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