Handle terminating signals (Gerd Hoffmann)

This patch makes qemu handle signals better.  It sets the request_shutdown
flag, making the main_loop exit and qemu taking the usual exit route, with
atexit handlers being called and so on, instead of qemu just being killed
by the signal.

To avoid calling vm_start() from the signal handler main_loop() got an
additional check so qemu_system_shutdown_request() works even when the
vm is in stopped state.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>



git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@5055 c046a42c-6fe2-441c-8c8c-71466251a162

1 files changed, 27 insertions, 0 deletions

diff --git a/vl.c b/vl.c
index a4838b410d..df7b7a6916 100644
--- a/vl.c
+++ b/vl.c
@@ -7621,6 +7621,8 @@ static int main_loop(void)
                 timeout = 0;
             }
         } else {
+            if (shutdown_requested)
+                break;
             timeout = 10;
         }
 #ifdef CONFIG_PROFILER
@@ -8185,6 +8187,26 @@ static BOOL WINAPI qemu_ctrl_handler(DWORD type)
 
 #define MAX_NET_CLIENTS 32
 
+#ifndef _WIN32
+
+static void termsig_handler(int signal)
+{
+    qemu_system_shutdown_request();
+}
+
+void termsig_setup(void)
+{
+    struct sigaction act;
+
+    memset(&act, 0, sizeof(act));
+    act.sa_handler = termsig_handler;
+    sigaction(SIGINT,  &act, NULL);
+    sigaction(SIGHUP,  &act, NULL);
+    sigaction(SIGTERM, &act, NULL);
+}
+
+#endif
+
 int main(int argc, char **argv)
 {
 #ifdef CONFIG_GDBSTUB
@@ -9073,6 +9095,11 @@ int main(int argc, char **argv)
 #endif
     }
 
+#ifndef _WIN32
+    /* must be after terminal init, SDL library changes signal handlers */
+    termsig_setup();
+#endif
+
     /* Maintain compatibility with multiple stdio monitors */
     if (!strcmp(monitor_device,"stdio")) {
         for (i = 0; i < MAX_SERIAL_PORTS; i++) {