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       atexit.c - scc - simple c99 compiler
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       ---
       atexit.c (369B)
       ---
            1 #include <stdlib.h>
            2 #include <errno.h>
            3 
            4 #include "../libc.h"
            5 
            6 #undef atexit
            7 
            8 static void (*funs[_ATEXIT_MAX])(void);
            9 static unsigned nfuns;
           10 
           11 static void
           12 callhdls(void)
           13 {
           14         while (nfuns > 0)
           15                 (*funs[--nfuns])();
           16 }
           17 
           18 int
           19 atexit(void (*fun)(void))
           20 {
           21         if (nfuns == _ATEXIT_MAX) {
           22                 errno = ENOMEM;
           23                 return -1;
           24         }
           25         funs[nfuns++] = fun;
           26         _atexithdl = callhdls;
           27 
           28         return 0;
           29 }