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signals: introduce kernel_sigaction()

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Now that allow_signal() is really trivial we can unify it with
disallow_signal().  Add the new helper, kernel_sigaction(), and
reimplement allow_signal/disallow_signal as a trivial wrappers.

This saves one EXPORT_SYMBOL() and the new helper can have more users.

Signed-off-by: Oleg Nesterov <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Al Viro <[email protected]>
Cc: David Woodhouse <[email protected]>
Cc: Frederic Weisbecker <[email protected]>
Cc: Geert Uytterhoeven <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: Mathieu Desnoyers <[email protected]>
Cc: Richard Weinberger <[email protected]>
Cc: Steven Rostedt <[email protected]>
Cc: Tejun Heo <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Oleg Nesterov 2014-06-06 14:37:00 -07:00 • committed by Linus Torvalds
commit b4e74264eb
2 changed files with 28 additions and 26 deletions
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40
kernel/signal.c
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@ -3067,37 +3067,25 @@ 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.
* For kthreads only, must not be used if cloned with CLONE_SIGHAND
*/
void allow_signal(int sig)
void kernel_sigaction(int sig, __sighandler_t action)
{
/*
* 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.
*/
spin_lock_irq(&current->sighand->siglock);
current->sighand->action[(sig)-1].sa.sa_handler = (void __user *)2;
current->sighand->action[sig - 1].sa.sa_handler = action;
if (action == SIG_IGN) {
sigset_t mask;
sigemptyset(&mask);
sigaddset(&mask, sig);
flush_sigqueue_mask(&mask, &current->signal->shared_pending);
flush_sigqueue_mask(&mask, &current->pending);
recalc_sigpending();
}
spin_unlock_irq(&current->sighand->siglock);
}
EXPORT_SYMBOL(allow_signal);
void disallow_signal(int sig)
{
sigset_t mask;
sigemptyset(&mask);
sigaddset(&mask, sig);
spin_lock_irq(&current->sighand->siglock);
current->sighand->action[(sig)-1].sa.sa_handler = SIG_IGN;
flush_sigqueue_mask(&mask, &current->signal->shared_pending);
flush_sigqueue_mask(&mask, &current->pending);
recalc_sigpending();
spin_unlock_irq(&current->sighand->siglock);
}
EXPORT_SYMBOL(disallow_signal);
EXPORT_SYMBOL(kernel_sigaction);
int do_sigaction(int sig, struct k_sigaction *act, struct k_sigaction *oact)
{