#include <u.h>#include <libc.h>#include <draw.h> /* Connect us to new window, if possible */intnewwindow(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) == -1){		if(mount(fd, -1, "/dev", MBEFORE, buf) == -1){			close(fd);			return -1;		}	} else {		if(bind("/mnt/wsys", "/dev", MBEFORE) == -1)			return -1;	}	return 0;}