ref: c35217a1a61f795d312eede2f84faf59c7c06a3c
dir: /lib/c/atexit.c/
#include <stdlib.h>
#include <errno.h>
#undef atexit
extern void (*_exitf[_ATEXIT_MAX])(void);
extern unsigned _exitn;
int
atexit(void (*fun)(void))
{
if (_exitn == _ATEXIT_MAX) {
errno = ENOMEM;
return -1;
}
_exitf[_exitn++] = fun;
return 0;
}