1 #include <u.h>
2 #include <libc.h>
3 
4 #define	NEXIT	33
5 
6 static Lock onexlock;
7 static struct
8 {
9 	void	(*f)(void);
10 	int	pid;
11 }onex[NEXIT];
12 
13 int
14 atexit(void (*f)(void))
15 {
16 	int i;
17 
18 	lock(&onexlock);
19 	for(i=0; i<NEXIT; i++)
20 		if(onex[i].f == 0) {
21 			onex[i].pid = getpid();
22 			onex[i].f = f;
23 			unlock(&onexlock);
24 			return 1;
25 		}
26 	unlock(&onexlock);
27 	return 0;
28 }
29 
30 void
31 atexitdont(void (*f)(void))
32 {
33 	int i, pid;
34 
35 	pid = getpid();
36 	for(i=0; i<NEXIT; i++)
37 		if(onex[i].f == f && onex[i].pid == pid)
38 			onex[i].f = 0;
39 }
40 
41 void
42 exits(char *s)
43 {
44 	int i, pid;
45 	void (*f)(void);
46 
47 	pid = getpid();
48 	for(i = NEXIT-1; i >= 0; i--)
49 		if((f = onex[i].f) && pid == onex[i].pid) {
50 			onex[i].f = 0;
51 			(*f)();
52 		}
53 	if(s == 0 || *s == 0)
54 		exit(0);
55 	exit(exitcode(s));
56 }