#include <u.h>#include <libc.h> u64int jenkinshash(char *key, int len){	u64int hash, i;	for(hash = i = 0; i < len; ++i){		hash += key[i];		hash += (hash << 10);		hash ^= (hash >> 6);	}	hash += (hash << 3);	hash ^= (hash >> 11);	hash += (hash << 15);	return hash;} static voidfwrites(char *f, char *s){	int fd;	fd = open(f, OWRITE);	if(fd > 0){		write(fd, s, strlen(s));		close(fd);	}} voidriolabel(char *label){	fwrites("/dev/label", label);} voidrioclose(void){	fwrites("/dev/wctl", "delete");} /* copied from /sys/src/libdraw/newwindow.c to avoid linking in libdraw. */intriowindow(char *str){	int fd;	char *wsys;	char buf[256]; 	wsys = getenv("wsys");	if(wsys == nil)		return -1;	fd = open(wsys, ORDWR);	if(fd < 0){		free(wsys);		return -1;	}	rfork(RFNAMEG);	unmount(wsys, "/dev");	/* drop reference to old window */	free(wsys);	if(str)		snprint(buf, sizeof buf, "new %s", str);	else		strcpy(buf, "new");	if(mount(fd, -1, "/mnt/wsys", MREPL, buf) < 0)		return mount(fd, -1, "/dev", MBEFORE, buf);	return bind("/mnt/wsys", "/dev", MBEFORE);}