46 -0800
From:   tip-bot for Jiri Olsa <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     mingo@...nel.org, tglx@...utronix.de, dsahern@...il.com,
        wangnan0@...wei.com, ravi.bangoria@...ux.vnet.ibm.com,
        acme@...hat.com, adrian.hunter@...el.com, andi@...stfloor.org,
        namhyung@...nel.org, linux-kernel@...r.kernel.org, hpa@...or.com,
        jolsa@...nel.org
Subject: [tip:perf/core] perf top: Use signal interface for SIGWINCH handler

Commit-ID:  bdaab8c4b3db820b0946ed4516bc5ec811e0cc82
Gitweb:     https://git.kernel.org/tip/bdaab8c4b3db820b0946ed4516bc5ec811e0cc82
Author:     Jiri Olsa <jolsa@...nel.org>
AuthorDate: Wed, 15 Nov 2017 14:30:57 +0100
Committer:  Arnaldo Carvalho de Melo <acme@...hat.com>
CommitDate: Tue, 28 Nov 2017 14:27:43 -0300

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@...nel.org>
Tested-by: Ravi Bangoria <ravi.bangoria@...ux.vnet.ibm.com>
Tested-by: Arnaldo Carvalho de Melo <acme@...hat.com>
Cc: Adrian Hunter <adrian.hunter@...el.com>
Cc: Andi Kleen <andi@...stfloor.org>
Cc: David Ahern <dsahern@...il.com>
Cc: Namhyung Kim <namhyung@...nel.org>
Cc: Wang Nan <wangnan0@...wei.com>
Link: http://lkml.kernel.org/n/tip-elxp1vdnaog1scaj13cx7cu0@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 tools/perf/builtin-top.c | 15 +++------------
 1 file changed, 3 insertions(+), 12 deletions(-)

diff --git a/tools/perf/builtin-top.c b/tools/perf/builtin-top.c
index 4895738..9e0d264 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);