pass task_struct in send_signal()

Update send_signal() api to allow passing the task receiving the signal.
This is necessary to ensure signals generated out of process context can
be charged to the correct user.

===== kernel/signal.c 1.115 vs edited =====
--- 1.115/kernel/signal.c	Mon May 10 03:04:00 2004
+++ edited/kernel/signal.c	Mon May 10 16:16:13 2004
@@ -698,7 +698,8 @@
 	}
 }
 
-static int send_signal(int sig, struct siginfo *info, struct sigpending *signals)
+static int send_signal(int sig, struct siginfo *info, struct task_struct *t,
+			struct sigpending *signals)
 {
 	struct sigqueue * q = NULL;
 	int ret = 0;
@@ -797,7 +798,7 @@
 	if (LEGACY_QUEUE(&t->pending, sig))
 		goto out;
 
-	ret = send_signal(sig, info, &t->pending);
+	ret = send_signal(sig, info, t, &t->pending);
 	if (!ret && !sigismember(&t->blocked, sig))
 		signal_wake_up(t, sig == SIGKILL);
 out:
@@ -998,7 +999,7 @@
 	 * We always use the shared queue for process-wide signals,
 	 * to avoid several races.
 	 */
-	ret = send_signal(sig, info, &p->signal->shared_pending);
+	ret = send_signal(sig, info, p, &p->signal->shared_pending);
 	if (unlikely(ret))
 		return ret;
 

-
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