From f969a7ac4b105b989d9edcef83cc28677e186a92 Mon Sep 17 00:00:00 2001
From: Jaakko Heinonen <jh@FreeBSD.org>
Date: Sun, 15 Nov 2009 14:11:26 +0000
Subject: [PATCH] MFC r197956:

- Catch SIGHUP to perform cleanup before exiting.
- Exit if getch() returns with an error other than EINTR. Otherwise
  systat(1) may get stuck in an infinite loop if it doesn't receive
  SIGHUP when terminal closes.
- Remove attempt to clear stdio error indicators. getch() doesn't use
  stdio, making it useless.
- Remove unneeded masking of getch() return value.

PR:		bin/107171
Approved by:	trasz (mentor)
---
 usr.bin/systat/keyboard.c | 11 +++++++----
 usr.bin/systat/main.c     |  1 +
 2 files changed, 8 insertions(+), 4 deletions(-)

diff --git a/usr.bin/systat/keyboard.c b/usr.bin/systat/keyboard.c
index 7784f5be98a3..0ab28eb2603e 100644
--- a/usr.bin/systat/keyboard.c
+++ b/usr.bin/systat/keyboard.c
@@ -39,8 +39,10 @@ __FBSDID("$FreeBSD$");
 static const char sccsid[] = "@(#)keyboard.c	8.1 (Berkeley) 6/6/93";
 #endif
 
+#include <errno.h>
 #include <ctype.h>
 #include <signal.h>
+#include <stdlib.h>
 #include <termios.h>
 
 #include "systat.h"
@@ -57,10 +59,11 @@ keyboard(void)
                 move(CMDLINE, 0);
                 do {
                         refresh();
-                        ch = getch() & 0177;
-                        if (ch == 0177 && ferror(stdin)) {
-                                clearerr(stdin);
-                                continue;
+                        ch = getch();
+                        if (ch == ERR) {
+                                if (errno == EINTR)
+                                        continue;
+                                exit(1);
                         }
                         if (ch >= 'A' && ch <= 'Z')
                                 ch += 'a' - 'A';
diff --git a/usr.bin/systat/main.c b/usr.bin/systat/main.c
index 28673e54e6b7..6f6b99406860 100644
--- a/usr.bin/systat/main.c
+++ b/usr.bin/systat/main.c
@@ -133,6 +133,7 @@ main(int argc, char **argv)
 			exit(1);
 		}
 	}
+	signal(SIGHUP, die);
 	signal(SIGINT, die);
 	signal(SIGQUIT, die);
 	signal(SIGTERM, die);