ref: ed0f4a4a51ad8c14419c98c43411bbdffb0346c6
dir: /src/libc/stdlib/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; }