[PATCH 1/3] signals: sigqueue_free: don't free sigqueue if it is queued
From: Oleg Nesterov
Date: Sat May 17 2008 - 11:15:47 EST
Currently sigqueue_free() removes sigqueue from list, but doesn't cancel the
pending signal. This is not consistent, the task should either receive the
"full" signal along with siginfo_t, or it shouldn't receive the signal at all.
Change sigqueue_free() to clear SIGQUEUE_PREALLOC but leave sigqueue on list
if it is queued.
This patch doesn't change the behaviour of sys_timer_delete() and friends,
just makes it more correct and allows us to introduce other SIGQUEUE_ flags
passed to the receiver.
Signed-off-by: Oleg Nesterov <oleg@xxxxxxxxxx>
--- 25/kernel/signal.c~4_SF_DONT_REMOVE 2008-05-17 16:22:07.000000000 +0400
+++ 25/kernel/signal.c 2008-05-17 17:14:04.000000000 +0400
@@ -1240,18 +1240,22 @@ void sigqueue_free(struct sigqueue *q)
BUG_ON(!(q->flags & SIGQUEUE_PREALLOC));
- * If the signal is still pending remove it from the
- * pending queue. We must hold ->siglock while testing
- * q->list to serialize with collect_signal() or with
+ * We must hold ->siglock while testing q->list
+ * to serialize with collect_signal() or with
+ q->flags &= ~SIGQUEUE_PREALLOC;
+ * If it is queued it will be freed when dequeued,
+ * like the "regular" sigqueue.
+ q = NULL;
- q->flags &= ~SIGQUEUE_PREALLOC;
+ if (q)
int send_sigqueue(struct sigqueue *q, struct task_struct *t, int group)
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/