G'day Jeff & list,
I've been playing with virtual networks of UML hosts, and
one thing that's been annoying me is that it's difficult to shut
the network down cleanly. Here's a patch which catches a SIGHUP
to the tracing thread and calls the kernel ctrl_alt_del() procedure.
If I'm doing this a totally bone-headed way, I'm sure
you'll let me know ... hey, I said it was trivial!
-----sharks
-----8<-----cut here-----8<-----
Based on 2.4.16-2
diff -c trap_kern.orig.c trap_kern.c
*** trap_kern.orig.c Thu Feb 21 17:40:46 2002
--- trap_kern.c Thu Feb 21 17:42:24 2002
***************
*** 274,279 ****
--- 274,286 ----
init_proxy(debugger_pid, 0, 0);
}
+ void signal_hup(int sig)
+ {
+ printk(KERN_ERR "Tracing thread caught SIGHUP: simulating ctrl-alt-del\n");
+ /* do I have to do anything clever here? */
+ ctrl_alt_del();
+ }
+
int init_ptrace_proxy(int idle_pid, int startup, int stop)
{
int pid, status;
diff -c trap_user.orig.c trap_user.c
*** trap_user.orig.c Thu Feb 21 17:40:34 2002
--- trap_user.c Thu Feb 21 17:46:30 2002
***************
*** 114,119 ****
--- 114,120 ----
extern int io_nsignals, io_count, intr_count;
extern void signal_usr1(int sig);
+ extern void signal_hup(int sig);
int tracing_pid = -1;
***************
*** 129,134 ****
--- 130,136 ----
calc_sigframe_size();
signal(SIGSEGV, signal_segv);
signal(SIGUSR1, signal_usr1);
+ signal(SIGHUP, signal_hup);
signal(SIGPIPE, SIG_IGN);
tracing_pid = getpid();
printk("tracing thread pid = %d\n", tracing_pid);
-----8<-----cut here-----8<-----
--
Nick 'Sharkey' Moore <Nic...@en...>
Research Fellow, CTIE Tel: +61 3 9905 3707
Monash University, Australia Fax: +61 3 9905 5358
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