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#include <u.h>
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#include <libc.h>
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#define	NEXIT	33
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typedef struct Onex Onex;
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struct Onex{
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	void	(*f)(void);
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	int	pid;
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};
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static Lock onexlock;
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Onex onex[NEXIT];
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int
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atexit(void (*f)(void))
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{
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	int i;
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	lock(&onexlock);
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	for(i=0; i<NEXIT; i++)
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		if(onex[i].f == 0) {
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			onex[i].pid = getpid();
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			onex[i].f = f;
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			unlock(&onexlock);
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			return 1;
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		}
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	unlock(&onexlock);
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	return 0;
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}
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void
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atexitdont(void (*f)(void))
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{
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	int i, pid;
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	pid = getpid();
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	for(i=0; i<NEXIT; i++)
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		if(onex[i].f == f && onex[i].pid == pid)
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			onex[i].f = 0;
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}
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#pragma profile off
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void
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exits(char *s)
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{
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	int i, pid;
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	void (*f)(void);
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	pid = getpid();
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	for(i = NEXIT-1; i >= 0; i--)
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		if((f = onex[i].f) && pid == onex[i].pid) {
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			onex[i].f = 0;
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			(*f)();
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		}
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	_exits(s);
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}
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#pragma profile on