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#include "stddef.h" // for NULL
#include <stdlib.h> // for atexit
static void (*__atexit_fvec[32])(void) = { NULL };
int atexit(void (*func)(void))
{
for (int i = 0; i < 32; i++) {
if (__atexit_fvec[i] == NULL) {
__atexit_fvec[i] = func;
__atexit_fvec[i + 1] = NULL;
return 0;
}
}
return -1;
}
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