diff options
Diffstat (limited to 'kernel/signal.c')
| -rw-r--r-- | kernel/signal.c | 29 |
1 files changed, 29 insertions, 0 deletions
diff --git a/kernel/signal.c b/kernel/signal.c index a6d8c3af0ad6..7d6ff8b18509 100644 --- 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(¤t->sighand->siglock); + /* This is only needed for daemonize()'ed kthreads */ + sigdelset(¤t->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(¤t->sighand->siglock); +} +EXPORT_SYMBOL(allow_signal); + +void disallow_signal(int sig) +{ + spin_lock_irq(¤t->sighand->siglock); + current->sighand->action[(sig)-1].sa.sa_handler = SIG_IGN; + recalc_sigpending(); + spin_unlock_irq(¤t->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; |