signals: mv {dis,}allow_signal() from sched.h/exit.c to signal.[ch]

[pandora-kernel.git] / kernel / signal.c

diff --git a/kernel/signal.c b/kernel/signal.c
index a6d8c3a..7d6ff8b 100644 (file)
--- a/kernel/signal.c
+++ b/kernel/signal.c
@@ -3066,6 +3066,35 @@ COMPAT_SYSCALL_DEFINE4(rt_tgsigqueueinfo,
 }
 #endif
 
+/*
+ * Let kernel threads use this to say that they allow a certain signal.
+ * Must not be used if kthread was cloned with CLONE_SIGHAND.
+ */
+void allow_signal(int sig)
+{
+       spin_lock_irq(&current->sighand->siglock);
+       /* This is only needed for daemonize()'ed kthreads */
+       sigdelset(&current->blocked, sig);
+       /*
+        * Kernel threads handle their own signals. Let the signal code
+        * know it'll be handled, so that they don't get converted to
+        * SIGKILL or just silently dropped.
+        */
+       current->sighand->action[(sig)-1].sa.sa_handler = (void __user *)2;
+       recalc_sigpending();
+       spin_unlock_irq(&current->sighand->siglock);
+}
+EXPORT_SYMBOL(allow_signal);
+
+void disallow_signal(int sig)
+{
+       spin_lock_irq(&current->sighand->siglock);
+       current->sighand->action[(sig)-1].sa.sa_handler = SIG_IGN;
+       recalc_sigpending();
+       spin_unlock_irq(&current->sighand->siglock);
+}
+EXPORT_SYMBOL(disallow_signal);
+
 int do_sigaction(int sig, struct k_sigaction *act, struct k_sigaction *oact)
 {
        struct task_struct *p = current, *t;