scc

simple c99 compiler
git clone git://git.simple-cc.org/scc
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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 }