ref: 03eeebb97f014c29a4dd25d873fc6ad50da48f15
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); }