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From: schlut@oski.toppoint.de (Olaf Schlueter)
Newsgroups: comp.os.minix
Subject: System shutdown using init
Message-ID: <34@oski.toppoint.de>
Date: 21 Apr 91 18:16:18 GMT
Lines: 38


Included is a signal handler routine for init, which may be used to stop
minix the safe way.  I put it and a signal(SIGTERM, shutdown) into init. 
Now I can safely stop the system by typing

kill 1

as root from any tty.

--------------------------------------------------------------------
main()	/* of init */
{
   void shutdown();
   ...
   signal(SIGTERM, shutdown);	/* before entering main loop */
   ...
}

...

void shutdown()
{
   int pid, status, fd;
   
   signal(SIGTERM, SIG_IGN);  	/* do not commit suicide */
   kill(-1,SIGTERM);		/* be gentle first */
   kill(-1,SIGKILL);		/* and brutal later */
   while((pid = wait(&status)) > 0);	
   sync();
   fd = open(CONSOLE,1);
   write(fd, "\nIt is now safe to turn the system off.\n", 40);
   while(1);
}
   
----------------------------------------------------------------
-- 
-- 
Olaf Schlueter, Sandkuhle 4-6, 2300 Kiel 1, Germany, Toppoint Mailbox e.V.
schlut@oski.toppoint.de, olaf@tpki.toppoint.de, ...!unido!tpki!olaf