[PATCH] SAK messages

vda@port.imtp.ilyichevsk.odessa.ua: SAK messages:
  I use SAK from time to time when I have problems with hung processes.

  Sometimes it is difficult to figure out what was being killed and why.

  For example, Midnight Commander contains a bug: it holds fd#3 open to
  the tty. It prevented me from daemonizing processes (like X) - they
  died upon SAK.

  This little patch makes SAK tell whom and why it kills. Tested.

(Included in 2.4)

drivers/char/tty_io.c

@@ -1835,6 +1835,9 @@ static void __do_SAK(void *arg)
 	for_each_task(p) {
 		if ((p->tty == tty) ||
 		    ((session > 0) && (p->session == session))) {
+			printk(KERN_NOTICE "SAK: killed process %d"
+			    " (%s): p->session==tty->session\n",
+			    p->pid, p->comm);
 			send_sig(SIGKILL, p, 1);
 			continue;
 		}
@@ -1845,6 +1848,9 @@ static void __do_SAK(void *arg)
 				filp = fcheck_files(p->files, i);
 				if (filp && (filp->f_op == &tty_fops) &&
 				    (filp->private_data == tty)) {
+					printk(KERN_NOTICE "SAK: killed process %d"
+					    " (%s): fd#%d opened to the tty\n",
+					    p->pid, p->comm, i);
 					send_sig(SIGKILL, p, 1);
 					break;
 				}