/*  * This file is part of the UCB release of Plan 9. It is subject to the license * terms in the LICENSE file found in the top-level directory of this * distribution and at http://akaros.cs.berkeley.edu/files/Plan9License. No * part of the UCB release of Plan 9, including this file, may be copied, * modified, propagated, or distributed except according to the terms contained * in the LICENSE file. */ #include <u.h>#include <libc.h> voidreboot(void){	int fd;	fd = open("/dev/reboot", OWRITE);	if(fd >= 0)		write(fd, "reboot", 6);	exits(0);} char*readenv(char *name, char *buf, int n){	char *ans;	int f;	char ename[200]; 	ans = buf;	ename[0] = 0;	strcat(ename, "/env/");	strcat(ename, name);	f = open(ename, OREAD);	if(f < 0)		return 0;	n = read(f, ans, n-1);	if(n < 0)		ans = 0;	else		ans[n] = 0;	close(f);	return ans;} int alarmed; voidding(void*, char*msg){	if(strstr(msg, "alarm")){		alarmed = 1;		noted(NCONT);	}	noted(NDFLT);} voidmain(int argc, char **argv){	int fd;	char buf[256];	char file[128];	char *p;	Dir *d; 	if(argc > 1)		strecpy(file, file+sizeof file, argv[1]);	else{		p = readenv("cputype", buf, sizeof buf);		if(p == 0)			exits(0);		file[0] = 0;		strcat(file, "/");		strcat(file, p);		strcat(file, "/lib");	}	if (access(file, AREAD) < 0)		sysfatal("%s not readable: %r", file); 	switch(rfork(RFPROC|RFNOWAIT|RFNOTEG|RFCFDG)){	case 0:		break;	default:		exits(0);	} 	notify(ding);	fd = open(file, OREAD);	if (fd < 0)		exits("no file"); 	//  the logic here is to make a request every 5 minutes.	//  If the request alarms out, that's OK, the file server	//  may just be busy.  If the request fails for any other	//  reason, it's probably because the connection went	//  away so reboot.	for(;;){		alarm(1000*60);		alarmed = 0; 		d = dirfstat(fd);		free(d);		if(d == nil)			if(!alarmed)				reboot();		alarm(0);		sleep(60*1000*5);	}}