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	atexit.c - 9base - revived minimalist port of Plan 9 userland to Unix
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	---
	atexit.c (746B)
	---
	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 }