Subversion Repositories planix.SVN

#include <u.h>

#include <libc.h>

void

reboot(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;

void

ding(void*, char*msg)

{

	if(strstr(msg, "alarm")){

		alarmed = 1;

		noted(NCONT);

	}

	noted(NDFLT);

}

void

main(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);

	}

}