[Xen-devel] [PATCH 01/13] Handle terminating signals.

[Gerd Hoffmann <kraxel@xxxxxxxxxx>]

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@xxxxxxxxxx>
---
 curses.c |    2 --
 sdl.c    |    9 +--------
 vl.c     |   27 +++++++++++++++++++++++++++
 3 files changed, 28 insertions(+), 10 deletions(-)

diff --git a/curses.c b/curses.c
index d09eff2..96b6e49 100644
--- a/curses.c
+++ b/curses.c
@@ -350,8 +350,6 @@ void curses_display_init(DisplayState *ds, int full_screen)
     atexit(curses_atexit);
 
 #ifndef _WIN32
-    signal(SIGINT, SIG_DFL);
-    signal(SIGQUIT, SIG_DFL);
 #if defined(SIGWINCH) && defined(KEY_RESIZE)
     /* some curses implementations provide a handler, but we
      * want to be sure this is handled regardless of the library */
diff --git a/sdl.c b/sdl.c
index 0edc4a0..84a9d6d 100644
--- a/sdl.c
+++ b/sdl.c
@@ -476,10 +476,8 @@ static void sdl_refresh(DisplayState *ds)
                 sdl_process_key(&ev->key);
             break;
         case SDL_QUIT:
-            if (!no_quit) {
+            if (!no_quit)
                 qemu_system_shutdown_request();
-                vm_start();    /* In case we're paused */
-            }
             break;
         case SDL_MOUSEMOTION:
             if (gui_grab || kbd_mouse_is_absolute() ||
@@ -636,11 +634,6 @@ void sdl_display_init(DisplayState *ds, int full_screen, 
int no_frame)
         fprintf(stderr, "Could not initialize SDL - exiting\n");
         exit(1);
     }
-#ifndef _WIN32
-    /* NOTE: we still want Ctrl-C to work, so we undo the SDL redirections */
-    signal(SIGINT, SIG_DFL);
-    signal(SIGQUIT, SIG_DFL);
-#endif
 
     ds->dpy_update = sdl_update;
     ds->dpy_resize = sdl_resize;
diff --git a/vl.c b/vl.c
index fc5019f..071ee0c 100644
--- a/vl.c
+++ b/vl.c
@@ -7619,6 +7619,8 @@ static int main_loop(void)
                 timeout = 0;
             }
         } else {
+            if (shutdown_requested)
+                break;
             timeout = 10;
         }
 #ifdef CONFIG_PROFILER
@@ -8183,6 +8185,26 @@ 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
@@ -9071,6 +9093,11 @@ 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++) {
-- 
1.5.5.1


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