signal: sys_pause() should check signal_pending()
authorOleg Nesterov <oleg@redhat.com>
Wed, 25 May 2011 17:22:27 +0000 (19:22 +0200)
committerOleg Nesterov <oleg@redhat.com>
Wed, 25 May 2011 17:22:27 +0000 (19:22 +0200)
ERESTART* is always wrong without TIF_SIGPENDING. Teach sys_pause()
to handle the spurious wakeup correctly.

Signed-off-by: Oleg Nesterov <oleg@redhat.com>
kernel/signal.c

index ad5e818baacc43fb5e4046926bf52dde55acacfa..86c32b884f8efbb8f071b6343b3c37667b4e8fa3 100644 (file)
@@ -3023,8 +3023,10 @@ SYSCALL_DEFINE2(signal, int, sig, __sighandler_t, handler)
 
 SYSCALL_DEFINE0(pause)
 {
-       current->state = TASK_INTERRUPTIBLE;
-       schedule();
+       while (!signal_pending(current)) {
+               current->state = TASK_INTERRUPTIBLE;
+               schedule();
+       }
        return -ERESTARTNOHAND;
 }