ref: 2e2a91f26b4724ae5f9942d545749a16b46c2a3f
dir: /sys/src/ape/lib/ap/stdio/atexit.c/
#include <unistd.h>
#define NONEXIT 34
extern int (*_atexitfns[NONEXIT])(void);
int
atexit(int (*f)(void))
{
int i;
for(i=0; i<NONEXIT; i++)
if(!_atexitfns[i]){
_atexitfns[i] = f;
return(0);
}
return(1);
}