#include <u.h>#include <libc.h>#include <auth.h> intauth_getkey(char *params){	Dir *d;	int pid;	Waitmsg *w; 	/* start /factotum to query for a key */	d = dirstat("/factotum");	if(d == nil){		werrstr("auth_getkey: no /factotum: didn't get key %s", params);		return -1;	}if(0)	if(d->type != '/'){		werrstr("auth_getkey: /factotum may be bad: didn't get key %s", params);		return -1;	}	switch(pid = fork()){	case -1:		werrstr("can't start /factotum: %r");		return -1;	case 0:		execl("/factotum", "getkey", "-g", params, nil);		exits(0);	default:		for(;;){			w = wait();			if(w == nil)				break;			if(w->pid == pid){				if(w->msg[0] != '\0'){					free(w);					return -1;				}				free(w);				return 0;			}		}	}	return 0;}