[PATCH] kvm tools: Fix broken terminal when kvm exits because of a signal

[Anton Vorontsov <cbouatmailru@gmail.com>]

Issuing 'killall kvm' leaves the terminal on which kvm was running in
a broken state. This is because atexit(3) handlers are not called if
a process terminates because of a signal.

Installing a proper handler for the TERM signal fixes the issue.

p.s. The rest of the kvm tools use signal(2), and not sigaction(2), so
     I continue the tradition.

Signed-off-by: Anton Vorontsov <cbouatmailru@gmail.com>
---
 tools/kvm/term.c |    9 +++++++++
 1 files changed, 9 insertions(+), 0 deletions(-)

diff --git a/tools/kvm/term.c b/tools/kvm/term.c
index 689d52d..9947223 100644
--- a/tools/kvm/term.c
+++ b/tools/kvm/term.c
@@ -4,6 +4,7 @@
 #include <stdio.h>
 #include <unistd.h>
 #include <sys/uio.h>
+#include <signal.h>
 
 #include "kvm/read-write.h"
 #include "kvm/term.h"
@@ -102,6 +103,13 @@ static void term_cleanup(void)
 	tcsetattr(STDIN_FILENO, TCSANOW, &orig_term);
 }
 
+static void term_sig_cleanup(int sig)
+{
+	term_cleanup();
+	signal(sig, SIG_DFL);
+	raise(sig);
+}
+
 void term_init(void)
 {
 	struct termios term;
@@ -113,5 +121,6 @@ void term_init(void)
 	term.c_lflag &= ~(ICANON | ECHO | ISIG);
 	tcsetattr(STDIN_FILENO, TCSANOW, &term);
 
+	signal(SIGTERM, term_sig_cleanup);
 	atexit(term_cleanup);
 }
-- 
1.7.5.3