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    Subject[PATCH] sigwait eats blocked default-ignore signals
    Date

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

    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.

    Signed-off-by: Roland McGrath <roland@redhat.com>
    ---
    kernel/signal.c | 2 +-
    1 files changed, 1 insertions(+), 1 deletions(-)

    diff --git a/kernel/signal.c b/kernel/signal.c
    index 0ac614a..9b22790 100644
    --- a/kernel/signal.c
    +++ b/kernel/signal.c
    @@ -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? */
    -
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