[PATCH] SAK messages

[Denis Vlasenko]

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.
--
vda

--- linux-2.4.18/drivers/char/tty_io.c.orig	Fri Jan 25 15:49:44 2002
+++ new/drivers/char/tty_io.c	Tue Mar 19 08:28:27 2002
@@ -1847,6 +1847,9 @@
 	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;
 		}
@@ -1857,6 +1860,9 @@
 				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;
 				}