1 fd04aace 2003-11-23 devnull #include <u.h>
 2 fd04aace 2003-11-23 devnull #include <libc.h>
 3 fd04aace 2003-11-23 devnull 
 4 fd04aace 2003-11-23 devnull #define	NFN	33
 5 fd04aace 2003-11-23 devnull static	int	(*onnot[NFN])(void*, char*);
 6 fd04aace 2003-11-23 devnull static	Lock	onnotlock;
 7 fd04aace 2003-11-23 devnull 
 8 fd04aace 2003-11-23 devnull static
 9 fd04aace 2003-11-23 devnull void
10 fd04aace 2003-11-23 devnull notifier(void *v, char *s)
11 fd04aace 2003-11-23 devnull {
12 fd04aace 2003-11-23 devnull 	int i;
13 fd04aace 2003-11-23 devnull 
14 fd04aace 2003-11-23 devnull 	for(i=0; i<NFN; i++)
15 fd04aace 2003-11-23 devnull 		if(onnot[i] && ((*onnot[i])(v, s))){
16 fd04aace 2003-11-23 devnull 			noted(NCONT);
17 fd04aace 2003-11-23 devnull 			return;
18 fd04aace 2003-11-23 devnull 		}
19 fd04aace 2003-11-23 devnull 	noted(NDFLT);
20 fd04aace 2003-11-23 devnull }
21 fd04aace 2003-11-23 devnull 
22 fd04aace 2003-11-23 devnull int
23 fd04aace 2003-11-23 devnull atnotify(int (*f)(void*, char*), int in)
24 fd04aace 2003-11-23 devnull {
25 fd04aace 2003-11-23 devnull 	int i, n, ret;
26 fd04aace 2003-11-23 devnull 	static int init;
27 fd04aace 2003-11-23 devnull 
28 fd04aace 2003-11-23 devnull 	if(!init){
29 fd04aace 2003-11-23 devnull 		notify(notifier);
30 fd04aace 2003-11-23 devnull 		init = 1;		/* assign = */
31 fd04aace 2003-11-23 devnull 	}
32 fd04aace 2003-11-23 devnull 	ret = 0;
33 fd04aace 2003-11-23 devnull 	lock(&onnotlock);
34 fd04aace 2003-11-23 devnull 	if(in){
35 fd04aace 2003-11-23 devnull 		for(i=0; i<NFN; i++)
36 fd04aace 2003-11-23 devnull 			if(onnot[i] == 0) {
37 fd04aace 2003-11-23 devnull 				onnot[i] = f;
38 fd04aace 2003-11-23 devnull 				ret = 1;
39 fd04aace 2003-11-23 devnull 				break;
40 fd04aace 2003-11-23 devnull 			}
41 fd04aace 2003-11-23 devnull 	}else{
42 fd04aace 2003-11-23 devnull 		n = 0;
43 fd04aace 2003-11-23 devnull 		for(i=0; i<NFN; i++)
44 fd04aace 2003-11-23 devnull 			if(onnot[i]){
45 fd04aace 2003-11-23 devnull 				if(ret==0 && onnot[i]==f){
46 fd04aace 2003-11-23 devnull 					onnot[i] = 0;
47 fd04aace 2003-11-23 devnull 					ret = 1;
48 fd04aace 2003-11-23 devnull 				}else
49 fd04aace 2003-11-23 devnull 					n++;
50 fd04aace 2003-11-23 devnull 			}
51 fd04aace 2003-11-23 devnull 		if(n == 0){
52 fd04aace 2003-11-23 devnull 			init = 0;
53 fd04aace 2003-11-23 devnull 			notify(0);
54 fd04aace 2003-11-23 devnull 		}
55 fd04aace 2003-11-23 devnull 	}
56 fd04aace 2003-11-23 devnull 	unlock(&onnotlock);
57 fd04aace 2003-11-23 devnull 	return ret;
58 fd04aace 2003-11-23 devnull }