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sigwait eats blocked default-ignore signals

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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>
This commit is contained in:
Roland McGrath 2007-11-12 15:41:55 -08:00 committed by Linus Torvalds
parent 6fa02839bf
commit 325d22df7b
1 changed files with 1 additions and 1 deletions
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kernel/signal.c
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@ -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? */