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# ROCK Linux: rock-src/package/base/util-linux/sak_blocking.patch
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--- ./login-utils/agetty.c.orig	Sun Mar  4 21:43:50 2001
+++ ./login-utils/agetty.c	Wed Mar 21 10:17:47 2001
@@ -231,10 +231,14 @@
 int bcode P_((char *s));
 void usage P_((void));
 void error P_((const char *, ...));
+void sak_blocking P_((int signr));
 #undef P_
 
 /* The following is used for understandable diagnostics. */
 
+/* message file for SAK blocking */
+char *sakmsg="/dev/null";
+
 char *progname;
 
 /* Fake hostname for ut_host specified on command line. */
@@ -393,7 +397,7 @@
     extern int optind;			/* getopt */
     int     c;
 
-    while (isascii(c = getopt(argc, argv, "I:LH:f:hil:mt:wn"))) {
+    while (isascii(c = getopt(argc, argv, "I:LH:f:hil:mt:s:wn"))) {
 	switch (c) {
 	case 'I':
 	    if (!(op->initstring = malloc(strlen(optarg)))) {
@@ -464,6 +468,10 @@
 	    if ((op->timeout = atoi(optarg)) <= 0)
 		error(_("bad timeout value: %s"), optarg);
 	    break;
+	case 's':				/* SAK blocking after time out */
+	    signal(SIGALRM,sak_blocking);
+	    sakmsg = optarg;
+	    break;
 	case 'w':
 	    op->flags |= F_WAITCRLF;
 	    break;
@@ -1251,4 +1259,26 @@
 #endif
     (void) sleep((unsigned) 10);		/* be kind to init(8) */
     exit(1);
+}
+
+/* signal handler for alarm() timeout when doing SAK blocking */
+
+void sak_blocking(int signr) {
+	char buf[512];
+	int fd,rc,i;
+	
+	if (signr != SIGALRM) return;
+	alarm(0);
+	
+	/* print the SAK Message */
+	fd=open(sakmsg,O_RDONLY);
+	if (fd >= 0) {
+		while ( (rc=read(fd,buf,512)) > 0 )
+			write(1,buf,rc);
+		close(fd);
+	}
+	
+	/* lock */
+	for (i=1; i<=30; i++) signal(i,SIG_IGN);
+	while (1) sleep(600);
 }