Commit 325d22df authored Nov 12, 2007 by Roland McGrath Committed by Linus Torvalds Nov 12, 2007

sigwait eats blocked default-ignore signals

While a signal is blocked, it must be posted even if its action is
SIG_IGN or is SIG_DFL with the default action to ignore.  This works
right most of the time, but is broken when a sigwait (rt_sigtimedwait)
is in progress.  This changes the early-discard check to respect
real_blocked.  ~blocked is the set to check for "should wake up now",
but ~(blocked|real_blocked) is the set for "blocked" semantics as
defined by POSIX.

This fixes bugzilla entry 9347, see

	http://bugzilla.kernel.org/show_bug.cgi?id=9347



Signed-off-by: Roland McGrath <roland@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

parent 6fa02839

kernel/signal.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -55,7 +55,7 @@ static int sig_ignored(struct task_struct *t, int sig)
		* signal handler may change by the time it is
		* unblocked.
		*/
		if (sigismember(&t->blocked, sig))
		if (sigismember(&t->blocked, sig) \|\| sigismember(&t->real_blocked, sig))
		return 0;

		/* Is it explicitly or implicitly ignored? */

Admin message