[Qemu-devel] [PATCH] main-loop.c: Handle SIGINT, SIGHUP and SIGTERM synchronously

[Peter Maydell <peter.maydell@linaro.org>]

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 <peter.maydell@linaro.org>
Cc: qemu-stable@nongnu.org
---
 main-loop.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/main-loop.c b/main-loop.c
index 3cc79f8..8746abc 100644
--- a/main-loop.c
+++ b/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);
-- 
1.9.1