[Qemu-devel] [PATCH] Use SIGIO with caution

["Andreas Färber" <andreas.faerber@web.de>]

BeOS and Haiku don't define SIGIO. When undefined, it won't arrive
and doesn't need to be blocked.

Signed-off-by: Andreas Färber <andreas.faerber@web.de>
---
 cpus.c |    8 ++++++++
 1 files changed, 8 insertions(+), 0 deletions(-)

diff --git a/cpus.c b/cpus.c
index 1fc34b7..42af291 100644
--- a/cpus.c
+++ b/cpus.c
@@ -395,7 +395,9 @@ static int qemu_signal_init(void)
     pthread_sigmask(SIG_UNBLOCK, &set, NULL);
 
     sigemptyset(&set);
+#ifdef SIGIO
     sigaddset(&set, SIGIO);
+#endif
     sigaddset(&set, SIGALRM);
     sigaddset(&set, SIG_IPI);
     sigaddset(&set, SIGBUS);
@@ -408,7 +410,9 @@ static int qemu_signal_init(void)
          * We need to process timer signals synchronously to avoid a race
          * between exit_request check and KVM vcpu entry.
          */
+#ifdef SIGIO
         sigaddset(&set, SIGIO);
+#endif
         sigaddset(&set, SIGALRM);
     }
 #endif
@@ -449,12 +453,16 @@ static void qemu_kvm_init_cpu_signals(CPUState *env)
 #else
     sigemptyset(&set);
     sigaddset(&set, SIG_IPI);
+#ifdef SIGIO
     sigaddset(&set, SIGIO);
+#endif
     sigaddset(&set, SIGALRM);
     pthread_sigmask(SIG_BLOCK, &set, NULL);
 
     pthread_sigmask(SIG_BLOCK, NULL, &set);
+#ifdef SIGIO
     sigdelset(&set, SIGIO);
+#endif
     sigdelset(&set, SIGALRM);
 #endif
     sigdelset(&set, SIG_IPI);
-- 
1.7.5.3