main-loop.c: Handle SIGINT, SIGHUP and SIGTERM synchronously

Add the termination signals SIGINT, SIGHUP and SIGTERM to the
list of signals which we handle synchronously via a signalfd.
This avoids a race condition where if we took the SIGTERM
in the middle of qemu_shutdown_requested:
    int r = shutdown_requested;
[SIGTERM here...]
    shutdown_requested = 0;

then the setting of the shutdown_requested flag by
termsig_handler() would be lost and QEMU would fail to
shut down. This was causing 'make check' to hang occasionally.

Signed-off-by: Peter Maydell <[email protected]>
Reviewed-by: Paolo Bonzini <[email protected]>
Reviewed-by: Alex Bennée <[email protected]>
Tested-by: Alex Bennée <[email protected]>
Message-id: [email protected]
Cc: [email protected]

main-loop.c

@@ -84,6 +84,9 @@ static int qemu_signal_init(void)
     sigaddset(&set, SIGIO);
     sigaddset(&set, SIGALRM);
     sigaddset(&set, SIGBUS);
+    sigaddset(&set, SIGINT);
+    sigaddset(&set, SIGHUP);
+    sigaddset(&set, SIGTERM);
     pthread_sigmask(SIG_BLOCK, &set, NULL);
 
     sigdelset(&set, SIG_IPI);