From a29e2b30f57cf1aeb5b887278236b4305da1269f Mon Sep 17 00:00:00 2001
From: Arnaldo Carvalho de Melo <acme@redhat.com>
Date: Mon, 16 Nov 2009 19:30:27 -0200
Subject: [PATCH] --- yaml --- r: 169633 b: refs/heads/master c:
 3b6ed98895b0fccd8c387f3fc44016fb922c0658 h: refs/heads/master i:   169631:
 b5d4487a21e3c92144561a734a84453f3ba1cb68 v: v3

---
 [refs]                         |  2 +-
 trunk/tools/perf/builtin-top.c | 42 +++++++++++++++++++++++++++++++++-
 2 files changed, 42 insertions(+), 2 deletions(-)

diff --git a/[refs] b/[refs]
index 674536876030..45baebeaf37d 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: dc79c0fc08a94b857aed446bfb47cdfde529400c
+refs/heads/master: 3b6ed98895b0fccd8c387f3fc44016fb922c0658
diff --git a/trunk/tools/perf/builtin-top.c b/trunk/tools/perf/builtin-top.c
index 6613f988a33e..3af95203208a 100644
--- a/trunk/tools/perf/builtin-top.c
+++ b/trunk/tools/perf/builtin-top.c
@@ -60,7 +60,7 @@ static int			system_wide			=      0;
 static int			default_interval		=      0;
 
 static int			count_filter			=      5;
-static int			print_entries			=     15;
+static int			print_entries;
 
 static int			target_pid			=     -1;
 static int			inherit				=      0;
@@ -115,6 +115,36 @@ struct sym_entry {
  * Source functions
  */
 
+/* most GUI terminals set LINES (although some don't export it) */
+static int term_rows(void)
+{
+	char *lines_string = getenv("LINES");
+	int n_lines;
+
+	if (lines_string && (n_lines = atoi(lines_string)) > 0)
+		return n_lines;
+#ifdef TIOCGWINSZ
+	else {
+		struct winsize ws;
+		if (!ioctl(1, TIOCGWINSZ, &ws) && ws.ws_row)
+			return ws.ws_row;
+	}
+#endif
+	return 25;
+}
+
+static void update_print_entries(void)
+{
+	print_entries = term_rows();
+	if (print_entries > 9)
+		print_entries -= 9;
+}
+
+static void sig_winch_handler(int sig __used)
+{
+	update_print_entries();
+}
+
 static void parse_source(struct sym_entry *syme)
 {
 	struct symbol *sym;
@@ -668,6 +698,11 @@ static void handle_keypress(int c)
 			break;
 		case 'e':
 			prompt_integer(&print_entries, "Enter display entries (lines)");
+			if (print_entries == 0) {
+				update_print_entries();
+				signal(SIGWINCH, sig_winch_handler);
+			} else
+				signal(SIGWINCH, SIG_DFL);
 			break;
 		case 'E':
 			if (nr_counters > 1) {
@@ -1228,5 +1263,10 @@ int cmd_top(int argc, const char **argv, const char *prefix __used)
 	if (target_pid != -1 || profile_cpu != -1)
 		nr_cpus = 1;
 
+	if (print_entries == 0) {
+		update_print_entries();
+		signal(SIGWINCH, sig_winch_handler);
+	}
+
 	return __cmd_top();
 }